MLX90821 datasheet(2/40 Pages) MELEXIS

2 / 40 page

MLX90821

Relative Pressure Sensor IC

Page 2 of 40

REV 004 – 4 MAR 2021

3901090821

Functional Diagram

Analog

Output

Piezoresistive

sensing element

Overvoltage &

reverse voltage

protection

Voltage regulator

POR

Gnd

Vsupply

Test

Vbrg

InP

InN

Test

On chip temperature

sensor

OPA

ADC

InP, InN, VEXT

PGA

16 bits

DSP

Rom

Pressure Linearization

Gain & Offset

Temperature

Compensation

Programmable Filter

Vana

Oscillator

EEPROM

Ram

Sensor bias

Off chip temperature

sensor current output

IV conversion

6/7 VDDA

Divided bridge

current

DAC

Gain

12 bits

External NTC

interface

SENT

Output

NTC

Input

Figure 1: Functional block diagram

General Description

The MLX90821 is a packaged, factory calibrated,

relative pressure sensor delivering a ratiometric

analog output or a digital signal using the SENT

protocol.

Using a best in class MEMS sensor enables reliably

and accurately measuring very low pressures of a

few tenths of millibars. An optimized architecture

and a high density CMOS technology imparts the

MLX90821 with best in class automotive EMC

performance. A DSP based architecture using a 16bit

microcontroller provides outstanding performance

in terms of initial accuracy of both pressure and

optionally external NTC temperature.

A smart package and die assembly concept suits

applications with stringent automotive temperature

and stress conditions needing small drift over life.

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