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參數(shù)資料
| 型號： | MCP3424EV |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 29/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVALUATION BOARD FOR MCP3424 |
| 產(chǎn)品培訓(xùn)模塊： | MCP3901 Analog Front End |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 3.75 ~ 240 |
| 數(shù)據(jù)接口： | I²C |
| 輸入范圍： | ±2.048 V |
| 在以下條件下的電源（標準）： | 135µA @ 240sps |
| 工作溫度： | -55°C ~ 125°C |
| 已用 IC / 零件： | MCP3424 |
| 已供物品： | 板 |
| 產(chǎn)品目錄頁面： | 672 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | MCP3424T-E/STTR-ND - IC ADC 18BIT 3.75SPS 4CH 14TSSOP MCP3424T-E/SLTR-ND - IC ADC 18BIT 3.75SPS 4CH 14-SOIC MCP3424-E/ST-ND - IC ADC 18BIT 3.75SPS 4CH 14TSSOP MCP3424-E/SL-ND - IC ADC 18BIT 3.75SPS 4CH 14-SOIC |
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2009 Microchip Technology Inc.
DS22088C-page 35
MCP3422/3/4
Equation 6-2 shows an example of calculating the
expected number of output code with various PGA gain
settings for Type K thermocouple output.
EQUATION 6-2:
EXPECTED NUMBER OF
OUTPUT CODE FOR TYPE
K THERMOCOUPLE
FIGURE 6-7:
Example of Pressure and Temperature Measurement.
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.
log
2
50 mV
15.625
μV
PGA
------------------------
= 11.6 bits for PGA = 1
= 12.6 bits for PGA = 2
= 13.6 bits for PGA = 4
= 14.6 bits for PGA = 8
Expected
Number of Output Code =
Where:
1 LSB
=
15.625 V with 18 Bit configuration.
5k
Ω
VDD
4
5
6
9
CH2-
VSS
CH3+
Adr1
Adr0
3
12
CH2+
CH3-
2
13
CH1-
CH4+
1
14
CH1+
CH4-
7
8
SDA
SCL
VDD
11
10
0.1 F
10 F
TO MCU
(MASTER)
5k
Ω
VDD
Thermistor
VDD
Pressure Sensor
VDD
R1
R2
Thermistor
R2
R1
R1 and R2 = Voltage Divider
V
IN
R
2
R
1
R
2
+
-------------------
V
DD
×
=
(NPP301)
Pressure Sensor
(NPP301)
VIN
MCP3424
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