MPR031(2009) 查看數據表（PDF） - Freescale Semiconductor

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MPR031
(Rev.:2009)

Proximity Capacitive Touch Sensor Controller

Freescale Semiconductor 

4 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

Power-Up Condition

Register Address

Touch Status Register

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

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

Cleared

Cleared

Cleared

Cleared

Cleared

Cleared

Cleared

Cleared

Cleared

Cleared

Max Half Delta set to 1

Noise Half Delta Amount set to 1

Noise Count Limit set to 1

Threshold set to 1

Threshold set to 1

Threshold set to 1

Threshold set to 1

Threshold set to 1

Threshold set to 1

6 AFE samples, 16µA charge current

6 touch detection samples, 16ms

detection sample interval

Stop mode. ELE2/IRQ pin is interrupt

function,

0x00

0x02

0x03

0x04

0x05

0x06

0x07

0x1A

0x1B

0x1C

0x26

0x27

0x28

0x29

0x2A

0x2B

0x2C

0x2D

0x2E

0x41

0x43

0x44

HEX Value

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x08

0x04

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.

Sensors

Freescale Semiconductor

MPR03X

9

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