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MCP3426 Datasheet(PDF) 33 Page - Microchip Technology

Part # MCP3426
Description  16-Bit, Multi-Channel ?誇 Analog-to-Digital Converter with I2C??Interface and On-Board Reference
PDF  56 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3426 Datasheet(HTML) 33 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22226A-page 33
MCP3426/7/8
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.
log
2
50 mV
62.5
μV
PGA
------------------
------------------
⎝⎠
⎜⎟
⎜⎟
⎛⎞
= 9.6 bits for PGA = 1
= 10.6 bits for PGA = 2
= 11.6 bits for PGA = 4
= 12.6 bits for PGA = 8
Expected
Number of Output Code =
Where:
1 LSB
=
62.5 µV with 16 Bit configuration.
800
PGA
•
()
ln
2
()
ln
-------------------------------------
⎝⎠
⎛⎞
=
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
MCP3428
11
10
0.1 µF
10 µF
TO MCU
(MASTER)
5k
Ω
VDD
Thermistor
VDD
Pressure Sensor
VDD
VDD
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
VIN



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