CAP1114 datasheet(73/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

Bits 2 - 0 - PROX_D_SENSE[2:0] - Controls the sensitivity of proximity detection on CS1. 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

6.37

Sampling Configuration Register

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

Table 6.55 Sampling Configuration Register

ADDR

R/W

DEFAULT

4Fh

R/W

Sampling

Configuration

-----

OVERSAMP_RATE[2:0]

00h

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