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| 型号： | MCP3422EV |
| 厂商： | Microchip Technology |
| 文件页数： | 27/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MCP3422 PICKIT SERIAL |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 系列： | PICkit™ |
| ADC 的数量： | 2 |
| 位数： | 18 |
| 采样率（每秒）： | 3.75 |
| 数据接口： | 串行 |
| 输入范围： | ±2.048 V |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | MCP3422 |
| 已供物品： | 板 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 相关产品： | MCP3422A0T-E/SNTR-ND - IC ADC 18BIT 3.75SPS 2CH 8-SOIC MCP3422A0T-E/MSTR-ND - IC ADC 18BIT 3.75SPS 2CH 8-MSOP MCP3422A0T-E/MCTR-ND - IC ADC 18BIT 3.75SPS 2CH 8-DFN MCP3422A0-E/SN-ND - IC ADC 18BIT3.75SPS 2CH 8-SOIC MCP3422A0-E/MS-ND - IC ADC 18BIT 3.75SPS 2CH 8-MSOP MCP3422A0-E/MC-ND - IC ADC 18BIT 3.75SPS 2CH 8-DFN |
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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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