Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Revision 1.32 (01-05-12) 54 SMSC CAP1188
DATASHEET
5.11 Calibration Activate Register
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
The Interrupt Enable register determines whether a sensor pad touch or release (if enabled) causes
the interrupt pin to be asserted.
Bit 7 - CS8_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS8
(associated with the CS8 status bit).
Table 5.21 Calibration Activate Register
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
26h R/W
Calibration
Activate
CS8_
CAL
CS7_
CAL
CS6_
CAL
CS5_
CAL
CS4_
CAL
CS3_
CAL
CS2_
CAL
CS1_
CAL
00h
Table 5.22 Interrupt Enable Register
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
27h R/W
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
FFh