参数资料
型号: MCP3422A0-E/MC
厂商: Microchip Technology
文件页数: 27/58页
文件大小: 0K
描述: IC ADC 18BIT 3.75SPS 2CH 8-DFN
产品培训模块: MCP3901 Analog Front End
标准包装: 150
位数: 18
采样率(每秒): 3.75
数据接口: I²C,串行
转换器数目: 1
电压电源: 单电源
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-VFDFN 裸露焊盘
供应商设备封装: 8-DFN(2x3)
包装: 管件
输入数目和类型: 4 个单端,双极;2 个差分,双极
产品目录页面: 672 (CN2011-ZH PDF)
配用: MCP3422EV-ND - BOARD EVAL MCP3422 PICKIT SERIAL
2009 Microchip Technology Inc.
DS22088C-page 33
MCP3422/3/4
6.2
Application Examples
The MCP3422/3/4 devices can be used for broad
ranges of sensor and data acquisition applications.
Figure 6-5 shows a circuit example measuring both the
battery voltage and current using the MCP3422 device.
Channels 1 and 2 are measuring the voltage and the
current, respectively.
When the input voltage is greater than the internal ref-
erence voltage (VREF = 2.048V), it needs a voltage
divider circuit to prevent the output code from being
saturated. In the example, R1 and R2 form a voltage
divider. The R1 and R2 are set to yield VIN to be less
than the internal reference voltage (VREF = 2.048V).
For the current measurement, the device measure the
voltage across the current sensor, and converts it by
dividing the measured voltage by a known resistance
value. The voltage drops across the sensor is waste.
Therefore, the current measurement often prefers to
use a current sensor with smaller resistance value,
which, in turn, requires high resolution ADC device.
The device can measure the input voltage as low as
2 V range (or current in ~ A range) with 18 bit
resolution and PGA = 8 settings.
The MSB (= sign bit) of the output code determines the
direction of the current, which identifies the charging or
the discharging current.
FIGURE 6-5:
Battery Voltage and Charging/Discharging Current Measurement.
5k
Ω
VDD
VSS
0.1 F
10 F
To MCU
(MASTER)
SCL
SDA
5k
Ω
CH2+
SCL
CH2-
R1
R2
Battery
(Rechargeable)
2
3
4
5
6
7
CH1-
SDA
1
8
CH1+
VDD
Current Sensor
To Load
To Battery
Discharging Current
Charging
Current
R1 and R2 = Voltage Divider
V
IN
R
2
R
1
R
2
+
------------------
V
BAT
×
=
VIN
VBAT
MCP3422
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