CAP1128 datasheet(32/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 32

 2015 Microchip Technology Inc.

Bit 5 - STBY - Enables Standby.

• ‘0’ (default) - Sensor input scanning is active and LEDs are functional.

• ‘1’ - Capacitive touch sensor input scanning is limited to the sensor inputs set in the Standby Channel register (see

Section 6.20). The status registers will not be cleared until read. LEDs that are linked to capacitive touch sensor

inputs will remain linked and active. Sensor inputs that are no longer sampled will flag a release and then remain

in a non-touched state. LEDs that are manually controlled will be unaffected.

• Bit 4 - DSLEEP - Enables Deep Sleep by deactivating all functions. This bit will be cleared when the WAKE pin is

driven high. ‘0’ (default) - Sensor input scanning is active and LEDs are functional.

• ‘1’ - All sensor input scanning is disabled. All LEDs are driven to their programmed non-actuated state and no

PWM operations will be done. The status registers are automatically cleared and the INT bit is cleared.

Bit 0 - INT - Indicates that there is an interrupt. When this bit is set, it asserts the ALERT# pin. If a channel detects a

touch and its associated interrupt enable bit is not set to a logic ‘1’, no action is taken.

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.

TABLE 6-4:

STATUS REGISTERS

ADDR

R/W

Default

02h

General Status

LED

RESET

MULT

MTP

TOUCH

00h

03h

Sensor Input Sta-

tus

CS8

CS7

CS6

CS5

CS4

CS3

CS2

CS1

00h

04h

LED Status

LED2_

LED1_

00h

TABLE 6-3:

GAIN BIT DECODE (CONTINUED)

GAIN[1:0]

Capacitive Touch Sensor Gain

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