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MLX90809LXGEAD-000RE Folha de dados(PDF) 5 Page - Melexis Microelectronic Systems

Nome de Peças MLX90809LXGEAD-000RE
Descrição Electrónicos  Relative Pressure Sensor
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Fabricante Electrônico  MELEXIS [Melexis Microelectronic Systems]
Página de início  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

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MLX90809
Relative Pressure Sensor
Rev 002
Page 5 of 11
Data Sheet
390109080901
Oct/14
7 Detailed General Description
The pressure sensing element 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 piezo-resistive elements
have been implanted into the silicon diaphragm, which act as a transducer.
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 SAE J2716 spec dated January 2010.
A broken wire detection block allows actively driving the output to one of the rails in case of a broken supply
or ground connection. Extensive protection of the supply lines allows the MLX90809 to handle extreme
overvoltage conditions and is immune to severe external disturbances. Several diagnostic functions (over-
voltage, under-voltage, overpressure, under pressure detections) have been implemented on the 90809 and
can be enabled by programming EEPROM settings. Figure 2 describes MLX90809 block 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
Figure 2: MLX90809 block diagram


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