CAP1208 datasheet(31/67 Pages) MICROCHIP

31 / 67 page

8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 31

Bit 0 - INT - Indicates that there is an interrupt (see Section 4.8, "Interrupts"). When this bit is set, it

asserts the ALERT# pin. If a channel detects a touch but interrupts are not enabled for that channel

(see Section 5.12, "Interrupt Enable Register"), 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.



‘0’ - No interrupt pending.



‘1’ - An interrupt condition occurred, and the ALERT# pin has been asserted.

5.2

Status Registers

All status bits are cleared when the device enters Deep Sleep (DSLEEP = ‘1’ - see Section 5.1, "Main

Control Register").

5.2.1

General Status - 02h

Bit 6 - BC_OUT - Indicates that the base count is out of limit for one or more enabled sensor inputs

(see Section 4.4, "Sensor Input Calibration"). This bit will not be cleared until all enabled sensor inputs

have base counts within the limit.



‘0’ - All enabled sensor inputs have base counts in the operating range.



‘1’ - One or more enabled sensor inputs has the base count out of limit. A status bit is set in the

Base Count Out of Limit Register (see Section 5.17, "Base Count Out of Limit Register").

Bit 5 - ACAL_FAIL - Indicates analog calibration failure for one or more enabled sensor inputs (see

Section 4.4, "Sensor Input Calibration"). This bit will not be cleared until all enabled sensor inputs have

successfully completed analog calibration.



‘0’ - All enabled sensor inputs were successfully calibrated.



‘1’ - One or more enabled sensor inputs failed analog calibration. A status bit is set in the

Calibration Active Register (see Section 5.11, "Calibration Activate and Status Register").

Bit 4 - PWR - Indicates that the designated power button has been held for the designated time (see

Section 4.5, "Power Button"). This bit will cause the INT bit to be set. This bit is cleared when the INT

bit is cleared if there is no longer a touch on the power button.



‘0’ - The power button has not been held for the required time or is not enabled.



‘1’ - The power button has been held for the required time.

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

a POR state. 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 5.14, "Multiple Touch Configuration Register"). 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 5.15,

"Multiple Touch Pattern Configuration Register"). This bit will cause the INT bit to be set if the

Table 5.3 Status Registers

ADDR

R/W

DEFAULT

02h

General Status

BC_

OUT

ACAL

_FAIL

PWR

RESET

MULT

MTP

TOUCH

00h

03h

Sensor Input

Status

CS8

CS7

CS6

CS5

CS4

CS3

CS2

CS1

00h

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