8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT# pin will be deasserted
and all status registers will be cleared if the condition has been removed. If the WAKE/SPI_MOSI pin
is asserted as a result of a touch detected while in Standby, it will likewise be deasserted when this
bit is cleared.
Note that this pin is not driven when communicating via the 4-wire SPI protocol
‘0’ - No interrupt pending.
‘1’ - A touch has been detected on one or more channels and the interrupt has been asserted.
5.2
Status Registers
Table 5.3 Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
03h
04h
R
Sensor Status
CS8
CS7
CS6
CS5
CS4
CS3
CS2
CS1
00h
LED8_
DN
LED7_
DN
LED6_
DN
LED5_
DN
LED4_
DN
LED3_
DN
LED2_
DN
LED1_
DN
R
LED Status
00h
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 7 - CS8 - Indicates that a touch was detected on Sensor 8. This sensor can be linked to LED8.
Bit 6 - CS7 - Indicates that a touch was detected on Sensor 7. This sensor can be linked to LED7.
Bit 5 - CS6 - Indicates that a touch was detected on Sensor 6. This sensor can be linked to LED6.
Bit 4 - CS5 - Indicates that a touch was detected on Sensor 5. This sensor can be linked to LED5.
Bit 3 - CS4 - Indicates that a touch was detected on Sensor 4. This sensor can be linked to LED4.
Bit 2 - CS3 - Indicates that a touch was detected on Sensor 3. This sensor can be linked to LED3.
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 7 - LED8_DN - Indicates that LED8 has finished its ramping behavior as determined by the
LED8_CTL bits.
Bit 6 - LED7_DN - Indicates that LED7 has finished its ramping behavior as determined by the
LED7_CTL bits.
Bit 5 - LED6_DN - Indicates that LED6 has finished its ramping behavior as determined by the
LED6_CTL bits.
Bit 4 - LED5_DN - Indicates that LED5 has finished its ramping behavior as determined by the
LED5_CTL bits.
Revision 1.1 (08-05-09)
SMSC CAP1088
DATA3S6HEET
SMSC [ SMSC CORPORATION ]
