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參數(shù)資料
| 型號： | CAP1028-1-BP-TR |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLAINT, QFN-20 |
| 文件頁數(shù)： | 37/69頁 |
| 文件大?。?/td> | 948K |
| 代理商： | CAP1028-1-BP-TR |
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8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Revision 1.0 (06-16-09)
42
SMSC CAP1028
DATASHEET
before the next channel is sampled and the result is averaged over the number of samples measured
before updating the measured results.
For example, if CS1, CS2, and CS3 are sampled during the sensor cycle, and the AVG[2:0] bits are
set to take 4 samples per channel, then the full sensor cycle will be: CS1, CS1, CS1, CS1, CS2, CS2,
CS2, CS2, CS3, CS3, CS3, CS3.
Bit 2 - SAMP_TIME - Determines the sampling time.
‘0’ - The sampling time is ~2.56ms for each sensor.
‘1’ (default) - The sampling time is ~1.28ms for each sensor.
Bits 1 - 0 - CYCLE_TIME[1:0] - 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.
APPLICATION NOTE: The programmed cycle time is only maintained if the total averaging time for all samples is
less than the programmed cycle. The 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.
Table 5.16 AVG Bit Decode
AVG[2:0]
NUMBER OF SAMPLES TAKEN
PER MEASUREMENT
21
0
00
0
1
00
1
2
01
0
4
0
1
8 (default)
10
0
16
10
1
32
11
0
64
1
128
Table 5.17 CYCLE_TIME Bit Decode
CYCLE_TIME[1:0]
OVERALL CYCLE TIME
10
00
35ms
0
1
70ms (default)
1
0
105ms
1
140ms
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