6 Channel Capacitive Touch Sensor with 6 LED Drivers
Datasheet
During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when
power is first applied to the part and the voltage on the VDD supply surpasses the POR level as
specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to
undefined registers will not have an effect.
5.1
Main Status Control Register
Table 5.2 Main Status Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Main Status
Control
00h
R/W
-
-
STBY
DSLEEP
-
-
-
INT
00h
The Main Status and Control register controls the primary power state of the device.
Bit 5 - STBY - Enables Standby.
‘0’ (default) - Sensor scanning is active and LEDs are functional.
‘1’ - Capacitive Touch Sensor scanning is limited to the sensors set in the Standby Channel register
(see Section 5.18). The status registers will not be cleared until read. LEDs that are linked to
Capacitive Touch sensors will remain linked and active. Sensors that are no longer sampled will
flag a release and then remain in a non-touched state. LEDs that are manually controlled will be
unaffected.
Bit 4 - DSLEEP - Enables Deep Sleep by deactivating all functions. This bit will be cleared when the
WAKE pin is driven high or when SPI or SMBus are received targeting the CAP1066. If the CAP1066
is configured to communicate using the BC-Link protocol, then this bit is ignored.
‘0’ (default) - Sensor scanning is active and LEDs are functional.
‘1’ - All sensor scanning is disabled and all LEDs are disabled. The status registers are
automatically cleared and the INT bit is cleared.
Bit 0 - INT - Indicates that there is an interrupt. This bit is only set if the ALERT# pin has been asserted.
If a channel detects a touch and its associated interrupt enable bit is not set to a logic ‘1’ then no
action is taken.
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
R
R
Sensor Status
-
-
-
CS6
CS5
CS4
CS3
CS2
CS1
00h
LED6_
DN
LED5_
DN
LED4_
DN
LED3_
DN
LED2_
DN
LED1_
DN
04h
LED Status
-
00h
SMSC CAP1066
Revision 1.1 (08-05-09)
DATA3S5HEET
SMSC [ SMSC CORPORATION ]
