MLX90821 datasheet(8/40 Pages) MELEXIS

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MLX90821

Relative Pressure Sensor IC

Page 8 of 40

REV 004 – 4 MAR 2021

3901090821

Parameter

Symbol

Remarks

Min

Typ(1)

Max

Units

Analog saturation output

level

Vsat high Pull-up ≥ 4.7kΩ

Pull-down ≥ 4.7kΩ

Pull-down ≥ 10kΩ

100

%Vdd

Vsat low

Pull-up ≥ 4.7kΩ

Pull-down ≥ 4.7kΩ

%Vdd

Power up time analog

Time from reaching minimum allowed

supply voltage of 4.5V till having the

output within specification

1.3

Power up time SENT

Time from reaching minimum allowed

supply voltage of 4.5V till the first falling

edge of the first SENT frame

1.1

Pressure response time

analog

Time needed for the output to change

from an input pressure step to 90% of its

final value. Capacitive load 100nF.

Using default filter settings PFLT=0 and

SSF=1.

For response times using different filter

settings see Table 11.

Pressure response time

SENT(4)

Default filter setting PFLT = 0 and SSF = 1.

Tick time = 3us and Pause Pulse enabled.

For other configurations refer to Table 11

in chapter 12.1.

SENT

frames

InP InN digital diagnostic

levels

Diagnostic thresholds of 25% of VDDA

(low) and 75% of VDDA (high)

-16384

16384

lsb

Pressure output noise

analog

BW limited to 50kHz.

mVrms

Input voltage range on

NTC pin

3.5

Table 4: Electrical specifications

Detailed General Description

The MLX90821 contains a pressure sensing element which consists of a square diaphragm realized in the

silicon chip by backside etching. The diaphragm reacts to a pressure difference between the top and bottom

side of the diaphragm. The internal strain increases, in particular at the border of the diaphragm. Here, the

piezoresistive elements have been implanted into the silicon diaphragm, which act as a transducer.

The sensor interface containing the readout circuit is integrated in the same package as the sensing element.

The electronics front end amplifies the signal from the bridge, performs a coarse offset compensation and

an ADC conversion. The DSP performs the compensations over temperature. Furthermore, the digital circuit

provides some filtering, the possibility to linearize the pressure signal and also implements the clamping

function. The analog back end consists of a 12 bit DAC and an output driver. This chip delivers an analog

output proportional to the pressure or a SENT output compliant with the rev 4 from April 2016 of the SAE

J2716 specification. An accurate factory calibrated external NTC temperature is also available on the SENT

output.

4 Number of SENT frames between pressure step and settled output (last frame containing stable pressure data)

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