CAP1203 datasheet(22/59 Pages) MICROCHIP

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DS00001572B-page 22

 2013-2015 Microchip Technology Inc.

During power-on reset (POR), the default values are stored in the registers. A POR is initiated when power is first

applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical character-

istics.

When a bit is “set”, this means it’s at a logic ‘1’. When a bit is “cleared”, this means it’s at a logic ‘0’.

5.1

Main Control Register

The Main Control register controls the primary power state of the device (see Section 4.1, "Power States").

Bit 5 - STBY - Enables Standby.

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

• ‘1’ - The device is in the Standby state. Capacitive touch sensor input scanning is limited to the sensor inputs set in

the Standby Channel register (see Section 5.20, "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 4 - DSLEEP - Enables Deep Sleep.

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

• ‘1’ - The device is in the Deep Sleep state. All sensor input scanning is disabled. The status registers are automat-

ically cleared and the INT bit is cleared. When this bit is set, the STBY bit has no effect.

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 5.11, "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.

B2h

Sensor Input 2

Calibration

Stores the upper 8-bit calibration

value for CS2

00h

Page 44

B3h

Sensor Input 3

Calibration

Stores the upper 8-bit calibration

value for CS3

00h

Page 44

B9h

Sensor Input

Calibration LSB 1

Stores the 2 LSBs of the calibration

value for CS1 - CS3

00h

Page 44

ID Registers

FDh

Product ID

Stores a fixed value that identifies

the CAP1203-1

6Dh

Page 44

FEh

Manufacturer ID

Stores a fixed value that identifies

MCHP

5Dh

Page 45

FFh

Revision

Stores a fixed value that represents

the revision number

00h

Page 45

TABLE 5-2:

MAIN CONTROL REGISTER

Addr

R/W

Default

00h

R/W

Main Control

STBY

DSLEEP

INT

00h

TABLE 5-1:

Address

R/W

Function

Default

Value

Page

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