參數(shù)資料
型號(hào)： MCP3423EV
廠商： Microchip Technology
文件頁(yè)數(shù)： 27/58頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL 18BIT 2CH ADC MCP3423
產(chǎn)品培訓(xùn)模塊： MCP3901 Analog Front End
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 18
采樣率（每秒）： 3.75
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF
工作溫度： -40°C ~ 125°C
已用 IC / 零件： MCP3423
已供物品： 板
產(chǎn)品目錄頁(yè)面： 672 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： MCP3423T-E/UNTR-ND - IC ADC 18BIT 3.75SPS 2CH 10-MSOP
MCP3423T-E/MFTR-ND - IC ADC 18BIT 3.75SPS 2CH 10-DFN
MCP3423-E/UN-ND - IC ADC 18BIT 3.75SPS 2CH 10-MSOP
MCP3423-E/MF-ND - IC ADC 18BIT 3.75SPS 2CH 10-DFN
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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