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MPR032 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MPR032 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 32 page MPR03X Sensors Freescale Semiconductor 9 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. 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 0x00 ELE0 Filtered Data Low Register Cleared 0x02 0x00 ELE0 Filtered Data High Register Cleared 0x03 0x00 ELE1 Filtered Data Low Register Cleared 0x04 0x00 ELE1 Filtered Data High Register Cleared 0x05 0x00 ELE2 Filtered Data Low Register Cleared 0x06 0x00 ELE2 Filtered Data High Register Cleared 0x07 0x00 ELE0 Baseline Value Register Cleared 0x1A 0x00 ELE1 Baseline Value Register Cleared 0x1B 0x00 ELE2 Baseline Value Register Cleared 0x1C 0x00 Max Half Delta Register Max Half Delta set to 1 0x26 0x00 Noise Half Delta Register Noise Half Delta Amount set to 1 0x27 0x00 Noise Count Limit Register Noise Count Limit set to 1 0x28 0x00 ELE0 Touch Threshold Register Threshold set to 1 0x29 0x00 ELE0 Release Threshold Register Threshold set to 1 0x2A 0x00 ELE1 Touch Threshold Register Threshold set to 1 0x2B 0x00 ELE1 Release Threshold Register Threshold set to 1 0x2C 0x00 ELE2 Touch Threshold Register Threshold set to 1 0x2D 0x00 ELE2 Release Threshold Register Threshold set to 1 0x2E 0x00 AFE Configuration Register 6 AFE samples, 16µA charge current 0x41 0x08 Filter Configuration Register 6 touch detection samples, 16ms detection sample interval 0x43 0x04 Electrode Configuration Register Stop mode. ELE2/IRQ pin is interrupt function, 0x44 0x00 |
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