CAP1026 Datasheet, PDF (39/70 Pages) SMSC Corporation – 6 Channel Capacitive Touch Sensor with 2 LED Drivers

6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
5.6 Configuration Register
Table 5.9 Configuration Register
ADDR R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0 DEFAULT
20h
R/W
Configuration
TIMEOUT
WAKE_
CFG
BLK_ DIG_
NOISE
BLK_ ANA_
NOISE
MAX_DUR_
EN
-
-
-
20h
5.7
The Configuration register controls general global functionality that affects the entire device.
Bit 7 - TIMEOUT - Enables the timeout and idle functionality of the SMBus protocol.
„ ‘0’ (default) - The SMBus timeout and idle functionality are disabled. The SMBus interface will not
time out if the clock line is held low. Likewise, it will not reset if both the data and clock lines are
held high for longer than 150us. This is used for I²C compliance.
„ ‘1’ - The SMBus timeout and idle functionality are enabled. The SMBus interface will time out if the
clock line is held low for longer than 30ms. Likewise, it will reset if both the data and clock lines
are held high for longer than 150us.
Bit 6 - WAKE_CFG - Configures the operation of the WAKE pin.
„ ‘0’ (default) - The WAKE pin is not asserted when a touch is detected while the device is in Standby.
It will still be used to wake the device from Deep Sleep when driven high.
„ ‘1’ - The WAKE pin will be asserted high when a touch is detected while the device is in Standby.
It will also be used to wake the device from Deep Sleep when driven high.
Bit 5 - BLK_DIG_NOISE - Determines whether the digital noise threshold is used by the device.
„ ‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does
not exceed the touch threshold, then the sample is discarded and not used for the automatic re-
calibration routine.
„ ‘1’ (default) - The noise threshold is not used. Any delta count that is less than the touch threshold
is used for the automatic re-calibration routine.
Bit 4 - BLK_ANA_NOISE - Determines whether the analog noise flag setting will block a touch
detection as well as the analog calibration routine.
„ ‘0’ (default) - If the analog noise bit is set, then a touch is blocked on the corresponding channel
and will force the analog calibration routine to retry.
„ ‘1’ - A touch is not blocked even if the analog noise bit is set. Likewise, the analog calibration
routine will not retry if the analog noise bit is set.
Bit 3 - MAX_DUR_EN - Determines whether the maximum duration recalibration is enabled for non-
grouped sensors.
„ ‘0’ (default) - The maximum duration recalibration functionality is disabled. A touch may be held
indefinitely and no re-calibration will be performed on any sensor.
„ ‘1’ - The maximum duration recalibration functionality is enabled. If a touch is held for longer than
the MAX_DUR bit settings, then the re-calibration routine will be restarted (see Section 5.8).
Sensor Enable Registers
Table 5.10 Sensor Enable Registers
ADDR R/W
REGISTER
B7
21h
R/W
Sensor Enable
-
B6
B5
B4
B3
B2
B1
B0
DEFAULT
-
CS6_EN CS5_EN CS4_EN CS3_EN CS2_EN CS1_EN
3Fh
SMSC CAP1026
39
DATASHEET
Revision 1.1 (08-05-09)