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参数资料
| 型号： | AD7147WPACPZ-500R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 28/73页 |
| 文件大小： | 0K |
| 描述： | IC CAP-TO-DGTL CONV PROG 24LFCSP |
| 标准包装： | 500 |
| 系列： | CapTouch™ |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 16 b |
| 采样率（每秒）： | 250k |
| 数据接口： | 串行，SPI? |
| 电压电源： | 单电源 |
| 电源电压： | 2.6 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 带卷 (TR) |
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Data Sheet
AD7147
Rev. D | Page 33 of 72
OUTPUTS
ACSHIELD OUTPUT
The AD7147 measures capacitance between CINx and ground.
Any capacitance to ground on the signal path between the CINx
pins and the sensor is included in the AD7147 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 47. The plane around the sensors should also
be connected to ACSHIELD.
CIN0
CIN1
CIN2
CIN3
ACSHIELD
AD7147
SE
N
SO
R
PC
B
GND
06
66
3-
0
44
Figure 47. 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 AD7147 can be placed up to 10 cm away from
the sensors. This allows the AD7147 to be placed on a separate
PCB than 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 AD7147 has one GPIO pin. It can be configured as an input or
an output. The GPIO_SETUP Bits[13:12] in the interrupt enable
register determine how the GPIO pin is configured.
Table 16. 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 16).
The GPIO_INPUT_CONFIG bits in the interrupt enable
register determine the response of the AD7147 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 17).
Table 17. 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 AD7147. Table 15 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 AD7147 can be used to turn on and off an
LED 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).
AD7147
GPIO
VCC
KTC3875
OR SIMILAR
06
66
3-
04
5
Figure 48. Controlling an LED Using the GPIO
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