參數(shù)資料
型號(hào)： AD7147PACPZ-500R7
廠商： Analog Devices Inc
文件頁數(shù)： 16/73頁
文件大?。?/td> 0K
描述： IC CAP-TO-DGTL CONV PROG 24LFCSP
標(biāo)準(zhǔn)包裝： 1
系列： CapTouch™
類型： 電容數(shù)字轉(zhuǎn)換器
分辨率（位）： 16 b
采樣率（每秒）： 250k
數(shù)據(jù)接口： 串行，SPI?
電壓電源： 單電源
電源電壓： 2.6 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-VQ（4x4）
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面： 781 (CN2011-ZH PDF)
其它名稱： AD7147PACPZ-500R7DKR
AD7147
Data Sheet
Rev. D | Page 22 of 72
FF_SKIP_CNT
The proximity detection fast FIFO is used by the on-chip logic
to determine if proximity is detected. The fast FIFO expects to
receive samples from the converter at a set rate. FF_SKIP_CNT
is used to normalize the frequency of the samples going into the
FIFO, regardless of how many conversion stages are in a sequence.
In Register 0x002, Bits[3:0] are the fast filter skip control,
FF_SKIP_CNT. This value determines which CDC samples
are not used (skipped) by the proximity detection fast FIFO.
Determining the FF_SKIP_CNT value is required only once
during the initial setup of the capacitance sensor interface.
Table 13 shows how FF_SKIP_CNT controls the update rate of
the fast FIFO. The recommended value for the setting when
using all 12 conversion stages on the AD7147 is 0000, or no
samples skipped.
Table 13. FF_SKIP_CNT Settings
FAST FIFO Update Rate
FF_SKIP
_CNT
Decimation = 64
Decimation = 128
Decimation = 256
0
0.768 × (SEQUENCE_STAGE_NUM + 1) ms
1.536 × (SEQUENCE_STAGE_NUM + 1) ms
3.072 × (SEQUENCE_STAGE_NUM + 1) ms
1
1.536 × (SEQUENCE_STAGE_NUM + 1) ms
3.072 × (SEQUENCE_STAGE_NUM + 1) ms
6.144 × (SEQUENCE_STAGE_NUM + 1) ms
2
2.3 × (SEQUENCE_STAGE_NUM + 1) ms
4.608 × (SEQUENCE_STAGE_NUM + 1) ms
9.216 × (SEQUENCE_STAGE_NUM + 1) ms
3
3.072 × (SEQUENCE_STAGE_NUM + 1) ms
6.144 × (SEQUENCE_STAGE_NUM + 1) ms
12.288 × (SEQUENCE_STAGE_NUM + 1) ms
4
3.84 × (SEQUENCE_STAGE_NUM + 1) ms
7.68 × (SEQUENCE_STAGE_NUM + 1) ms
15.36 × (SEQUENCE_STAGE_NUM + 1) ms
5
4.6 × (SEQUENCE_STAGE_NUM + 1) ms
9.216 × (SEQUENCE_STAGE_NUM + 1) ms
18.432 × (SEQUENCE_STAGE_NUM + 1) ms
6
5.376 × (SEQUENCE_STAGE_NUM + 1) ms
10.752 × (SEQUENCE_STAGE_NUM + 1) ms
21.504 × (SEQUENCE_STAGE_NUM + 1) ms
7
6.144 × (SEQUENCE_STAGE_NUM + 1) ms
12.288 × (SEQUENCE_STAGE_NUM + 1) ms
24.576 × (SEQUENCE_STAGE_NUM + 1) ms
8
6.912 × (SEQUENCE_STAGE_NUM + 1) ms
13.824 × (SEQUENCE_STAGE_NUM + 1) ms
27.648 × (SEQUENCE_STAGE_NUM + 1) ms
9
7.68 × (SEQUENCE_STAGE_NUM + 1) ms
15.36 × (SEQUENCE_STAGE_NUM + 1) ms
30.72 × (SEQUENCE_STAGE_NUM + 1) ms
10
8.448 × (SEQUENCE_STAGE_NUM + 1) ms
16.896 × (SEQUENCE_STAGE_NUM + 1) ms
33.792 × (SEQUENCE_STAGE_NUM + 1) ms
11
9.216 × (SEQUENCE_STAGE_NUM + 1) ms
18.432 × (SEQUENCE_STAGE_NUM + 1) ms
36.864 × (SEQUENCE_STAGE_NUM + 1) ms
12
9.984 × (SEQUENCE_STAGE_NUM + 1) ms
19.968 × (SEQUENCE_STAGE_NUM + 1) ms
39.936 × (SEQUENCE_STAGE_NUM + 1) ms
13
10.752 × (SEQUENCE_STAGE_NUM + 1) ms
21.504 × (SEQUENCE_STAGE_NUM + 1) ms
43.008 × (SEQUENCE_STAGE_NUM + 1) ms
14
11.52 × (SEQUENCE_STAGE_NUM + 1) ms
23.04 × (SEQUENCE_STAGE_NUM + 1) ms
46.08 × (SEQUENCE_STAGE_NUM + 1) ms
15
12.288 × (SEQUENCE_STAGE_NUM + 1) ms
24.576 × (SEQUENCE_STAGE_NUM + 1) ms
49.152 × (SEQUENCE_STAGE_NUM + 1) ms
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