MCP3422EV Microchip Technology, MCP3422EV Datasheet - Page 35
![BOARD EVAL MCP3422 PICKIT SERIAL](/photos/9/10/91090/mcp3422ev_sml.jpg)
MCP3422EV
Manufacturer Part Number
MCP3422EV
Description
BOARD EVAL MCP3422 PICKIT SERIAL
Manufacturer
Microchip Technology
Series
PICkit™r
Specifications of MCP3422EV
Number Of Adc's
2
Number Of Bits
18
Sampling Rate (per Second)
3.75
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±2.048 V
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Utilized Ic / Part
MCP3422
Silicon Manufacturer
Microchip
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
MCP3422
Kit Contents
Board, Software
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Equation 6-2
expected number of output code with various PGA gain
settings for Type K thermocouple output.
EQUATION 6-2:
FIGURE 6-7:
Figure 6-7
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 V
© 2009 Microchip Technology Inc.
Where:
Expected
Number of Output Code =
1 LSB = 15.625 µV with 18 Bit configuration.
Thermistor
shows an example of measuring both
shows an example of calculating the
V
DD
V
R
DD
R
1
2
Pressure Sensor
EXPECTED NUMBER OF
OUTPUT CODE FOR TYPE
K THERMOCOUPLE
Example of Pressure and Temperature Measurement.
(NPP301)
= 11.6 bits for PGA = 1
= 12.6 bits for PGA = 2
= 13.6 bits for PGA = 4
= 14.6 bits for PGA = 8
log
2
⎛
⎜
⎜
⎝
0.1 µF
----------------------- -
15.625
----------------------- -
DD
50 mV
V
PGA
10 µF
IN
of 5V (sensor
μ
V
⎞
⎟
⎟
⎠
V
R
IN
1
1
2
3
4
5
6
7
5 kΩ
and R
CH1+
CH1-
CH2+
CH2-
V
V
SDA
=
SS
DD
MCP3424
------------------ -
R
2
1
R
= Voltage Divider
+
2
R
CH4+
CH3+
2
CH4-
CH3-
Adr1
Adr0
SCL
×
V
excitation voltage).
calculating the number of output code for the full scale
output of the NPP301.
5 kΩ
DD
13
10
14
12
11
9
8
V
IN
V
DD
(MASTER)
V
T
DD
O
Equation 6-3
MCP3422/3/4
MCU
V
DD
R
R
2
shows an example of
1
Pressure Sensor
V
DD
DS22088C-page 35
(NPP301)
Thermistor