8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
‘0’ (default) - The Noise Status registers will show both RF noise and low frequency EMI noise if
either is detected on a capacitive touch sensor input.
‘1’ - The Noise Status registers will only show RF noise if it is detected on a capacitive touch sensor
input. EMI noise will still be detected and touches will be blocked normally; however, the status bits
will not be updated.
Bit 2 - DIS_RF_NOISE - Determines whether the RF noise filter is enabled. Setting this bit disables
the feature.
‘0’ (default) - If RF noise is detected by the analog block, the delta count on the corresponding
channel is set to 0. Note that this does not require that Noise Status bits be set.
‘1’ - A touch is not blocked even if RF noise is detected.
Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button.
‘0’ (default) - An interrupt is generated when a press is detected and again when a release is
detected and at the repeat rate (if enabled - see Section 5.13).
‘1’ - An interrupt is generated when a press is detected and at the repeat rate but not when a
release is detected.
5.7
Sensor Input Enable Registers
Table 5.11 Sensor Input Enable Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Sensor Input
Enable
21h
R/W
CS8_EN
CS7_EN
CS6_EN
CS5_EN
CS4_EN
CS3_EN
CS2_EN
CS1_EN
FFh
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.
Revision 1.32 (01-05-12)
SMSC CAP1128
DATA4S8HEET
SMSC [ SMSC CORPORATION ]
