參數(shù)資料
型號(hào): MCP3426A0-E/SN
廠(chǎng)商: Microchip Technology
文件頁(yè)數(shù): 28/56頁(yè)
文件大?。?/td> 0K
描述: IC ADC 16BIT I2C PROGBL 8-SOIC
產(chǎn)品培訓(xùn)模塊: MCP3901 Analog Front End
標(biāo)準(zhǔn)包裝: 100
位數(shù): 16
采樣率(每秒): 15
數(shù)據(jù)接口: I²C,串行
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
工作溫度: -40°C ~ 125°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOICN
包裝: 管件
輸入數(shù)目和類(lèi)型: 2 個(gè)差分,單極
產(chǎn)品目錄頁(yè)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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