Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Revision 1.32 (01-05-12) 66 SMSC CAP1188
DATASHEET
Bit 7 - LED8_OT - Determines the output type of the LED8 pin.
‘0’ (default) - The LED8 pin is an open-drain output with an external pull-up resistor. When the
appropriate pin is set to the “active” state (logic ‘1’), the pin will be driven low. Conversely, when
the pin is set to the “inactive” state (logic ‘0’), then the pin will be left in a High Z state and pulled
high via an external pull-up resistor.
‘1’ - The LED8 pin is a push-pull output. When driving a logic ‘1’, the pin is driven high. When
driving a logic ‘0’, the pin is driven low.
Bit 6 - LED7_OT - Determines the output type of the LED7 pin.
Bit 5 - LED6_OT - Determines the output type of the LED6 pin.
Bit 4 - LED5_OT - Determines the output type of the LED5 pin.
Bit 3 - LED4_OT - Determines the output type of the LED4 pin.
Bit 2 - LED3_OT - Determines the output type of the LED3 pin.
Bit 1 - LED2_OT - Determines the output type of the LED2 pin.
Bit 0 - LED1_OT - Determines the output type of the LED1 pin.
5.26 Sensor Input LED Linking Register
The Sensor Input LED Linking register controls whether a capacitive touch sensor input is linked to an
LED output. If the corresponding bit is set, then the appropriate LED output will change states defined
by the LED Behavior controls (see Section 5.31) in response to the capacitive touch sensor input.
Bit 7 - CS8_LED8 - Links the LED8 output to a detected touch on the CS8 sensor input. When a touch
is detected, the LED is actuated and will behave as determined by the LED Behavior controls.
‘0’ (default) - The LED8 output is not associated with the CS8 input. If a touch is detected on the
CS8 input, then the LED will not automatically be actuated. The LED is enabled and controlled via
the LED Output Control register (see Section 5.28) and the LED Behavior registers (see
Section 5.31).
‘1’ - The LED8 output is associated with the CS8 input. If a touch is detected on the CS8 input,
the LED will be actuated and behave as defined in Table 5.52.
Bit 6 - CS7_LED7 - Links the LED7 output to a detected touch on the CS7 sensor input. When a touch
is detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 5 - CS6_LED6 - Links the LED6 output to a detected touch on the CS6 sensor input. When a touch
is detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 4 - CS5_LED5 - Links the LED5 output to a detected touch on the CS5 sensor input. When a touch
is detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 3 - CS4_LED4 - Links the LED4 output to a detected touch on the CS4 sensor input. When a touch
is detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Table 5.45 Sensor Input LED Linking Register
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
72h R/W
Sensor
Input LED
Linking
CS8_
LED8
CS7_
LED7
CS6_
LED6
CS5_
LED5
CS4_
LED4
CS3_
LED3
CS2_
LED2
CS1_
LED1
00h