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參數(shù)資料
| 型號(hào)： | MCP3427-E/MF |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 26/56頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT I2C PROGBL 10-DFN |
| 產(chǎn)品培訓(xùn)模塊： | MCP3901 Analog Front End |
| 標(biāo)準(zhǔn)包裝： | 120 |
| 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 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-VFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-DFN-EP（3x3） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個(gè)差分，單極 |
| 產(chǎn)品目錄頁面： | 672 (CN2011-ZH PDF) |
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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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