CAP1214 datasheet(74/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

Bits 2 - 0 - PROX_D_SENSE[2:0] - Controls the sensitivity of detecting proximity. The sensitivity

settings act to scale the relative delta count value higher or lower based on the system parameters. A

setting of 0000b is the most sensitive while a setting of 1111b is the least sensitive. At the more

sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These

settings are more sensitive to noise, however, and a noisy environment may flag more false touches

than less sensitive levels. See Table 6.17.

6.36

Sampling Channel Select Register

The Sampling Channel Select Register determines which (if any) Capacitive Sensor input is controlled

by the Sampling Configuration register.

Bit 7 - GR_S - Determines if all grouped sensors are controlled by the Sampling Configuration register

settings.

‘0’ (default) - The grouped sensors are not controlled by the Sampling Configuration register

settings. All Grouped sensors will be sampled in a 2.5ms window of the entire polling cycle (which

requires 35ms).

‘1’ - The grouped sensors are controlled by the Sampling Configuration register settings. Each

sensor sampling window will be determined based on these bit settings and the overall polling cycle

time will increase.

Bit 6 - CS7_S - Determines if Capacitive Touch Sensor 7 is controlled by the Sampling Configuration

Bit 5 - CS6_S - Determines if Capacitive Touch Sensor 6 is controlled by the Sampling Configuration

Bit 4 - CS5_S - Determines if Capacitive Touch Sensor 5 is controlled by the Sampling Configuration

Bit 3 - CS4_S - Determines if Capacitive Touch Sensor 4 is controlled by the Sampling Configuration

Bit 2 - CS3_S - Determines if Capacitive Touch Sensor 3 is controlled by the Sampling Configuration

Bit 1 - CS2_S - Determines if Capacitive Touch Sensor 2 is controlled by the Sampling Configuration

Bit 0 - CS1_S - Determines if Capacitive Touch Sensor 1 is controlled by the Sampling Configuration

Table 6.54 Sampling Channel Select Register

ADDR

R/W

DEFAULT

4Eh

R/W

Sampling

Channel Select

GR_S

CS7_S

CS6_S

CS5_S

CS4_S

CS3_S

CS2_S

CS1_S

00h

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