参数资料
型号: MCP3426A0-E/SN
厂商: Microchip Technology
文件页数: 28/56页
文件大小: 0K
描述: IC ADC 16BIT I2C PROGBL 8-SOIC
产品培训模块: MCP3901 Analog Front End
标准包装: 100
位数: 16
采样率(每秒): 15
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-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOICN
包装: 管件
输入数目和类型: 2 个差分,单极
产品目录页面: 672 (CN2011-ZH PDF)
MCP3426/7/8
DS22226A-page 34
2009 Microchip Technology Inc.
Figure 6-7 shows an example of measuring both
pressure and temperature. The pressure is measured
by using NPP 301 (manufactured by GE NovaSensor),
and temperature is measured by a thermistor. The
pressure sensor output is 20 mV/V. This gives 100 mV
of full scale output for VDD of 5V (sensor excitation
voltage). Equation 6-3 shows an example of calculating
the number of output code for the full scale output of the
NPP301.
EQUATION 6-3:
EXPECTED NUMBER OF
OUTPUT CODE FOR
NPP301 PRESSURE
SENSOR
The thermistor temperature sensor can measure the
temperature range from -100°C to +300°C. The
resistance of the thermistor sensor decreases as
temperature
increases
(negative
temperature
coefficient). As shown in Figure 6-7, the thermistor (R2)
forms a voltage divider with R1.
The thermistor sensor is simple to use and widely used
for the temperature measurement applications. It has
both linear and non-linear responses over temperature
range. R1 is used to adjust the linear region of interest
for measurement.
Expected
log
2
100 mV
62.5
μV
PGA
------------------
---------------------
= 10.6 bits for PGA = 1
= 11.6 bits for PGA = 2
= 12.6 bits for PGA = 4
= 13.6 bits for PGA = 8
Number of Output Code =
Where:
1 LSB
=
62.5 V with 16 Bit configuration.
1600
PGA
()
ln
2
()
ln
----------------------------------------
=
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