3 Channel Capacitive Touch Sensor with 3 LED Drivers
Datasheet
‘0’ - (default) - The active sensor input delta count values will be based on the average of the
programmed number of samples when compared against the threshold.
‘1’ - The active sensor input delta count values will be based on the summation of the programmed
number of samples when compared against the threshold. This bit should only be set when
performing proximity detection as a physical touch will overflow the delta count registers and may
result in false readings.
Bits 6 - 4 - STBY_AVG[2:0] - Determines the number of samples that are taken for all active channels
during the sensor cycle as shown in Table 5.37. All samples are taken consecutively on the same
channel before the next channel is sampled and the result is averaged over the number of samples
measured before updating the measured results.
Table 5.37 STBY_AVG Bit Decode
STBY_AVG[2:0]
NUMBER OF SAMPLES TAKEN
2
1
0
PER MEASUREMENT
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
2
4
8 (default)
16
32
64
128
Bit 3-2 - STBY SAMP_TIME[1:0] - Determines the time to take a single sample when the device is in
Standby as shown in Table 5.38.
Table 5.38 STBY_SAMP_TIME Bit Decode
STBY_SAMP_TIME[1:0]
1
0
SAMPLING TIME
0
0
1
1
0
1
0
1
320us
640us
1.28ms (default)
2.56ms
Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the overall cycle time for all measured channels during
standby operation as shown in Table 5.39. All measured channels are sampled at the beginning of the
cycle time. If additional time is remaining, the device is placed into a lower power state for the
remaining duration of the cycle.
SMSC CAP1133
Revision 1.32 (01-05-12)
DATA4S5HEET
SMSC [ SMSC CORPORATION ]
