參數(shù)資料
型號(hào)： AD7147WPACPZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 10/73頁(yè)
文件大小： 0K
描述： IC CAP-TO-DGTL CONV PROG 24LFCSP
標(biāo)準(zhǔn)包裝： 5,000
系列： CapTouch™
類(lèi)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(lèi)型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-VQ（4x4）
包裝： 帶卷 (TR)
Data Sheet
AD7147
Rev. D | Page 17 of 72
CDC CONVERSION SEQUENCE TIME
Table 10. CDC Conversion Times for Full Power Mode
Conversion Time (ms)
SEQUENCE_STAGE_NUM
Decimation = 64
Decimation = 128
Decimation = 256
0
0.768
1.536
3.072
1
1.536
3.072
6.144
2
2.304
4.608
9.216
3
3.072
6.144
12.288
4
3.84
7.68
15.36
5
4.608
9.216
18.432
6
5.376
10.752
21.504
7
6.144
12.288
24.576
8
6.912
13.824
27.648
9
7.68
15.36
30.72
10
8.448
16.896
33.792
11
9.216
18.432
36.864
The time required for the CDC to complete the measurement of
all 12 stages is defined as the CDC conversion sequence time. The
SEQUENCE_STAGE_NUM and DECIMATION bits determine
the conversion time, as listed in Table 10.
For example, if the device is operated with a decimation rate
of 128 and the SEQUENCE_STAGE_NUM bit is set to 5 for the
conversion of six stages in a sequence, the conversion sequence
time is 9.216 ms.
Full Power Mode CDC Conversion Sequence Time
The full power mode CDC conversion sequence time for all
12 stages is set by configuring the SEQUENCE_STAGE_NUM
and DECIMATION bits as outlined in Table 10.
Figure 27 shows a simplified timing diagram of the full power
mode CDC conversion time. The full power mode CDC con-
version time (tCONV_FP) is set using the values shown in Table 10.
CONVERSION
SEQUENCE N
CONVERSION
SEQUENCE N + 1
CONVERSION
SEQUENCE N + 2
CDC
CONVERSION
tCONV_FP
0
66
63
-0
24
Figure 27. Full Power Mode CDC Conversion Sequence Time
Low Power Mode CDC Conversion Sequence Time
with Delay
The frequency of each CDC conversion while operating in the
low power automatic wake-up mode is controlled by using the
LP_CONV_DELAY bits located at Address 0x000[3:2] in
addition to the registers listed in Table 10. This feature provides
some flexibility for optimizing the tradeoff between the conversion
time needed to meet system requirements and the power
consumption of the AD7147.
For example, maximum power savings is achieved when the
LP_CONV_DELAY bits are set to 11. With a setting of 11,
the AD7147 automatically wakes up, performing a conversion
every 800 ms.
Table 11. LP_CONV_DELAY Settings
LP_CONV_DELAY Bits
Delay Between Conversions (ms)
00
200
01
400
10
600
11
800
Figure 28 shows a simplified timing example of the low power
mode CDC conversion time. As shown, the low power mode CDC
conversion time is set by tCONV_FP and the LP_CONV_DELAY bits.
CONVERSION
SEQUENCE N
CONVERSION
SEQUENCE N + 1
CDC
CONVERSION
LP_CONV_DELAY
tCONV_LP
tCONV_FP
0
66
63
-0
25
Figure 28. Low Power Mode CDC Conversion Sequence Time
CDC CONVERSION RESULTS
Certain high resolution sensors require the host to read back the
CDC conversion results for processing. The registers required
for host processing are located in the Bank 3 registers. The host
processes the data read back from these registers using a software
algorithm in order to determine position information.
In addition to the results registers in the Bank 3 registers, the
AD7147 provides the 16-bit CDC output data directly, starting
at Address 0x00B of Bank 1. Reading back the CDC 16-bit
conversion data register allows for customer-specific application
data processing.
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