Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
SMSC CAP1188 49 Revision 1.32 (01-05-12)
DATASHEET
5.7 Sensor Input Enable Registers
The Sensor Input Enable registers determine whether a capacitive touch sensor input is included in
the sampling cycle. The length of the sampling cycle is not affected by the number of sensor inputs
measured.
Bit 7 - CS8_EN - Enables the CS8 input to be included during the sampling cycle.
‘0’ - The CS8 input is not included in the sampling cycle.
‘1’ (default) - The CS8 input is included in the sampling cycle.
Bit 6 - CS7_EN - Enables the CS7 input to be included during the sampling cycle.
Bit 5 - CS6_EN - Enables the CS6 input to be included during the sampling cycle.
Bit 4 - CS5_EN - Enables the CS5 input to be included during the sampling cycle.
Bit 3 - CS4_EN - Enables the CS4 input to be included during the sampling cycle.
Bit 2 - CS3_EN - Enables the CS3 input to be included during the sampling cycle.
Bit 1 - CS2_EN - Enables the CS2 input to be included during the sampling cycle.
Bit 0 - CS1_EN - Enables the CS1 input to be included during the sampling cycle.
5.8 Sensor Input Configuration Register
The Sensor Input Configuration Register controls timings associated with the Capacitive sensor inputs
1 - 8.
Bits 7 - 4 - MAX_DUR[3:0] - (default 1010b) - Determines the maximum time that a sensor pad is
allowed to be touched until the capacitive touch sensor input is recalibrated, as shown in Table 5.13.
Table 5.11 Sensor Input Enable Registers
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
21h R/W
Sensor Input
Enable
CS8_EN CS7_EN CS6_EN CS5_EN CS4_EN CS3_EN CS2_EN CS1_EN FFh
Table 5.12 Sensor Input Configuration Register
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
22h R/W
Sensor Input
Configuration
MAX_DUR[3:0] RPT_RATE[3:0] A4h
Table 5.13 MAX_DUR Bit Decode
MAX_DUR[3:0]
TIME BEFORE RECALIBRATION3 2 1 0
0 0 0 0 560ms
0 0 0 1 840ms