8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Bit 1 - MTP - Indicates that the device has detected a number of sensor inputs that exceed the MTP
threshold either via the pattern recognition or via the number of sensor inputs (see Section 5.15). This
bit will cause the INT bit to be set if the MTP_ALERT bit is also set. This bit will not be cleared until
the condition that caused it to be set has been removed.
Bit 0 - TOUCH - Indicates that a touch was detected. This bit is set if any bit in the Sensor Input Status
register is set.
5.2.2
Sensor Input Status - 03h
The Sensor Input Status Register stores status bits that indicate a touch has been detected. A value
of ‘0’ in any bit indicates that no touch has been detected. A value of ‘1’ in any bit indicates that a
touch has been detected.
All bits are cleared when the INT bit is cleared and if a touch on the respective capacitive touch sensor
input is no longer present. If a touch is still detected, the bits will not be cleared (but this will not cause
the interrupt to be asserted - see Section 5.6).
Bit 7 - CS8 - Indicates that a touch was detected on Sensor Input 8.
Bit 6 - CS7 - Indicates that a touch was detected on Sensor Input 7.
Bit 5 - CS6 - Indicates that a touch was detected on Sensor Input 6.
Bit 4 - CS5 - Indicates that a touch was detected on Sensor Input 5.
Bit 3 - CS4 - Indicates that a touch was detected on Sensor Input 4.
Bit 2 - CS3 - Indicates that a touch was detected on Sensor Input 3.
Bit 1 - CS2 - Indicates that a touch was detected on Sensor Input 2. This sensor input can be linked
to LED2.
Bit 0 - CS1 - Indicates that a touch was detected on Sensor Input 1. This sensor input can be linked
to LED1.
5.2.3
LED Status - 04h
The LED Status Registers indicate when an LED has completed its configured behavior (see Section
5.31, "LED Behavior Register") after being actuated by the host (see Section 5.28, "LED Output
Control Register"). These bits are ignored when the LED is linked to a capacitive sensor input. All LED
Status bits are cleared when the INT bit is cleared.
Bit 1 - LED2_DN - Indicates that LED2 has finished its behavior after being actuated by the host.
Bit 0 - LED1_DN - Indicates that LED1 has finished its behavior after being actuated by the host.
5.3
Noise Flag Status Registers
Table 5.5 Noise Flag Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Noise Flag
Status
CS8_
NOISE
CS7_
NOISE
CS6_
NOISE
CS5_
NOISE
CS4_
NOISE NOISE
CS3_
CS2_
NOISE
CS1_
NOISE
0Ah
R
00h
The Noise Flag Status registers store status bits that are generated from the analog block if the
detected noise is above the operating region of the analog detector or the RF noise detector. These
bits indicate that the most recently received data from the sensor input is invalid and should not be
SMSC CAP1128
Revision 1.32 (01-05-12)
DATA4S3HEET
SMSC [ SMSC CORPORATION ]
