8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Table 5.31 STBY_AVG Bit Decode
STBY_AVG[2:0]
1
NUMBER OF SAMPLES TAKEN
PER MEASUREMENT
2
0
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 2 - STBY SAMP_TIME - Determines the time to take a single sample when the device is in Standby.
‘0’ - The sampling time is ~2.56ms.
‘1’ (default) - The sampling time is ~1.28ms.
Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the overall cycle time for all measured channels during
normal operation as shown in Table 5.17. All measured channels are sampled at the beginning of the
cycle time. If additional time is remaining, then the device is placed into a lower power state for the
remaining duration of the cycle.
Table 5.32 STBY_CY_TIME Bit Decode
STBY_CY_TIME[1:0]
1
0
OVERALL CYCLE TIME
0
0
1
1
0
1
0
1
35ms
70ms (default)
105ms
140ms
APPLICATION NOTE: The programmed cycle time is only maintained if the total averaging time for all samples is
less than the programmed cycle. The STBY_AVG[2:0] bits will take priority so that if more
samples are required than would normally be allowed during the cycle time, the cycle time
will be extended as necessary to accommodate the number of samples to be measured.
SMSC CAP1088
Revision 1.1 (08-05-09)
DATA5S1HEET
SMSC [ SMSC CORPORATION ]
