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AN695

Title
Title
Interfacing Pressure Sensors to Microchip's Analog Peripherals
Name
Name
AN695
Date
Date
06/24/2015
Application Categories
Application Categories
Home Appliance / Mechatronics
Medical / Homecare CPAP
Medical / Homecare Oxygen Concentrator
Signal Conditioning & Measurement / ADC
Signal Conditioning & Measurement / Amplification (Op Amps)
Product Categories
Product Categories
Linear Devices / Linear Integrated Devices
Linear Devices / Op Amps
Mixed Signal / A D Converters SAR
Description
Description
Pressure measurement devices can be classified into two groups: those where pressure is the only source of power and those that require electrical excitation. The mechanical style devices that are only excited by pressure, such as bellows, diaphragms, bourdons, tubes or manometers, are usually suitable for purely mechanical systems. With these devices a change in pressure will initiate a mechanical reaction, such as a change in the position of mechanical arm or the level of liquid in a tube. This Application Note will concentrate on the signal conditioning path of the piezoresistive sensing element from sensor to microcontroller. It will show how the electrical output of this sensor can be gained, filtered and digitized in order to ready it for the microcontroller?s calibration routines. This theoretical discussion will be followed with a specific pressure sensing design that is specifically designed to measure barometric pressure.

Silicon Products

Title Product Title
MCP3221
12-Bit, 22kSPS, Single Channel ADC w/I2C™
MCP3221 12-Bit, 22kSPS, Single Channel ADC w/I2C™
MCP3021
10-Bit, 22kSPS, Single Channel ADC w/I2C™
MCP3021 10-Bit, 22kSPS, Single Channel ADC w/I2C™
MCP3302
13-Bit, 100kSPS, Dual Channel ADC
MCP3302 13-Bit, 100kSPS, Dual Channel ADC
TC14433
3-1/2 Digit, Analog-to-Digital Converter
TC14433 3-1/2 Digit, Analog-to-Digital Converter
TC7135
TC7135
MCP3004
10-Bit, 200kSPS, 4-Channel ADC
MCP3004 10-Bit, 200kSPS, 4-Channel ADC
MCP3204
12-Bit, 100kSPS, 4-Channel ADC
MCP3204 12-Bit, 100kSPS, 4-Channel ADC
MCP3553
22-Bit, 60SPS, Single Channel ADC
MCP3553 22-Bit, 60SPS, Single Channel ADC
MCP3301
13-Bit, 100kSPS, Single Channel ADC
MCP3301 13-Bit, 100kSPS, Single Channel ADC
MCP3001
10-Bit, 200kSPS, Single Channel ADC
MCP3001 10-Bit, 200kSPS, Single Channel ADC
TC850
15-Bit, Fast Integrating CMOS A/D Converter
TC850 15-Bit, Fast Integrating CMOS A/D Converter
MCP3304
13-Bit, 100kSPS, 4-Channel ADC
MCP3304 13-Bit, 100kSPS, 4-Channel ADC
TC510
Dual Slope ADC
TC510 Dual Slope ADC
TC835
TC835
TC500
Dual Slope ADC
TC500 Dual Slope ADC
MCP3208
12-Bit, 100kSPS, 8-Channel ADC
MCP3208 12-Bit, 100kSPS, 8-Channel ADC
MCP3008
10-Bit, 200kSPS, 8-Channel ADC
MCP3008 10-Bit, 200kSPS, 8-Channel ADC
MCP3202
12-Bit, 100kSPS, Dual Channel ADC
MCP3202 12-Bit, 100kSPS, Dual Channel ADC
MCP3201
12-Bit, 100kSPS, Single Channel ADC
MCP3201 12-Bit, 100kSPS, Single Channel ADC
MCP3002
10-Bit, 200kSPS, Dual Channel ADC
MCP3002 10-Bit, 200kSPS, Dual Channel ADC
MCP3551
22-Bit, 14SPS, Single Channel ADC
MCP3551 22-Bit, 14SPS, Single Channel ADC
MCP6N16
Zero-Drift Instrumentation Amplifier
MCP6N16 Zero-Drift Instrumentation Amplifier
MCP609
2.5V to 6.0V Micropower CMOS Op Amp
MCP609 2.5V to 6.0V Micropower CMOS Op Amp
MCP6231U
20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6231U 20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6054
30 µA, High Precision Op Amps
MCP6054 30 µA, High Precision Op Amps
MCP6284
450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6284 450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6244
50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6244 50 µA, 550 kHz Rail-to-Rail Op Amp
TC7650
Chopper Stabilized Operational Amplifier
TC7650 Chopper Stabilized Operational Amplifier
TC1030
TC1030
TC1035
TC1035
MCP6024
Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP6024 Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP604
2.7V to 6.0V Single Supply CMOS Op Amps
MCP604 2.7V to 6.0V Single Supply CMOS Op Amps
MCP6234
20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6234 20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6271R
170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6271R 170 µA, 2 MHz Rail-to-Rail Op Amp
TC1029
TC1029
TC1026
TC1026
TC911A
TC911A
MCP6064
60 µA, High Precision Op Amps
MCP6064 60 µA, High Precision Op Amps
MCP6291R
1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6291R 1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6281R
450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6281R 450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6231R
20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6231R 20 µA, 300 kHz Rail-to-Rail Op Amp
TC1034
TC1034
MCP6074
110 µA, High Precision Op Amps
MCP6074 110 µA, High Precision Op Amps
MCP6034
0.9 µA, High-Precision Op Amps
MCP6034 0.9 µA, High-Precision Op Amps
MCP6044
600 nA, Rail-to-Rail Input/Output Op Amps
MCP6044 600 nA, Rail-to-Rail Input/Output Op Amps
MCP6241R
50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6241R 50 µA, 550 kHz Rail-to-Rail Op Amp
MCP619
2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP619 2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP6022
Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP6022 Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP602
2.7V to 6.0V Single Supply CMOS Op Amps
MCP602 2.7V to 6.0V Single Supply CMOS Op Amps
MCP601
2.7V to 6.0V Single Supply CMOS Op Amps
MCP601 2.7V to 6.0V Single Supply CMOS Op Amps
MCP6V02
300 µA, Auto-Zeroed Op Amps
MCP6V02 300 µA, Auto-Zeroed Op Amps
MCP6042
600 nA, Rail-to-Rail Input/Output Op Amps
MCP6042 600 nA, Rail-to-Rail Input/Output Op Amps
MCP6043
600 nA, Rail-to-Rail Input/Output Op Amps
MCP6043 600 nA, Rail-to-Rail Input/Output Op Amps
MCP617
2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP617 2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP6242
50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6242 50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6231
20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6231 20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6052
30 µA, High Precision Op Amps
MCP6052 30 µA, High Precision Op Amps
MCP6441
450 nA, 9 kHz Op Amp
MCP6441 450 nA, 9 kHz Op Amp
MCP6031
0.9 µA, High-Precision Op Amps
MCP6031 0.9 µA, High-Precision Op Amps
MCP6004
1 MHz, Low-Power Op Amp
MCP6004 1 MHz, Low-Power Op Amp
MCP603
2.7V to 6.0V Single Supply CMOS Op Amps
MCP603 2.7V to 6.0V Single Supply CMOS Op Amps
MCP6001
1 MHz, Low-Power Op Amp
MCP6001 1 MHz, Low-Power Op Amp
MCP607
2.5V to 6.0V Micropower CMOS Op Amp
MCP607 2.5V to 6.0V Micropower CMOS Op Amp
MCP6142
600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6142 600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6143
600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6143 600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6283
450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6283 450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6271
170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6271 170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6272
170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6272 170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6274
170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6274 170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6241
50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6241 50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6051
30 µA, High Precision Op Amps
MCP6051 30 µA, High Precision Op Amps
MCP6032
0.9 µA, High-Precision Op Amps
MCP6032 0.9 µA, High-Precision Op Amps
MCP6062
60 µA, High Precision Op Amps
MCP6062 60 µA, High Precision Op Amps
TC7652
400 kHz, Single Zero-Drift Op Amp
TC7652 400 kHz, Single Zero-Drift Op Amp
MCP6241U
50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6241U 50 µA, 550 kHz Rail-to-Rail Op Amp
MCP6294
1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6294 1.0 mA, 10 MHz Rail-to-Rail Op Amp
TC1043
TC1043
MCP6021
Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP6021 Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP6002
1 MHz, Low-Power Op Amp
MCP6002 1 MHz, Low-Power Op Amp
MCP6V01
300 µA, Auto-Zeroed Op Amps
MCP6V01 300 µA, Auto-Zeroed Op Amps
MCP6V06
300 µA, Auto-Zeroed Op Amps
MCP6V06 300 µA, Auto-Zeroed Op Amps
MCP6V07
300 µA, Auto-Zeroed Op Amps
MCP6V07 300 µA, Auto-Zeroed Op Amps
MCP6V03
300 µA, Auto-Zeroed Op Amps
MCP6V03 300 µA, Auto-Zeroed Op Amps
MCP6V08
300 µA, Auto-Zeroed Op Amps
MCP6V08 300 µA, Auto-Zeroed Op Amps
MCP608
2.5V to 6.0V Micropower CMOS Op Amp
MCP608 2.5V to 6.0V Micropower CMOS Op Amp
MCP618
2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP618 2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP6273
170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6273 170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6232
20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6232 20 µA, 300 kHz Rail-to-Rail Op Amp
MCP6072
110 µA, High Precision Op Amps
MCP6072 110 µA, High Precision Op Amps
MCP6N11
500 kHz, 800 µA Instrumentation Amplifier
MCP6N11 500 kHz, 800 µA Instrumentation Amplifier
MCP6144
600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6144 600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6023
Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP6023 Rail-to-Rail Input/Output, 10 MHz Op Amps
MCP6041
600 nA, Rail-to-Rail Input/Output Op Amps
MCP6041 600 nA, Rail-to-Rail Input/Output Op Amps
MCP6141
600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP6141 600 nA, Non-Unity Gain Rail-to-Rail Input/Out
MCP606
2.5V to 6.0V Micropower CMOS Op Amp
MCP606 2.5V to 6.0V Micropower CMOS Op Amp
MCP6281
450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6281 450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6291
1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6291 1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6293
1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6293 1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP616
2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP616 2.3V to 5.5V Micropower Bi-CMOS Op Amps
MCP6282
450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6282 450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6292
1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6292 1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6285
450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6285 450 µA, 5 MHz Rail-to-Rail Op Amp
MCP6295
1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6295 1.0 mA, 10 MHz Rail-to-Rail Op Amp
MCP6275
170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6275 170 µA, 2 MHz Rail-to-Rail Op Amp
MCP6071
110 µA, High Precision Op Amps
MCP6071 110 µA, High Precision Op Amps
MCP6033
0.9 µA, High-Precision Op Amps
MCP6033 0.9 µA, High-Precision Op Amps
MCP6061
60 µA, High Precision Op Amps
MCP6061 60 µA, High Precision Op Amps