CAP1126 datasheet(32/73 Pages) MICROCHIP

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CAP1126

DS00001623B-page 32

 2015 Microchip Technology Inc.

This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT# pin will be deasserted and all status

registers will be cleared if the condition has been removed. If the WAKE/SPI_MOSI pin is asserted as a result of a touch

detected while in Standby, it will likewise be deasserted when this bit is cleared.

Note that the WAKE / SPI_MOSI pin is not driven when communicating via the 4-wire SPI protocol.

• ‘0’ - No interrupt pending.

• ‘1’ - A touch has been detected on one or more channels and the interrupt has been asserted.

6.2

Status Registers

All status bits are cleared when the device enters the Deep Sleep (DSLEEP = ‘1’ - see Section 6.1).

6.2.1

GENERAL STATUS - 02H

Bit 4 - LED - Indicates that one or more LEDs have finished their programmed activity. This bit is set if any bit in the LED

Status register is set.

Bit 3 - RESET - Indicates that the device has come out of reset. This bit is set when the device exits a POR state or

when the RESET pin has been deasserted and qualified via the RESET pin filter (see Section 5.2). This bit will cause

the INT bit to be set and is cleared when the INT bit is cleared.

Bit 2 - MULT - Indicates that the device is blocking detected touches due to the Multiple Touch detection circuitry (see

Section 6.14). This bit will not cause the INT bit to be set and hence will not cause an interrupt.

Bit 1 - MTP - Indicates that the device has detected a number of sensor inputs that exceed the MTP threshold either via

the pattern recognition or via the number of sensor inputs (see Section 6.15). This bit will cause the INT bit to be set if

the MTP_ALERT bit is also set. This bit will not be cleared until the condition that caused it to be set has been removed.

Bit 0 - TOUCH - Indicates that a touch was detected. This bit is set if any bit in the Sensor Input Status register is set.

6.2.2

SENSOR INPUT STATUS - 03H

The Sensor Input Status Register stores status bits that indicate a touch has been detected. A value of ‘0’ in any bit

indicates that no touch has been detected. A value of ‘1’ in any bit indicates that a touch has been detected.

All bits are cleared when the INT bit is cleared and if a touch on the respective capacitive touch sensor input is no longer

present. If a touch is still detected, the bits will not be cleared (but this will not cause the interrupt to be asserted - see

Section 6.6).

Bit 5 - CS6 - Indicates that a touch was detected on Sensor Input 6.

Bit 4 - CS5 - Indicates that a touch was detected on Sensor Input 5.

Bit 3 - CS4 - Indicates that a touch was detected on Sensor Input 4.

Bit 2 - CS3 - Indicates that a touch was detected on Sensor Input 3.

Bit 1 - CS2 - Indicates that a touch was detected on Sensor Input 2. This sensor input can be linked to LED2.

Bit 0 - CS1 - Indicates that a touch was detected on Sensor Input 1. This sensor input can be linked to LED1.

6.2.3

LED STATUS - 04H

The LED Status Registers indicate when an LED has completed its configured behavior (see Section 6.31, "LED Behav-

ior Register") after being actuated by the host (see Section 6.28, "LED Output Control Register"). These bits are ignored

when the LED is linked to a capacitive sensor input. All LED Status bits are cleared when the INT bit is cleared.

Bit 1 - LED2_DN - Indicates that LED2 has finished its behavior after being actuated by the host.

Bit 0 - LED1_DN - Indicates that LED1 has finished its behavior after being actuated by the host.

TABLE 6-4:

STATUS REGISTERS

ADDR

R/W

Default

02h

General Status

LED

RESET

MULT

MTP

TOUCH

00h

03h

Sensor Input Sta-

tus

CS6

CS5

CS4

CS3

CS2

CS1

00h

04h

LED Status

LED2_

LED1_

00h

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