ACSHIELD OUTPUT The AD7147A measures the " />
參數(shù)資料
型號(hào)： AD7147AACBZ-500RL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 26/69頁(yè)
文件大小： 0K
描述： IC CDC 13CH SPI W/RAM 25WLCSP
產(chǎn)品變化通告： 8mm Carrier Tape Changes 28/Feb/2012
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： 25-UFBGA，WLCSP
供應(yīng)商設(shè)備封裝： 25-WLCSP
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： AD7147AACBZ-500RL7DKR
AD7147A
Rev. B | Page 31 of 68
OUTPUTS
ACSHIELD OUTPUT
The AD7147A measures the capacitance between CINx and
ground. Any capacitance to ground on the signal path between
the CINx pins and the sensor is included in the AD7147A
conversion result.
To eliminate stray capacitance to ground, the ACSHIELD signal should
be used to shield the connection between the sensor and CINx,
as shown in Figure 46. The plane around the sensors should also
be connected to ACSHIELD.
CIN0
CIN1
CIN2
CIN3
ACSHIELD
AD7147A
SE
N
SO
R
PC
B
GND
07
72
7-
0
46
Figure 46. ACSHIELD
The ACSHIELD output is the same signal waveform as the excitation
signal on CINx. Therefore, there is no ac current between CINx
and ACSHIELD, and any capacitance between these pins does not
affect the CINx charge transfer.
Using ACSHIELD eliminates capacitance-to-ground pickup, which
means that the AD7147A can be placed up to 10 cm away from
the sensors. This allows the AD7147A to be placed on a separate
PCB from that of the sensors if the connections between the
sensors and the CINx inputs are correctly shielded using
ACSHIELD.
GENERAL-PURPOSE INPUT/OUTPUT (GPIO)
The AD7147A has one GPIO pin. It can be configured as an input
or an output. The GPIO_SETUP Bits[13:12] in the STAGE_LOW_
INT_ENABLE register determine how the GPIO pin is configured.
Table 17. GPIO_SETUP Bits
GPIO_SETUP
GPIO Configuration
00
GPIO disabled
01
Input
10
Output low
11
Output high
When the GPIO is configured as an output, the voltage level on
the pin is set to either a low level or a high level, as defined by
the GPIO_SETUP bits (see Table 17).
The GPIO_INPUT_CONFIG bits in the STAGE_LOW_INT_
ENABLE register determine the response of the AD7147A to a
signal on the GPIO pin when the GPIO is configured as an
input. The GPIO can be configured as either active high or
active low, as well as either edge triggered or level triggered (see
Table 18. GPIO_INPUT_CONFIG Bits
GPIO_INPUT_CONFIG
GPIO Configuration
00
Triggered on negative level (active low)
01
Triggered on positive edge (active high)
10
Triggered on negative edge (active low)
11
Triggered on positive level (active high)
When GPIO is configured as an input, it triggers the interrupt
output on the AD7147A.
Table 16 lists the interrupt output behavior for each of the GPIO
configuration setups.
USING THE GPIO TO TURN ON/OFF AN LED
The GPIO on the AD7147A can be used to turn an LED on and
off by setting the GPIO as either output high or low. Setting the
GPIO output high turns on the LED; setting the GPIO output
low turns off the LED. The GPIO pin connects to a transistor
that provides the drive current for the LED. Suitable transistors
include the KTC3875 from Korea Electronics Co., Ltd. (KEC).
AD7147A
GPIO
VCC
KTC3875
OR SIMILAR
07
72
7-
0
47
Figure 47. Controlling an LED Using the GPIO
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