参数资料
型号: MCP3426A0-E/MS
厂商: Microchip Technology
文件页数: 26/56页
文件大小: 0K
描述: IC ADC 16BIT I2C PROGBL 8-MSOP
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-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
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 32
2009 Microchip Technology Inc.
Figure 6-6, shows an example of using the MCP3428
for
four-channel
thermocouple
temperature
measurement applications.
FIGURE 6-6:
Four-Channel Thermocouple Applications.
With
Type
K
thermocouple,
it
can
measure
temperature from 0°C to +1250°C degrees. The full
scale output range of the Type K thermocouple is
about 50 mV. This provides 40 V/°C (= 50 mV/
1250°C) of measurement resolution. Equation 6-1
shows the measurement budget for sensor signal using
the MCP3426/7/8 device with 16 bits and PGA = 8
settings. With this configuration, the MCP3428 can
detect the input signal level as low as approximately
7.8 V. By setting the internal PGA option to x8, the
40 V/°C input from the thermocouple is amplified
internally to 320 V/°C before the conversion takes
place. This results in about 5 LSB output codes per
1°C of change in temperature, with 16-bit conversion
mode.
EQUATION 6-1:
5k
Ω
VDD
4
5
6
9
CH2-
VSS
CH3+
3
12
CH2+
CH3-
2
13
CH1-
CH4+
1
14
CH1+
CH4-
7
8
SDA
SCL
VDD
MCP3428
11
10
0.1 F
10 F
TO MCU
(MASTER)
MCP9800
Isothermal Block
Thermocouple Sensor
Heat
SCL
SDA
SCL
SDA
SCL
VDD
SDA
SCL
SDA
SCL
Adr1
Adr0
5k
Ω
Input Signal Level after gain of 8:
Where:
1 LSB
=
62.5 V with 16 bit configuration
Detectable Input Signal Level
62.5
μV/PGA
=
7.8125
μV for PGA
8
=
40
μV/°C
() 8
320
μV/°C
=
=
No. of LSB/°C
320
μV/°C
62.5
μV
-------------------------
5.12 Codes/°C
==
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