EAD-000 = 0.05 to -1.05 bar relative pressure / 0.5 to 4.5 V analog output
EAD-003 = 0 to 1 bar relative pressure / 0.5 to 4.5 V analog output
EAD-100 = 0.05 to -1.2 bar relative pressure / 193 to 3896 LSB SENT output
REVISION 004 – JULY 2017
390109080901
MLX90809
Relative Pressure Sensor
4. Functional Diagram
Test
Broken wire
detection
Overvoltage &
reverse voltage
protection
Vext
Temperature
sensor
Piezoresistive
sensing element
Gain & Offset
compensation
DSP
Micro controller
M
U
X
ADC
16 bits
Gain & Offset temperature
compensation
Pressure Linearization
Programmable filter
Diagnostics Logic
Analog & Digital
Regulator and
POR
Analog driver
OPA
DAC
12 bits
Gain
Analog
Output
SENT driver
Diagnostic signals
Rom
FW
EE
PROM
Ram
Slew
rate
control
SENT
Output
Ground
5. General Description
The MLX90809 is a packaged, factory calibrated, integrated relative pressure sensor delivering a ratiometric
analog or digital (using the SENT protocol) signal.
Use of an optimized architecture and a high density CMOS technology imparts the MLX90809 with best in class
automotive EMC performance. A DSP based architecture using a 16bit microcontroller provides outstanding
performance.
A smart package and die assembly concept suits applications with stringent automotive temperature and stress
conditions needing small drift over life.
6. Glossary of Terms
Bar: Pressure unit (1bar = 100kPa)
ADC: Analog to Digital Converter
DAC: Digital to Analog Converter
DSP: Digital Signal Processor
EMC: Electro Magnetic Compatibility
SENT: Single Edge Nibble Transmission
FSO: Full Span Output
REVISION 004 – JULY 2017
390109080901
Page 2 of 14
MLX90809
Relative Pressure Sensor
Contents
1. Features and Benefits ............................................................................................................................ 1
5. General Description ............................................................................................................................... 2
6. Glossary of Terms .................................................................................................................................. 2
7. Absolute Maximum Ratings ................................................................................................................... 4
8. Pin Definitions and Descriptions ............................................................................................................ 4
9. General Electrical Specifications ............................................................................................................ 6
10. Detailed General Description............................................................................................................... 8
The MCU source code is as follows: /* * Simple low power multimeter*/ #include
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