CAP1296-2-SL-TR_技术文档

CAP1296

6-Channel Capacitive Touch Sensor with Proximity

Detection & Signal Guard

General Description

Applications

The CAP1296 is a multiple channel capacitive touch

sensor controller. It contains six (6) individual capaci-

tive touch sensor inputs with programmable sensitivity

for use in touch sensor applications. Each sensor input

is calibrated to compensate for system parasitic capac-

itance and automatically recalibrated to compensate

for gradual environmental changes.

• Desktop and Notebook PCs

• LCD Monitors

• Consumer Electronics

• Appliances

Features

In addition, the CAP1296 can be configured to detect

proximity on one or more channels with an optional sig-

nal guard to reduce noise sensitivity and to isolate the

proximity antenna from nearby conductive surfaces

that would otherwise attenuate the e-field.

• Six (6) Capacitive Touch Sensor Inputs

- Programmable sensitivity

- Automatic recalibration

- Calibrates for parasitic capacitance

- Individual thresholds for each button

• Proximity Detection

The CAP1296 includes Multiple Pattern Touch recogni-

tion that allows the user to select a specific set of but-

tons to be touched simultaneously. If this pattern is

detected, a status bit is set and an interrupt is gener-

ated.

• Signal Guard

- Isolates the proximity antenna from attenua-

tion

- Reduces system noise sensitivity effects on

inputs

The CAP1296 has Active and Standby states, each

with its own sensor input configuration controls. The

Combo state allows a combination of sensor input con-

trols to be used which enables one or more sensor

inputs to operate as buttons while another sensor input

is operating as a proximity detector. Power consump-

tion in the Standby and Combo states is dependent on

the number of sensor inputs enabled as well as averag-

ing, sampling time, and cycle time. Deep Sleep is the

lowest power state available, drawing 5µA (typical) of

current. In this state, no sensor inputs are active, and

communications will wake the device.

• Multiple Button Pattern Detection

• Power Button Support

• Press and Hold Feature for Volume-like Applica-

tions

• 3.3V or 5V Supply

• Analog Filtering for System Noise Sources

• RF Detection and Avoidance Filters

• Digital EMI Blocker

• 8kV ESD Rating on All Pins (HBM)

• Low Power Operation

- 5µA quiescent current in Deep Sleep

- 50µA quiescent current in Standby (1 sensor

input monitored)

- Samples one or more channels in Standby

• SMBus / I²C Compliant Communication Interface

• Available in a 10-pin 3mm x 3mm DFN RoHS

compliant package

 2013-2015 Microchip Technology Inc.

DS00001569B-page 1

CAP1296

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The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).

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DS00001569B-page 2

 2013-2015 Microchip Technology Inc.

CAP1296

Table of Contents

1.0 Introduction ..................................................................................................................................................................................... 4

2.0 Pin Description and Configuration .................................................................................................................................................. 8

3.0 Functional Description .................................................................................................................................................................. 21

4.0 Register Descriptions .................................................................................................................................................................... 58

5.0 Operational Characteristics ........................................................................................................................................................... 69

6.0 Package Outline ............................................................................................................................................................................ 85

Appendix A: Data Sheet Revision History ........................................................................................................................................... 91

The Microchip Web Site ...................................................................................................................................................................... 93

Customer Change Notification Service ............................................................................................................................................... 93

Customer Support ............................................................................................................................................................................... 93

Product Identification System ............................................................................................................................................................. 94

 2013-2015 Microchip Technology Inc.

DS00001569B-page 3

CAP1296

1.0

1.1

INTRODUCTION

Block Diagram

FIGURE 1-1:

CAP1296 BLOCK DIAGRAM

VDD

GND

SMCLK

CS3 /

SG

Capacitive Touch Sensing

Algorithm

SMBus

Protocol

SMDATA

ALERT#

CS1 CS2 CS4 CS5 CS6

1.2

Pin Diagrams

FIGURE 1-2:

CAP1296 14-PIN SOIC

N/C

CS1

1

2

3

N/C

13 CS2

14

ALERT#

SMDAT

SMCLK

N/C

12

11

10

9

CS3/SG

CS4

CS5

CS6

GND

4

5

6

7

VDD

8

DS00001569B-page 4

 2013-2015 Microchip Technology Inc.

CAP1296

FIGURE 1-3:

CAP1296 PIN DIAGRAM (10-PIN 3 X 3 MM DFN)

CS1

ALERT#

SMDATA

SMCLK

VDD

1

2

3

4

5

10 CS2

9

8

7

6

CS3 / SG

GND

CS4

CS5

CS6

TABLE 1-1:

PIN DESCRIPTION FOR CAP1296

Unused

Connection

QFN Pin # SOIC Pin #

Pin Name

Pin Function

Pin Type

Capacitive Touch Sensor Input 1

Connect to

Ground

1

2

3

CS1

AIO

OD

ALERT# - Active low alert / interrupt out-

put for SMBus alert - requires pull-up

resistor (default)

Connect to

Ground

ALERT#

SMDATA

SMDATA - Bi-directional, open-drain

SMBus or I²C data - requires pull-up

resistor

3

4

DIOD

n/a

SMCLK - SMBus or I²C clock input -

requires pull-up resistor

4

5

6

5

7

9

SMCLK

VDD

DI

n/a

Positive Power supply

Power

AIO

Capacitive Touch Sensor Input 6

Connect to

Ground

CS6

Capacitive Touch Sensor Input 5

Capacitive Touch Sensor Input 4

CS3 - Capacitive Touch Sensor Input 3

Connect to

Ground

7

8

10

11

CS5

CS4

AIO

Connect to

Ground

Connect to

Ground

12

13

AIO

9

CS3 / SG

SG - Signal guard output

Leave Open

Capacitive Touch Sensor Input 2

Connect to

Ground

10

CS2

Bottom

Pad

Ground

8

GND

Power

n/a

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DS00001569B-page 5

CAP1296

1.3

Pin Description

APPLICATION NOTE: All digital pins are 5V tolerant pins.

The pin types are described in Table 1-2, "Pin Types".

TABLE 1-2:

Pin Type

PIN TYPES

Description

Power

DI

This pin is used to supply power or ground to the device.

Digital Input - This pin is used as a digital input. This pin is 5V tolerant.

Analog Input / Output - This pin is used as an I/O for analog signals.

AIO

Digital Input / Open Drain Output - This pin is used as a digital I/O. When it is used as an

output, it is open drain and requires a pull-up resistor. This pin is 5V tolerant.

DIOD

OD

Open Drain Digital Output - This pin is used as a digital output. It is open drain and requires

a pull-up resistor. This pin is 5V tolerant.

DS00001569B-page 6

 2013-2015 Microchip Technology Inc.

CAP1296

2.0

ELECTRICAL SPECIFICATIONS

TABLE 2-1:

ABSOLUTE MAXIMUM RATINGS

Voltage on VDD pin

-0.3 to 6.5

-0.3 to 4.0

-0.3 to 5.5

0 to 3.6

+10

V

Voltage on CS pins to GND

Voltage on 5V tolerant pins (V_{5VT_PIN}

V

)

V

Voltage on 5V tolerant pins (|V_{5VT_PIN}- V_DD|) (see Note 2-2)

Input current to any pin except VDD

V

mA

N/A

W

Output short circuit current

Continuous

0.5

Package Power Dissipation up to T_A= 85°C for 10-pin DFN

(see Note 2-3)

Junction to Ambient (_JA) (see Note 2-4)

Operating Ambient Temperature Range

Storage Temperature Range

78

°C/W

°C

-40 to 125

-55 to 150

8000

°C

ESD Rating, All Pins, HBM

V

Note 2-1

Stresses above those listed could cause permanent damage to the device. This is a stress rating

only and functional operation of the device at any other condition above those indicated in the

operation sections of this specification is not implied.

Note 2-2

Note 2-3

For the 5V tolerant pins that have a pull-up resistor, the voltage difference between V_{5VT_PIN}and V_DD

must never exceed 3.6V.

The Package Power Dissipation specification assumes a recommended thermal via design consisting

of a 2x3 matrix of 0.3mm (12mil) vias at 0.9mm pitch connected to the ground plane with a 1.6 x

2.3mm thermal landing.

Note 2-4

Junction to Ambient (_JA) is dependent on the design of the thermal vias. Without thermal vias and

a thermal landing, the _JAwill be higher.

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DS00001569B-page 7

CAP1296

TABLE 2-2:

ELECTRICAL SPECIFICATIONS

V_DD= 3V to 5.5V, T_A= 0°C to 85°C, all Typical values at T_A= 25°C unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

Conditions

DC Power

Supply Voltage

Supply Current

V_DD

3.0

5.5

V

Standby state active

1 sensor input monitored

Default conditions (8 avg, 70ms

cycle time)

I_{STBY_DEF}

120

50

170

µA

Standby state active

1 sensor input monitored

1 avg, 140ms cycle time

I_{STBY_LP}

µA

Deep Sleep state active

No communications

T_A< 40°C

I_{DSLEEP_3V}

5

TBD

750

µA

3.135 < V_DD< 3.465V

Capacitive Sensing Active

signal guard disabled

I_DD

500

Capacitive Touch Sensor Inputs

Maximum Base

Capacitance

C_BASE

50

pF

Pad untouched

MinimumDetectable

Capacitive Shift

C_TOUCH

20

fF

Pad touched - default conditions

Pad touched - Not tested

Recommended Cap

Shift

0.1

2

pF

Untouched Current Counts

Base Capacitance 5pF - 50pF

Negative Delta Counts disabled

Maximum sensitivity

Power Supply

Rejection

counts

/ V

PSR

±3

±10

All other parameters default

Power-On and Brown-out Reset (see Section 4.2, "Reset")

Power-On Reset

Voltage

V_POR

1

1.3

V

Pin States Defined

Power-On Reset

Release Voltage

Rising V_DD

Ensured by design

V_PORR

V_BOR

2.85

2.8

V

Brown-Out Reset

Falling V_DD

VDD Rise Rate

(ensures internal

POR signal)

SV_DD

0.05

V/ms

0 to 3V in 60ms

Power-Up Timer

Period

t_PWRT

10

ms

µs

Brown-Out Reset

Voltage Delay

t_BORDC

1

V_DD= V_BOR- 1

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CAP1296

TABLE 2-2:

ELECTRICAL SPECIFICATIONS (CONTINUED)

V_DD= 3V to 5.5V, T_A= 0°C to 85°C, all Typical values at T_A= 25°C unless otherwise noted.

Characteristic

Symbol

Min

Typ

Timing

Max

Unit

Conditions

Time to

Communications

Ready

t_{COMM_DLY}

15

ms

Time to First

Conversion Ready

t_{CONV_DLY}

170

200

I/O Pins

Output Low Voltage

Output High Voltage

V_OL

V_OH

0.4

V

I_{SINK_IO}= 8mA

V_DD

0.4

-

I_{SOURCE_IO}= 8mA

Input High Voltage

Input Low Voltage

V_IH

V_IL

2.0

V

0.8

±5

powered or unpowered

T_A< 85°C

pull-up voltage < 3.6V if

unpowered

Leakage Current

I_LEAK

µA

pF

SG Pin

Capacitive Drive

Capability

C_{BASE_SG}

20

200

capacitance to ground

SMBus Timing

Input Capacitance

Clock Frequency

Spike Suppression

C_IN

f_SMB

t_SP

5

pF

kHz

ns

10

400

50

Bus Free Time Stop

to Start

t_BUF

1.3

µs

Start Setup Time

Start Hold Time

Stop Setup Time

Data Hold Time

Data Setup Time

Clock Low Period

Clock High Period

t_SU:STA

t_HD:STA

t_SU:STO

t_HD:DAT

t_SU:DAT

t_LOW

0.6

0

µs

When transmitting to the master

When receiving from the master

0.3

0.6

1.3

0.6

t_HIGH

Clock / Data Fall

Time

t_FALL

300

ns

Min = 20+0.1C_LOADns

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DS00001569B-page 9

CAP1296

TABLE 2-2:

ELECTRICAL SPECIFICATIONS (CONTINUED)

V_DD= 3V to 5.5V, T_A= 0°C to 85°C, all Typical values at T_A= 25°C unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

Conditions

Clock / Data Rise

Time

t_RISE

300

400

ns

pF

Min = 20+0.1C_LOADns

per bus line

Capacitive Load

C_LOAD

DS00001569B-page 10

 2013-2015 Microchip Technology Inc.

CAP1296

3.0

3.1

COMMUNICATIONS

Communications

The CAP1296 communicates using the SMBus or I²C protocol.

3.2

System Management Bus

The CAP1296 communicates with a host controller, such as an MCHP SIO, through the SMBus. The SMBus is a two-

wire serial communication protocol between a computer host and its peripheral devices. A detailed timing diagram is

shown in Figure 3-1. Stretching of the SMCLK signal is supported; however, the CAP1296 will not stretch the clock sig-

nal.

FIGURE 3-1:

SMBUS TIMING DIAGRAM

T

SU:STO

LOW

HIGH

HD:STA

T

FALL

SMCLK

T

RISE

T

SU:DAT

SU:STA

T

HD:DAT

T

HD:STA

SMDATA

T_BUF

S

P

S - Start Condition

P - Stop Condition

3.2.1

SMBUS START BIT

The SMBus Start bit is defined as a transition of the SMBus Data line from a logic ‘1’ state to a logic ‘0’ state while the

SMBus Clock line is in a logic ‘1’ state.

3.2.2

SMBUS ADDRESS AND RD / WR BIT

The SMBus Address Byte consists of the 7-bit client address followed by the RD / WR indicator bit. If this RD / WR bit

is a logic ‘0’, then the SMBus Host is writing data to the client device. If this RD / WR bit is a logic ‘1’, then the SMBus

Host is reading data from the client device.

3.2.3

The CAP1296responds to SMBus address 0101_000(r/w). SMBUS DATA BYTES

All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information.

3.2.4

SMBUS ACK AND NACK BITS

The SMBus client will acknowledge all data bytes that it receives. This is done by the client device pulling the SMBus

Data line low after the 8th bit of each byte that is transmitted. This applies to both the Write Byte and Block Write proto-

cols.

The Host will NACK (not acknowledge) the last data byte to be received from the client by holding the SMBus data line

high after the 8th data bit has been sent. For the Block Read protocol, the Host will ACK each data byte that it receives

except the last data byte.

3.2.5

SMBUS STOP BIT

The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic ‘1’ state while the

SMBus clock line is in a logic ‘1’ state. When the CAP1296 detects an SMBus Stop bit and it has been communicating

with the SMBus protocol, it will reset its client interface and prepare to receive further communications.

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DS00001569B-page 11

CAP1296

3.2.6

SMBUS TIMEOUT

The CAP1296 includes an SMBus timeout feature. Following a 30ms period of inactivity on the SMBus where the

SMCLK pin is held low, the device will timeout and reset the SMBus interface.

The timeout function defaults to disabled. It can be enabled by setting the TIMEOUT bit in the Configuration register

(see Section 5.6, "Configuration Registers").

2

3.2.7

SMBUS AND I C COMPATIBILITY

The major differences between SMBus and I²C devices are highlighted here. For more information, refer to the SMBus

2.0 specification.

1. CAP1296supports I²C fast mode at 400kHz. This covers the SMBus max time of 100kHz.

2. Minimum frequency for SMBus communications is 10kHz.

3. The SMBus client protocol will reset if the clock is held low longer than 30ms (timeout condition). This can be

enabled in the CAP1296 by setting the TIMEOUT bit in the Configuration register. I²C does not have a timeout.

4. The SMBus client protocol will reset if both the clock and the data line are high for longer than 200us (idle con-

dition). This can be enabled in the CAP1296by setting the TIMEOUT bit in the Configuration register. I²C does

not have an idle condition.

5. I²C devices do not support the Alert Response Address functionality (which is optional for SMBus).

6. I²C devices support block read and write differently. I²C protocol allows for unlimited number of bytes to be sent

in either direction. The SMBus protocol requires that an additional data byte indicating number of bytes to read /

write is transmitted. The CAP1296 supports I²C formatting only.

3.3

SMBus Protocols

The CAP1296 is SMBus 2.0 compatible and supports Write Byte, Read Byte, Send Byte, and Receive Byte as valid

protocols as shown below.

All of the below protocols use the convention in Table 3-1.

TABLE 3-1:

PROTOCOL FORMAT

Data Sent to

Device

Data Sent to the

HOst

Data sent

3.3.1

SMBUS WRITE BYTE

The Write Byte is used to write one byte of data to a specific register as shown in Table 3-2.

TABLE 3-2:

WRITE BYTE PROTOCOL

Slave

Register

Address

Register

Data

Start

WR

ACK

Stop

Address

1 ->0

0101_000

0

XXh

0

XXh

0

0 -> 1

3.3.2

SMBUS READ BYTE

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3-3.

DS00001569B-page 12

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CAP1296

TABLE 3-3:

READ BYTE PROTOCOL

Start

Slave Address

WR

ACK

Register

Address

ACK

Start

Client Address

RD

ACK

Register

Data

NACK

Stop

1->0

0

XXh

0

1 ->0

0101_000

1

0

XXh

1

0 -> 1

0101_000

3.3.3

SMBUS SEND BYTE

The Send Byte protocol is used to set the internal address register pointer to the correct address location. No data is

transferred during the Send Byte protocol as shown in Table 3-4.

APPLICATION NOTE: The Send Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).

TABLE 3-4:

SEND BYTE PROTOCOL

Start

Slave Address

WR

ACK

Register Address

ACK

Stop

1 -> 0

0101_000

0

XXh

0

0 -> 1

3.3.4

SMBUS RECEIVE BYTE

The Receive Byte protocol is used to read data from a register when the internal register address pointer is known to

be at the right location (e.g. set via Send Byte). This is used for consecutive reads of the same register as shown in

Table 3-5.

APPLICATION NOTE: The Receive Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).

TABLE 3-5:

RECEIVE BYTE PROTOCOL

Start

Slave Address

RD

ACK

Register Data

NACK

Stop

1 -> 0

0101_000

1

0

XXh

1

0 -> 1

3.4

I²C Protocols

The CAP1296 supports I²C Block Read and Block Write.

The protocols listed below use the convention in Table 3-1.

3.4.1

BLOCK READ

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in Table 3-6.

APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

TABLE 3-6:

BLOCK READ PROTOCOL

Start

Slave

Address

WR

ACK

Register

Address

ACK

Start

Slave Address

RD

ACK

Register Data

1->0

0101_000

0

XXh

0

1 ->0

0101_000

1

0

XXh

ACK

REGISTER

DATA

ACK

REGISTER

DATA

ACK

REGISTER

DATA

ACK

. . .

REGISTER

DATA

NACK

STOP

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DS00001569B-page 13

CAP1296

TABLE 3-6:

BLOCK READ PROTOCOL

0

XXh

0

XXh

0

XXh

0

. . .

XXh

1

0 -> 1

3.4.2

BLOCK WRITE

The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in Table 3-7.

APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

TABLE 3-7:

BLOCK WRITE PROTOCOL

Slave

Register

Address

Register

Data

Start

Address

WR

ACK

1 ->0

0101_000

0

XXh

0

XXh

0

Register

Data

Register

Data

Register

Data

ACK

. . .

ACK

Stop

XXh

0

XXh

0

. . .

XXh

0

0 -> 1

DS00001569B-page 14

 2013-2015 Microchip Technology Inc.

CAP1296

4.0

GENERAL DESCRIPTION

The CAP1296 is a multiple channel capacitive touch sensor. It contains six (6) individual capacitive touch sensor inputs

with programmable sensitivity for use in touch sensor applications. Each sensor input is calibrated to compensate for

system parasitic capacitance and automatically recalibrated to compensate for gradual environmental changes.

In addition, the CAP1296 can be configured to detect proximity on one or more channels with an optional signal guard

to reduce noise sensitivity.

The CAP1296includes Multiple Pattern Touch recognition that allows the user to select a specific set of buttons to be

touched simultaneously. If this pattern is detected, a status bit is set and an interrupt is generated.

The CAP1296 has Active and Standby states, each with its own sensor input configuration controls. The Combo state

allows a combination of sensor input controls to be used which enables one or more sensor inputs to operate as buttons

while another sensor input is operating as a proximity detector. Power consumption in the Standby and Combo states

is dependent on the number of sensor inputs enabled as well as averaging, sampling time, and cycle time. Deep Sleep

is the lowest power state available, drawing 5µA (typical) of current. In this state, no sensor inputs are active, and com-

munications will wake the device.

The device communicates with a host controller using SMBus / I²C. The host controller may poll the device for updated

information at any time or it may configure the device to flag an interrupt whenever a touch is detected on any sensor

pad.

A typical system diagram is shown in FIGURE 4-1:.

FIGURE 4-1:

SYSTEM DIAGRAM FOR CAP1296

3.0V to 5.5V

Embedded

Controller

10kOhm

resistors

3.0V to 5.5V

0.1uF

1.0uF

GND

VDD

Touch

Button

CS6

CS5

CS4

CAP1296

Touch

Button

Touch

Button

CS1

CS2

Touch

Button

Proximity

Sensor

SG*

* CS3 / SG is a multi-function pin. If not

using the signal guard shown here, CS3

can be another touch button.

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DS00001569B-page 15

CAP1296

4.1

Power States

The CAP1296 has 4 power states depending on the status of the STBY, COMBO, and DSLEEP bits. When the device

transitions between power states, previously detected touches (for channels that are being de-activated) are cleared

and the sensor input status bits are reset.

1. Active - The normal mode of operation. The device is monitoring capacitive sensor inputs enabled in the Active

state.

2. Standby - When the STBY bit is set, the device is monitoring the capacitive sensor inputs enabled in the Standby

state. Interrupts can still be generated based on the enabled channels. The device will still respond to communi-

cations normally and can be returned to the Active state of operation by clearing the STBY bit. Power consump-

tion in this state is dependent on the number of sensor inputs enabled as well as averaging, sampling time, and

cycle time.

3. Combo - When the COMBO bit is set, the device is monitoring capacitive sensor inputs enabled in the Active

state as well as inputs enabled in the Standby state (hence the name “Combo”). Interrupts can still be generated

based on the enabled channels. The device will still respond to communications normally and can be returned

to the Active state of operation by clearing the COMBO bit. Power consumption in this state is dependent on the

number of sensor inputs enabled as well as averaging, sampling time, and cycle time.

4. Deep Sleep - When the DSLEEP bit is set, the device is in its lowest power state. It is not monitoring any capac-

itive sensor inputs. While in Deep Sleep, the CAP1296 can be awakened by SMBus communications targeting

the device. This will not cause the DSLEEP to be cleared so the device will return to Deep Sleep once all com-

munications have stopped. The device can be returned to the Active state of operation by clearing the DSLEEP

bit.

4.2

Reset

The Power-On Reset (POR) circuit holds the device in reset until V_DDhas reached an acceptable level, Power-on Reset

Release Voltage (V_PORR), for minimum operation. The power-up timer (PWRT) is used to extend the start-up period until

all device operation conditions have been met. The power-up timer starts after V_DDreaches V_PORR. POR and PORR

with slow rising V_DDis shown in Figure 4-2.

The Brown-Out Reset (BOR) circuit holds the device in reset when V_DDfalls to a minimum level, V_BORfor longer than

the BOR reset delay (t_BORDC). After a BOR, when V_DDrises above V_PORR, the power-up timer is started again and must

finish before reset is released, as shown in Figure 4-2.

FIGURE 4-2:

POR AND PORR WITH SLOW RISING V AND BOR WITH FALLING V

DD

V_PORR

V_BOR

V_POR

V_DD

GND

SYSRST

T_PWRT

T_BORDCT_PWRT

Undefined

4.3

Capacitive Touch Sensing

The CAP1296 contains six (6) independent capacitive touch sensor inputs. Each sensor input has dynamic range to

detect a change of capacitance due to a touch. Additionally, each sensor input can be configured to be automatically

and routinely recalibrated.

4.3.1

CAPACITIVE TOUCH SENSING SETTINGS

Controls for managing capacitive touch sensor inputs are determined by the power state.

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4.3.1.1

Active State Sensing Settings

The Active state is used for normal operation. Sensor inputs being monitored are determined by the Sensor Input Enable

Register(see Section 5.7, "Sensor Input Enable Register"). Sensitivity is controlled by the Sensitivity Control Register

(see Section 5.5, "Sensitivity Control Register"). Averaging, sample time, and cycle time are controlled by the Averaging

and Sampling Configuration Register (see Section 5.10, "Averaging and Sampling Configuration Register"). Each chan-

nel can have a separate touch detection threshold, as defined in the Sensor Input Threshold registers (see Section 5.19,

"Sensor Input Threshold Registers").

4.3.1.2

Standby State Sensing Settings

The Standby state is used for standby operation. In general, fewer sensor inputs are enabled, and they are programmed

to have more sensitivity. Sensor inputs being monitored are determined by the Standby Channel Register (see Section

5.21, "Standby Channel Register"). Sensitivity is controlled by the Standby Sensitivity Register (see Section 5.23,

"Standby Sensitivity Register"). Averaging, sample time, and cycle time are controlled by the Averaging and Sampling

Configuration Register (see Section 5.22, "Standby Configuration Register"). There is one touch detection threshold,

which applies to all sensors enabled in Standby, as defined in the Standby Threshold Register (see Section 5.24,

"Standby Threshold Register").

4.3.1.3

Combo State Sensing Settings

The Combo state is used when a combination of proximity detection and normal button operation is required. When the

COMBO bit is set, the sensing cycle includes sensor inputs enabled in the Active state as well as sensor inputs enabled

in the Standby state. Sensor inputs enabled in the Active state will use the Active settings described in Section 4.3.1.1,

"Active State Sensing Settings". Sensor inputs enabled in the Standby state will use the Standby settings described in

Section 4.3.1.2, "Standby State Sensing Settings". If a sensor input is enabled in both the Active state and in the Standby

state, the Active state settings will be used in Combo state. The programmed cycle time is determined by STBY_CY_-

TIME[1:0].

The Combo state also has two gain settings. When the COMBO bit is set, the GAIN[1:0] control only applies to the sen-

sors enabled in the Active state, and the C_GAIN[1:0] control applies to the sensors enabled in the Standby state.

4.3.2

SENSING CYCLE

Except when in Deep Sleep, the device automatically initiates a sensing cycle and repeats the cycle every time it fin-

ishes. The cycle polls through each enabled sensor input starting with CS1 and extending through CS6. As each capac-

itive touch sensor input is polled, its measurement is compared against a baseline “not touched” measurement. If the

delta measurement is large enough to exceed the applicable threshold, a touch is detected and an interrupt can be gen-

erated (see Section 4.9.2, "Capacitive Sensor Input Interrupt Behavior").

The sensing cycle time is programmable (see Section 5.10, "Averaging and Sampling Configuration Register" and Sec-

tion 5.22, "Standby Configuration Register"). If all enabled inputs can be sampled in less than the cycle time, the device

is placed into a lower power state for the remainder of the sensing cycle. If the number of active sensor inputs cannot

be sampled within the specified cycle time, the cycle time is extended and the device is not placed in a lower power

state.

4.4

Sensor Input Calibration

Calibration sets the Base Count Registers(Section 5.25, "Sensor Input Base Count Registers") which contain the “not

touched” values used for touch detection comparisons. Calibration automatically occurs after a power-on reset (POR),

when sample time is changed, when the gain is changed, when the calibration sensitivity is changed, and whenever a

sensor input is newly enabled (for example, when transitioning from a power state in which it was disabled to a power

state in which it is enabled). During calibration, the analog sensing circuits are tuned to the capacitance of the untouched

pad. Then, samples are taken from each sensor input so that a base count can be established. After calibration, the

untouched delta counts are zero.

APPLICATION NOTE: During the calibration routine, the sensor inputs will not detect a press for up to 200ms and

the Sensor Base Count Register values will be invalid. In addition, any press on the

corresponding sensor pads will invalidate the calibration.

The host controller can force a calibration for selected sensor inputs at any time using the Calibration Activate and Status

RegisterSection 5.10.1, "Calibration Activate and Status Register". When a bit is set, the corresponding capacitive touch

sensor input will be calibrated (both analog and digital). The bit is automatically cleared once the calibration routine has

successfully finished.

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If analog calibration fails for a sensor input, the corresponding bit is not cleared in the Calibration Activate and Status

Register, and the ACAL_FAIL bit is set in the General Status Register(Section 5.2, "Status Registers"). An interrupt can

be generated. Analog calibration will fail if a noise bit is set or if the calibration value is at the maximum or minimum

value. If digital calibration fails to generate base counts for a sensor input in the operating range, which is +12.5% from

the ideal base count (see TABLE 4-1:), indicating the base capacitance is out of range, the corresponding BC_OUTx bit

is set in the Base Count Out of Limit Register(Section 5.17, "Base Count Out of Limit Register"), and the BC_OUT bit

is set in the General Status Register (Section 5.2, "Status Registers"). An interrupt can be generated. By default, when

a base count is out of limit, analog calibration is repeated for the sensor input; alternatively, the sensor input can be

sampled using the out of limit base count(Section 5.6, "Configuration Registers"). Calibration sensitivity can be adjusted

for each sensor input based on capacitive touch pad capacitance.

TABLE 4-1:

Ideal Base Count

3,200

IDEAL BASE COUNTS

Sample Time

320us

640us

6,400

12,800

25,600

1.28ms

2.56ms

During normal operation there are various options for recalibrating the capacitive touch sensor inputs. Recalibration is

a digital adjustment of the base counts so that the untouched delta count is zero. After a recalibration, if a sensor input’s

base count has shifted +12.5% from the ideal base count, a full calibration will be performed on the sensor input.

4.4.1

AUTOMATIC RECALIBRATION

Each sensor input is regularly recalibrated at a programmable rate(see CAL_CFG[2:0] in Section 5.18, "Recalibration

Configuration Register"). By default, the recalibration routine stores the average 64 previous measurements and peri-

odically updates the base “not touched” setting for the capacitive touch sensor input.

APPLICATION NOTE: Automatic recalibration only works when the delta count is below the active sensor input

threshold. It is disabled when a touch is detected.

4.4.2

NEGATIVE DELTA COUNT RECALIBRATION

It is possible that the device loses sensitivity to a touch. This may happen as a result of a noisy environment, recalibra-

tion when the pad is touched but delta counts do not exceed the threshold, or other environmental changes. When this

occurs, the base untouched sensor input may generate negative delta count values. The NEG_DELTA_CNT[1:0]

bits(see Section 5.18, "Recalibration Configuration Register") can be set to force a recalibration after a specified number

of consecutive negative delta readings. After a delayed recalibration (see Section 4.4.3, "Delayed Recalibration") the

negative delta count recalibration can correct after the touch is released.

APPLICATION NOTE: During this recalibration, the device will not respond to touches.

4.4.3

DELAYED RECALIBRATION

It is possible that a “stuck button” occurs when something is placed on a button which causes a touch to be detected

for a long period. By setting the MAX_DUR_EN bit(see Section 5.6, "Configuration Registers"), a recalibration can be

forced when a touch is held on a button for longer than the duration specified in the MAX_DUR[3:0] bits (see Section

5.8, "Sensor Input Configuration Register").

Note 4-1

Delayed recalibration only works when the delta count is above the active sensor input threshold. If

enabled, it is invoked when a sensor pad touch is held longer than the MAX_DUR bit settings.

Note 4-2

For the power button, which requires that the button be held longer than a regular button, the time

specified by the MAX_DUR[3:0] bits is added to the time required to trigger the qualifying event. This

will prevent the power button from being recalibrated during the time it is supposed to be held.

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4.5

Proximity Detection

Each sensor input can be configured to detect changes in capacitance due to proximity of a touch. This circuitry detects

the change of capacitance that is generated as an object approaches, but does not physically touch, the enabled sensor

pad(s). Generally, sensor inputs used to detect proximity have physically larger pads than standard buttons. In addition,

gain should be increased to increase sensitivity. To improve the signal, the signal guard feature may be used.

4.5.1

SIGNAL GUARD

The signal guard isolates the signal from virtual grounds, as shown in Figure 4-3. It can be used to isolate the proximity

antenna from nearby conductive surfaces that would otherwise attenuate the e-field.

FIGURE 4-3:

SIGNAL GUARD

CAP129X Device

SIGNAL_GUARD

CS pin

Touch Pad

CS pin

4.6

Power Button

The CAP1296 has a “power button” feature. In general, buttons are set for quick response to a touch, especially when

buttons are used for number keypads. However, there are cases where a quick response is not desired, such as when

accidentally brushing the power button causes a device to turn off or on unexpectedly.

The power button feature allows a sensor input to be designated as the “power button” (see Section 5.26, "Power Button

Register"). The power button is configured so that a touch must be held on the button for a designated period of time

before an interrupt is generated; different times can be selected for the Standby and the Active states (see Section 5.27,

"Power Button Configuration Register"). The feature can also be enabled / disabled for both states separately.

APPLICATION NOTE: For the power button feature to work in the Standby and/or Active states, the sensor input

must be enabled in the applicable state. If the power button feature is enabled for both

Standby and Active and the COMBO bit is set, the Standby power button settings will be

used.

After the designated power button has been held for the designated time, an interrupt is generated and the PWR bit is

set in the General Status Register (see Section 5.2, "Status Registers").

4.7

Multiple Touch Pattern Detection

The multiple touch pattern (MTP) detection circuitry can be used to detect lid closure or other similar events. An event

can be flagged based on either a minimum number of sensor inputs or on specific sensor inputs simultaneously exceed-

ing an MTP threshold or having their Noise Flag Status Register bits set. An interrupt can also be generated. During an

MTP event, all touches are blocked (see Section 5.15, "Multiple Touch Pattern Configuration Register").

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4.8

Noise Controls

4.8.1

LOW FREQUENCY NOISE DETECTION

Each sensor input has a low frequency noise detector that will sense if low frequency noise is injected onto the input

with sufficient power to corrupt the readings. By default, if this occurs, the device will reject the corrupted samplesee

DIS_ANA_NOISE bit in Section 5.6.1, "Configuration - 20h") and the corresponding bit is set to a logic ‘1’ in the Noise

Flag Status register (see SHOW_RF_NOISE bit in Section 5.6.2, "Configuration 2 - 44h").

4.8.2

RF NOISE DETECTION

Each sensor input contains an integrated RF noise detector. This block will detect injected RF noise on the CS pin. The

detector threshold is dependent upon the noise frequency. By default, if RF noise is detected on a CS line, that sample

is removed and not compared against the threshold (see DIS_RF_NOISE bit in Section 5.6.2, "Configuration 2 - 44h").

4.8.3

NOISE STATUS AND CONFIGURATION

The Noise Flag Status (see Section 5.3, "Noise Flag Status Registers") bits can be used to indicate RF and/or other

noise. If the SHOW_RF_NOISE bit in the Configuration Register (see Section 5.6, "Configuration Registers") is set to

0, the Noise Flag Status bit for the capacitive sensor input is set if any analog noise is detected. If the

SHOW_RF_NOISE bit is set to 1, the Noise Flag Status bits will only be set if RF noise is detected.

The CAP1208 offers optional noise filtering controls for both analog and digital noise.

For analog noise, there are options for whether the data should be considered invalid. By default, the DIS_ANA_NOISE

bit (see Section 5.6.1, "Configuration - 20h") will block a touch on a sensor input if low frequency analog noise is

detected; the sample is discarded. By default, the DIS_RF_NOISE bit (see Section 5.6.2, "Configuration 2 - 44h") will

block a touch on a sensor input if RF noise is detected; the sample is discarded.

For digital noise, sensor input noise thresholds can be set (see Section 5.20, "Sensor Input Noise Threshold Register").

If a capacitive touch sensor input exceeds the Sensor Noise Threshold but does not exceed the touch threshold (Sensor

Threshold (see Section 5.19, "Sensor Input Threshold Registers") in the Active state or Sensor Standby Threshold in

the Standby state (Section 5.24, "Standby Threshold Register")), it is determined to be caused by a noise spike. The

DIS_DIG_NOISE bit (see Section 5.6.1, "Configuration - 20h") can be set to discard samples that indicate a noise spike

so they are not used in the automatic recalibration routine (see Section 4.4.1, "Automatic Recalibration").

4.9

Interrupts

Interrupts are indicated by the setting of the INT bit in the Main Control Register(see Section 5.1, "Main Control Regis-

ter") and by assertion of the ALERT# pin. The ALERT# pin is cleared when the INT bit is cleared by the user. When the

INT bit is cleared by the user, status bits may be cleared (see Section 5.2, "Status Registers").

4.9.1

ALERT# PIN

The ALERT# pin is an active low output that is driven when an interrupt event is detected.

4.9.2

CAPACITIVE SENSOR INPUT INTERRUPT BEHAVIOR

Each sensor input can be programmed to enable / disable interrupts(see Section 5.11, "Interrupt Enable Register").

When enabled for a sensor input and the sensor input is not the designated power button, interrupts are generated in

one of two ways:

1. An interrupt is generated when a touch is detected and, as a user selectable option, when a release is detected

(by default - see INT_REL_n in Section 5.6.2, "Configuration 2 - 44h"). See FIGURE 4-5:.

2. If the repeat rate is enabled then, so long as the touch is held, another interrupt will be generated based on the

programmed repeat rate (see FIGURE 4-4:).

When the repeat rate is enabled for a sensor input (see Section 5.12, "Repeat Rate Enable Register"), the device uses

an additional control called MPRESS that determines whether a touch is flagged as a simple “touch” or a “press and

hold” (see Section 5.9, "Sensor Input Configuration 2 Register"). The MPRESS[3:0] bits set a minimum press timer.

When the button is touched, the timer begins. If the sensor pad is released before the minimum press timer expires, it

is flagged as a touch and an interrupt (if enabled) is generated upon release. If the sensor input detects a touch for lon-

ger than this timer value, it is flagged as a “press and hold” event. So long as the touch is held, interrupts will be gener-

ated at the programmed repeat rate (see Section 5.8, "Sensor Input Configuration Register") and upon release (if

enabled).

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If a sensor input is the designated power button, an interrupt is not generated as soon as a touch is detected and repeat

rate is not applicable. See Section 4.9.3, "Interrupts for the Power Button".

APPLICATION NOTE: FIGURE 4-4: and FIGURE 4-5: show default operation which is to generate an interrupt upon

sensor pad release.

APPLICATION NOTE: The host may need to poll the device twice to determine that a release has been detected.

FIGURE 4-4:

SENSOR INTERRUPT BEHAVIOR - REPEAT RATE ENABLED

Sensing Cycle

(35ms)

Interrupt on

Touch

Interrupt on

Release

(optional)

Min Press Setting

(280ms)

Button Repeat Rate

(175ms)

Button Repeat Rate

(175ms)

Touch Detected

INT bit

ALERT# pin

Button Status

Write to INT bit

FIGURE 4-5:

SENSOR INTERRUPT BEHAVIOR - NO REPEAT RATE ENABLED

Sensing Cycle

(35ms)

Interrupt on

Touch

Interrupt on

Release

(optional)

Touch Detected

INT bit

ALERT# pin

Button Status

Write to INT bit

4.9.3

INTERRUPTS FOR THE POWER BUTTON

Interrupts are automatically enabled for the power button when the feature is enabled (see Section 4.6, "Power Button").

A touch must be held on the power button for the designated period of time before an interrupt is generated.

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4.9.4

INTERRUPTS FOR MULTIPLE TOUCH PATTERN DETECTION

An interrupt can be generated when the MTP pattern is matched (see Section 5.15, "Multiple Touch Pattern Configura-

tion Register").

4.9.5

INTERRUPTS FOR SENSOR INPUT CALIBRATION FAILURES

An interrupt can be generated when the ACAL_FAIL bit is set, indicating the failure to complete analog calibration of

one or more sensor inputs(see Section 5.2, "Status Registers"). This interrupt can be enabled by setting the ACAL_-

FAIL_INT bit (see Section 5.6, "Configuration Registers").

An interrupt can be generated when the BC_OUT bit is set, indicating the base count is out of limit for one or more sen-

sor inputs(see Section 5.2, "Status Registers"). This interrupt can be enabled by setting the BC_OUT_INT bit (see Sec-

tion 5.6, "Configuration Registers").

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5.0

REGISTER DESCRIPTION

The registers shown in Table 5-1 are accessible through the communications protocol. An entry of ‘-’ indicates that the

bit is not used and will always read ‘0’.

TABLE 5-1:

REGISTER SET IN HEXADECIMAL ORDER

Register

Address

Default

Value

R/W

Register Name

Function

Page

Controls power states and indicates

an interrupt

00h

02h

03h

R/W

R

Main Control

General Status

00h

Page 26

Page 28

Stores general status bits

Returns the state of the sampled

capacitive touch sensor inputs

Sensor Input Status

Stores the noise flags for sensor

inputs

0Ah

10h

11h

12h

13h

14h

15h

R

Noise Flag Status

00h

Page 29

Sensor Input 1 Delta

Count

Stores the delta count for CS1

Stores the delta count for CS2

Stores the delta count for CS3

Stores the delta count for CS4

Stores the delta count for CS5

Stores the delta count for CS6

Sensor Input 2 Delta

Count

Sensor Input 3 Delta

Count

Sensor Input 4 Delta

Count

Sensor Input 5 Delta

Count

Sensor Input 6 Delta

Count

Controls the sensitivity of the

threshold and delta counts and data

scaling of the base counts

1Fh

R/W

Sensitivity Control

2Fh

Page 30

20h

21h

R/W

Configuration

Controls general functionality

20h

3Fh

Page 31

Page 33

Controls which sensor inputs are

monitored in Active

Sensor Input Enable

Sensor Input

Configuration

Controls max duration and auto-

repeat delay

22h

23h

24h

R/W

A4h

07h

39h

Page 33

Page 35

Page 36

Sensor Input

Configuration 2

Controls the MPRESS (“press and

hold”) setting

Averaging and

Sampling Config

Controls averaging and sampling

window for Active

Forces calibration for capacitive

touch sensor inputs and indicates

calibration failure

Calibration Activate

and Status

26h

27h

R/W

00h

3Fh

Page 37

Page 38

Determines which capacitive sensor

inputs can generate interrupts

Interrupt Enable

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TABLE 5-1:

REGISTER SET IN HEXADECIMAL ORDER (CONTINUED)

Register

Address

Default

Value

R/W

Register Name

Function

Page

Enables repeat rate for specific

sensor inputs

28h

29h

R/W

Repeat Rate Enable

Signal Guard Enable

3Fh

00h

Page 39

Enables the signal guard for specific

sensor inputs

Determines the number of

simultaneous touches to flag a

multiple touch condition

Multiple Touch

Configuration

2Ah

2Bh

2Dh

R/W

80h

00h

3Fh

Page 40

Page 41

Multiple Touch Pattern

Configuration

Determines the multiple touch

pattern (MTP) configuration

Determines the pattern or number of

sensor inputs used by the MTP

circuitry

Multiple Touch Pattern

Base Count Out of

Limit

Indicates whether sensor inputs

have a base count out of limit

2Eh

2Fh

30h

31h

32h

33h

34h

35h

38h

R

00h

8Ah

40h

01h

Page 42

Page 43

Page 44

Page 45

Recalibration

Configuration

Determines recalibration timing and

sampling window

R/W

Sensor Input 1

Threshold

Stores the touch detection threshold

for Active for CS1

Sensor Input 2

Threshold

Stores the touch detection threshold

for Active for CS2

Sensor Input 3

Threshold

Stores the touch detection threshold

for Active for CS3

Sensor Input 4

Threshold

Stores the touch detection threshold

for Active for CS4

Sensor Input 5

Threshold

Stores the touch detection threshold

for Active for CS5

Sensor Input 6

Threshold

Stores the touch detection threshold

for Active for CS6

Sensor Input Noise

Threshold

Stores controls for selecting the

noise threshold for all sensor inputs

Standby Configuration Registers

Controls which sensor inputs are

enabled for Standby

40h

41h

42h

43h

44h

R/W

Standby Channel

Standby Configuration

Standby Sensitivity

Standby Threshold

Configuration 2

00h

39h

02h

40h

Page 45

Page 46

Page 47

Page 48

Page 31

Controls averaging and sensing

cycle time for Standby

Controls sensitivity settings used for

Standby

Stores the touch detection threshold

for Standby

Stores additional configuration

controls for the device

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TABLE 5-1:

REGISTER SET IN HEXADECIMAL ORDER (CONTINUED)

Register

Address

Default

Page

R/W

Register Name

Function

Base Count Registers

Value

Sensor Input 1 Base

Count

Stores the reference count value for

sensor input 1

50h

51h

52h

53h

54h

55h

R

C8h

Page 48

Sensor Input 2 Base

Count

Stores the reference count value for

sensor input 2

Sensor Input 3 Base

Count

Stores the reference count value for

sensor input 3

Sensor Input 4 Base

Count

Stores the reference count value for

sensor input 4

Sensor Input 5 Base

Count

Stores the reference count value for

sensor input 5

Sensor Input 6 Base

Count

Stores the reference count value for

sensor input 6

Power Button Registers

60h

61h

R/W

Power Button

Specifies the power button

00h

22h

Page 49

Page 50

Power Button

Configuration

Configures the power button feature

Calibration Sensitivity Configuration Registers

Calibration Sensitivity

Stores calibration sensitivity settings

for proximity

80h

81h

R/W

00h

Page 51

Configuration 1

Calibration Sensitivity

Configuration 2

Stores calibration sensitivity settings

for proximity

Calibration Registers

R

Sensor Input 1

Calibration

Stores the upper 8-bit calibration

value for CS1

B1h

B2h

B3h

B4h

B5h

B6h

B9h

BAh

00h

Page 50

Sensor Input 2

Calibration

Stores the upper 8-bit calibration

value for CS2

Sensor Input 3

Calibration

Stores the upper 8-bit calibration

value for CS3

Sensor Input 4

Calibration

Stores the upper 8-bit calibration

value for CS4

Sensor Input 5

Calibration

Stores the upper 8-bit calibration

value for CS5

Sensor Input 6

Calibration

Stores the upper 8-bit calibration

value for CS6

Sensor Input

Calibration LSB 1

Stores the 2 LSBs of the calibration

value for CS1 - CS4

Sensor Input

Calibration LSB 2

Stores the 2 LSBs of the calibration

value for CS5 - CS6

ID Registers

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TABLE 5-1:

REGISTER SET IN HEXADECIMAL ORDER (CONTINUED)

Register

Address

Default

Value

R/W

Register Name

Function

Page

Stores a fixed value that identifies

the CAP1296-1

FDh

FEh

FFh

R

Product ID

Manufacturer ID

Revision

69h

5Dh

00h

Page 52

Stores a fixed value that identifies

MCHP

Stores a fixed value that represents

the revision number

During power-on reset (POR), the default values are stored in the registers. A POR is initiated when power is first

applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical character-

istics.

When a bit is “set”, this means it’s at a logic ‘1’. When a bit is “cleared”, this means it’s at a logic ‘0’.

5.1

Main Control Register

TABLE 5-2:

MAIN CONTROL REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

00h

R/W

Main Control

GAIN[1:0]

STBY

DSLEEP

C_GAIN[1:0] COMBO

INT

00h

The Main Control register controls the primary power state of the device (see Section 4.1, "Power States").

If more than one power state bit is set, the actual power state will be as shown in Table 5-3, "Power State Bit Overrides".

TABLE 5-3:

POWER STATE BIT OVERRIDES

DSLEEP

COMBO

STBY

Power State

0

1

0

1

X

0

1

Active

Standby

Combo

DSleep

X

Bits 7 - 6 - GAIN[1:0] - Controls the analog gain used by the capacitive touch sensing circuitry. As the gain is increased,

the effective sensitivity is likewise increased as a smaller delta capacitance is required to generate the same delta count

values. The sensitivity settings may need to be adjusted along with the gain settings such that data overflow does not

occur.

APPLICATION NOTE: The GAIN[1:0] settings apply to both Standby and Active states, unless the COMBO bit is

set. When the COMBO bit is set, this control only applies to the sensors enabled in the

Active state, and the C_GAIN[1:0] control applies to the sensors enabled in the Standby

state.

APPLICATION NOTE: Whenever the gain settings change, the device will recalibrate all sensor inputs as if they

had no base count.

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TABLE 5-4:

GAIN AND C_GAIN BIT DECODE

GAIN[1:0] or C_GAIN[1:0]

0

Capacitive Touch Sensor Input Gain

1

0

1

0

1

0

1

2

4

8

Bit 5 - STBY - Enables Standby.

• ‘0’ (default) - The device is not in the Standby state.

• ‘1’ - The device is in the Standby state. Capacitive touch sensor input scanning is limited to the sensor inputs set in

the Standby Channel register (see Section 5.21, "Standby Channel Register"). The status registers will not be

cleared until read. Sensor inputs that are no longer sampled will flag a release and then remain in a non-touched

state.

Bit 4 - DSLEEP - Enables Deep Sleep.

• ‘0’ (default) - The device is not in the Deep Sleep state.

• ‘1’ - The device is in the Deep Sleep state. All sensor input scanning is disabled. The status registers are automat-

ically cleared and the INT bit is cleared..

Bits 3 - 2 - C_GAIN[1:0] - When the COMBO bit is set, this bit controls the analog gain used for capacitive touch sensor

inputs enabled in the Standby state. As the gain is increased, the effective sensitivity is likewise increased as a smaller

delta capacitance is required to generate the same delta count values. The Standby sensitivity settings may need to be

adjusted along with the gain settings such that data overflow does not occur.

APPLICATION NOTE: The C_GAIN[1:0] setting is only used if the COMBO bit is set. When the COMBO bit is set,

this control only applies to the sensors enabled in the Standby state, and the GAIN[1:0]

control applies to the sensors enabled in the Active state.

Bit 1 - COMBO - Enables Combo state (see Section 4.3.1.3, "Combo State Sensing Settings").

• ‘0’ (default) - The device is not in the Combo state.

• ‘1’ - The device is in the Combo state. The device is monitoring sensor inputs enabled in the Active state (see Sec-

tion 5.7, "Sensor Input Enable Register") as well as those enabled in the Standby state (see Section 5.21,

"Standby Channel Register"). The status registers will not be cleared until read. Sensor inputs that are no longer

sampled will flag a release and then remain in a non-touched state.

Bit 0 - INT - Indicates that there is an interrupt (see Section 4.9, "Interrupts"). When this bit is set, it asserts the ALERT#

pin. If a channel detects a touch but interrupts are not enabled for that channel (see Section 5.11, "Interrupt Enable Reg-

ister"), no action is taken. This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT# pin will be

deasserted, and all status registers will be cleared if the condition has been removed.

• ‘0’ - No interrupt pending.

• ‘1’ - An interrupt condition occurred, and the ALERT# pin has been asserted.

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5.2

Status Registers

TABLE 5-5:

STATUS REGISTERS

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

BC_

OUT

ACAL

_FAIL

02h

R

General Status

-

PWR

-

MULT

MTP

TOUCH

00h

Sensor Input

Status

03h

-

CS6

CS5

CS4

CS3

CS2

CS1

00h

All status bits are cleared when the device enters Deep Sleep (DSLEEP = ‘1’ - see Section 5.1, "Main Control Register").

5.2.1 GENERAL STATUS - 02H

Bit 6 - BC_OUT - Indicates that the base count is out of limit for one or more enabled sensor inputs (see Section 4.4,

"Sensor Input Calibration"). This bit will not be cleared until all enabled sensor inputs have base counts within the limit.

• ‘0’ - All enabled sensor inputs have base counts in the operating range.

• ‘1’ - One or more enabled sensor inputs has the base count out of limit. A status bit is set in the Base Count Out of

Limit Register (see Section 5.17, "Base Count Out of Limit Register").

Bit 5 - ACAL_FAIL - Indicates analog calibration failure for one or more enabled sensor inputs (see Section 4.4, "Sensor

Input Calibration"). This bit will not be cleared until all enabled sensor inputs have successfully completed analog cali-

bration.

• ‘0’ - All enabled sensor inputs were successfully calibrated.

• ‘1’ - One or more enabled sensor inputs failed analog calibration. A status bit is set in the Calibration Active Regis-

ter (see Section 5.10.1, "Calibration Activate and Status Register").

Bit 4 - PWR - Indicates that the designated power button has been held for the designated time (see Section 4.6, "Power

Button"). This bit will cause the INT bit to be set. This bit is cleared when the INT bit is cleared if there is no longer a

touch on the power button.

• ‘0’ - The power button has not been held for the required time or is not enabled.

• ‘1’ - The power button has been held for the required time.

Bit 2 - MULT - Indicates that the device is blocking detected touches due to the Multiple Touch detection circuitry (see

Section 5.14, "Multiple Touch Configuration Register"). This bit will not cause the INT bit to be set and hence will not

cause an interrupt.

Bit 1 - MTP - Indicates that the device has detected a number of sensor inputs that exceed the MTP threshold either via

the pattern recognition or via the number of sensor inputs (see Section 5.15, "Multiple Touch Pattern Configuration Reg-

ister"). This bit will cause the INT bit to be set if the MTP_ALERT bit is also set. This bit is cleared when the INT bit is

cleared if the condition that caused it to be set has been removed.

Bit 0 - TOUCH - Indicates that a touch was detected. This bit is set if any bit in the Sensor Input Status register is set.

5.2.2

SENSOR INPUT STATUS - 03H

The Sensor Input Status Register stores status bits that indicate a touch has been detected. A value of ‘0’ in any bit

indicates that no touch has been detected. A value of ‘1’ in any bit indicates that a touch has been detected.

All bits are cleared when the INT bit is cleared and if a touch on the respective capacitive touch sensor input is no longer

present. If a touch is still detected, the bits will not be cleared (but this will not cause the interrupt to be asserted).

Bit 5 - CS6 - Indicates that a touch was detected on Sensor Input 6.

Bit 4 - CS5 - Indicates that a touch was detected on Sensor Input 5.

Bit 3 - CS4 - Indicates that a touch was detected on Sensor Input 4.

Bit 2 - CS3 - Indicates that a touch was detected on Sensor Input 3.

Bit 1 - CS2 - Indicates that a touch was detected on Sensor Input 2.

Bit 0 - CS1 - Indicates that a touch was detected on Sensor Input 1.

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5.3

Noise Flag Status Registers

TABLE 5-6:

NOISE FLAG STATUS REGISTERS

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Noise Flag

Status

-

CS6_

NOISE

CS5_

NOISE

CS4_

NOISE NOISE

CS3_

CS2_

NOISE

CS1_

NOISE

0Ah

R

00h

The Noise Flag Status registers store status bits that can be used to indicate that the analog block detected noise above

the operating region of the analog detector or the RF noise detector (see Section 4.8.3, "Noise Status and Configura-

tion"). These bits indicate that the most recently received data from the sensor input is invalid and should not be used

for touch detection. So long as the bit is set for a particular channel, the delta count value is reset to 00h and thus no

touch is detected.

These bits are not sticky and will be cleared automatically if the analog block does not report a noise error.

APPLICATION NOTE: If the MTP detection circuitry is enabled, these bits count as sensor inputs above the MTP

threshold (see Section 4.7, "Multiple Touch Pattern Detection") even if the corresponding

delta count is not. If the corresponding delta count also exceeds the MTP threshold, it is not

counted twice.

APPLICATION NOTE: Regardless of the state of the Noise Status bits, if low frequency noise is detected on a

sensor input, that sample will be discarded unless the DIS_ANA_NOISE bit is set. As well,

if RF noise is detected on a sensor input, that sample will be discarded unless the

DIS_RF_NOISE bit is set.

5.4

Sensor Input Delta Count Registers

TABLE 5-7:

Addr

SENSOR INPUT DELTA COUNT REGISTERS

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input 1

Delta Count

10h

11h

12h

13h

14h

15h

R

Sign

64

32

16

8

4

2

1

00h

Sensor Input 2

Delta Count

R

Sign

64

32

16

8

4

2

1

00h

Sensor Input 3

Delta Count

Sensor Input 4

Delta Count

Sensor Input 5

Delta Count

Sensor Input 6

Delta Count

The Sensor Input Delta Count registers store the delta count that is compared against the threshold used to determine

if a touch has been detected. The count value represents a change in input due to the capacitance associated with a

touch on one of the sensor inputs and is referenced to a calibrated base “not touched” count value. The delta is an

instantaneous change and is updated once per sensor input per sensing cycle (see Section 4.3.2, "Sensing Cycle").

The value presented is a standard 2’s complement number. In addition, the value is capped at a value of 7Fh. A reading

of 7Fh indicates that the sensitivity settings are too high and should be adjusted accordingly (see Section 5.5).

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The value is also capped at a negative value of 80h for negative delta counts which may result upon a release.

5.5

Sensitivity Control Register

TABLE 5-8:

SENSITIVITY CONTROL REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

1Fh

R/W

Sensitivity Control

-

DELTA_SENSE[2:0]

BASE_SHIFT[3:0]

2Fh

The Sensitivity Control register controls the sensitivity of a touch detection.

Bits 6-4 DELTA_SENSE[2:0] - Controls the sensitivity of a touch detection for sensor inputs enabled in the Active state.

The sensitivity settings act to scale the relative delta count value higher or lower based on the system parameters. A

setting of 000b is the most sensitive while a setting of 111b is the least sensitive. At the more sensitive settings, touches

are detected for a smaller delta capacitance corresponding to a “lighter” touch. These settings are more sensitive to

noise, however, and a noisy environment may flag more false touches with higher sensitivity levels.

APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitive settings, the

MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch

^{of approximately 0.25% of the base capacitance (or a}C of 25fF from a 10pF base

capacitance). Conversely, a value of 1x is the least sensitive setting available. At these

settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts

out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance

^{(or a}C of 3.33pF from a 10pF base capacitance).

TABLE 5-9:

DELTA_SENSE BIT DECODE

DELTA_SENSE[2:0]

1

Sensitivity Multiplier

2

0

1

0

1

0

1

0

1

0

1

0

1

0

1

128x (most sensitive)

64x

32x (default)

16x

8x

4x

2x

1x - (least sensitive)

Bits 3 - 0 - BASE_SHIFT[3:0] - Controls the scaling and data presentation of the Base Count registers. The higher the

value of these bits, the larger the range and the lower the resolution of the data presented. The scale factor represents

the multiplier to the bit-weighting presented in these register descriptions.

APPLICATION NOTE: The BASE_SHIFT[3:0] bits normally do not need to be updated. These settings will not affect

touch detection or sensitivity. These bits are sometimes helpful in analyzing the Cap Sensing

board performance and stability.

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TABLE 5-10: BASE_SHIFT BIT DECODE

BASE_SHIFT[3:0]

Data Scaling Factor

3

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1x

2x

4x

8x

16x

32x

64x

128x

256x

(default = 1111b)

All others

5.6

Configuration Registers

TABLE 5-11: CONFIGURATION REGISTERS

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

DIS_

DIG_

NOISE

DIS_

ANA_

NOISE

TIME

OUT

MAX_

DUR_EN

20h

R/W

Configuration

-

20h

BC_

OUT_

RECAL

BLK_

PWR_

CTRL

BC_

OUT_

INT

SHOW_

RF_

NOISE

DIS_

RF_

NOISE

ACAL

_FAIL REL_

_INT

INT_

Configuration

2

44h

R/W

-

40h

n

The Configuration registers control general global functionality that affects the entire device.

5.6.1

Bit 7 - TIMEOUT - Enables the timeout and idle functionality of the SMBus protocol.

• ‘0’ (default) - The SMBus timeout and idle functionality are disabled. The SMBus interface will not time out if the

CONFIGURATION - 20H

clock line is held low. Likewise, it will not reset if both the data and clock lines are held high for longer than 200us.

• ‘1’ - The SMBus timeout and idle functionality are enabled. The SMBus interface will reset if the clock line is held

low for longer than 30ms. Likewise, it will reset if both the data and clock lines are held high for longer than 200us.

Bit 5 - DIS_DIG_NOISE - Determines whether the digital noise threshold (see Section 5.20, "Sensor Input Noise Thresh-

old Register") is used by the device. Setting this bit disables the feature.

• ‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does not exceed the

touch threshold, the sample is discarded and not used for the automatic recalibration routine.

• ‘1’ (default) - The noise threshold is disabled. Any delta count that is less than the touch threshold is used for the

automatic recalibration routine.

Bit 4 - DIS_ANA_NOISE - Determines whether the analog noise filter is enabled. Setting this bit disables the feature.

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• ‘0’ (default) - If low frequency noise is detected by the analog block, the delta count on the corresponding channel

is set to 0. Note that this does not require that Noise Status bits be set.

• ‘1’ - A touch is not blocked even if low frequency noise is detected.

Bit 3 - MAX_DUR_EN - Determines whether the maximum duration recalibration is enabled.

• ‘0’ (default) - The maximum duration recalibration functionality is disabled. A touch may be held indefinitely and no

recalibration will be performed on any sensor input.

• ‘1’ - The maximum duration recalibration functionality is enabled. If a touch is held for longer than the MAX_DUR

bit settings (see Section 5.8), the recalibration routine will be restarted (see Section 4.4.3, "Delayed Recalibra-

tion").

5.6.2

CONFIGURATION 2 - 44H

Bit 6 - BC_OUT_RECAL - Controls whether to retry analog calibration when the base count is out of limit for one or more

sensor inputs.

• ‘0’ - When the BC_OUTx bit is set for a sensor input, the out of limit base count will be used for the sensor input.

• ‘1’ (default) - When the BC_OUTx bit is set for a sensor input (see Section 5.17, "Base Count Out of Limit Regis-

ter"), analog calibration will be repeated on the sensor input.

Bit 5 - BLK_PWR_CTRL - Determines whether the device will reduce power consumption while waiting between con-

version time completion and the end of the sensing cycle.

• ‘0’ (default) - The device will reduce power consumption during the time between the end of the last conversion

and the end of the sensing cycle.

• ‘1’ - The device will not reduce power consumption during the time between the end of the last conversion and the

end of the sensing cycle.

Bit 4 - BC_OUT_INT - Controls the interrupt behavior when the base count is out of limit for one or more sensor inputs.

• ‘0’ (default) - An interrupt is not generated when the BC_OUT bit is set (see Section 5.2, "Status Registers").

• ‘1’ - An interrupt is generated when the BC_OUT bit is set.

Bit 3 - SHOW_RF_NOISE - Determines whether the Noise Status bits will show RF Noise as the only input source.

• ‘0’ (default) - The Noise Status registers will show both RF noise and low frequency noise if either is detected on a

capacitive touch sensor input.

• ‘1’ - The Noise Status registers will only show RF noise if it is detected on a capacitive touch sensor input. Low fre-

quency noise will still be detected and touches will be blocked normally; however, the status bits will not be

updated.

Bit 2 - DIS_RF_NOISE - Determines whether the RF noise filter is enabled. Setting this bit disables the feature.

• ‘0’ (default) - If RF noise is detected by the analog block, the delta count on the corresponding channel is set to 0.

Note that this does not require that Noise Status bits be set.

• ‘1’ - A touch is not blocked even if RF noise is detected.

Bit 1 - ACAL_FAIL_INT - Controls the interrupt behavior when analog calibration fails for one or more sensor inputs (see

Section 4.4, "Sensor Input Calibration").

• ‘0’ (default) - An interrupt is not generated when the ACAL_FAIL bit is set (see Section 5.2, "Status Registers").

• ‘1’ - An interrupt is generated when the ACAL_FAIL bit is set

Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button (see Section 4.9.2, "Capac-

itive Sensor Input Interrupt Behavior").

• ‘0’ (default) - An interrupt is generated when a press is detected and again when a release is detected and at the

repeat rate (if enabled - see Section 5.12).

• ‘1’ - An interrupt is generated when a press is detected and at the repeat rate but not when a release is detected.

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5.7

Sensor Input Enable Register

TABLE 5-12: SENSOR INPUT ENABLE REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input

Enable

21h

R/W

-

CS6_EN

CS5_EN

CS4_EN

CS3_EN

CS2_EN

CS1_EN

3Fh

The Sensor Input Enable register determines whether a capacitive touch sensor input is included in the sensing cycle

in the Active state.

For all bits in this register:

• ‘0’ - The specified input is not included in the sensing cycle in the Active state.

• ‘1’ (default) - The specified input is included in the sensing cycle in the Active state.

Bit 5 - CS6_EN - Determines whether the CS6 input is monitored in the Active state.

Bit 4 - CS5_EN - Determines whether the CS5 input is monitored in the Active state.

Bit 3 - CS4_EN - Determines whether the CS4 input is monitored in the Active state.

Bit 2 - CS3_EN - Determines whether the CS3 input is monitored in the Active state.

Bit 1 - CS2_EN - Determines whether the CS2 input is monitored in the Active state.

Bit 0 - CS1_EN - Determines whether the CS1 input is monitored in the Active state.

5.8

Sensor Input Configuration Register

TABLE 5-13: SENSOR INPUT CONFIGURATION REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

A4h

Sensor Input

Configuration

22h

R/W

MAX_DUR[3:0]

RPT_RATE[3:0]

The Sensor Input Configuration Register controls timings associated with the capacitive sensor inputs.

Bits 7 - 4 - MAX_DUR[3:0] - (default 1010b) - Determines the maximum time that a sensor pad is allowed to be touched

until the capacitive touch sensor input is recalibrated (see Section 4.4.3, "Delayed Recalibration"), as shown in Table 5-

14.

TABLE 5-14: MAX_DUR BIT DECODE

MAX_DUR[3:0]

Time before Recalibration

3

2

1

0

1

0

1

0

1

0

1

0

1

560ms

840ms

1120ms

1400ms

1680ms

2240ms

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TABLE 5-14: MAX_DUR BIT DECODE (CONTINUED)

MAX_DUR[3:0]

Time before Recalibration

3

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

2800ms

3360ms

3920ms

4480ms

5600ms (default)

6720ms

7840ms

8906ms

10080ms

11200ms

Bits 3 - 0 - RPT_RATE[3:0] - (default 0100b) Determines the time duration between interrupt assertions when auto

repeat is enabled (see Section 4.9.2, "Capacitive Sensor Input Interrupt Behavior"). The resolution is 35ms and the

range is from 35ms to 560ms as shown in Table 5-15.

TABLE 5-15: RPT_RATE BIT DECODE

RPT_RATE[3:0]

Interrupt Repeat Rate

3

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

35ms

70ms

105ms

140ms

175ms (default)

210ms

245ms

280ms

315ms

350ms

385ms

420ms

455ms

490ms

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TABLE 5-15: RPT_RATE BIT DECODE (CONTINUED)

RPT_RATE[3:0]

Interrupt Repeat Rate

3

2

1

0

1

0

1

525ms

560ms

5.9

Sensor Input Configuration 2 Register

TABLE 5-16: SENSOR INPUT CONFIGURATION 2 REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input

Configuration 2

23h

R/W

-

M_PRESS[3:0]

07h

Bits 3 - 0 - M_PRESS[3:0] - (default 0111b) - Determines the minimum amount of time that sensor inputs configured to

use auto repeat must detect a sensor pad touch to detect a “press and hold” event (see Section 4.9.2, "Capacitive Sen-

sor Input Interrupt Behavior"). If the sensor input detects a touch for longer than the M_PRESS[3:0] settings, a “press

and hold” event is detected. If a sensor input detects a touch for less than or equal to the M_PRESS[3:0] settings, a

touch event is detected.

The resolution is 35ms and the range is from 35ms to 560ms as shown in Table 5-17.

TABLE 5-17: M_PRESS BIT DECODE

M_PRESS[3:0]

M_PRESS Settings

3

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

35ms

70ms

105ms

140ms

175ms

210ms

245ms

280ms (default)

315ms

350ms

385ms

420ms

455ms

490ms

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TABLE 5-17: M_PRESS BIT DECODE (CONTINUED)

M_PRESS[3:0]

M_PRESS Settings

3

2

1

0

1

0

1

525ms

560ms

5.10 Averaging and Sampling Configuration Register

TABLE 5-18: AVERAGING AND SAMPLING CONFIGURATION REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Averaging and

Sampling

Config

CYCLE_TIME

[1:0]

24h

R/W

-

AVG[2:0]

SAMP_TIME[1:0]

39h

The Averaging and Sampling Configuration register controls the number of samples taken and the target sensing cycle

time for sensor inputs enabled in the Active state.

Bits 6 - 4 - AVG[2:0] - Determines the number of samples that are taken for all channels enabled in the Active state

during the sensing cycle as shown in Table 5-19. All samples are taken consecutively on the same channel before the

next channel is sampled and the result is averaged over the number of samples measured before updating the mea-

sured results.

For example, if CS1, CS2, and CS3 are sampled during the sensing cycle, and the AVG[2:0] bits are set to take 4 sam-

ples per channel, then the full sensing cycle will be: CS1, CS1, CS1, CS1, CS2, CS2, CS2, CS2, CS3, CS3, CS3, CS3.

TABLE 5-19: AVG BIT DECODE

AVG[2:0]

Number Of Samples Taken Per

Measurement

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

2

4

8 (default)

16

32

64

128

Bits 3 - 2 - SAMP_TIME[1:0] - Determines the time to take a single sample as shown in Table 5-20. Sample time affects

the magnitude of the base counts, as shown in Table 4-1, "Ideal Base Counts".

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TABLE 5-20: SAMP_TIME BIT DECODE

SAMP_TIME[1:0]

1

Sample Time

0

1

0

1

0

1

320us

640us

1.28ms (default)

2.56ms

Bits 1 - 0 - CYCLE_TIME[1:0] - Determines the desired sensing cycle time for channels enabled in the Active state, as

shown in Table 5-21. All enabled channels are sampled at the beginning of the sensing cycle. If additional time is

remaining, the device is placed into a lower power state for the remainder of the sensing cycle.

TABLE 5-21: CYCLE_TIME BIT DECODE

CYCLE_TIME[1:0]

Programmed Sensing Cycle Time

1

0

1

0

1

0

1

35ms

70ms (default)

105ms

140ms

APPLICATION NOTE: The programmed sensing cycle time (CYCLE_TIME[1:0]) is only maintained if the actual time

to take the samples is less than the programmed cycle time. The AVG[2:0] bits will take

priority, so the sensing cycle time will be extended as necessary to accommodate the

number of samples to be measured.

5.10.1

CALIBRATION ACTIVATE AND STATUS REGISTER

TABLE 5-22: CALIBRATION ACTIVATE AND STATUS REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Calibration

Activate

and Status

CS6_

CAL

CS5_

CAL

CS4_

CAL

CS3_

CAL

CS2_

CAL

CS1_

CAL

26h

R/W

-

00h

The Calibration Activate and Status Register serves a dual function:

1. It forces the selected sensor inputs to be calibrated, affecting both the analog and digital blocks (see Section 4.4,

"Sensor Input Calibration"). When one or more bits are set, the device performs the calibration routine on the

corresponding sensor inputs. When the analog calibration routine is finished, the CALX[9:0] bits are updated (see

Section 5.28, "Sensor Input Calibration Registers"). If the analog calibration routine completed successfully for a

sensor input, the corresponding bit is automatically cleared.

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APPLICATION NOTE: In the case above, bits can be set by host or are automatically set by the device whenever

a sensor input is newly enabled (such as coming out of Deep Sleep, after power-on reset,

when a bit is set in the Sensor Enable Channel Enable register (21h) and the device is in

the Active state, or when a bit is set in the Standby Channel Enable Register (40h) and the

device is in the Standby state).

2. It serves as an indicator of an analog calibration failure. If any of the bits could not be cleared, the ACAL_FAIL

bit is set (see Section 5.2, "Status Registers"). A bit will fail to clear if a noise bit is set or if the calibration value

is at the maximum or minimum value.

APPLICATION NOTE: In the case above, do not check the Calibration Activate and Status bits for failures unless

the ACAL_FAIL bit is set. In addition, if a sensor input is newly enabled, do not check the

Calibration Activate and Status bits until time has elapsed to complete calibration on the

sensor input. Otherwise, the ACAL_FAIL bit may be set for one sensor input, but the newly

enabled sensor input may still be set to ‘1’ in the Calibration Activate and Status, not because

it failed, but because it has not been calibrated yet.

For all bits in this register:

• ‘0’ - No action needed.

• ‘1’ - Writing a ‘1’, forces a calibration on the corresponding sensor input. If the ACAL_FAIL flag is set and this bit is

set (see application note above), the sensor input could not complete analog calibration.

Bit 5 - CS6_CAL - Bit for CS6 input.

Bit 4 - CS5_CAL - Bit for CS5 input.

Bit 3 - CS4_CAL - Bit for CS4 input.

Bit 2 - CS3_CAL - Bit for CS3 input.

Bit 1 - CS2_CAL - Bit for CS2 input.

Bit 0 - CS1_CAL - Bit for CS1 input.

APPLICATION NOTE: Writing a ‘0’ to clear a ‘1’ may cause a planned calibration to be skipped, if the calibration

routine had not reached the sensor input yet.

5.11 Interrupt Enable Register

TABLE 5-23: INTERRUPT ENABLE REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Interrupt

Enable

CS6_

INT_EN

CS5_

INT_EN

CS4_

INT_EN

CS3_

INT_EN

CS2_

INT_EN

CS1_

INT_EN

27h

R/W

-

3Fh

The Interrupt Enable register determines whether a sensor pad touch or release (if enabled) causes an interrupt (see

Section 4.9, "Interrupts").

For all bits in this register:

• ‘0’ - The ALERT# pin will not be asserted if a touch is detected on the specified sensor input.

• ‘1’ (default) - The ALERT# pin will be asserted if a touch is detected on the specified sensor input.

Bit 5 - CS6_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS6 (associated with the CS6

status bit).

Bit 4 - CS5_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS5 (associated with the CS5

status bit).

Bit 3 - CS4_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS4 (associated with the CS4

status bit).

Bit 2 - CS3_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS3 (associated with the CS3

status bit).

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Bit 1 - CS2_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS2 (associated with the CS2

status bit).

Bit 0 - CS1_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS1 (associated with the CS1

status bit).

5.12 Repeat Rate Enable Register

TABLE 5-24: REPEAT RATE ENABLE REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Repeat Rate

Enable

CS6_

RPT_EN

CS5_

RPT_EN

CS4_

RPT_EN

CS3_

RPT_EN

CS2_

RPT_EN

CS1_

RPT_EN

28h

R/W

-

3Fh

The Repeat Rate Enable register enables the repeat rate of the sensor inputs as described in Section 4.9.2, "Capacitive

Sensor Input Interrupt Behavior".

For all bits in this register:

• ‘0’ - The repeat rate for the specified sensor input is disabled. It will only generate an interrupt when a touch is

detected and when a release is detected (if enabled) no matter how long the touch is held.

• ‘1’ (default) - The repeat rate for the specified sensor input is enabled. In the case of a “touch” event, it will gener-

ate an interrupt when a touch is detected and a release is detected (as determined by the INT_REL_n bit - see

Section 5.6, "Configuration Registers"). In the case of a “press and hold” event, it will generate an interrupt when a

touch is detected and at the repeat rate so long as the touch is held.

Bit 5 - CS6_RPT_EN - Enables the repeat rate for capacitive touch sensor input 6.

Bit 4 - CS5_RPT_EN - Enables the repeat rate for capacitive touch sensor input 5.

Bit 3 - CS4_RPT_EN - Enables the repeat rate for capacitive touch sensor input 4.

Bit 2 - CS3_RPT_EN - Enables the repeat rate for capacitive touch sensor input 3.

Bit 1 - CS2_RPT_EN - Enables the repeat rate for capacitive touch sensor input 2.

Bit 0 - CS1_RPT_EN - Enables the repeat rate for capacitive touch sensor input 1.

5.13 Signal Guard Enable Register

TABLE 5-25: SIGNAL GUARD ENABLE REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Signal

Guard

Enable

CS6_

SG_EN

CS5_

SG_EN

CS4_

SG_EN

CS2_

SG_EN

CS1_

SG_EN

29h

R/W

-

00h

The Signal Guard Enable register enables the signal guard for the specified sensor inputs as described in Section 4.5.1,

"Signal Guard". When the signal guard is enabled, CS3 is disabled.

For all bits in this register:

• ‘0’ (default) - The signal guard is disabled for the specified sensor input.

• ‘1’ - The signal guard is enabled for the specified sensor input.

Bit 5 - CS6_SG_EN - Enables the signal guard for capacitive touch sensor input 6.

Bit 4 - CS5_SG_EN - Enables the signal guard for capacitive touch sensor input 5.

Bit 3 - CS4_SG_EN - Enables the signal guard for capacitive touch sensor input 4.

Bit 1 - CS2_SG_EN - Enables the signal guard for capacitive touch sensor input 2.

Bit 0 - CS1_SG_EN - Enables the signal guard for capacitive touch sensor input 1.

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5.14 Multiple Touch Configuration Register

TABLE 5-26: MULTIPLE TOUCH CONFIGURATION

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

MULT

_BLK_

EN

Multiple Touch

Config

2Ah

R/W

-

B_MULT_T[1:0]

-

80h

The Multiple Touch Configuration register controls the settings for the multiple touch detection circuitry. These settings

determine the number of simultaneous buttons that may be pressed before additional buttons are blocked and the MULT

status bit is set.

Bit 7 - MULT_BLK_EN - Enables the multiple button blocking circuitry.

• ‘0’ - The multiple touch circuitry is disabled. The device will not block multiple touches.

• ‘1’ (default) - The multiple touch circuitry is enabled. The device will flag the number of touches equal to pro-

grammed multiple touch threshold and block all others. It will remember which sensor inputs are valid and block all

others until that sensor pad has been released. Once a sensor pad has been released, the N detected touches

(determined via the sensing cycle order of CS1 - CS6) will be flagged and all others blocked.

Bits 3 - 2 - B_MULT_T[1:0] - Determines the number of simultaneous touches on all sensor pads before a Multiple Touch

Event is detected and sensor inputs are blocked. The bit decode is given by Table 5-27.

TABLE 5-27: B_MULT_T BIT DECODE

B_MULT_T[1:0]

Number of Simultaneous Touches

1

0

1

0

1

0

1

1 (default)

2

3

4

5.15 Multiple Touch Pattern Configuration Register

TABLE 5-28: MULTIPLE TOUCH PATTERN CONFIGURATION

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Multiple Touch

Pattern Config

COMP_

PTRN

MTP_

ALERT

2Bh

R/W

MTP_ EN

-

MTP_TH[1:0]

00h

The Multiple Touch Pattern Configuration register controls the settings for the multiple touch pattern detection circuitry.

This circuitry works like the multiple touch detection circuitry with the following differences:

1. The detection threshold is a percentage of the touch detection threshold as defined by the MTP_TH[1:0] bits

whereas the multiple touch circuitry uses the touch detection threshold.

2. The MTP detection circuitry either will detect a specific pattern of sensor inputs as determined by the Multiple

Touch Pattern register settings or it will use the Multiple Touch Pattern register settings to determine a minimum

number of sensor inputs that will cause the MTP circuitry to flag an event (see Section 5.16, "Multiple Touch Pat-

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tern Register"). When using pattern recognition mode, if all of the sensor inputs set by the Multiple Touch Pattern

register have a delta count greater than the MTP threshold or have their corresponding Noise Flag Status bits

set, the MTP bit will be set. When using the absolute number mode, if the number of sensor inputs with thresholds

above the MTP threshold or with Noise Flag Status bits set is equal to or greater than this number, the MTP bit

will be set.

3. When an MTP event occurs, all touches are blocked and an interrupt is generated.

4. All sensor inputs will remain blocked so long as the requisite number of sensor inputs are above the MTP thresh-

old or have Noise Flag Status bits set. Once this condition is removed, touch detection will be restored. Note that

the MTP status bit is only cleared by writing a ‘0’ to the INT bit once the condition has been removed.

Bit 7 - MTP_EN - Enables the multiple touch pattern detection circuitry.

• ‘0’ (default) - The MTP detection circuitry is disabled.

• ‘1’ - The MTP detection circuitry is enabled.

Bits 3 - 2 - MTP_TH[1:0] - Determine the MTP threshold, as shown in Table 5-29. This threshold is a percentage of sen-

sor input threshold (see Section 5.19, "Sensor Input Threshold Registers") for inputs enabled in the Active state or of

the standby threshold (see Section 5.24, "Standby Threshold Register") for inputs enabled in the Standby state.

TABLE 5-29: MTP_TH BIT DECODE

MTP_TH[1:0]

Threshold Divide Setting

1

0

1

0

1

0

1

12.5% (default)

25%

37.5%

100%

Bit 1 - COMP_PTRN - Determines whether the MTP detection circuitry will use the Multiple Touch Pattern register as a

specific pattern of sensor inputs or as an absolute number of sensor inputs.

• ‘0’ (default) - The MTP detection circuitry will use the Multiple Touch Pattern register bit settings as an absolute

minimum number of sensor inputs that must be above the threshold or have Noise Flag Status bits set. The num-

ber will be equal to the number of bits set in the register.

• ‘1’ - The MTP detection circuitry will use pattern recognition. Each bit set in the Multiple Touch Pattern register

indicates a specific sensor input that must have a delta count greater than the MTP threshold or have a Noise Flag

Status bit set. If the criteria are met, the MTP status bit will be set.

Bit 0 - MTP_ALERT - Enables an interrupt if an MTP event occurs. In either condition, the MTP status bit will be set.

• ‘0’ (default) - If an MTP event occurs, the ALERT# pin is not asserted.

• ‘1’ - If an MTP event occurs, the ALERT# pin will be asserted.

5.16 Multiple Touch Pattern Register

TABLE 5-30: MULTIPLE TOUCH PATTERN REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Multiple

Touch

Pattern

CS6_

PTRN

CS5_

PTRN

CS4_

PTRN

CS3_

PTRN

CS2_

PTRN

CS1_

PTRN

2Dh

R/W

-

3Fh

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The Multiple Touch Pattern register acts as a pattern to identify an expected sensor input profile for diagnostics or other

significant events. There are two methods for how the Multiple Touch Pattern register is used: as specific sensor inputs

or number of sensor input that must exceed the MTP threshold or have Noise Flag Status bits set. Which method is used

is based on the COMP_PTRN bit (see Section 5.15). The methods are described below.

1. Specific Sensor Inputs: If, during a single sensing cycle, the specific sensor inputs above the MTP threshold or

with Noise Flag Status bits set match those bits set in the Multiple Touch Pattern register, an MTP event is

flagged.

2. Number of Sensor Inputs: If, during a single sensing cycle, the number of sensor inputs with a delta count above

the MTP threshold or with Noise Flag Status bits set is equal to or greater than the number of pattern bits set, an

MTP event is flagged.

For all bits in this register:

• ‘0’ - The specified sensor input is not considered a part of the pattern.

• ‘1’ - The specified sensor input is considered a part of the pattern, or the absolute number of sensor inputs that

must have a delta count greater than the MTP threshold or have the Noise Flag Status bit set is increased by 1.

Bit 5 - CS6_PTRN - Determines whether CS6 is considered as part of the Multiple Touch Pattern.

Bit 4 - CS5_PTRN - Determines whether CS5 is considered as part of the Multiple Touch Pattern.

Bit 3 - CS4_PTRN - Determines whether CS4 is considered as part of the Multiple Touch Pattern.

Bit 2 - CS3_PTRN - Determines whether CS3 is considered as part of the Multiple Touch Pattern.

Bit 1 - CS2_PTRN - Determines whether CS2 is considered as part of the Multiple Touch Pattern.

Bit 0 - CS1_PTRN - Determines whether CS1 is considered as part of the Multiple Touch Pattern.

5.17 Base Count Out of Limit Register

TABLE 5-31: BASE COUNT OUT OF LIMIT REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

BC_

OUT_

6

BC_

OUT_

5

BC_

OUT_

4

BC_

OUT_

3

BC_

OUT_

2

BC_

OUT_

1

Base Count

Out of Limit

2Eh

R

-

00h

The Base Count Out of Limit Register indicates which sensor inputs have base counts out of limit (see Section 4.4, "Sen-

sor Input Calibration"). When these bits are set, the BC_OUT bit is set (see Section 5.2, "Status Registers").

For all bits in this register:

• ‘0’ - The base count for the specified sensor input is in the operating range.

• ‘1’ - The base count of the specified sensor input is not in the operating range.

Bit 5 - BC_OUT_6 - Indicates whether CS6 has a base count out of limit.

Bit 4 - BC_OUT_5 - Indicates whether CS6 has a base count out of limit.

Bit 3 - BC_OUT_4 - Indicates whether CS6 has a base count out of limit.

Bit 2 - BC_OUT_3 - Indicates whether CS3 has a base count out of limit.

Bit 1 - BC_OUT_2 - Indicates whether CS2 has a base count out of limit.

Bit 0 - BC_OUT_1 - Indicates whether CS1 has a base count out of limit.

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5.18 Recalibration Configuration Register

TABLE 5-32: RECALIBRATION CONFIGURATION REGISTERS

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Recalibration

Configuration

BUT_

LD_TH

NO_CLR NO_CLR

_INTD _NEG

NEG_DELTA_

CNT[1:0]

2Fh

R/W

CAL_CFG[2:0]

8Ah

The Recalibration Configuration register controls some recalibration routine settings (see Section 4.4, "Sensor Input

Calibration") as well as advanced controls to program the Sensor Input Threshold register settings.

Bit 7 - BUT_LD_TH - Enables setting all Sensor Input Threshold registers by writing to the Sensor Input 1 Threshold

register.

• ‘0’ - Each Sensor Input X Threshold register is updated individually.

• ‘1’ (default) - Writing the Sensor Input 1 Threshold register will automatically overwrite the Sensor Input Threshold

registers for all sensor inputs (Sensor Input Threshold 1 through Sensor Input Threshold 6). The individual Sensor

Input X Threshold registers (Sensor Input 2 Threshold through Sensor Input 6 Threshold) can be individually

updated at any time.

Bit 6 - NO_CLR_INTD - Controls whether the accumulation of intermediate data is cleared if the noise status bit is set.

• ‘0’ (default) - The accumulation of intermediate data is cleared if the noise status bit is set.

• ‘1’ - The accumulation of intermediate data is not cleared if the noise status bit is set.

APPLICATION NOTE: Bits 5 and 6 should both be set to the same value. Either both should be set to ‘0’ or both

should be set to ‘1’.

Bit 5 - NO_CLR_NEG - Controls whether the consecutive negative delta counts counter is cleared if the noise status bit

is set.

‘0’ (default) - The consecutive negative delta counts counter is cleared if the noise status bit is set.

‘1’ - The consecutive negative delta counts counter is not cleared if the noise status bit is set.

Bits 4 - 3 - NEG_DELTA_CNT[1:0] - Determines the number of negative delta counts necessary to trigger a digital reca-

libration (see Section 4.4.2, "Negative Delta Count Recalibration"), as shown in Table 5-33.

TABLE 5-33: NEG_DELTA_CNT BIT DECODE

NEG_DELTA_CNT[1:0]

Number of Consecutive Negative Delta Count Values

1

0

1

0

1

0

1

8

16 (default)

32

None (disabled)

Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and number of samples of the automatic recalibration routine

(see Section 4.4.1, "Automatic Recalibration"). The settings apply to all sensor inputs universally (though individual sen-

sor inputs can be configured to support recalibration - see Section 5.10.1).

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TABLE 5-34: CAL_CFG BIT DECODE

CAL_CFG[2:0]

Recalibration Samples

Update Time (see

(see Note 5-1)

Note 5-2)

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

16

32

16

32

64

64 (default)

128

256

1024

2048

4096

Note 5-1

Note 5-2

Recalibration Samples refers to the number of samples that are measured and averaged before the

Base Count is updated however does not control the base count update period.

Update Time refers to the amount of time (in sensing cycle periods) that elapses before the Base

Count is updated. The time will depend upon the number of channels enabled, the averaging setting,

and the programmed sensing cycle time.

5.19 Sensor Input Threshold Registers

TABLE 5-35: SENSOR INPUT THRESHOLD REGISTERS

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input 1

Threshold

30h

R/W

-

64

32

16

8

4

2

1

40h

Sensor Input 2

Threshold

31h

32h

33h

34h

35h

R/W

-

64

32

16

8

4

2

1

40h

Sensor Input 3

Threshold

Sensor Input 4

Threshold

Sensor Input 5

Threshold

Sensor Input 6

Threshold

The Sensor Input Threshold registers store the delta threshold that is used to determine if a touch has been detected.

When a touch occurs, the input signal of the corresponding sensor pad changes due to the capacitance associated with

a touch. If the sensor input change exceeds the threshold settings, a touch is detected.

When the BUT_LD_TH bit is set (see Section 5.18 - bit 7), writing data to the Sensor Input 1 Threshold register will

update all of the Sensor Input Threshold registers (31h - 35h inclusive).

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5.20 Sensor Input Noise Threshold Register

TABLE 5-36: SENSOR INPUT NOISE THRESHOLD REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input

Noise Threshold

CS_BN_TH

[1:0]

38h

R/W

-

01h

The Sensor Input Noise Threshold register controls the value of a secondary internal threshold to detect noise and

improve the automatic recalibration routine. If a capacitive touch sensor input exceeds the Sensor Input Noise Threshold

but does not exceed the sensor input threshold, it is determined to be caused by a noise spike. That sample is not used

by the automatic recalibration routine. This feature can be disabled by setting the DIS_DIG_NOISE bit.

Bits 1-0 - CS1_BN_TH[1:0] - Controls the noise threshold for all capacitive touch sensor inputs, as shown in Table 5-37.

The threshold is proportional to the threshold setting.

TABLE 5-37: CSX_BN_TH BIT DECODE

CS_BN_TH[1:0]

Percent Threshold Setting

1

0

1

0

1

0

1

25%

37.5% (default)

50%

62.5%

5.21 Standby Channel Register

TABLE 5-38: STANDBY CHANNEL REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Standby

Channel

CS6_

STBY

CS5_

STBY

CS4_

STBY

CS3_

STBY

CS2_

STBY

CS1_

STBY

40h

R/W

-

00h

The Standby Channel register controls which (if any) capacitive touch sensor inputs are enabled in Standby (see Section

4.3.1.2, "Standby State Sensing Settings").

For all bits in this register:

• ‘0’ (default) - The specified channel will not be monitored in Standby.

• ‘1’ - The specified channel will be monitored in Standby. It will use the standby threshold setting, and the standby

averaging and sensitivity settings.

Bit 5 - CS6_STBY - Controls whether the CS6 channel is enabled in Standby.

Bit 4 - CS5_STBY - Controls whether the CS5 channel is enabled in Standby.

Bit 3 - CS4_STBY - Controls whether the CS4 channel is enabled in Standby.

Bit 2 - CS3_STBY - Controls whether the CS3 channel is enabled in Standby.

Bit 1 - CS2_STBY - Controls whether the CS2 channel is enabled in Standby.

Bit 0 - CS1_STBY - Controls whether the CS1 channel is enabled in Standby.

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5.22 Standby Configuration Register

TABLE 5-39: STANDBY CONFIGURATION REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Standby

Configuration

AVG_

SUM

STBY_SAMP_

TIME[1:0]

STBY_CY_TIME

[1:0]

41h

R/W

STBY_AVG[2:0]

39h

The Standby Configuration register controls averaging and sensing cycle time for sensor inputs enabled in Standby. This

register allows the user to change averaging and sample times on a limited number of sensor inputs in Standby and still

maintain normal functionality in the Active state.

Bit 7 - AVG_SUM - Determines whether the sensor inputs enabled in Standby will average the programmed number of

samples or whether they will accumulate for the programmed number of samples.

• ‘0’ - (default) - The Standby enabled sensor input delta count values will be based on the average of the pro-

grammed number of samples when compared against the threshold.

• ‘1’ - The Standby enabled sensor input delta count values will be based on the summation of the programmed

number of samples when compared against the threshold. Caution should be used with this setting as a touch

may overflow the delta count registers and may result in false readings.

Bits 6 - 4 - STBY_AVG[2:0] - Determines the number of samples that are taken for all Standby enabled channels during

the sensing cycle as shown in Table 5-40. All samples are taken consecutively on the same channel before the next

channel is sampled and the result is averaged over the number of samples measured before updating the measured

results.

TABLE 5-40: STBY_AVG BIT DECODE

STBY_AVG[2:0]

Number Of Samples Taken Per

Measurement

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

2

4

8 (default)

16

32

64

128

Bit 3 - 2 - STBY_SAMP_TIME[1:0] - Determines the time to take a single sample for sensor inputs enabled in Standby

as shown in Table 5-41.

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TABLE 5-41: STBY_SAMP_TIME BIT DECODE

STBY_SAMP_TIME[1:0]

Sampling Time

1

0

1

0

1

0

1

320us

640us

1.28ms (default)

2.56ms

Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the desired sensing cycle time for sensor inputs enabled during Standby,

as shown in Table 5-42. This control is also used to determine programmed cycle time in the Combo state (see Section

4.3.1.3, "Combo State Sensing Settings"). All enabled channels are sampled at the beginning of the sensing cycle. If

additional time is remaining, the device is placed into a lower power state for the remainder of the sensing cycle.

TABLE 5-42: STBY_CY_TIME BIT DECODE

STBY_CY_TIME[1:0]

Programmed Sensing Cycle Time

1

0

1

0

1

0

1

35ms

70ms (default)

105ms

140ms

APPLICATION NOTE: The programmed sensing cycle time (STDBY_CY_TIME[1:0] is only maintained if the actual

time to take the samples is less than the programmed cycle time. The STBY_AVG[2:0] bits

will take priority, so the sensing cycle time will be extended as necessary to accommodate

the number of samples to be measured.

5.23 Standby Sensitivity Register

TABLE 5-43: STANDBY SENSITIVITY REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Standby

Sensitivity

42h

R/W

-

STBY_SENSE[2:0]

02h

The Standby Sensitivity register controls the sensitivity for sensor inputs enabled in Standby.

Bits 2 - 0 - STBY_SENSE[2:0] - Controls the sensitivity for sensor inputs that are enabled in Standby. The sensitivity

settings act to scale the relative delta count value higher or lower based on the system parameters. A setting of 000b is

the most sensitive while a setting of 111b is the least sensitive. At the more sensitive settings, touches are detected for

a smaller delta capacitance corresponding to a “lighter” touch. These settings are more sensitive to noise, however, and

a noisy environment may flag more false touches than higher sensitivity levels.

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APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitivity settings, the

MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch

^{of approximately 0.25% of the base capacitance (or a}C of 25fF from a 10pF base

capacitance). Conversely a value of 1x is the least sensitive setting available. At these

settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts

out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance

^{(or a}C of 3.33pF from a 10pF base capacitance).

TABLE 5-44: STBY_SENSE BIT DECODE

STBY_SENSE[2:0]

Sensitivity Multiplier

2

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

128x (most sensitive)

64x

32x (default)

16x

8x

4x

2x

1x - (least sensitive)

5.24 Standby Threshold Register

TABLE 5-45: STANDBY THRESHOLD REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Standby

Threshold

43h

R/W

-

64

32

16

8

4

2

1

40h

The Standby Threshold register stores the delta threshold that is used to determine if a touch has been detected. When

a touch occurs, the input signal of the corresponding sensor pad changes due to the capacitance associated with a

touch. If the sensor input change exceeds the threshold settings, a touch is detected.

5.25 Sensor Input Base Count Registers

TABLE 5-46: SENSOR INPUT BASE COUNT REGISTERS

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input 1

Base Count

50h

R

128

64

32

16

8

4

2

1

C8h

Sensor Input 2

Base Count

51h

R

128

64

32

16

8

4

2

1

C8h

DS00001569B-page 48

 2013-2015 Microchip Technology Inc.

CAP1296

TABLE 5-46: SENSOR INPUT BASE COUNT REGISTERS (CONTINUED)

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input 3

Base Count

52h

R

128

64

32

16

8

4

2

1

C8h

Sensor Input 4

Base Count

53h

54h

55h

R

128

64

32

16

8

4

2

1

C8h

Sensor Input 5

Base Count

Sensor Input 6

Base Count

The Sensor Input Base Count registers store the calibrated “not touched” input value from the capacitive touch sensor

inputs. These registers are periodically updated by the calibration and recalibration routines.

The routine uses an internal adder to add the current count value for each reading to the sum of the previous readings

until sample size has been reached. At this point, the upper 16 bits are taken and used as the Sensor Input Base Count.

The internal adder is then reset and the recalibration routine continues.

The data presented is determined by the BASE_SHIFT[3:0] bits (see Section 5.5).

5.26 Power Button Register

TABLE 5-47: POWER BUTTON REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

60h

R/W

Power Button

-

PWR_BTN[2:0]

00h

The Power Button Register indicates the sensor input that has been designated as the power button (see Section 4.6,

"Power Button").

Bits 2 - 0 - PWR_BTN[2:0] - When the power button feature is enabled, this control indicates the sensor input to be used

as the power button. The decode is shown in Table 5-48.

TABLE 5-48: PWR_BTN BIT DECODE

PWR_BTN[2:0]

Sensor Input Designated as Power Button

2

1

0

1

0

1

0

1

0

1

0

1

CS1

CS2

CS3

CS4

CS5

CS6

 2013-2015 Microchip Technology Inc.

DS00001569B-page 49

CAP1296

5.27 Power Button Configuration Register

TABLE 5-49: POWER BUTTON CONFIGURATION REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

STBY_

PWR_

EN

Power Button

Configuration

STBY_PWR_

TIME [1:0]

PWR_

EN

61h

R/W

-

PWR_TIME [1:0]

22h

The Power Button Configuration Register controls the length of time that the designated power button must indicate a

touch before an interrupt is generated and the power status indicator is set (see Section 4.6, "Power Button").

Bit 6 - STBY_PWR_EN - Enables the power button feature in the Standby state.

• ‘0’ (default) - The Standby power button circuitry is disabled.

• ‘1’ - The Standby power button circuitry is enabled.

Bits 5 - 4 - STBY_PWR_TIME[1:0] - Determines the overall time, as shown in Table 5-50, that the power button must

be held in the Standby state, in order for an interrupt to be generated and the PWR bit to be set.

Bit 2 - PWR_EN - Enables the power button feature in the Active state.

• ‘0’ (default) - The power button circuitry is disabled in the Active state.

• ‘1’ -The power button circuitry is enabled in the Active state.

Bits 1 - 0 - PWR_TIME[1:0] - Determines the overall time, as shown in Table 5-50, that the power button must be held

in the Active state, in order for an interrupt to be generated and the PWR bit to be set.

TABLE 5-50: POWER BUTTON TIME BITS DECODE

PWR_TIME[1:0] / STBY_PWR_TIME[1:0]

Power Button Touch Hold Time

1

0

1

0

1

0

1

280ms

560ms

1.12 sec (default)

2.24 sec

5.28 Sensor Input Calibration Registers

TABLE 5-51: SENSOR INPUT CALIBRATION REGISTERS

Addr

Register

R/W

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input 1

Calibration

B1h

R

CAL1_9

CAL1_8

CAL1_7

CAL1_6

CAL1_5

CAL1_4

CAL2_4

CAL3_4

CAL4_4

CAL1_3

CAL2_3

CAL3_3

CAL4_3

CAL1_2

00h

Sensor Input 2

Calibration

B2h

B3h

B4h

R

CAL2_9

CAL3_9

CAL4_9

CAL2_8

CAL3_8

CAL4_8

CAL2_7

CAL3_7

CAL4_7

CAL2_6

CAL3_6

CAL4_6

CAL2_5

CAL3_5

CAL4_5

CAL2_2

CAL3_2

CAL4_2

00h

Sensor Input 3

Calibration

Sensor Input 4

Calibration

DS00001569B-page 50

 2013-2015 Microchip Technology Inc.

CAP1296

TABLE 5-51: SENSOR INPUT CALIBRATION REGISTERS (CONTINUED)

Addr

Register

R/W

B7

B6

B5

B4

B3

B2

B1

B0

Default

Sensor Input 5

Calibration

B5h

R

CAL5_9

CAL5_8

CAL5_7

CAL5_6

CAL5_5

CAL5_4

CAL5_3

CAL5_2

00h

Sensor Input 6

Calibration

B6h

B9h

R

CAL6_9

CAL4_1

CAL6_8

CAL4_0

CAL6_7

CAL3_1

CAL6_6

CAL3_0

CAL6_5

CAL2_1

CAL6_4

CAL2_0

CAL6_3

CAL1_1

CAL6_2

CAL1_0

00h

Sensor Input

Calibration LSB

1

Sensor Input

Calibration LSB

2

BAh

R

-

CAL6_1

CAL6_0

CAL5_1

CAL5_0

00h

The Sensor Input Calibration registers hold the 10-bit value that represents the last calibration value. The value rep-

resents the capacitance applied to the internal sensing circuits to balance the capacitance of the sensor input pad. Min-

imum (000h) and maximum (3FFh) values indicate analog calibration failure (see Section 4.4, "Sensor Input

Calibration").

5.29 Calibration Sensitivity Configuration Registers

TABLE 5-52: CALIBRATION SENSITIVITY CONFIGURATION REGISTERS

Addr

Register

R/W

B7

B6

B5

B4

B3

B2

B1

B0

Default

Calibration

Sensitivity

Config 1

80h

R/W

CALSEN4[1:0]

CALSEN3[1:0]

CALSEN2[1:0]

CALSEN6[1:0]

CALSEN1[1:0]

CALSEN5[1:0]

00h

Calibration

Sensitivity

Config 2

81h

R/W

-

00h

CALSENx[1:0] - Controls the gain used by the calibration routine to enable sensor inputs to be more sensitive for prox-

imity detection. Gain is based on capacitance touch pad capacitance ranges, as shown in Table 5-53. Since each sensor

input can have a different pad capacitance, each sensor input has a control.

TABLE 5-53: CALSENX BIT DECODE

CALSENx[1:0]

Capacitive Touch Pad Capacitance

Gain

Range

1

0

1

0

1

0

1

2

4

5-50pF (default)

0-25pF

0-12.5pF

 2013-2015 Microchip Technology Inc.

DS00001569B-page 51

CAP1296

5.30 Product ID Register

TABLE 5-54: PRODUCT ID REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

Product ID

CAP1296-1

FDh

R

0

1

0

1

0

1

69h

The Product ID register stores a unique 8-bit value that identifies the device.

5.31 Manufacturer ID Register

TABLE 5-55: VENDOR ID REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

FEh

R

Manufacturer ID

0

1

0

1

0

1

5Dh

The Vendor ID register stores an 8-bit value that represents MCHP.

5.32 Revision Register

TABLE 5-56: REVISION REGISTER

Addr

R/W

Register

B7

B6

B5

B4

B3

B2

B1

B0

Default

FFh

R

Revision

0

00h

The Revision register stores an 8-bit value that represents the part revision.

DS00001569B-page 52

 2013-2015 Microchip Technology Inc.

CAP1296

6.0

6.1

PACKAGE INFORMATION

CAP1296 Package Drawings

FIGURE 6-1:

CAP1296 PACKAGE DRAWING - 10-PIN DFN 3MM X 3MM

 2013-2015 Microchip Technology Inc.

DS00001569B-page 53

CAP1296

FIGURE 6-2:

CAP1296 PACKAGE DIMENSIONS - 10-PIN DFN 3MM X 3MM

FIGURE 6-3:

CAP1296 PCB LAND PATTERN AND STENCIL - 10-PIN DFN 3MM X 3MM

DS00001569B-page 54

 2013-2015 Microchip Technology Inc.

CAP1296

FIGURE 6-4:

CAP1296 PCB DETAIL A - 10-PIN DFN 3MM X 3MM

 2013-2015 Microchip Technology Inc.

DS00001569B-page 55

CAP1296

FIGURE 6-5:

CAP1296 PCB DETAIL B - 10-PIN DFN 3MM X 3MM

DS00001569B-page 56

 2013-2015 Microchip Technology Inc.

CAP1296

FIGURE 6-6:

CAP1296 LAND DIMENSIONS - 10-PIN DFN 3MM X 3MM

 2013-2015 Microchip Technology Inc.

DS00001569B-page 57

CAP1296

FIGURE 6-7:

CAP1296 14-LEAD PLASTIC SMALL OUTLINE, NARROW, 3.90 MM BODY (SOIC)

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

DS00001569B-page 58

 2013-2015 Microchip Technology Inc.

CAP1296

FIGURE 6-7:

CAP1296 14-LEAD PLASTIC SMALL OUTLINE, NARROW, 3.90 MM BODY (SOIC)

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

 2013-2015 Microchip Technology Inc.

DS00001569B-page 59

CAP1296

FIGURE 6-7:

CAP1296 14-LEAD PLASTIC SMALL OUTLINE, NARROW, 3.90 MM BODY (SOIC)

ꢀꢁꢂꢃꢄ ꢀꢁꢂꢃꢄꢅꢆꢃꢇꢁ ꢄꢃꢈ!ꢂꢂꢆꢉꢄꢃꢊꢋꢈ"ꢋꢌꢆꢃ#ꢂꢋ$ꢍꢉꢌ %ꢃꢊꢎꢆꢋ ꢆꢃ ꢆꢆꢃꢄꢅꢆꢃꢏꢍꢈꢂꢁꢈꢅꢍꢊꢃ&ꢋꢈ"ꢋꢌꢍꢉꢌꢃꢐꢊꢆꢈꢍ'ꢍꢈꢋꢄꢍꢁꢉꢃꢎꢁꢈꢋꢄꢆ#ꢃꢋꢄꢃ

ꢅꢄꢄꢊ())$$$ꢑꢇꢍꢈꢂꢁꢈꢅꢍꢊꢑꢈꢁꢇ)ꢊꢋꢈ"ꢋꢌꢍꢉꢌ

DS00001569B-page 60

 2013-2015 Microchip Technology Inc.

CAP1296

FIGURE 6-8:

CAP1296 PACKAGE MARKING

Line 1 – Device Code, Week

2 9 W W

N N N A

Line 2 – Alphanumeric Traceability Code

Pb-Free JEDEC® designator for Matte Tin (Sn)

PIN 1

H 4 W W

N N N A

Line 1 – Device Code, Week

Line 2 – Alphanumeric Traceability Code

Pb-Free JEDEC® designator for Matte Tin (Sn)

PIN 1

TOP

Line 1 – Device Code, Week

2x 0.6

2 9 W W

N N N A

e4

Line 2 – Alphanumeric Traceability Code

PB-FREE/GREEN SYMBOL

(Ni/Pd PP-LF)

PIN 1

Lines 1-2: Center Horizontal Alignment

Line 3: As Shown

BOTTOM

Bottom marking not allowed

TOP

Line 1 – Device Code, Week

Line 2 – Alphanumeric Traceability Code

2x 0.6

H 4 W W

N N N A

e4

PB-FREE/GREEN SYMBOL

(Ni/Pd PP-LF)

PIN 1

Lines 1-2: Center Horizontal Alignment

Line 3: As Shown

BOTTOM

Bottom marking not allowed

 2013-2015 Microchip Technology Inc.

DS00001569B-page 61

CAP1296

APPENDIX A: DEVICE DELTA

A.1

Delta from CAP1106 to CAP1296

The CAP1296 is pin- and register-compatible with the CAP1106, with the exception of the ALT_POL

bit.

1. Revision ID set to 00h.

2. Added Power Button feature (see Section 4.6, "Power Button").

3. Added ACAL_FAIL bit to flag analog calibration failures (see Section 5.2, "Status Registers") and

ACAL_FAIL_INT bit to control analog calibration failure interrupts (see Section 5.6, "Configuration

Registers").

4. Added BC_OUT bit to flag calibration failures regarding base counts out of limit (see Section 5.2,

"Status Registers") and BC_OUT_RECAL and BC_OUT_INT bit to control base count out of limit

behavior and interrupts (see Section 5.6, "Configuration Registers"). Added Base Count Out of

Limit Register to indicate which sensor inputs have base counts outside the operating range (see

Section 5.17, "Base Count Out of Limit Register").

5. New Combo state has been added which allows some sensors programmed to use the Active state

settings and other sensors programmed to use the Standby state settings to function at the same

time (see Section 4.3.1.3, "Combo State Sensing Settings").

6. Added an option for a signal guard that is overloaded with the CS2 pin. This signal guard is

configured to power a ground shield for improved signal in certain applications (see Section 4.5.1,

"Signal Guard").

7. Increased supply voltage range for 5V operation.

8. Increased operating temperature range from 0°C - 85°C to -40°C to 125°C.

9. Removed ALERT pin configuration (ALT_POL bit).

10. Register additions are shown in Table A-1, "Register Delta".

TABLE A-1:

REGISTER DELTA

Address

Register Delta

Delta

Default

Added C_GAIN[1:0] and COMBO bits.

Changed function of GAIN[1:0] bits if

COMBO bit is set.

00h

Page 26

Added bits - Main

Control Register

00h

Added bit 4 PWR for new Power Button

feature. Added bit 5 ACAL_FAIL to

indicate analog calibration failure. Added

bit 6 BC_OUT.

02h

Page 28

Added bits - General

Status Register

00h

Renamed Calibration

Activate and Status

Register and added

functionality

In addition to forcing a calibration, the

register also indicates the status of

calibration for each sensor input.

26h

Page 37

29h

Page 39

New - Signal Guard

Enable Register

new register for Signal Guard feature

new register for calibration status

00h

2Eh

Page 42

New - Base Count Out

of Limit Register

Added and removed

bits - Configuration 2

Register

Added bit 1 ACAL_FAIL_INT. Added bit 4

BC_OUT_INT. Changed bit 6 from

ALT_POL to BC_OUT_RECAL.

44h

Page 31

40h

DS00001569B-page 62

 2013-2015 Microchip Technology Inc.

CAP1296

TABLE A-1:

Address

REGISTER DELTA (CONTINUED)

Register Delta

Delta

Default

60h

Page 49

New - Power Button

new register for Power Button feature

00h

Register

61h

Page 50

New - Power Button

Configuration Register

new register for configuring the Power

Button feature

00h

69h

00h

80h

Page 51

Added - Calibration

Sensitivity Config 1

new register for proximity

New product ID for CAP1296

Revision changed.

81h

Page 51

Added - Calibration

Sensitivity Config 2

FDh

Page 52

Changed - Product ID

FFh

Page 52

Changed - Revision

Register

 2013-2015 Microchip Technology Inc.

DS00001569B-page 63

CAP1296

7.0

REVISION HISTORY

TABLE 7-1:

REVISION HISTORY

Revision Level and Date

Section/Figure/Entry

Correction

DS00001569B (11-17-15)

Added 14-lead SOIC packages, SOIC pinout

diagrams, package marking.

Updated ordering information.

CAP1296 Revision A replaces the previous SMSC version Revision 1.0

DS00001569B-page 64

 2013-2015 Microchip Technology Inc.

CAP1296

THE MICROCHIP WEB SITE

Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make

files and information easily available to customers. Accessible by using your favorite Internet browser, the web site con-

tains the following information:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s

guides and hardware support documents, latest software releases and archived software

• General Technical Support – Frequently Asked Questions (FAQ), technical support requests, online discussion

groups, Microchip consultant program member listing

• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of semi-

nars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive

e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or

development tool of interest.

To register, access the Microchip web site at www.microchip.com. Under “Support”, click on “Customer Change Notifi-

cation” and follow the registration instructions.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales

offices are also available to help customers. A listing of sales offices and locations is included in the back of this docu-

ment.

Technical support is available through the web site at: http://www.microchip.com/support

 2013-2015 Microchip Technology Inc.

DS00001569B-page 65

CAP1296

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO.

Device

[X]

XX

[XX]

-

Examples:

a)

CAP1296-1-AIA-TR

Address

Option

Package

Tape and Reel

Option

0b0101_000[r/w] Address

10-pin DFN package

Device:

CAP1296

b)

CAP1296-2-SL-TR

0b0101_001[r/w] Address

Tape and Reel

Option

TR

Tape and Reel

14-pin SOIC package

(2)

Package:

AIA 10-pin DFN

SL 14-pin SOIC

Note 1: Tape and Reel identifier only appears in the

catalog part number description. This iden-

tifier is used for ordering purposes and is

not printed on the device package. Check

with your Microchip Sales Office for pack-

age availability with the Tape and Reel

option.

2: For other small form-factor package avail-

ability and marking information, please

visit www.microchip.com/packaging or

contact your local sales office.

DS00001569B-page 66

 2013-2015 Microchip Technology Inc.

CAP1296

Note the following details of the code protection feature on Microchip devices:

•

Microchip products meet the specification contained in their particular Microchip Data Sheet.

•

Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

•

There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

•

Microchip is willing to work with the customer who is concerned about the integrity of their code.

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be

superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO

REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,

MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Micro-

chip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold

harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or

otherwise, under any Microchip intellectual property rights unless otherwise stated.

Trademarks

The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck,

MediaLB, MOST, MOST logo, MPLAB, OptoLyzer, PIC, PICSTART, PIC³²logo, RightTouch, SpyNIC, SST, SST Logo, SuperFlash and

UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

The Embedded Control Solutions Company and mTouch are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit Serial

Programming, ICSP, Inter-Chip Connectivity, KleerNet, KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK,

MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, RightTouch logo, REAL ICE, SQI, Serial

Quad I/O, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of

Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.

GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in

other countries.

All other trademarks mentioned herein are property of their respective companies.

ISBN: 9781632779984

Microchip received ISO/TS-16949:2009 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

QUALITYꢀMANAGEMENTꢀꢀSYSTEMꢀ

CERTIFIEDꢀBYꢀDNVꢀ

and India. The Company’s quality system processes and procedures

are for its PIC^®MCUs and dsPIC^®DSCs, KEELOQ^®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

== ISO/TSꢀ16949ꢀ==ꢀ

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

 2013-2015 Microchip Technology Inc.

DS00001569B-page 67

Worldwide Sales and Service

AMERICAS

ASIA/PACIFIC

EUROPE

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://www.microchip.com/

support

Asia Pacific Office

China - Xiamen

Tel: 86-592-2388138

Fax: 86-592-2388130

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Suites 3707-14, 37th Floor

Tower 6, The Gateway

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Tel: 86-756-3210040

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Tel: 45-4450-2828

Fax: 45-4485-2829

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Tel: 852-2943-5100

Fax: 852-2401-3431

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Tel: 91-80-3090-4444

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Tel: 33-1-69-53-63-20

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Web Address:

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Tel: 91-11-4160-8631

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Tel: 678-957-9614

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Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

China - Hangzhou

Tel: 86-571-8792-8115

Fax: 86-571-8792-8116

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Korea - Seoul

Cleveland

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

China - Hong Kong SAR

Tel: 852-2943-5100

Fax: 852-2401-3431

Poland - Warsaw

Tel: 48-22-3325737

Independence, OH

Tel: 216-447-0464

Fax: 216-447-0643

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Sweden - Stockholm

Tel: 46-8-5090-4654

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Detroit

Novi, MI

UK - Wokingham

Tel: 44-118-921-5800

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Tel: 248-848-4000

Fax: 44-118-921-5820

Houston, TX

Tel: 281-894-5983

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Indianapolis

Noblesville, IN

Tel: 317-773-8323

Fax: 317-773-5453

China - Shenzhen

Tel: 86-755-8864-2200

Fax: 86-755-8203-1760

Taiwan - Hsin Chu

Tel: 886-3-5778-366

Fax: 886-3-5770-955

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Taiwan - Kaohsiung

Tel: 886-7-213-7828

Taiwan - Taipei

Tel: 886-2-2508-8600

Fax: 886-2-2508-0102

New York, NY

Tel: 631-435-6000

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

San Jose, CA

Tel: 408-735-9110

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

Canada - Toronto

Tel: 905-673-0699

Fax: 905-673-6509

07/14/15

 2013-2015 Microchip Technology Inc.

DS00001569B-page 68


型号：	CAP1296-2-SL-TR
厂家：	MICROCHIP
描述：	6-Channel Capacitive Touch Sensor with Proximity 光电二极管
文件：	总68页 (文件大小：834K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

CAP1296-2-SL-TR [MICROCHIP]

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