Freescale Semiconductor Evaluation Board MPR031/2 for 2- or 3-pad touch sensor controllers DEMOMPR031 DEMOMPR031 データシート

製品コード

DEMOMPR031

MPR03X

Sensors
Freescale Semiconductor

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.

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.

Table 4. Power-Up Register Configurations

Register

Power-Up Condition

Register Address

HEX Value

Touch Status Register

Cleared

0x00

ELE0

Filtered Data Low Register

Cleared

0x02