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參數(shù)資料
型號(hào)： AD7156BCPZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 0K
描述： IC CDC 2CH 12BIT 1.8V 10LFCSP
標(biāo)準(zhǔn)包裝： 1
類型： 電容數(shù)字轉(zhuǎn)換器
分辨率（位）： 12 b
采樣率（每秒）： 100k
數(shù)據(jù)接口： 串行
電壓電源： 單電源
電源電壓： 1.8 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 10-WFDFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 10-LFCSP-WD（3x3）
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 781 (CN2011-ZH PDF)
其它名稱： AD7156BCPZ-REEL7DKR
AD7156
Rev. 0 | Page 24 of 28
HARDWARE DESIGN CONSIDERATIONS
OVERVIEW
The AD7156 is an interface to capacitive sensors.
On the input side, Sensor CX can be connected directly between
the AD7156 EXC and CIN pins. The way it is connected and the
electrical parameters of the sensor connection, such as parasitic
resistance or capacitance, can affect the system performance.
Therefore, any circuit with additional components in the capacitive
front end, such as overvoltage protection, has to be carefully
designed, considering the AD7156 specified limits and informa-
tion provided in this section.
On the output side, the AD7156 can work as a standalone device,
using the power-up default register settings and flagging the
result on the digital outputs. Alternatively, the AD7156 can be
interfaced to a microcontroller via the 2-wire serial interface,
offering flexibility by overwriting the AD7156 register values
from the host with a user-specific setup.
PARASITIC CAPACITANCE TO GROUND
DATA
CDC
EXC
CGND1
CIN
CGND2
CX
07
72
6-
0
52
Figure 42. Parasitic Capacitance to Ground
The CDC architecture used in the AD7156 measures the
capacitance, CX, connected between the EXC pins and the
CIN pins. In theory, any capacitance, CGND, to ground should
not affect the CDC result (see Figure 42).
The practical implementation of the circuitry in the chip implies
certain limits, and the result is gradually affected by capacitance
to ground (for information about the allowed capacitance to
GND for CIN and information about excitation see Table 1
PARASITIC RESISTANCE TO GROUND
DATA
CDC
EXC
RGND1
CIN
RGND2
CX
07
72
6-
0
53
Figure 43. Parasitic Resistance to Ground
The AD7156 CDC result is affected by a leakage current from
CX to ground; therefore, CX should be isolated from the ground.
The equivalent resistance between CX and ground should be
maximized (see Figure 43). For more information, see Figure 10
PARASITIC PARALLEL RESISTANCE
DATA
CDC
EXC
CIN
RP
CX
07
72
6-
05
4
Figure 44. Parasitic Parallel Resistance
The AD7156 CDC measures the charge transfer between the
EXC and CIN pins. Any resistance connected in parallel to the
measured capacitance, CX (see Figure 44), such as the parasitic
resistance of the sensor, also transfers charge. Therefore, the
parallel resistor is seen as an additional capacitance in the
output data. The equivalent parallel capacitance (or error
caused by the parallel resistance) can be approximately
calculated as
4
1
×
=
EXC
P
f
R
C
where:
RP is the parallel resistance.
fEXC is the excitation frequency.
For additional information, see Figure 15.
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