6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
The Sensor Status Registers store 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 status bits are cleared when the device enters the Deep Sleep (DSLEEP = ‘1’ - see Section 5.1).
All status bits are cleared when the INT bit is cleared and if a touch on the respective Capacitive Touch
Sensor is no longer present. If a touch is still detected, then the bits will not be cleared (but this will
not cause the interrupt to be asserted - see Section 5.6).
5.2.1
Sensor Status
Bit 5 - CS6 - Indicates that a touch was detected on Sensor 6.
Bit 4 - CS5 - Indicates that a touch was detected on Sensor 5.
Bit 3 - CS4 - Indicates that a touch was detected on Sensor 4.
Bit 2 - CS3 - Indicates that a touch was detected on Sensor 3.
Bit 1 - CS2 - Indicates that a touch was detected on Sensor 2. This sensor can be linked to LED2.
Bit 0 - CS1 - Indicates that a touch was detected on Sensor 1. This sensor can be linked to LED1.
5.2.2
LED Status
Bit 1 - LED2_DN - Indicates that LED2 has finished its ramping behavior as determined by the
LED2_CTL bits.
Bit 0 - LED1_DN - Indicates that LED1 has finished its ramping behavior as determined by the
LED1_CTL bits.
5.3
Noise Flag Status Registers
Table 5.4 Noise Flag Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
-
-
CS6_
NOISE
CS5_
NOISE
CS4_
NOISE
CS3_
NOISE
CS2_
NOISE
CS1_
NOISE
0Ah
R
Noise Flag Status
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. These bits indicate that the most
recently received data from the sensor is invalid and should not be used for touch detection.
Furthermore, so long as the bit is set for a particular channel, no decisions are made with the data. A
touch is not detected, and a release is not detected.
These bits are not sticky and will be cleared automatically if the analog block does not report a noise
error.
5.4
Sensor Delta Count Registers
Table 5.5 Sensor Delta Count Registers
ADDR
10h
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Sensor 1 Delta
Count
R
Sign
64
32
16
8
4
2
1
00h
Revision 1.1 (08-05-09)
SMSC CAP1026
DATA3S6HEET
SMSC [ SMSC CORPORATION ]
