CAP1298 datasheet(28/68 Pages) MICROCHIP

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CAP1298

DS00001571B-page 28

 2013-2015 Microchip Technology Inc.

APPLICATION NOTE: The C_GAIN[1:0] setting is only used if the COMBO bit is set. When the COMBO bit is set,

this control only applies to the sensors enabled in the Standby state, and the GAIN[1:0]

control applies to the sensors enabled in the Active state.

Bit 1 - COMBO - Enables Combo state (see Section 4.3.1.3, "Combo State Sensing Settings").

• ‘0’ (default) - The device is not in the Combo state.

• ‘1’ - The device is in the Combo state. The device is monitoring sensor inputs enabled in the Active state (see Sec-

tion 5.7, "Sensor Input Enable Register") as well as those enabled in the Standby state (see Section 5.21,

"Standby Channel Register"). The status registers will not be cleared until read. Sensor inputs that are no longer

sampled will flag a release and then remain in a non-touched state.

Bit 0 - INT - Indicates that there is an interrupt (see Section 4.9, "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 5.11, "Interrupt Enable Reg-

ister"), 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 cali-

bration.

• ‘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 Regis-

ter (see Section 5.10.1, "Calibration Activate and Status Register").

Bit 4 - PWR - Indicates that the designated power button has been held for the designated time (see Section 4.6, "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.

TABLE 5-5:

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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