MPR083EJ_技术文档

MPR083

Rev 2, 04/2008

Freescale Semiconductor

Technical Data

Product Preview

Proximity Capacitive Touch

Sensor Controller

MPR083 OVERVIEW

MPR083

Capacitive Touch

Sensor Controller

The MPR083 is an Inter-Integrated Circuit Communication (I²C) driven

Capacitive Touch Sensor Controller, optimized to manage an 8-position

rotary shaped capacitive array. The device can accommodate a wide

range of implementations through 3 output mechanisms, and many

configurable options.

Bottom View

Features

•

1.8 V to 3.6 V operation

41 µA average supply current with 1 s response time

2 µA Standby Current

Variable low power mode response time (32 ms – 4 s)

Rejects unwanted multi-key detections from EMI events such as PA

bursts or user handling

16-LEAD QFN

CASE 1679

•

Ongoing pad analysis and detection is not reset by EMI events

Data is buffered in a FIFO for shortest access time

IRQ output advises when FIFO has data

System can set interrupt behavior as immediate after event, or

program a minimum time between successive interrupts

Current rotary position is always available on demand for polling-

based systems

16-LEAD TSSOP

CASE 948F

•

Top View

Sounder output can be enabled to generate key-click sound when

rotary is touched

Two hardware selectable I²C addresses allowing two devices on a

16 15 14 13

single I²C bus

E5

12

1

•

Configurable real-time auto calibration

5 mm x 5 mm x 1 mm 16 lead QFN package

-40°C to +85°C operating temperature range

ATTN

MPR083

11 E6

2

IRQ

VDD

3

4

10

9

E7

E8

Implementations

VSS

•

Control Panels

Switch Replacements

Rotary and Linear Sliders

5

6

7

8

Typical Applications

•

Appliances

1

2

3

4

5

6

7

8

16

PC Peripherals

Access Controls

MP3 Players

Remote Controls

Mobile Phones

ATTN

E1

E2

E3

E4

E5

E6

E7

E8

15

14

13

12

11

10

9

IRQ

VDD

MPR083

VSS

SCL

ORDERING INFORMATION

SDA

Device Name Temperature Range

Case Number

Rotary Slider

AD0

MPR083Q

1679

SOUNDER

(16-Lead QFN)

-40°C to +85°C

8-Positions

Figure 1. Pin Connections

MPR083EJ

948F

(16-Lead TSSOP)

This document contains a product under development. Freescale Semiconductor reserves the right to change or

discontinue this product without notice.

Preliminary

1

Device Overview

1.1

Introduction

Freescale Semiconductor’s MPR083 proximity capacitive touch sensor controller is one of a family of products designed to detect

the state of capacitive touch pads. The MPR083 offers designers a cost-efficient alternative to mechanical rotary switches for

control panel applications.

The MPR083 uses an I²C interface to communicate with the host which configures the operation and an interrupt to advise the

host of status changes. The MPR083 includes a piezo sounder drive which provides audible feedback to simulate mechanical

key clicks. The MPR08X family has several implementations to use in your design including control panels and switch

replacements. The MPR083 controls rotary and linear sliders. Other members of the MPR08X family are well suited for other

application interface situations such as individual touch pads or rotary/touch pad combinations.

Freescale offers a broad portfolio of proximity sensors for products ranging from appliance control panels to portable electronics.

Target markets include consumer, appliance, industrial, medical and computer peripherals.

1.1.1 Devices in the MPR08X series

The MPR08X series of Proximity Capacitive Touch Sensor Controllers allows for a wide range of applications and

implementations. Each of the products in Table 1 perform a different application specific task and are optimized for this specific

functionality.

Table 1. MPR08X family Overview

Product

MPR083

MPR084

Bus

I²C

Sounder

Rotary/Slider

Touch Pad Array

Yes

8-positions

—

I²C

Yes

—

8 keys

1.1.2 Internal Block Diagram

The MPR083 consists of primary functional blocks; Interrupt Controller, I²C Serial Interface, Sounder Controller, Configuration

and Status registers, Rotary Position Decoder, Magnitude Comparator and Recalibrator, EMI Burst/Noise Rejection Filter,

Capacitance Measurement Analog Front End. Each of these blocks will be described in detail in their respective sections.

MASKS

INTERRUPT

IRQ

SET

CONTROLLER

RATE

1

CLEAR

2

8

SDA

SCL

2

I C

SERIAL

INTERFACE

ROTARY

3

7

POSITION

8

ATTN

AD0

6

4

5

SOUNDER

DRIVER

CONTROLLER

SOUNDER

8 POSITION ROTARY

Figure 2. Functional Block Diagram

MPR083

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1.1.3 Terminology

The following terms are used to describe front panel interface and capacitive touch sensor technology throughout this document.

Table 2. Terminology

Term

Touch Sensor

Definition

A Touch Sensor is the combination of a Touch Sensor Controller and a connected conductive area

referred to as an electrode.

Touch Sensor Controller A Touch Sensor Controller is the intelligent part of a Touch Sensor which measures capacitance and

differentiates between touched and untouched pads.

Key

A Key or Switch is a mechanical device that makes an electrical connection only when pressed.

Touch Pad

A Touch Pad is a type of capacitive sensor that is used for direct replacement of a Key. A capacitive

touch sensor determines touch state by differentiating between high and low capacitances. When

there is a change in the state this can be interpreted in the same way as a mechanical Key.

Encoder

Rotary

Slider

An Encoder is a group of touch pads arranged in a circular shape where the state of each touch pad

is used to determine the direction of rotation around the touch pads.

A Rotary is a group of touch pads arranged in a circular shape where the state of each touch pad is

interpreted as an angle along the touch pads.

A Slider is a group of touch pads arranged in a row where the state of each touch pad is used to

determine the position along the length of the touch pads.

Solid Pad

Split Pad

A Solid or Full Pad is a type of touch pad where exactly one electrode is used

A Split Pad is a type of touch pad where more than one electrode is used. Split Pads are used to

increase the total number of possible touch pads without increasing the electrical connections to the

Touch Sensor Controller.

N-key Lockout

N-key rollover

N-Key Lockout refers to the logic that determines how many keys can be simultaneously touched in

a system. For example, 1-key lockout would only allow a single key to be touched before ignoring

all future touches.

N-Key Rollover refers to the logic that determines how many keys can be pressed in succession

without releasing previous keys. For example, a system with 1-key lockout and 2-key rollover would

allow 2-keys to be pressed in succession but would only report the second key once the first key

was released.

I²C

Inter-Integrated Circuit Communication

MPR083

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2

External Signal Description

2.1

Device Pin Assignment

Table 3 shows the pin assignment for the MPR083. For a more detailed description of the functionality of each pin, refer to the

appropriate chapter.

Table 3. Device Pin Assignment

Name

Function

1

ATTN

Attention Pin. Input, active low when asserted sets the Configuration Register’s DCE bit high

allowing communication with the part.

2

3

4

5

IRQ

VDD

VSS

SCL

Interrupt Request Pin. Output, active-low, open-drain interrupt request signaling new events.

Positive Supply Voltage

Ground

I²C Serial Clock

I²C Serial Data

6

SDA

7

8

AD0

Address input. Low = slave address 0x4C. High = slave address 0x4D.

Sounder driver output. Connect a piezo sounder from this output to ground. Output is push-pull

SOUNDER

9 - 16 E1, E2, E3, E4, E5, Rotary Electrode connections.

E6, E7, E8

PAD

Exposed pad

Exposed pad on package underside (QFN only). Connect to VSS.

The two packages available for the MPR083 are a 5x5mm 16 pin QFN and a 4x5mm 16 pin TSSOP. Both of the packages and

their respective pinouts are shown in Figure 3.

16 15 14 13

ATTN

E1

E2

E3

E4

E5

E6

E7

E8

16

15

1

E5

12

1

IRQ

VDD

2

3

4

5

6

ATTN

11 E6

14

13

2

3

IRQ

VSS

VDD

10

9

E7

E8

SCL

12

11

10

9

VSS

4

SDA

5

6

7

8

AD0

7

8

SOUNDER

QFN

TSSOP

Figure 3. Package Pinouts

2.2

Recommended System Connections

The MPR083 Capacitive Touch Sensor Controller requires ten external passive components. When connecting the MPR083 in

a touch sensor system, the electrode lines must have pull-up resistors. The recommended value for these pull-ups is 780kΩ.

Some electrode arrays will require higher or lower values depending on the application.

In addition to the 8 resistors, a bypass capacitor of 10µF should always be used between the VDD and VSS lines and a 4.7 Ωk

pull-up resistor should be included on the IRQ.

MPR083

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4

Freescale Semiconductor

The remaining 5 connections are SCL, SDA, IRQ, ATTN, and SOUNDER. Depending on the specific application, each of these

control lines can be used by connecting them to a host system. In the most minimal system, the SCL and SDA must be connected

to a master I²C interface to communicate with the MPR083. All of the connections for the MPR083 are shown by the schematic

in Figure 4.

V

DD

V

DD

ELECTRODE

ARRAY

780kΩ 780kΩ 780kΩ 780kΩ 780kΩ 780kΩ 780kΩ 780kΩ

4.7kΩ

ATTN

IRQ

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

E1

E2

E3

E4

E5

E6

E7

E8

GND

ATTN

E1

E2

E3

E4

E5

E6

E7

E8

V

DD

IRQ

VDD

VSS

1μF

SCL

SDA

SCL

SDA

AD0

SOUNDER

GND

9

MPR083

GND

8-POSITION

ROTARY

Figure 4. Recommended System Connections Schematic

Note that in this configuration the AD0 address line is tied high thus the slave address of the MPR083 0x4D. Alternatively the

address line can be pulled low if the host system needs the MPR083 to be on address 0x4C. This functionality can also be used

to incorporate two MPR083 devices in the same system.

2.3

Serial Interface

The MPR083 uses an I²C Serial Interface. The I²C protocol implementation and the specifics of communicating with the Touch

Sensor Controller are detailed in the following sections.

2.3.1 Serial-Addressing

The MPR083 operates as a slave that sends and receives data through an I²C 2-wire interface. The interface uses a serial data

line (SDA) and a serial clock line (SCL) to achieve bi-directional communication between master(s) and slave(s). A master

(typically a microcontroller) initiates all data transfers to and from the MPR083, and generates the SCL clock that synchronizes

the data transfer.

The MPR083 SDA line operates as both an input and an open-drain output. A pull-up resistor, typically 4.7kΩ, is required on SDA.

The MPR083 SCL line operates only as an input. A pull-up resistor, typically 4.7kΩ, is required on SCL if there are multiple

masters on the 2-wire interface, or if the master in a single-master system has an open-drain SCL output.

Each transmission consists of a START condition (Figure 5) sent by a master, followed by the MPR083’s 7-bit slave address plus

R/W bit, a register address byte, one or more data bytes, and finally a STOP condition.

SDA

t

BUF

t

SU DAT

SU STA

t

HD STA

t

SU STO

HD DAT

t

LOW

SCL

t

HIGH

t

HD STA

t

R

F

START

CONDITION

REPEATED START

CONDITION

STOP START

CONDITION CONDITION

Figure 5. Wire Serial Interface Timing Details

MPR083

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2.3.2 Start and Stop Conditions

Both SCL and SDA remain high when the interface is not busy. A master signals the beginning of a transmission with a START (S)

condition by transitioning SDA from high to low while SCL is high. When the master has finished communicating with the slave,

it issues a STOP (P) condition by transitioning SDA from low to high while SCL is high. The bus is then free for another

transmission.

SDA

DATA LINE STABLE

SCL

DATA VALID

CHANGE OF

DATA ALLOWED

Figure 6. Start and Stop Conditions

2.3.3 Bit Transfer

One data bit is transferred during each clock pulse (Figure 7). The data on SDA must remain stable while SCL is high.

SDA

SCL

S

P

START

CONDITION

STOP

CONDITION

Figure 7. Bit Transfer

2.3.4 Acknowledge

The acknowledge bit is a clocked 9^thbit (Figure 8) which the recipient uses to handshake receipt of each byte of data. Thus each

byte transferred effectively requires 9 bits. The master generates the 9^thclock pulse, and the recipient pulls down SDA during

the acknowledge clock pulse, such that the SDA line is stable low during the high period of the clock pulse. When the master is

transmitting to the MPR083, the MPR083 generates the acknowledge bit because the MPR083 is the recipient. When the

MPR083 is transmitting to the master, the master generates the acknowledge bit because the master is the recipient.

START

CONDITION

CLOCK PULSE FOR

ACKNOWLEDGEMENT

SCL

1

2

8

9

SDA

BY TRANSMITTER

S

SDA

BY RECEIVER

Figure 8. Acknowledge

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2.3.5 The Slave Address

The MPR083 has a 7-bit long slave address (Figure 9). The bit following the 7-bit slave address (bit eight) is the R/W bit, which

is low for a write command and high for a read command.

SDA

1

0

1

0

R/W

ACK

MSB

SCL

Figure 9. Slave Address

The MPR083 monitors the bus continuously, waiting for a START condition followed by its slave address. When a MPR083

recognizes its slave address, it acknowledges and is then ready for continued communication.

2.3.6 Message Format for Writing the MPR083

A write to the MPR083 comprises the transmission of the MPR083’s keyscan slave address with the R/W bit set to 0, followed

by at least one byte of information. The first byte of information is the command byte. The command byte determines which

register of the MPR083 is to be written by the next byte, if received. If a STOP condition is detected after the command byte is

received, then the MPR083 takes no further action (Figure 10) beyond storing the command byte. Any bytes received after the

command byte are data bytes.

Command byte is stored on receipt ofSTOP condition

acknowledge from MPR083

D7 D6 D5 D4 D3 D2 D1 D0

SLAVE ADDRESS

COMMAND BYTE

S

0

A

P

R/W

acknowledge from MPR083

Figure 10. Command Byte Received

Any bytes received after the command byte are data bytes. The first data byte goes into the internal register of the MPR083

selected by the command byte (Figure 11).

acknowledge from

MPR083

acknowledge from

MPR083

How command byte and data byte

map into MPR083's registers

D15 D14 D13 D12 D11 D10 D9 D8

COMMAND BYTE

D7 D6 D5 D4 D3 D2 D1 D0

acknowledge from MPR083

SLAVE ADDRESS

A

DATA BYTE

1 byte

A

P

S

0

A

R/W

auto-increment memory

word address

Figure 11. Command and Single Data Byte Received

If multiple data bytes are transmitted before a STOP condition is detected, these bytes are generally stored in subsequent

MPR083 internal registers because the command byte address generally auto-increments (Section 2.4).

2.3.7 Message Format for Reading the MPR083

The MPR083 is read using the MPR083’s internally stored command byte as address pointer, the same way the stored command

byte is used as address pointer for a write. The pointer generally auto-increments after each data byte is read using the same

rules as for a write (Section 6.4.1). Thus, a read is initiated by first configuring the MPR083’s command byte by performing a write

(Figure 12). The master can now read ‘n’ consecutive bytes from the MPR083, with the first data byte being read from the register

addressed by the initialized command byte.

MPR083

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When performing read-after-write verification, remember to re-set the command byte’s address because the stored command

byte address will generally have been auto-incremented after the write (Section 2.4).

acknowledge from

MPR083

acknowledge from

MPR083

Howcommand byte and data byte

map into MPR083's registers

D15 D14

D12

D10 D9 D8

D11

D13

D7 D6 D5 D4 D3 D2 D1 D0

acknowledge from MPR083

SLAVE ADDRESS

1

COMMAND BYTE

DATA BYTE

n bytes

S

A

P

R/W

auto-increment memory

word address

Figure 12. ‘n’ Data Bytes Received

2.3.8 Operation with Multiple Master

The application should use repeated starts to address the MPR083 to avoid bus confusion between I²C masters.On a I²C bus,

once a master issues a start/repeated start condition, that master owns the bus until a stop condition occurs. If a master that does

not own the bus attempts to take control of that bus, then improper addressing may occur. An address may always be rewritten

to fix this problem. Follow I²C protocol for multiple master configurations.

2.3.9 Device Reset

The RST is an active-low software reset. This is implemented in the Configuration Register by activating the RST bit. When

asserted, the device clears any transaction to or from the MPR084 on the serial interface and configures the internal registers to

the same state as a power-up reset (Table 4). The MPR084 then waits for a START condition on the serial interface.

The sensor controller is capable of operating down to 1.8 V, however, in order for the sensor controller to exit reset and startup

correctly the host system must initially provide 2.0 V to 3.6 V input to V_DDand then follow the process in Figure 13. This process

is required in applications that require regulated operation in the 1.8 V to 2.0 V range. In the case that the application uses an

unregulated battery, then the battery must initially provide at least 2.0 V to correctly power-up the sensor controller which limits

battery selection to the 2.0 V to 3.6 V range.

Apply 2.0V to V Max

DD

To Sensor Controller

Idle Delay Loop

False

Established Comms with

Sensor Controller?

i.e. Read from FIFO

Is Data valid? (0 x 40)

True

Lower V

to the desired operating voltage

1.8 V to 2.0 V

DD

Figure 13. Low Voltage (1.8 V - 2.0 V) Power-up Sequence

MPR083

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2.4

Register Address Map

The MPR083 is a peripheral that is controlled and monitored though a small array of internal registers which are accessed

through the I²C bus. When communicating with the MPR083 each of the registers in Table 4 are used for specific tasks. The

functionality of each specific register is detailed in the following sections.

Table 4. Register Address Map

Register

Burst Mode

Auto-Increment Address

Register Address

FIFO Register

Fault Register

0x00

0x01

0x02

0x03

0x04

0x05

0x06

0x07

0x08

0x09

0x0A

0x0B

0x00

0x02

0x00

0x04

0x05

0x06

0x07

0x08

0x09

0x0A

0x00

0x0B

Rotary Status Register

Rotary Configuration Register

Sensitivity Threshold Register

Master Tick Period Register

Touch Acquisition Sample Period Register

Sounder Configuration Register

Low Power Configuration Register

Stuck Key Timeout Register

Configuration Register

Sensor Information Register

MPR083

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3

Touch Detection

3.1

Introduction

When using a capacitive touch sensor system the raw data must be filtered and interpreted. This process can be done many

different ways but the method used in the MPR083 is explained in this chapter.

3.2

Understanding the Basics

The rotary interface has to distinguish touch status through varying user conditions (different finger sizes in bare hands or gloves)

and environmental conditions (electrical and RF noise, sensor contamination with dirt or moisture).

The rotary circuitry reports touch status as one of the following two conditions:

1. Rotary untouched

2. Rotary touched in one of eight positions.

The rotary is only touched in one position, ideally near the middle of one of the eight pads. If a touch occurs between pads,

untouched will be reported.

3.3

Conditional Output Scenarios

Since it is unlikely that in a real world case a single independent touch will occur two specific multi-touch response cases are

outlined. Methods for changing the sensitivity of the device will be discussed in another Chapter, but the important part is that the

sensitivity is determined by the strength of an input signal. If more than one input signal is above the selected sensitivity then the

touch sensor controller interprets this in a specific way. This functionality is broken down into two different cases.

3.3.1 Simultaneous Touches

Any time two touches are detected at the same time the touch sensor controller recognizes this case and accounts for it. Any

time more than one key is pressed the touches are ignored. Thus the touch sensor controller will show the rotary as untouched.

In most cases one of the two electrodes will receive a stronger signal than the other. If the difference in capacitance is statistically

significant between the pad with the stronger signal will be reported.

This functionality is sometimes called 1-Key Lockout.

3.3.2 Sequential Touches

Another case is when one rotary pad is touched and held and a second rotary pad is then touched and held. For this situation

the second touch will be ignored and the first touch will continue to be reported.

If the second touch is released before the first touch then the second touch will be completely ignored. But, if the first touch is

released before the second then the system will report that the first key is released and that the second key is now touched. This

functionality is sometimes called 2-Key Rollover.

3.4

Rotary Configuration Register

The Rotary Configuration Register configures a variety of the MPR083 features. Each of these features is described in following

sections. The I²C slave address of the Rotary Configuration Register is 0x03.

7

RSE

1

6

0

5

0

4

ACE

0

3

RRBE

0

2

RTBE

0

1

0

RE

1

R

W

Reset:

0

= Unimplemented

Figure 14. Rotary Configuration Register

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Table 5. Rotary Configuration Register Field Descriptions

Field

Description

7

Rotary Sounder Enable – The Rotary Sounder Enable bit controls if data is sent to

RSE

the sounder.

0 Disable – Click Feedback Off

1 Enable – Click Feedback On

4

Auto Calibration Enable – The Auto Calibration Enable bit enables or disables the

ACE

auto calibration function.

0 Disable

1 Enable

3

Rotary Release Buffer Enable – The Rotary Release Buffer Enable bit determines

whether or not data is logged in the FIFO when the rotary transitions from a touched

to untouched state.

RRBE

0 Disable – No Release Data Logged

1 Enable – Release Data Logged

2

Rotary Touch Buffer Enable – The Rotary Touch Buffer Enable bit determines

whether or not data is logged in the FIFO any time a button is pressed.

0 Disable – Touches are not logged

RTBE

1 Enable – Touches are logged

0

RE

Rotary Enable – The Rotary Enable bit enables or disables the touch sensor. When

disabled, no touches are detected.

0 Disable – Touches not detected

1 Enable – Touches detected

3.5

Touch Acquisition Sample Period Register

The Touch Acquisition Sample Period Register is used to determine the electrode scan period of the system. The I²C slave

address of the Touch Acquisition Sample Period Register is 0x06.

7

0

6

5

4

0

3

2

1

0

R

W

TASP

Reset:

0

1

= Unimplemented

Figure 15. Touch Acquisition Sample Period Register

Table 6. Touch Acquisition Sample Register Field Description

Field

Description

7:0

TASP

Touch Acquisition Sample Period – The Touch Acquisition Sample Period Field

selects or reports the multiplication factor that is used to determine how often

electrodes are scanned. The resulting factor must be in the range 1 to 32. If the

value is outside of this range the TASP will be set to 00011111.

00000000 Encoding 0 – Sets the TASP multiplication factor to 1

~

00011111 Encoding 31 – Sets the TASP multiplication factor to 32.

MPR083

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4

Modes of Operation

4.1

Introduction

The operating modes of the MPR083 are described in this section. Implementation and functionality of each mode are described.

The Modes of Operation of the MPR083 combine to form a suite of quick response and low power consumption functionality. This

is achieved through 2 Run modes and 2 Stop Modes. The two modes are enabled by toggling the Configuration Register’s DCE

and RUNE bits as shown in Table 7. Note that while in a run mode, the only register that can be written to is the Configuration

Register. Thus, when changes to registers are needed, enter Stop1 mode, write to the registers and change the mode to “Run”.

Table 7. Mode Enable Register Bits

Mode

Run1

Run2

Stop1

Stop2

RUNE

DCE

1

0

1

0

1

0

4.2

Initial Power Up

On power-up, the interrupt output IRQ is reset, and IRQ will go high. The registers are reset to the values shown in Table 8.

Table 8. Power-Up Register Configurations

Register Function

FIFO Register

Power-Up Condition

FIFO is empty

Register Address

HEX Value

0x00

0x01

0x02

0x03

0x40

0x00

0x81

Fault Register

No faults

Rotary Status Register

Rotary Configuration Register

Rotary is untouched

Rotary is enabled, without interrupts, with

sounder enabled and Auto-Cal Disabled

Sensitivity Threshold Register

Master Tick Period Register

Maximum sensitivity

0x04

0x05

0x06

0x00

0x05

0x01

Master clock period is 10ms

TASP is 1 master tick period

Touch Acquisition Sample Period

Register

Sounder Configuration Register

Low Power Configuration Register

Stuck Key Timeout Register

Configuration Register

Sounder is globally enabled, 10ms of 1kHz

Low Power Mode is disabled

0x07

0x08

0x09

0x0A

0x0B

0x01

0x00

0x14

0xFF

Stuck key detector disabled

Stop1 Mode. IRQ is disabled

Sensor Information Register

Fixed SensorInfo based on revision

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4.3

Run1 Mode

When in Run1 mode the sensor controller will run continuously. During Run1 all the modules are synchronized by the Master Tick

Period. This value can be set by using the Master Tick Period Register as outlined in the following section.

While in this mode all functionality of the MPR083 is enabled; touch detection will occur, and I²C communication will be available.

This mode is enabled by setting the Configuration Register’s RUNE and DCE bits high.

4.3.1 Master Tick Period Register

The Master Tick Period Register is used to set the master tick of this system. All parts of the system are synchronized to this

counter. This register is overridden in all modes except for Run1. When not in Run1 mode, the value of this register is ignored

and 8ms is used for the primary clock. The I²C slave address of the Master Tick Period Register is 0x05.

7

6

5

4

3

2

1

0

R

W

MTP

Reset:

0

1

0

1

= Unimplemented

Figure 16. Master Tick Period Register

Table 9. Master Tick Period Register Field Descriptions

Field

Description

7:0

MTP

Master Tick Period – The Master Tick Period selects or reports the current value of the

touch sensor controller’s primary clock multiplier. The resulting period must be in the

range 5ms to 31ms. If the value is outside of this range the MTP will be set to 00011010.

00000000 Encoding 0 – Sets the primary clock multiplier to 5

~

00011010 Encoding 26 - Sets the primary clock multiplier to 31

4.4

Run2 Mode

When in Run2 mode the sensor controller will continue to scan the electrodes but a low power state will be enabled between

each cycle. Because of this, any I²C communication that occurs, may or may not respond while the sensor is in this mode.

If DCE is enabled the sensor controller transitions between low power and active states. During the active part of the cycle

communication with the sensor controller is possible; however, Freescale always requires users to issue an ATTN signal prior to

initiating communications. Accessing the I²C interface while DCE mode is enabled without sending an ATTN signal first is likely

to produce invalid data.

This mode is enabled by setting the Configuration Register’s RUNE bit high and DCE bit low. The only way to exit this mode is

to toggle the Attention Pin, refer to Section 4.7.

4.5

Stop1 Mode

When in Stop1 mode the sensor controller will not scan the electrodes. While capacitance sensing is disabled I²C

communications will still be accepted and the sensor controller will maintain instantaneous response to all register requests. This

is the only mode in which register values can be set.

This mode is enabled by setting the Configuration Register’s RUNE bit low and DCE bit high.

4.6

Stop2 Mode

When in Stop2 mode the sensor controller will not scan the electrodes or accept I²C communication. The MPR083 is off during

this mode.

This mode is enabled by setting the Configuration Register’s RUNE bit low and DCE bit low. The only way to exit this mode is to

toggle the Attention Pin, refer to Section 4.7.

MPR083

Preliminary

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Freescale Semiconductor

13

4.7

Configuration Register

The Configuration Register allows a user to reset the part, adjust Interrupt settings, and change the mode. The I²C slave address

of the Configuration Register is 0x0A.

7

0

6

5

4

3

0

2

DCE

1

IRQEN

0

RUNE

0

R

W

RST

Reset:

0

1

0

= Unimplemented

Figure 17. Configuration Register

Table 10. Configuration Register Field Descriptions

Field

Description

7:5

Interrupt Rate – The Interrupt Rate Field selects the amount to multiply the MTP by

to determine the minimum delay between sequential Interrupts.

000 Encoding 0 – Sets the IRQR multiplication factor to 1

~

IRQR

111 Encoding 7 – Sets the IRQR multiplication factor to 8

4

Reset – Asserts a global reset of the sensor controller.

0 Reset Asserted

1 Reset Not Asserted

RST

2

Duty Cycle Enable – The Duty Cycle Enable bit enables or disables duty cycling on

the MPR083. This bit is active low.

0 Duty Cycle Enabled (2 modes)

DCE

1 Duty Cycle Disabled (1 modes)

1

Interrupt Enable – The Interrupt Enable bit enables or disables the IRQ

Functionality.

0 IRQ Disabled

1 IRQ Enabled

IRQEN

0

Run Mode Enable – The Run Mode Enable bit enables or disables scanning of the

electrodes for touch detection. This bit is active high.

0 Electrode Scanning Disabled (Stop modes)

RUNE

1 Electrode Scanning Enabled (Run modes)

4.8

Attention Pin

The Attention (ATTN) pin allows a user to externally set the Configuration Register’s DCE bit high. This is latched on a high to

low transition. Since the current mode of the device is enabled through the DCE this will cause duty cycling to be disabled and

change the current mode from Run2 to Run1, or Stop2 to Stop1 (depending on the previous state).

When in Run2 or Stop2 modes this is the only way to enable the I²C communication.

MPR083

Preliminary

Sensors

14

Freescale Semiconductor

5

Low Power Configuration

5.1

Introduction

The MPR083 features a Low Power mode that can reduce the power consumption into the microamps range. This feature can

be used to both adjust the response time of the system, and change the conditions on which Low Power would be enabled.

5.2

Operation

This Low Power configuration is only active when the sensor controller is in Run2 mode. The Low Power mode decreases current

consumption by increasing the response time of the MPR083. This increase is controlled through two factors.

During normal Run2 operation of the sensor controller the Max Response Time (MRT) is calculated by taking the product of the

TASP and the primary clock. From Chapter 4 the primary clock is the (MTP + 5) ms. Since the sensor controller is in Run2, the

primary clock is also multiplied by a factor of 8. The debounce rate of the MPR083 is 4 times the sample rate thus the MRT is

represented by the following equation.

MTP + 5

⎛

⎝

⎞

---------------------

MRT₁=

+ 1 × TASP × 4 × 8ms

Equation 1

⎠

8

First, the Idle Interface Timeout (IIT) represents the total time the touch interface should remain idle before going into Low Power

mode. This value can be calculated by taking the product of the ITP, TASP and primary clock (8ms) with a factor of 64. Thus the

IIT is represented as follows:

MTP + 5

⎛

⎝

⎞

---------------------

MRT₂=

+ 1 × TASP × SCD × 4 × 8ms

Equation 2

⎠

8

Second, the Max Response Time (MRT) represents the total time the touch interface should remain inactive before scanning the

electrodes. This value can be calculated by taking the product of the SCD, TASP and primary clock (8ms) with a factor of 5. Thus

the MRT is represented as follows:

MTP + 5

⎛

⎝

⎞

---------------------

ITT =

+ 1 × TASP × ITP × 6 × 8ms

Equation 3

⎠

8

When in Run2 mode, the sensor controller will initially scan the electrodes at the rate of MRT₁. When scanning at MRT₁and the

touch interface remains idle for the IIT period then the scan period will change to MRT₂. When scanning at MRT₂and a touch is

detected the scan rate will transition back to MRT₁.

LP DISABLED

ITT PERIOD

MRT

2

run2 SET

1

TOUCH DETECTED

Figure 18. Low Power Scan Period Transition Diagram

MPR083

Preliminary

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Freescale Semiconductor

15

5.3

Configuration

Low Power Configuration is achieved through setting two values; the Idle Timeout Period and the Sleep Cycle Duration. This

functionality is described in the following section.

5.3.1 Low Power Configuration Register

The Low Power Configuration register is used to set both the Idle Timeout Period and Sleep Cycle Duration multiplication factors.

The I²C slave address of the Low Power Configuration Register is 0x08.

7

6

ITP

0

5

4

3

2

SCD

0

1

0

R

W

Reset:

0

= Unimplemented

Figure 19. Low Power Configuration Register

Table 11. Low Power Configuration Register Field Descriptions

Field

Description

7:5

ITP

Idle Timeout Period – The Idle Timeout Period selects the amount to multiply the

TASP (touch acquisition sample period) by to determine the idle interface timeout

(IIT) period of the sensor controller.

000 Encoding 0 – Disables Low Power Mode

001 Encoding 1 – Sets the ITP multiplication factor to 1

~

111 Encoding 7 – Sets the ITP multiplication factor to 7

4:0

SCD

Sleep Cycle Duration – The Sleep Cycle Duration Field selects the amount to

multiply the TASP (touch acquisition sample period) by to determine the Sleep

period of the sensor controller.

00000 Encoding 0 – Disables Low Power Mode

00001 Encoding 1 – Sets the SCD multiplication factor to 1

~

11111 Encoding 31 – Sets the SCD multiplication factor to 31

MPR083

Preliminary

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Freescale Semiconductor

16

6

Output Mechanisms

6.1

Introduction

The MPR083 has three primary methods for reporting data in addition to an IRQ output that is described in Chapter 7. The three

output systems are described in this section.

6.2

Instantaneous

The Instantaneous output shows the current status of the user interface. This information is displayed in terms of the current

rotary position that is touched. Only one touch can be shown at a time.

6.2.1 Rotary Status Register

The Rotary Status Register is a read only register for determining the current status of the rotary. The I²C slave address of the

Rotary Status Register is 0x02.

7

0

6

0

5

0

4

3

2

1

0

R

W

SF

CP

Reset:

0

= Unimplemented

Figure 20. Rotary Status Register

Table 12. Rotary Status Register Field Descriptions

Field

Description

4

SF

Status Flag – The Status Flag shows when the rotary is currently detecting a touch.

0 Rotary is not currently detecting a touch

1 Rotary is currently detecting a touch

3:0

CP

Current Position – The Current Position represents the electrode that is currently

being touched.

0000 Encoding 0 – Electrode 1 is currently touched

~

0111 Encoding 7 – Electrode 8 is currently touched

6.3

Buffered

The Buffered output is done through a FIFO. The FIFO will buffer every touch that occurs up to 30 values before the buffer

overflows and data is lost. Any time data is read from the FIFO it is pulled from the buffer and the next item becomes available.

The buffer can be cleared (NDF goes high) by either reading the last entry or attempting to write to the register.

The buffer settings are configured in the Rotary Configuration Register as described in Section 3.4.

6.3.1 FIFO Register

The FIFO Register is a read only register for determining the current status of the rotary. Any time a write is issued to this register

the buffer will be cleared. The I²C slave address of the FIFO Register is 0x00.

7

6

5

4

3

2

1

0

R

W

MDF

NDF

OF

TRF

BP

Reset:

0

1

0

= Unimplemented

Figure 21. FIFO Register

MPR083

Preliminary

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Freescale Semiconductor

17

Table 13. FIFO Register Field Descriptions

Field

Description

7

More Data Flag – The More Data Flag shows whether or not data will remain in the

MDF

buffer after the current read.

0 No Data Remaining

1 Data Remaining

6

No Data Flag – The No Data Flag shows whether or not there is currently data in

NDF

the buffer.

0 Buffer currently has data

1 Buffer does not currently have data

5

OF

Overflow Flag – The Overflow Flag shows whether or not an overflow has occurred.

If this flag is high then the most current data was lost.

0 No Overflow has occurred

1 Overflow has occurred

4

Touch Release Flag – The Touch Release Flag shows if the current buffer entry is

TRF

a touch or release of a pad.

0 Pad is released

1 Pad is touched

3:0

BP

Buffered Position – The Buffered Position represents the electrode number that is

currently being displayed by the buffer.

0000 Encoding 0 – Buffered touch of electrode 1

~

0111 Encoding 7 – Buffered touch of electrode 8

6.4

Error

The MPR083 can generate a fault under two conditions; an electrode is shorted to VDD, or an electrode is shorted to VSS. Once

a fault is asserted the sensor electrodes will no longer be scanned until the fault is cleared. In the event of multiple faults occurring

at the same time, the sensor controller will report the first fault that is detected during scanning.

6.4.1 Fault Register

The Fault Register is a read only register that shows the fault number under the current sensor conditions. Any write to the Fault

Register will clear the register, when in Stop mode. The Fault register cannot be cleared when the part is in a Run mode. The I²C

slave address of the Fault Register is 0x01.

7

0

6

0

5

0

4

0

3

0

2

0

1

0

R

W

FAULT

Reset:

0

= Unimplemented

Figure 22. Fault Register

Table 14. Fault Register Field Descriptions

Field

Description

1:0

FAULT

Fault – The Fault code represents the currently asserted fault condition.

00 Encoding 0 – No fault detected

01 Encoding 1 – Short to VSS detected

10 Encoding 2 – Short to VDD detected

MPR083

Preliminary

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Freescale Semiconductor

18

7

Interrupts

7.1

Introduction

The MPR083 has one interrupt output that is configured by registers and alerts the application when a touch or fault is detected.

When running in Run2 or Stop2 mode where I²C communication is not available this feature alerts the user to sensor touches.

7.2

Condition for Interrupt

There are two cases that latch the Interrupt buffered data available or fault detected.

7.2.1 Buffered Data Available

The interrupt for Buffered Data Available will only trigger when the NDF (No Data Flag) transitions from high to low. This signifies

that there is new data available in the buffer. The interrupt is deasserted on the first read/write of the FIFO Register and cannot

be reasserted for buffered data until the FIFO is empty (either by reading all the data, or clearing the buffer).

7.2.2 Fault Detected

The interrupt for a fault detected condition is triggered any time the Fault condition in the Fault Register transitions from zero to

non-zero. The interrupt is deasserted when the Fault Register is cleared (by writing to the Fault Register).

7.3

Settings

Interrupts are configured through I²C using the Configuration Register (Section 4.7). Two of the settings in this register will affect

the interrupt functionality.

The Interrupt Enable (IRQEN) must be set high for the IRQ to be enabled. When low, all interrupts will be ignored, and the IRQ

pin will never latch.

The Interrupt Rate (IRQR) sets the minimum delay between sequential triggered interrupts. The minimum interrupt period can be

calculated by taking the product of the (MTP + 5) and IRQR with a factor of 4. Thus, for the minimum setting an interrupt would

be triggered no more often than 4 times the master clock.

MinInterruptPeriod(ms) = (MTP + 5) × IRQR × 4

If the MPR083 is using Run2, the minimum interrupt period would be represented by the following equation.

MTP + 5

Equation 4

⎛

⎝

⎞

---------------------

MinInterruptPeriod(ms) =

+ 1 × 8 × IRQR × 4

Equation 5

⎠

8

7.4

IRQ Pin

The IRQ pin is an open-drain, latching interrupt output which requires an external pull-up resistor. The pin will latch down based

on the conditions in Section 6.2. The pin will reset when an I²C transmission reads/writes the appropriate register displaying

information about the source of the interrupt. Thus if the source is buffered data available then a FIFO Buffer read/write will clear

the IRQ pin. If the source is a fault detected then a write of the Fault Register will clear the pin.

MPR083

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19

7.4.1 IRQ Pin Timing

The MinInterruptPeriod is implemented as a hold off of IRQ latching per Figure 23 and Figure 24. In the first case the

MinInterruptPeriod is longer than the interval between sequential interrupt source events, thus it delays the IRQ from latching

until the MinInterruptPeriod has elapsed.

Second Interrupt Event

Initial Interrupt Event

MinInterruptPeriod

IRQ

Figure 23. IRQ Timing Diagram - Case 1

In the second case the MinInterruptPeriod is shorter than the interval between sequential interrupt source events, thus the IRQ

latches as it normally would without additional delay.

Initial Interrupt Event

Second Interrupt Event

MinInterruptPeriod

IRQ

Figure 24. IRQ Timing Diagram - Case 2

MPR083

Preliminary

Sensors

20

Freescale Semiconductor

8

Calibration

8.1

Introduction

The MPR083 is self-calibrating. This is done both at initial start-up of the device and during run time.

8.2

Initial Start-up Conditions

Initial calibration of the MPR083 occurs every time the device resets. The first key detection cycle is used as a baseline

capacitance value for all remaining calculations. Thus, a touch is detected by taking the difference between this baseline value

and the current capacitance on the electrode.

8.3

Auto-Calibration

The MPR083 has an auto-calibration feature. This is enabled through the Rotary Configuration Register (Section 3.4), by setting

the ACE bit high. Auto calibration is done by two mechanisms. The basic auto-calibration will recalculate the baseline value after

6 sample periods. Thus the auto calibrate period can be calculate by multiplying the master clock period (in milliseconds) and the

touch acquisition sample period with a factor of 64.

AutoCalibrationPeriod(ms) = MCP × TASP × 64

Equation 6

If a touch is currently being detected the auto-calibration will not engage and calibration will be ignored. The device can also be

calibrated when a key is being touched, this is controlled by stuck key detection.

8.4

Stuck Key Detection

The Stuck Key Detection system allows the application to specify the maximum amount of time a touch should be detected before

it is calibrated into the baseline and the touch is ignored. This is controlled by setting the Stuck Key Timeout multiplication factor

(SKT). The timeout period can be calculated by multiplying the SKT, master clock period (in ms) and touch acquisition sample

period with a factor of 64.

AutoCalibrationPeriod(ms) = MCP × TASP × SKT × 64

Equation 7

When Stuck Key Detection is off a touched key will remain touched indefinitely and never be calibrated into the baseline value.

8.4.1 Stuck Key Timeout Register

The Stuck Key Timeout Register is used to determine the electrode scan period of the system. The I²C slave address of the Stuck

Key Timeout Register is 0x09.

7

0

6

5

4

3

2

1

0

R

W

SKT

Reset:

0

= Unimplemented

Figure 25. Stuck Key Timeout Register

Table 15. Stuck Key Timeout Register Field Descriptions

Field

Description

7:0

Stuck Key Timeout – The Stuck Key Timeout field selects or reports the

SKT

multiplication factor that is used to determine how often electrodes are calibrated

while a touch is being detected.

00000000 Encoding 0 – Turns off Stuck Key Detection

00000001 Encoding 1 – Sets the SKT multiplication factor to 2

~

11111111 Encoding 255 – Sets the SKT multiplication factor to 256

MPR083

Preliminary

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Freescale Semiconductor

21

9

Sensitivity

9.1

Introduction

The MPR083 can operate in a variety of environments with a variety of different electrode patterns. Because of this it is necessary

to adjust the relative sensitivity of the sensor controller. Usually this requires fine tuning in any final application.

There are many factors that must be taken into account, but much of the time this value is relative to the capacitance changes

generated by a touch. Since capacitance is directly proportional to the dielectric constant of the material and the area of the pad,

while inversely proportional to the distance between pads these are the primary factors.

ke₀A

-----------

C =

Equation 8

d

As the relative capacitance rises the sensitivity setting of the MPR083 should be adjusted accordingly. Thus a very high sensitivity

value represents a large A and a small d.

9.2

Adjusting the Sensitivity

The sensitivity of the MPR083 is adjusted by varying the Sensitivity Threshold Register.

9.2.1 Sensitivity Threshold Register

The sensitivity register allows the sensitivity of the MPR083 to be adjusted for any situation. The I²C slave address of the

Sensitivity Threshold Register is 0x04.

7

0

6

5

4

3

2

1

0

R

W

SL

Reset:

0

= Unimplemented

Figure 26. Sensitivity Threshold Register

Table 16. Sensitivity Threshold Register Field Descriptions

Field

Description

7:0

ST

Sensitivity Threshold – The Sensitivity Threshold selects or reports the sensitivity

setting of the Sensor Controller. The resulting value must be in the range 1 to 64

units. If the value is outside of this range the ST will be set to 00111111.

00000000 Encoding 0 – Sets the sensitivity to level 1

~

00111111 Encoding 63 – Sets the sensitivity to level 64

MPR083

Preliminary

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Freescale Semiconductor

22

10 Additional Features

10.1 Key Click Sound Generator

The Key Click Sound Generator allows the MPR083 to generate audible feedback, independent of the I²C communication status.

The sounder is used to drive a piezo buzzer. This output is configured by using the Sounder Register, shown in the following

section.

10.1.1 Sounder Configuration Register

The I²C slave address of the Sounder Configuration Register is 0x07.

7

0

6

0

5

0

4

0

3

0

2

CP

0

1

FREQ

0

SEN

1

R

W

Reset:

0

= Unimplemented

Figure 27. Sounder Configuration Register

Table 17. Sounder Configuration Register Field Descriptions

Field

Description

2

CP

Click Period – The Click Period bit controls the length of the sounder click.

0 Sounder Click Period is 10ms

1 Sounder Click Period is 20ms

1

Frequency – The Frequency bit controls the frequency of the driven output.

0 Sounder frequency is 1kHz

FREQ

1 Sounder frequency is 2kHz

0

Sounder Enable – The Sounder Enable bit enables or disables the sounder output.

SEN

0 Disable

1 Enable

10.2 Sensor Information

The Sensor Information register is a read only register that displays a descriptor which contains static information about the

MPR083 version.

10.2.1 Sensor Information Register

The I²C slave address of the Sensor Information Register is 0x0B.

7

0

6

5

4

3

0

2

1

0

R

W

SensorInfo

Reset:

1

0

= Unimplemented

Figure 28. Sensor Information Register

Table 18. Sensor Information Register Field Descriptions

Field

Description

7-0

SensorInfo

SensorInfo – The Sensor Information register describes the version information for

the part. Burst reads will display ASCII data in the following format:

VENDOR_LABEL",PN:"PRODUCT_LABEL",QUAL:"BUILD_TYPE_LABEL",VER:"

BUILD_VERSION_MAJOR"_"BUILD_VERSION_MINOR"_"BUILD_NUMBER"\0"

MPR083

Preliminary

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Freescale Semiconductor

23

Appendix A Electrical Characteristics

A.1 Introduction

This section contains electrical and timing specifications.

A.2 Absolute Maximum Ratings

Absolute maximum ratings are stress ratings only, and functional operation at the maxima is not guaranteed. Stress beyond the

limits specified in Table A-1 may affect device reliability or cause permanent damage to the device. For functional operating

conditions, refer to the remaining tables in this section. This device contains circuitry protecting against damage due to high static

voltage or electrical fields; however, it is advised that normal precautions be taken to avoid application of any voltages higher

than maximum-rated voltages to this high-impedance circuit.

Table 19. Absolute Maximum Ratings - Voltage (with respect to VSS)

Rating

Symbol

Value

Unit

Supply Voltage

Input Voltage

V_DD

-0.3 to +3.8

V

V_IN

VSS - 0.3 to VDD + 0.3

V

SCL, SDA, AD0, IRQ, ATTN,

SOUNDER

Operating Temperature Range

Storage Temperature Range

TSG

T_SG

-40 to +85

°C

-55 to +150

A.3 ESD and Latch-up Protection Characteristics

Normal handling precautions should be used to avoid exposure to static discharge.

Qualification tests are performed to ensure that these devices can withstand exposure to reasonable levels of static without

suffering any permanent damage. During the device qualification ESD stresses were performed for the Human Body Model

(HBM), the Machine Model (MM) and the Charge Device Model (CDM).

A device is defined as a failure if after exposure to ESD pulses the device no longer meets the device specification. Complete

DC parametric and functional testing is performed per the applicable device specification at room temperature followed by hot

temperature, unless specified otherwise in the device specification.

Table 20. ESD and Latch-up Test Conditions

Rating

Symbol

Value

Unit

Human Body Model (HBM)

V_ESD

±2000

V

Machine Model (MM)

V_ESD

±200

±500

±100

V

Charge Device Model (CDM)

Latch-up current at T_A= 85°C

I_LATCH

mA

MPR083

Preliminary

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Freescale Semiconductor

24

A.4 DC Characteristics

This section includes information about power supply requirements and I/O pin characteristics.

Table 21. DC Characteristics (Temperature Range = –40°C to 85°C Ambient)

(Typical Operating Circuit, V = 1.8 V* to 3.6 V, T = T

to T

, unless otherwise noted. Typical Current values are at V = 3.3 V,

DD

A

MIN

MAX DD

T = +25°C.)

A

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Operating Supply Voltage

Run1 mode Current

Run2 mode Current

Stop1 mode Current

Stop2 mode Current

V_DD

1.8*

3.6

V

I_run1

I_run2

I_stop1

I_stop2

V_IH

V_DD= 1.8 V

1.62

41

mA

µA

mA

µA

V

1.47

2

Input High Voltage

SDA, SCL

0.7 x VDD

Input Low Voltage

SDA, SCL

V_IL

0.35 x VDD

V

µA

pF

V

Input Leakage Current

SDA, SCL

I_IH, I_IL

0.025

1

7

Input Capacitance

SDA, SCL

Output Low Voltage

SDA, IRQ

V_OL

I_OL= 6mA

0.5V

*The MPR083 requires a specific start-up sequence for V_DD< 2.0 V. Refer to Section 2.3.9.

2

A.5

I C AC Characteristics

This section includes information about I²C AC Characteristics.

Table 22. I²C AC Characteristics

(Typical Operating Circuit, V = 1.8 V to 3.6 V, T = T

to T

, unless otherwise noted. Typical values are at V = 3.3 V,

DD

A

MIN

MAX DD

T = +25°C.)

A

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Serial Clock Frequency ⁽¹⁾

f_SCL

100

kHz

Capacitive Load for Each Bus Line

C_b

400

pF

1. Clock Stretching is required for reliable communications

MPR083

Preliminary

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Freescale Semiconductor

25

Appendix B Brief Register Descriptions

FIFO Register: 0x00

7

6

5

4

3

0

2

0

1

0

R

W

MDF

NDF

OF

TRF

BP

Reset:

0

1

0

= Unimplemented

Fault Register: 0x01

7

0

6

0

5

0

4

0

3

0

2

0

1

0

R

W

FAULT

Reset:

0

= Unimplemented

Rotary Status Register: 0x02

7

6

0

5

0

4

3

0

2

0

1

0

R

W

0

SF

CP

Reset:

0

= Unimplemented

Rotary Configuration Register: 0x03

7

RSE

1

6

0

5

0

4

ACE

0

3

RRBE

0

2

RTBE

0

1

0

RE

1

R

W

Reset:

0

= Unimplemented

Sensitivity Threshold Register: 0x04

7

6

5

0

4

0

3

0

2

0

1

0

R

W

SL

Reset:

0

= Unimplemented

Master Tick Period Register: 0x05

7

6

0

5

0

4

0

3

0

2

1

0

1

R

MTP

W

Reset:

0

= Unimplemented

MPR083

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26

Touch Acquisition Sample Period Register: 0x06

7

6

5

4

0

3

0

2

0

1

0

1

R

W

TASP

Reset:

0

= Unimplemented

Sounder Configuration Register: 0x07

7

0

6

0

5

0

4

0

3

0

2

CP

0

1

FREQ

0

SEN

1

R

W

Reset:

0

= Unimplemented

Low Power Configuration Register: 0x08

7

6

ITP

0

5

0

4

0

3

0

2

SCD

0

1

0

R

W

Reset:

0

= Unimplemented

Stuck Key Timeout Register: 0x09

7

6

0

5

0

4

0

3

0

2

0

1

0

R

SKT

W

Reset:

0

= Unimplemented

Configuration Register: 0x0A

7

6

0

5

0

4

1

3

0

2

DCE

1

IRQEN

0

RUNE

0

R

RST

W

Reset:

0

= Unimplemented

Sensor Information Register: 0x0B

7

6

5

0

4

3

2

0

1

0

1

R

W

SensorInfo

Reset:

0

= Unimplemented

MPR083

Preliminary

Sensors

Freescale Semiconductor

27

Appendix C Ordering Information

C.1 Ordering Information

This section contains ordering information for MPR083Q and MPR083EJ devices.

ORDERING INFORMATION

Device Name

Temperature Range

Case Number

Rotary Slider

MPR083Q

1679

(16-Lead QFN)

-40°C to +85°C

8-Positions

MPR083EJ

948F

(16-Lead TSSOP)

C.2 Device Numbering Scheme

All Proximity Sensor Products have a similar numbering scheme. The below diagram explains what each part number in the

family represents.

P

M

PR EE

X

Package Designator

(Q = QFN, EJ = TSSOP)

Status

(M = Fully Qualified, P = Preproduction)

Version

Proximity Sensor Product

Number of Electrodes

(08 = 8 electrode device)

MPR083

28

Preliminary

Sensors

Freescale Semiconductor

PACKAGE DIMENSIONS

PAGE 1 OF 3

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Preliminary

Sensors

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PACKAGE DIMENSIONS

PAGE 2 OF 3

MPR083

Preliminary

Sensors

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PACKAGE DIMENSIONS

PAGE 3 OF 3

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Preliminary

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PACKAGE DIMENSIONS

PAGE 1 OF 3

MPR083

Preliminary

Sensors

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32

PACKAGE DIMENSIONS

PAGE 2 OF 3

MPR083

Preliminary

Sensors

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33

PACKAGE DIMENSIONS

PAGE 3 OF 3

MPR083

Preliminary

Sensors

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34

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MPR083

Rev.2

04/2008


型号：	MPR083EJ
厂家：	Freescale
描述：	Proximity Capacitive Touch Sensor Controller 接近电容式触摸传感器控制器传感器换能器控制器
文件：	总35页 (文件大小：369K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MPR083EJ [FREESCALE]

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