5 and 6 Channel Capacitive Touch Sensor
Datasheet
5.6
Configuration Register
Table 5.9 Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
-
BLK_ DIG_
NOISE
BLK_ ANA_
NOISE
MAX_DUR_
EN
20h
R/W
Configuration
TIMEOUT
-
-
-
20h
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 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).
5.7
Sensor Enable Registers
Table 5.10 Sensor Enable Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
21h
R/W
Sensor Enable
-
-
CS6_EN
CS5_EN
CS4_EN
CS3_EN
CS2_EN
CS1_EN
3Fh
The Sensor Enable registers determine whether a Capacitive Touch Sensor input is included in the
sampling cycle. The length of the sampling cycle is not affected by the number of sensors measured.
Bit 5 - CS6_EN - Enables the CS6 input to be included during the sampling cycle.
‘0’ - The CS6 input is not included in the sampling cycle.
SMSC CAP1005 / CAP1006
Revision 1.1 (08-05-09)
DATA3S3HEET
SMSC [ SMSC CORPORATION ]
