MPR03XEP_技术文档

MPR03X

Rev 2.0 11/2008

Freescale Semiconductor

Technical Data

Product Preview

Proximity Capacitive Touch

Sensor Controller

MPR03X OVERVIEW

The MPR03X is an Inter-Integrated Circuit Communication (I²C)

driven Capacitive Touch Sensor Controller, optimized to manage two

electrodes with interrupt functionality, or three electrodes with the

interrupt disabled. It can accommodate a wide range of

implementations due to increased sensitivity and a specialized

feature set.

MPR031

MPR032

Capacitive Touch

Sensor Controller

Bottom View

Features

•

8 µA supply current with two electrodes being monitored with

64 ms response time and IRQ enabled

Compact 2 x 2 x 0.65 mm 8-lead µDFN package

Supports up to 3 touch pads

Only one external component needed

Intelligent touch detection capacity

4 µA maximum shutdown current

1.71 V to 2.75 V operation

Threshold based detection with hysteresis

I²C interface, with optional IRQ

Multiple devices in a system allow for up to 6 electrodes (need

MPR032 with second I²C address)

8-PIN UDFN

CASE 1944

•

Top View

IRQ/ELE2

ELE1

1

2

8

SCL

SDA

7

MPR03X

V_SS

V_DD

ELE0

REXT

3

4

6

5

•

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

Implementations

Figure 1. Pin Connections

•

Switch Replacements

Touch Pads

V

DD

Typical Applications

•

PC Peripherals

MP3 Players

Remote Controls

Mobile Phones

Lighting Controls

SCL

²

I C Serial

ELE0

ELE1

1

2

Interface

SDA

MPR03X

INT

REXT

75k

V

SS

V

SS

MPR03X with 2 Electrodes and 2 Pads

ORDERING INFORMATION

I²C Address

0x4A

Device Name

MPR031EP

Temperature Range

-40°C to +85°C

Case Number

Touch Pads

Shipping

1944 (8-Pin UDFN)

3-pads

Bulk

MPR031EPR2

MPR032EP

0x4A

Tape and Reel

Bulk

0x4B

MPR032EPR2

0x4B

Tape and Reel

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

MPR03X is a small outline, low profile, low voltage touch sensor controller in a 2 mm x 2 mm DFN which manages up to three

touch pad electrodes. An I²C interface communicates with the host controller at data rates up to 400 kbits/sec. An optional

interrupt output advises the host of electrode status changes. The interrupt output is a multiplexed with the third electrode output,

so using the interrupt output reduces the number of electrode inputs to two. The MPR03X includes three levels of input signal

filtering to detect pad input condition changes due to touch without any processing by the application.

1.2

Internal Block Diagram

Debounce

Interval

32 kHz

Oscillator

8 MHz

Oscillator

8MHz

SDA

SCL

SDA

SCL

I²C

Interface

Debounce

Count

Shutdown

Debounce

and

Traffic

User

Sample

Interval

Sample

Counters

Registers

32 kHz8 MHz

CLR

Sample

Count

Shutdown

ADC Controller

Interrupt

Controller

Start Conversion

Number of

Electrodes

Set Input Channel

IRQ

IRQ SET

Set Grounded

Electrodes

Un-Touched

Baseline

Filter

Set Source Current

Sample Filter Registers

Max Register

Debounced

Results

Average

Filtered

Debounce Filter Registers

4 x Max Registers

Average

Filtered

Sample

Result

ADC Result

Sum Register

Magnitude

Comparator

Debounce

Result

4 x SumRegisters

4 x Min Registers

Min Register

Iset

Set Source Current

Set Input Channel

3

Mirror

REXT

0V

Current SourceMultiplexor

Select Chan

2

0

1 2

Select

Chan

0

1

2

ELE0

ELE1

ELE2

Enable

Shutdown

Start Conversion

8MHz

Convert

10 Bit ADC

Clock

Data

ADC Result

10

Iref

Sel

Set Grounded

Electrodes

4

Figure 2. Functional Block Diagram

MPR03X

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External Signal Description

2.1

Device Pin Assignment

Table 1 shows the pin assignment for the MPR03X. For a more detailed description of the functionality of each pin, refer to the

appropriate chapter.

Table 1. Device Pin Assignment

Name

Function

I²C Serial Clock Input

1

SCL

I²C Serial Data I/O

Ground

2

3

4

5

SDA

V_SS

V_DD

Positive Supply Voltage

Reference Resistor

REXT

Connect a 75 kΩ ±1% resistor from REXT to V_SS

6

7

8

ELE0

ELE1

Electrode 0

Electrode 1

IRQ/ELE2

Interrupt Output or Touch Electrode Input 2

IRQ is the active-low open-drain interrupt output

The package available for the MPR03X is a 2 x 2 mm 8 pin UDFN. The package and pinout is shown in Figure 3.

IRQ/ELE2

ELE1

1

2

8

7

SCL

SDA

MPR03X

V_SS

V_DD

ELE0

REXT

3

4

6

5

Figure 3. Package Pinouts

2.2

Recommended System Connections

The MPR03X Capacitive Touch Sensor Controller requires one external passive component. As shown in Table 1, the REXT line

should have a 75 kΩ connected from the pin to GND. This resistor needs to be 1% tolerance.

In addition to the one resistor, a bypass capacitor of 10µF should always be used between the V_DDand V_SSlines and a

4.7 kΩ pull-up resistor should be included on the IRQ.

The remaining three connections are SCL, SDA, IRQ. Depending on the specific application, each of these control lines can be

used by connecting them to a host controller. In the most minimal system, the SCL and SDA must be connected to a master I²C

interface to communicate with the MPR03X. All of the connections for the MPR03X are shown by the schematic in Figure 4.

V

DD

1

2

SCL

SDA

ELE0

ELE1

²

I C Serial

Interface

MPR03X

REXT

75k

IRQ/ELE2

3

V

SS

Figure 4. Recommended System Connections Schematic

MPR03X

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2.3

Serial Interface

The MPR03X 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 MPR03X 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 MPR03X, and it generates the SCL clock that synchronizes

the data transfer.

The MPR03X SDA line operates as both an input and an open-drain output. A pull-up resistor, typically 4.7kΩ, is required on

SDA. The MPR03X 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 MPR03X’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

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.

MPR03X

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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 MPR03X, the MPR03X generates the acknowledge bit, since the MPR03X is the recipient. When the MPR03X

is transmitting to the master, the master generates the acknowledge bit, since 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

2.3.5 The Slave Address

The MPR03X 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

1

0

R/W

ACK

MSB

SCL

Figure 9. Slave Address

The MPR03X monitors the bus continuously, waiting for a START condition followed by its slave address. When a MPR03X

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

The MPR031 and MPR032 slave addresses are show in Table 2.

Table 2.

I²C Address

Part Number

MPR031

MPR032

0x4A

0x4B

MPR03X

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2.3.6 Message Format for Writing the MPR03X

A write to the MPR03X comprises the transmission of the MPR03X’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 MPR03X is to be written by the next byte, if received. If a STOP condition is detected after the command byte is

received, the MPR03X 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 MPR03X

D15 D14 D13 D12 D11 D10 D9 D8

SLAVE ADDRESS

COMMAND BYTE

S

0

A

P

R/W

acknowledge from MPR3X

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 MPR03X

selected by the command byte (Figure 11).

acknowledge from

MPR03X

acknowledge from

MPR03X

How command byte and data byte

map into MPR03X's registers

D15 D14 D13 D12 D11 D10 D9 D8

COMMAND BYTE

D7 D6 D5 D4 D3 D2 D1 D0

acknowledge from MPR03X

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

MPR03X internal registers because the command byte address generally auto-increments (Section 2.4).

2.3.7 Message Format for Reading the MPR03X

MPR03X is read using MPR03X's internally stored register address as address pointer, the same way the stored register address

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 (Table 5). Thus, a read is initiated by first configuring MPR03X's register address by performing a write (Figure 10)

followed by a repeated start. The master can now read 'n' consecutive bytes from MPR03X, with first data byte being read from

the register addressed by the initialized register address.

acknowledge from master

D7 D6 D5 D4 D3 D2 D1 D0

acknowledge from MPR03X

SLAVE ADDRESS

R/W

DATA BYTE

n bytes

S

1

A

P

auto-increment memory

word address

Figure 12. Reading MPR03X

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2.3.8 Operation with Multiple Master

The application should use repeated starts to address the MPR03X 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.

2.4

Register Address Map

Table 3. Register Address Map

Burst Mode

Auto-Increment

Address

Register

Register Address

Touch Status Register

0x00

0x02

0x03

0x04

0x05

0x06

0x07

0x1A

0x1B

0x1C

0x26

0x27

0x28

0x29

0x2A

0x2B

0x2C

0x2D

0x2E

0x41

0x43

0x44

ELE0 Filtered Data Low Register

ELE0 Filtered Data High Register

ELE1 Filtered Data Low Register

ELE1 Filtered Data High Register

ELE2 Filtered Data Low Register

ELE2 Filtered Data High Register

ELE0 Baseline Value Register

ELE1 Baseline Value Register

ELE2 Baseline Value Register

Max Half Delta Register

Register Address + 1

Noise Half Delta Register

Noise Count Limit Register

ELE0 Touch Threshold Register

ELE0 Release Threshold Register

ELE1 Touch Threshold Register

ELE1 Release Threshold Register

ELE2 Touch Threshold Register

ELE2 Release Threshold Register

AFE Configuration Register

Filter Configuration Register

Electrode Configuration Register

0x00

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3

Functional Overview

3.1

Introduction

The MPR03X has an analog front, a digital filter, and a touch recognition system. This data interpretation can be done many

different ways but the method used in the MPR03X is explained in this chapter.

3.2

Understanding the Basics

MPR03X is a touch pad controller which manages two or three touch pad electrodes. An I²C interface communicates with the

host, and an optional interrupt output advises the host of electrode status changes. The interrupt output is a multiplexed function

with the third electrode input, so using the interrupt output reduces the number of electrode inputs to two.

The primary application for MPR03X is the management of user interface touch pads. Monitoring touch pads involves detecting

small changes of pad capacitance. MPR03X incorporates a self calibration function which continually adjusts the baseline

capacitance for each individual electrode. Therefore, the host only has to configure the delta thresholds to interpret a touch or

release.

MPR03X uses a state machine to operate a capacitive measurement engine to analyze the electrodes and determine whether a

pad has been touched or released. Between measurements the MPR03X draws negligible current. The application controls

MPR03X's configuration, making trade-offs between noise rejection, touch response time, and power consumption.

3.3

Implementation

The touch sensor system can be tailored to specific applications by varying the following: a capacitance detector, a raw data low

pass filter, a baseline management system, and a touch detection system. In the following sections, the functionality and

configuration of each block will be described.

Electrodes can be connected to the MPR03X in two different configurations, one with an IRQ and one without (Figure 13).

V

DD

1

2

3

ELE0

ELE1

ELE2

SCL

SDA

SCL

SDA

²

I C Serial

²

I C Serial

ELE0

ELE1

1

2

Interface

MPR03X

INT

REXT

75k

V

SS

V

SS

V

SS

MPR03X with 3 Electrodes and 3 Pads

MPR03X with 2 Electrodes and 2 Pads

Figure 13. MPR03X Pad and Interrupt Connection Options

MPR03X

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Modes of Operation

4.1

Introduction

MPR03X’s operation modes are Stop, Run1, and Run2. Stop mode is the start-up and configuration mode.

4.2

Stop Mode

In Stop mode, the MPR03X does not monitor any of the electrodes. This mode is the lowest power state.

4.2.1 Initial Power Up

On power-up, the device is in Stop mode, registers are reset to the initial values shown in Table 4, and MPR03X starts in Stop

mode drawing minimal supply current. The user configurable pin IRQ/ELE2 defaults to being the interrupt output IRQ function.

IRQ is reset on power-up, and so defaults to logic high. Since the IRQ is an open-drain output, IRQ will be high impedance.

Table 4. Power-Up Register Configurations

Register

Touch Status Register

Power-Up Condition

Register Address

HEX Value

Cleared

0x00

0x02

0x03

0x04

0x05

0x06

0x07

0x1A

0x1B

0x1C

0x26

0x27

0x28

0x29

0x2A

0x2B

0x2C

0x2D

0x2E

0x41

0x43

0x00

0x08

0x04

ELE0 Filtered Data Low Register

ELE0 Filtered Data High Register

ELE1 Filtered Data Low Register

ELE1 Filtered Data High Register

ELE2 Filtered Data Low Register

ELE2 Filtered Data High Register

ELE0 Baseline Value Register

ELE1 Baseline Value Register

ELE2 Baseline Value Register

Max Half Delta Register

Max Half Delta set to 1

Noise Half Delta Amount set to 1

Noise Count Limit set to 1

Threshold set to 1

Noise Half Delta Register

Noise Count Limit Register

ELE0 Touch Threshold Register

ELE0 Release Threshold Register

ELE1 Touch Threshold Register

ELE1 Release Threshold Register

ELE2 Touch Threshold Register

ELE2 Release Threshold Register

AFE Configuration Register

Threshold set to 1

6 AFE samples, 16µA charge current

Filter Configuration Register

6 touch detection samples, 16ms

detection sample interval

Electrode Configuration Register

Stop mode. ELE2/IRQ pin is interrupt

function,

0x44

0x00

4.2.2 Stop Mode Usage

In order to set the configuration registers, the device must be in stop mode. This is achieved by setting the EleEn field in the

Electrode Configuration register to zero.

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4.3

Run1 Mode

In Run1 Mode, the MPR03X monitors 1, 2, or 3 electrodes which are connected to a user defined array of touch pads. When only

1 or 2 electrodes are selected, the IRQ/ELE2 pin is automatically configured as an open drain interrupt output.

When 3 electrodes are selected in Run1 Mode, the IRQ/ELE2 pin becomes the third electrode input, ELE2 (Figure 14).

Run1 Mode with 2 Electrodes

Run1 Mode with 3 Electrodes

ELE0

ELE1

ELE0

ELE1

ELE2

1

2

3

1

2

Capacitance

Measurement

Engine

Filters

and

Filters

and

Capacitance

Measurement

Engine

Touch

Detection

Touch

Detection

Interrupt

INT

Run1 Mode with 1 Electrode

Capacitance

Measurement

ELE0

1

Filters

Engine

and

Touch

Detection

Interrupt

INT

Figure 14. Electrode/Pad Connections in Run Mode

4.4

Run2 Mode

In Run2 Mode, all enabled electrodes act as a single electrode by internally connecting the electrode pins together. The entire

surface of all the touch pads is used as a single pad, increasing the total area of the conductor.

When 2 electrodes are selected in Run2 Mode, the IRQ/ELE2 pin is automatically configured as an open drain interrupt output.

When 3 electrodes are selected, the IRQ/ELE2 pin becomes the third electrode input, ELE2 (Figure 15).

Run2 Mode to 3 Pads

Run2 Mode to 2 Pads

ELE0

ELE1

ELE2

ELE0

ELE1

1

2

3

1

2

Capacitance

Measurement

Engine

Filters

and

Filters

and

Touch

Capacitance

Measurement

Engine

Touch

Detection

Interrupt

INT

Figure 15. Electrode/Pad Connections in Area Detection Mode

4.5

Electrode Configuration Register

The Electrode Configuration Register manages the configuration of the Electrode outputs in addition to the mode of the part. The

address of the Electrode Configuration Register is 0x44.

7

0

6

5

4

3

2

1

0

R

W

CalLock ModeSel

EleEn

Reset:

0

= Unimplemented

Figure 16. Electrode Configuration Register

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Table 5. Electrode Configuration Register Field Descriptions

Field

Description

6

Calibration Lock – The Calibration Lock bit selects whether calibration is enabled

or disabled.

CalLock

0 Enabled – In this state baseline calibration is enabled.

1 Disabled – In this state baseline calibration is disabled.

5:4

ModeSel

Mode Select – The Mode Select field selects which Run Mode the sensor will

operate in. This register is ignored when in Stop Mode.

00 Encoding 0 – Run1 Mode is enabled.

01 Encoding 1 – Run2 Mode is enabled.

10 Encoding 2 – Run2 Mode is enabled.

11 Encoding 3 – Run2 Mode is enabled.

3:0

Electrode Enable – The Electrode Enable Field selects the electrode and IRQ

EleEn

functionality.

0000 Encoding 0 – Stop Mode

0001 Encoding 1 – Run Mode with ELE0 is enabled, ELE1 is disabled, IRQ is

enabled.

0010 Encoding 2 – Run Mode with ELE0 is enabled, ELE1 is enabled, IRQ is

enabled.

0011 Encoding 3 – Run Mode with ELE0 is enabled, ELE1 is enabled, ELE2 is

enabled.

~

1111 Encoding 15 – Run Mode with ELE0 is enabled, ELE1 is enabled, ELE2 is

enabled.

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5

Output Mechanisms

5.1

Introduction

The MPR03X has three outputs: the touch status, values from the second level filter (Section 8.3), and the calibrated baseline

values. The application can either use the touch status or a combination of second level filter data with the baseline data to

determine when a touch occurs.

5.2

Touch Status

Each Electrode has an associated single bit that denotes whether or not the pad is currently touched. This output is generated

using the touch threshold and release threshold registers to determine when a pad is considered touched or untouched.

Configuration of this system is discussed in Section 9.

5.2.1 Touch Status Register

The Touch Pad Status Register is a read only register for determining the current status of the touch pad. The I²C slave address

of the Touch Pad Status Register is 0x02.

7

OCF

0

6

0

5

0

4

0

3

0

2

1

0

R

W

E2S

E1S

E0S

Reset:

0

= Unimplemented

Figure 17. Touch Status Register

Table 6. Touch Pad Status Register Field Descriptions

Field

Description

7

OCF

Over Current Flag – The Over Current Flag shows when too much current is on the REXT

pin. If it is set all other status flags and registers are cleared and the device is set to Stop

mode. When OCF is set, the MPR03X cannot be put back into a Run mode.

0 – Current is within limits.

1 – Current is above limits. Writing a 1 to this field will clear the OCF.

2

Electrode 2 Status – The Electrode 2 Status bit shows touched or not touched.

E2S

0 – Not Touched

1 – Touched

1

Electrode 1 Status – The Electrode 1 Status bit shows touched or not touched.

E1S

0 – Not Touched

1 – Touched

0

Electrode 0 Status – The Electrode 0 Status bit shows touched or not touched.

E0S

0 – Not Touched

1 – Touched

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5.3

Filtered Data

Each electrode has an associated filtered output. This output is generated through register settings and a low pass filter

implementation (Section 8.4).

5.3.1 Filtered Data Low Register

The Filtered Data Low register contains the data on each of the electrodes. It is paired with the Filtered Data High register for

reading the 10 bit A/D value. The address of the ELE0 Filtered Data Low register is 0x02. The address of the ELE1 Filtered Data

Low register is 0x04. The address of the ELE2 Filtered Data Low register is 0x06.

7

6

5

4

3

2

1

0

R

W

FDLB

Reset:

0

= Unimplemented

Figure 18. Filtered Data Low Register

Table 7. Filtered Data Low Register Field Descriptions

Field

Description

7:0

Filtered Data Low Byte – The Filtered Data Low Byte displays the lower 8 bits of

FDLB

the 10 bit filtered A/D reading.

00000000 Encoding 0

~

11111111 Encoding 255

5.3.2 Filtered Data High Register

The Filtered Data High register contains the data on each of the electrodes. It is paired with the Filtered Data Low register for

reading the 10 bit A/D value. The address of the ELE0 Filtered Data High register is 0x03. The address of the ELE1 Filtered Data

High register is 0x05. The address of the ELE2 Filtered Data High register is 0x07.

7

0

6

0

5

0

4

0

3

0

2

0

1

0

R

W

FDHB

Reset:

0

= Unimplemented

Figure 19. Filtered Data High Register

Table 8. Filtered Data High Register Field Descriptions

Field

Description

7:0

Filtered Data High Bits – The Filtered Data High Bits displays the higher 2 bits of

FDHB

the 10 bit filtered A/D reading.

00 Encoding 0

~

11 Encoding 3

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5.4

Baseline Values

In addition to the second level filter data, the data from the baseline filter (or third level filter) is also displayed. In this case, the

least two significant bits are removed before the 10-bit value is displayed in the register.

5.4.1 Baseline Value Register

The Baseline Value register contains the third level filtered data on each of the electrodes. It is a truncated 10 bit A/D value

displayed in the 8 bit register. The address of the ELE0 Baseline Value register is 0x1A. The address of the ELE1 Baseline Value

register is 0x1B. The address of the ELE2 Baseline Value register is 0x1C.

7

6

5

4

3

2

1

0

R

W

BV

Reset:

0

= Unimplemented

Figure 20. Filtered Data High Register

Table 9. Filtered Data High Register Field Descriptions

Field

Description

7:0

BV

Baseline Value – The Baseline Value byte displays the higher 8 bits of the 10 bit

baseline value.

00000000 Encoding 0 – The 10 bit baseline value is between 0 and 3.

~

11111111 Encoding 255 – The 10 bit baseline value is between 1020 and 1023.

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6

Interrupts

6.1

Introduction

The MPR03X has one interrupt output that is triggered on any touch related event. The interrupts trigger on both the up or down

motion of a finger as defined by a set of configurable thresholds.

6.2

Triggering an Interrupt

An interrupt is asserted any time data changes in the Touch Status Register (Section 5.2). This means that if an electrode touch

or release occurs, an interrupt will alert the application of the change.

6.3

Interrupt Handling

The MPR03X has one interrupt output that is asserted on any touch related event. The interrupts trigger on both the up or down

motion of a finger as defined by a set of configurable thresholds as described in Section 9. To service an interrupt, the application

must read the Touch Status Register (Section 5.2) and determine the current condition of the system. As soon as an I²C read

takes place the MPR03X will release the interrupt.

6.4

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 de-assert when an I²C transaction reads from the MPR03X.

MPR03X

Preliminary

Sensors

Freescale Semiconductor

15

7

Theory of Operation

7.1

Introduction

The MPR03X utilizes the principle that a capacitor holds a fixed amount of charge at a specific electric potential. Both the

implementation and the configuration will be described in this section.

7.2

Capacitance Measurement

The basic measurement technique used by the MPR03X is to charge up the capacitor C on one electrode input with a DC current

I for a time T (the charge time). Before measurement, the electrode input is grounded, so the electrode voltage starts from 0 V

and charges up with a slope, Equation 1, where C is the pad capacitance on the electrode (Figure 21). All of the other electrodes

are grounded during this measurement. At the end of time T, the electrode voltage is measured with a 10 bit ADC. The voltage

is inversely proportional to capacitance according to Equation 2.The electrode is then discharged back to ground at the same

rate it was charged.

dV

dt

I

Equation 1

=

C

I ×T

C

Equation 2

V =

Electrode voltage measured here

V

Electrode

Charging

Electrode

Discharging

Electrode Charge Time

Electrode Discharge Time

2T

T

Figure 21. MPR03X Electrode Measurement Charging Pad Capacitance

When measuring capacitance there are some inherent restrictions due to the methodology used. On the MPR03X the voltage

after charging must be in the range that is shown in Figure 22.

Valid ADC Values vs. V

DD

900

800

ADChigh

700

600

ADCmid

500

400

ADClow

300

200

100

0

1.71

1.91

2.11

2.31

2.51

2.71

V

(V)

DD

Figure 22.

MPR03X

Preliminary

Sensors

Freescale Semiconductor

16

The valid operating range of the electrode charging source is 0.7V to (V_DD-.7)V. This means that for a given V_DDthe valid ADC

(voltage visible to the digital interface) range is given by

,

Equation 3

.7

V_DD

and

ADC_low

=

(

1024

)

(

V_DD−.7

V_DD

)

1024

.

Equation 4

ADC_high

=

(

)

These equations are represented in the graph. In the nominal case of V_DD= 1.8V the ADC range is shown below in Table 10.

Table 10.

VDD

ADChigh

ADClow

ADCmid

1.8

625.7778

398.2222

512

Any ADC counts outside of the range shown are invalid and settings must be adjusted to be within this range. If capacitance

variation is of importance for an application after the current output, charge time and supply voltage are determined then the

following equations can be used. The valid range for capacitance is calculated by using the minimum and maximum ADC values

in the capacitance equation. Substituting the low and high ADC equations into the capacitance equation yields the equations for

the minimum and maximum capacitance values which are

and

.

Equation 5

I ×T

V_DD− .7

I ×T

.7

C_low

=

C_high

=

7.3

Sensitivity

The sensitivity of the MPR03X is relative to the capacitance range being measured. Given the ADC value, current and time

settings capacitance can be calculated,

.

Equation 6

I ×T ×1024

V_DD× ADC

C =

For a given capacitance the sensitivity can be measured by taking the derivative of this equation. The result of this is the

following equation, representing the change in capacitance per one ADC count, where the ADC in the equation represents the

current value.

dC

I ×T ×1024

V_DD× ADC²

= −

Equation 7

dADC

This relationship is shown in the following graph by taking the midpoints off all possible ranges by varying the current and time

settings. The midpoint is assumed to be 512 for ADC and the nominal supply voltage of 1.8V is used.

MPR03X

Preliminary

Sensors

Freescale Semiconductor

17

Sensitivity vs. Midpoint Capacitance for V

= 1.8 V

DD

500

1000

1500

2000

2500

0

-0.5

-1

dC/dADC @cmid (pF/1 ADC Count)

-1.5

-2

-2.5

-3

-3.5

-4

-4.5

-5

Midpoint Capacitance (pF)

Figure 23.

Smaller amounts of change indicate increased sensitivity for the capacitance sensor. Some sample values are shown in Table 11.

Table 11.

pF

10

Sensitivity (pF/ADC count)

-0.01953

100

-0.19531

In the above cases, the capacitance is assumed to be in the middle of the range for specific settings. Within the capacitance

range the equation is nonlinear, thus the sensitivity is best with the lowest capacitance. This graph shows the sensitivity derivative

reading across the valid range of capacitances for a set I, T, and V_DD. For simple small electrodes (that are approximately

21 pF) and a nominal 1.8V supply the following graph is representative of this effect.

Sensitivity vs. Capacitance for V

= 1.8 V and I =36 µA and T = .5 µS

DD

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

C/ADC

Maximum

Minimum

0.01

0

10

12

14

16

18

20

22

24

26

28

30

Capacitance

Figure 24.

MPR03X

Preliminary

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Freescale Semiconductor

18

7.4

Configuration

From the implementation above, there are two elements that can be configured to yield a wide range of capacitance readings

ranging from 0.455 pF to 2874.39 pF. The two configurable components are the electrode charge current and the electrode

charge time.

The electrode charge current can be configured to equal a range of values between 1 µA and 63 µA. This value is set in the CDC

in the AFE Configuration register (Section 7.4.1).

The electrode charge time can be configured to equal a range of values between 500 ns and 32 µS. This value is set in the CDT

in the Filter Configuration Register (Section 8.3.1).

7.4.1 AFE Configuration Register

The AFE (Analog Front End) Configuration Register is used to set both the Charge/Discharge Current and the number of samples

taken in the lowest level filter. The address of the AFE Configuration Register is 0x41.

7

6

5

4

3

2

1

0

R

W

FFI

CDC

Reset:

0

= Unimplemented

Figure 25. AFE Configuration Register

Table 12. AFE Configuration Register Field Descriptions

Field

Description

7:6

FFI

First Filter Iterations – The first filter iterations field selects the number of samples

taken as input to the first level of filtering.

00 Encoding 0 – Sets samples taken to 6

01 Encoding 1 – Sets samples taken to 10

10 Encoding 2 – Sets samples taken to 18

11 Encoding 3 – Sets samples taken to 34

5:0

CDC

Charge Discharge Current – The Charge Discharge Current field selects the

supply current to be used when charging and discharging an electrode.

000000 Encoding 0 – Disables Electrode Charging

000001 Encoding 1 – Sets the current to 1uA

~

111111 Encoding 63 – Sets the current to 63uA

MPR03X

Preliminary

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Freescale Semiconductor

19

8

Filtering

8.1

Introduction

The MPR03X has three levels of filtering. The first and second level filters will allow the application to condition the signal for

undesired input variation. The third level filter can be configured to reject touch stimulus and be used as a baseline for touch

detection. Each level of filtering will be further described in this section.

8.2

First Level

The first level filter is designed to filter high frequency noise by averaging samples taken over short periods of time. The number

of samples can be configured to equal a set of values ranging from 6 to 34 samples. This value is set by the FFI in the AFE

Configuration Register (Section 7.4.1). The timing of this filter is determined by the configuration of the electrode charge time in

the Filter Configuration Register (Section 8.3.1).

Note that the electrode charge time must be configured for the capacitance in the application. The resulting value will affect the

period of the first level filter.

8.3

Second Level

The second level filter is designed to filter low frequency noise and reject false touches due to inconsistent data. The number of

samples can be configured to equal a set of values ranging from 4 to 18. This value is set by the SFI in the Filter Configuration

Register (Section 8.3.1). The timing of this filter is determined by the configuration of ESI in the Filter Configuration Register

(Section 8.3.1).

Note that the ESI (Electrode Sample Interval) must be configured to accommodate the low power requirements of a system.

Thus, the resulting value will affect the period of the second level filter.

The raw data from the second level of filtering is output in the Filtered Data High and Filtered Data Low registers, as shown in

Section 5.3.

8.3.1 Filter Configuration Register

The Filter Configuration register is used to set. The address of the Electrode Configuration Register is 0x43.

7

0

6

CDT

0

5

4

0

3

0

2

0

1

ESI

0

R

W

SFI

Reset:

0

= Unimplemented

Figure 26. Filter Configuration Register

MPR03X

Preliminary

Sensors

Freescale Semiconductor

20

Table 13. Filter Configuration Register Field Descriptions

Field

Description

7:5

CDT

Charge Discharge Time – The Charge Discharge Time field selects the amount

of time an electrode charges and discharges.

000 Encoding 0 – Invalid

001 Encoding 1 – Time is set to 0.5 µs

010 Encoding 2 – Time is set to 1 µs

~

111 Encoding 7 – Time is set to 32 µs.

4:3

SFI

Second Filter Iterations – The Second Filter Iterations field selects the number of

samples taken for the second level filter.

00 Encoding 0 – Number of samples is set to 4

01 Encoding 1 – Number of samples is set to 6

10 Encoding 2 – Number of samples is set to 10

11 Encoding 3 – Number of samples is set to 18

Electrode Sample Interval – The Electrode Sample Interval field selects the

period between samples used for the second level of filtering.

000 Encoding 0 – Period set to 1 ms

2:0

ESI

001 Encoding 1 – Period set to 2 ms

~

111 Encoding 7 – Period set to 128 ms

8.4

Third Level Filter

The Third Level Filter is designed for varying implementations. It can be used as either an additional low pass filter for the

electrode data or a baseline for touch detection. For it to function as a baseline filter, it must be used in conjunction with the touch

detection system described in the next chapter. To use the filter as an additional layer for low pass filtering, the touch detection

system must be disabled by setting all of the touch thresholds to zero (refer to Section 9.2). Although, in most cases the third

level of filter will be used as a baseline filter. The primary difference between these implementations is this: if a touch is detected

the baseline filter will hold its current value until the touch is released. The touch/release configuration will be described in

Chapter 9.

When a touch is not currently detected, the baseline filter will operate based on a few conditions. These are configured through

a set of registers including the Max Half Delta Register, the Noise Half Delta Register, and the Noise Count Limit.

8.4.1 Max Half Delta Register

The Max Half Delta register is used to set the Max Half Delta for the Third Level Filter. The address of the Max Half Delta Register

is 0x26.

7

0

6

0

5

4

3

2

0

1

0

R

W

MHD

Reset:

0

= Unimplemented

Figure 27. Max Half Delta Register

Table 14. Max Half Delta Register Field Descriptions

Field

Description

5:0

MHD

Max Half Delta – The Max Half Delta determines the largest magnitude of

variation to pass through the third level filter.

000000 DO NOT USE THIS CODE

000001 Encoding 1 – Sets the Max Half Delta to 1

~

111111 Encoding 63 – Sets the Max Half Delta to 63

MPR03X

Preliminary

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Freescale Semiconductor

21

8.4.2 Noise Half Delta Register

The Noise Half Delta register is used to set the Noise Half Delta for the third level filter. The address of the Noise Half Delta

Register is 0x27.

7

0

6

0

5

4

3

2

0

1

0

R

W

NHD

Reset:

0

= Unimplemented

Figure 28. Noise Half Delta Register

Table 15. Noise Half Delta Register Field Descriptions

Field

Description

5:0

NHD

Noise Half Delta – The Noise Half Delta determines the incremental change when

non-noise drift is detected.

000000 DO NOT USE THIS CODE

000001 Encoding 1 – Sets the Noise Half Delta to 1

~

111111 Encoding 63 – Sets the Noise Half Delta to 63

8.4.3 Noise Count Limit Register

The Noise Count Limit register is used to set the Noise Count Limit for the Third Level Filter. The address of the Noise Half Delta

Register is 0x28.

7

0

6

0

5

0

4

0

3

2

0

1

0

R

W

NCL

Reset:

0

= Unimplemented

Figure 29. Noise Count Limit Register

Table 16. Noise Count Limit Register Field Descriptions

Field

Description

3:0

NCL

Noise Count Limit – The Noise Count Limit determines the number of samples consecutively

greater than the Max Half Delta necessary before it can be determined that it is non-noise.

0000 Encoding 0 – Sets the Noise Count Limit to 1 (every time over Max Half Delta)

0001 Encoding 1 – Sets the Noise Count Limit to 2 consecutive samples over Max Half Delta

~

1111 Encoding 15 – Sets the Noise Count Limit to 15 consecutive samples over Max Half Delta

MPR03X

Preliminary

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22

Freescale Semiconductor

9

Touch Detection

9.1

Introduction

The MPR03X uses a threshold based system to determine when touches occur. This section will describe that mechanism.

9.2

Thresholds

When a touch pad is pressed, an increase in capacitance will be generated. The resulting effect will be a reduction in the ADC

counts. When the difference between the second level filter value and the third level filter value is significant, the system will

detect a touch. When a touch is detected, there are a couple of effects: the third level filter output becomes fixed (refer to

Section 8.4), an interrupt is generated (refer to Section 6), and the touch status register (Section 5.2) is updated.

The touch detection system is controlled using two threshold registers for each independent electrode. The Touch Threshold

register represents the delta at which the system will trigger a touch. The Release Threshold represents the difference at which

a release would be detected. In either case the system will respond by changing the previously mentioned items.

9.2.1 Touch Threshold Register

The Touch Threshold Register is used to set the touch threshold for each of the electrodes. The address of the ELE0 Touch

Threshold Register is 0x29. The address of the ELE1 Touch Threshold Register is 0x2A. The address of the ELE2 Touch

Threshold Register is 0x2B.

7

6

5

4

3

2

1

0

R

W

TTH

Reset:

0

= Unimplemented

Figure 30. Touch Threshold Register

Table 17. Touch Threshold Register Field Descriptions

Field

Description

7:0

Touch Threshold – The Touch Threshold Byte sets the trip point for detecting a

TTH

touch.

00000000 Encoding 0

~

11111111 Encoding 255

9.2.2 Release Threshold Register

The Release Threshold Register is used to set the release threshold for each of the electrodes. The address of the ELE0 Release

Threshold Register is 0x2C. The address of the ELE1 Release Threshold Register is 0x2D. The address of the ELE2 Release

Threshold Register is 0x2E.

7

6

5

4

3

2

1

0

R

W

RTH

Reset:

0

= Unimplemented

Figure 31. Release Threshold Register

Table 18. Release Threshold Register Field Descriptions

Field

Description

7:0

Release Threshold – The Release Threshold Byte sets the trip point for detecting

RTH

a touch.

00000000 Encoding 0

~

11111111 Encoding 255

MPR03X

Preliminary

Sensors

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 19 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 V_SS

)

Rating

Symbol

Value

Unit

Supply Voltage

V_DD

-0.3 to +2.9

V

Input Voltage

V_IN

V_SS- 0.3 to V_DD+ 0.3

V

SCL, SDA, IRQ

Operating Temperature Range

Storage Temperature Range

TSG

T_SG

-40 to +85

°C

-40 to +125

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

±4000

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

MPR03X

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_DD= 1.71 V to 2.75 V, T = T

to T

, unless otherwise noted. Typical current values are at

A

MIN

MAX

V_DD= 1.8 V, T = +25°C.)

A

Parameter

Symbol

Conditions

Min

Typ

Max

Units

1

2

Operating Supply Voltage

V_DD

1.71

1.8

2.75

V

I_DD

43

22

14

8

57.5

32

µA

Average Supply Current

Run1 Mode @ 1 ms sample period

Run1 Mode @ 2 ms sample period

Run1 Mode @ 4 ms sample period

Run1 Mode @ 8 ms sample period

Run1 Mode @ 16 ms sample period

Run1 Mode @ 32 ms sample period

Run1 Mode @ 64 ms sample period

19.4

13.3

10.1

8.6

6

5

4

7.8

4

7.5

Run1 Mode @ 128 ms sample

period

2

1

Measurement Supply Current

Idle Supply Current

I_DD

1.25

1.5

4

mA

µA

%

Peak of measurement duty cycle

Stop Mode

Electrode Charge Current

Accuracy

Relative to nominal values programmed

in Register 0x41

-6

+6

ELE_

1

Electrode Input Working Range

ELE_

Electrode charge current accuracy

within specification

0.7

V_DD- 0.7

V

Input Leakage Current ELE_

I_IH, I_IL

0.025

1

µA

2

Input Capacitance ELE_

15

pF

V

Input High Voltage SDA, SCL

V_IH

V_IL

0.7 x V_DD

2

Input Low Voltage SDA, SCL

0.3 x V_DD

1

V

Input Leakage Current

SDA, SCL

I_IH, I_IL

µA

2

1

Input Capacitance

SDA, SCL

7

pF

V

Output Low Voltage

SDA, IRQ

V_OLI_OL= 6mA

0.5V

2

Power On Reset

V_TLHV_DDrising

V_THLV_DDfalling

1.08

0.88

1.35

1.15

1.62

1.42

V

1. Parameters tested 100% at final test at room temperature; limits at -40°C and +85°C verified by characterization, not tested in production

2. Limits verified by characterization, not tested in production

A.5 AC Characteristics

Table 22. AC CHARACTERISTICS

(Typical Operating Circuit, V_DD= 1.71V to 2.75V, T_A= T_MINto T_MAX, unless otherwise noted. Typical values are at V_DD= 1.8V,

T_A= +25°C.)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

1

8 MHz Internal Oscillator

f_H

7.44

8

8.56

MHz

32 kHz Internal Oscillator

f_L

20.8

32

43.2

kHz

1. Parameters tested 100% at final test at room temperature; limits at -40°C and +70°C verified by characterization, not tested in production

2. Limits verified by characterization, not tested in production.

MPR03X

25

Preliminary

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Freescale Semiconductor

2

A.6 I C AC Characteristics

This section includes information about I²C AC Characteristics.

Table 23. I²C AC Characteristics

(Typical Operating Circuit, V_DD= 1.71 V to 2.75 V, T = T

to T

, unless otherwise noted. Typical current values are at

A

MIN

MAX

V_DD= 1.8 V, T = +25°C.)

A

Parameter

Serial Clock Frequency

Symbol

Conditions

Min

Typ

Max Units

1

2

f_SCL

400

kHz

µs

Bus Free Time Between a STOP and a START

Condition

t_BUF

1.3

2

Hold Time, (Repeated) START Condition

Repeated START Condition Setup Time

STOP Condition Setup Time

Data Hold Time

t_{HD, STA}

t_{SU, STA}

t_{SU, STO}

t_{HD, DAT}

t_{SU, DAT}

t_LOW

0.6

µs

ns

µs

ns

0.9

Data Setup Time

100

1.3

0.7

SCL Clock Low Period

SCL Clock High Period

t_HIGH

Rise Time of Both SDA and SCL Signals,

Receiving

t_R

20+0.1

C_b

300

250

2

Fall Time of Both SDA and SCL Signals,

Receiving

t_F

20+0.1

C_b

ns

Fall Time of SDA Transmitting

t_F.TX

20+0.1

C_b

2

Pulse Width of Spike Suppressed

Capacitive Load for Each Bus Line

t_SP

C_b

25

ns

pF

400

MPR03X

Preliminary

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26

Freescale Semiconductor

Appendix B Brief Register Descriptions

REGISTER

ADDRESS

REGISTER

Abrv

Fields

Initial Value

Touch Status Register

TS

OCF

E2S E1S E0S

E0FDHB

0x00

0x02

0x03

0x04

0x05

0x06

0x07

0x1A

0x1B

0x1C

0x26

0x27

0x28

0x29

0x2A

0x2B

0x2C

0x2D

0x2E

0x41

0x43

0x44

0x00

0x08

0x04

0x00

ELE0 Filtered Data Low Register

ELE0 Filtered Data High Register

ELE1 Filtered Data Low Register

ELE1 Filtered Data High Register

ELE2 Filtered Data Low Register

ELE2 Filtered Data High Register

ELE0 Baseline Value Register

ELE1 Baseline Value Register

ELE2 Baseline Value Register

Max Half Delta Register

E0FDL

E0FDH

E1FDL

E1FDH

E2FDL

D2FDH

E0BV

E1BV

E2BV

MHD

E0FDLB

E1FDLB

E2FDLB

E1FDHB

E2FDHB

E0BV

E1BV

E2BV

MHD

NHD

Noise Half Delta Register

NHD

Noise Count Limit Register

NCL

ELE0 Touch Threshold Register

E0TTH

E0RTH

E1TTH

E1RTH

E2TTH

E2RTH

ELE0 Release Threshold Register E0RTH

ELE1 Touch Threshold Register E1TTH

ELE1 Release Threshold Register E1RTH

ELE2 Touch Threshold Register E2TTH

ELE2 Release Threshold Register E2RTH

AFE Configuration Register

Filter Configuration Register

Electrode Configuration Register

AFEC

FC

FFI

CDT

CDC

SFI

ESI

EleEn

EC

CalL ModeSel

ock

MPR03X

Preliminary

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Freescale Semiconductor

27

Appendix C Ordering Information

C.1 Ordering Information

This section contains ordering information for MPR03X devices.

ORDERING INFORMATION

Case Number Touch Pads

I²C Address

0x4A

Device Name

MPR031EP

Temperature Range

-40°C to +85°C

Shipping

Bulk

1944 (8-Pin UDFN)

3-pads

MPR031EPR2

MPR032EP

0x4A

Tape and Reel

Bulk

0x4B

MPR032EPR2

0x4B

Tape and Reel

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.

M

PR EE

X

P

Package Designator

(Q = QFN, EJ = TSSOP, EP = µDFN)

Status

(M = Fully Qualified, P = Preproduction)

Version

Proximity Sensor Product

Number of Electrodes

(03 = 3 electrode device)

MPR03X

28

Preliminary

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PACKAGE DIMENSIONS

PAGE 1 OF 3

MPR03X

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PAGE 2 OF 3

MPR03X

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PAGE 3 OF 3

MPR03X

31

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Freescale Semiconductor

How to Reach Us:

Home Page:

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Web Support:

http://www.freescale.com/support

USA/Europe or Locations Not Listed:

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www.freescale.com/support

Information in this document is provided solely to enable system and software

implementers to use Freescale Semiconductor products. There are no express or

implied copyright licenses granted hereunder to design or fabricate any integrated

circuits or integrated circuits based on the information in this document.

Freescale Semiconductor reserves the right to make changes without further notice to

any products herein. Freescale Semiconductor makes no warranty, representation or

guarantee regarding the suitability of its products for any particular purpose, nor does

Freescale Semiconductor assume any liability arising out of the application or use of any

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MPR03X

Rev. 2.0

11/2008


型号：	MPR03XEP
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控制器
文件：	总32页 (文件大小：284K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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