8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
APPLICATION NOTE: The programmed cycle time is only maintained if the total averaging time for all samples is
less than the programmed cycle. The AVG[2:0] bits will take priority so that if more samples
are required than would normally be allowed during the cycle time, the cycle time will be
extended as necessary to accommodate the number of samples to be measured.
5.11
Calibration Activate Register
Table 5.21 Calibration Activate Register
ADDR
26h
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Calibration
Activate
CS8_
CAL
CS7_
CAL
CS6_
CAL
CS5_
CAL
CS4_
CAL
CS3_
CAL
CS2_
CAL
CS1_
CAL
R/W
00h
The Calibration Activate register forces the respective sensor inputs to be re-calibrated affecting both
the analog and digital blocks. During the re-calibration routine, the sensor inputs will not detect a press
for up to 600ms and the Sensor Input Base Count register values will be invalid. During this time, any
press on the corresponding sensor pads will invalidate the re-calibration. When finished, the CALX[9:0]
bits will be updated (see Section 5.39).
When the corresponding bit is set, the device will perform the calibration and the bit will be
automatically cleared once the re-calibration routine has finished.
Bit 7 - CS8_CAL - When set, the CS8 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 6 - CS7_CAL - When set, the CS7 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 5 - CS6_CAL - When set, the CS6 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 4 - CS5_CAL - When set, the CS5 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 3 - CS4_CAL - When set, the CS4 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 2 - CS3_CAL - When set, the CS3 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 1 - CS2_CAL - When set, the CS2 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
Bit 0 - CS1_CAL - When set, the CS1 input is re-calibrated. This bit is automatically cleared once the
sensor input has been re-calibrated successfully.
5.12
Interrupt Enable Register
Table 5.22 Interrupt Enable Register
ADDR
R/W
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Interrupt
Enable
CS8_
INT_EN
CS7_
INT_EN
CS6_
INT_EN
CS5_
INT_EN
CS4_
INT_EN
CS3_
INT_EN
CS2_
INT_EN
CS1_
INT_EN
27h
FFh
SMSC CAP1128
Revision 1.32 (01-05-12)
DATA5S3HEET
SMSC [ SMSC CORPORATION ]
