MLX90809

Relative Pressure Sensor

Rev 002

Page 2 of 11

Data Sheet

390109080901

Oct/14

1 Functional Diagram

OPA

ADC

Temperature

sensor

Gain & Offset

compensation

16 bits

DSP

Rom

FW

Ram

EE

PROM

Pressure Linearization

Gain & Offset temperature

compensation

Programmable filter

Micro controller

DAC

Gain

Analog

Output

12 bits

Slew

rate

control

SENT

Output

Piezoresistive

sensing element

Overvoltage &

reverse voltage

protection

Analog & Digital

Regulator and

POR

Broken wire

detection

SENT driver

Analog driver

Ground

Vext

Diagnostic signals

Diagnostics Logic

Test

M

U

X

2 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 90809 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.

3 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

4 Absolute Maximum Ratings

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-

rated conditions for extended periods may affect device reliability.

Parameter

Remarks

Value

Units

Supply Voltage (overvoltage)

Remark 1

18

V

Reverse Voltage Protection

Remark 2

-14

V

Positive output voltage

Remark 1

18

V

Reverse output voltage

Remark 1

-0.5

V

Operating Temperature Range

-40 to 150

C

Storage Temperature Range

-40 to 150

C

Burst pressure (Room Temperature)

(AEC Q100 002)

5

Bar

Table 1: Absolute maximum ratings

Remark 1: No time limit or temperature limit for these over voltage conditions.

Remark 2: Reverse Voltage Protection at -14V at 150

C for maximum 1 hour. At Room Temperature that

condition can apply for maximum 24 hours.