CAP1293 datasheet(25/63 Pages) MICROCHIP

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DS00001566B-page 25

CAP1293

Bits 7 - 6 - GAIN[1:0] - Controls the analog gain used by the capacitive touch sensing circuitry. As the gain is increased,

the effective sensitivity is likewise increased as a smaller delta capacitance is required to generate the same delta count

values. The sensitivity settings may need to be adjusted along with the gain settings such that data overflow does not

occur.

APPLICATION NOTE: The GAIN[1:0] settings apply to both Standby and Active states, unless the COMBO bit is

set. When the COMBO bit is set, this control only applies to the sensors enabled in the

Active state, and the C_GAIN[1:0] control applies to the sensors enabled in the Standby

state.

APPLICATION NOTE: Whenever the gain settings change, the device will recalibrate all sensor inputs as if they

had no base count.

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 5.21, "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 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..

Bits 3 - 2 - C_GAIN[1:0] - When the COMBO bit is set, this bit controls the analog gain used for capacitive touch sensor

inputs enabled in the Standby state. As the gain is increased, the effective sensitivity is likewise increased as a smaller

delta capacitance is required to generate the same delta count values. The Standby sensitivity settings may need to be

adjusted along with the gain settings such that data overflow does not occur.

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.

TABLE 5-4:

GAIN AND C_GAIN BIT DECODE

GAIN[1:0] or C_GAIN[1:0]

Capacitive Touch Sensor Input Gain

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