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MLX90269 데이터시트 PDF




Melexis에서 제조한 전자 부품 MLX90269은 전자 산업 및 응용 분야에서
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부품번호 MLX90269 기능
기능 Absolute Integrated Pressure Sensor
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MLX90269 데이터시트, 핀배열, 회로
MLX90269
Absolute Integrated Pressure Sensor
Features and Benefits
Absolute Integrated Pressure sensor
Less than ±1% error range overall
Programmable through the connector (3 pins)
Trimmable offset and sensitivity
On-Chip Signal Conditioning
Output proportional to the applied pressure
Ratiometric output
Rail-to-rail output
Diagnostics of broken supply wires and broken sensor
Output protected against short-circuits at both battery terminals
Different pressure ranges available
Application Examples
Water pressure
Oil pressure
Manifold Air Pressure
Ordering Information
Part No.
MLX90269
Temperature Suffix
L (-40°C to 150°C)
Package Code
UF (die on foil)
Option
-1
1. Functional Diagram
Description
1.2 to 3 Bar Full Scale
VDD
Chopper
demodulator
Gain
calibration
Temperature
sensor
ADC
DIGITAL CORE
DAC
2. Description
The MLX90269 is an integrated
absolute pressure sensor (0 Bar
= vacuum) realized in CMOS
OUT technology with micromachining
options. It consists of an analog
signal chain that interacts with
the digital core and on-chip
temperature sensor in order to
provide uniform overall sensing
characteristics after calibration
and to cancel the temperature
related parameter drifts.
Diagnostics
The output is proportional to the
applied pressure with an adjustable slope and offset. It is ratiometric and goes rail-to-rail with a 3mA
source and sink capability. Different pressure ranges are available (from 1.2 to 7 Bar full scale ranges,
see above ordering information).
3901090269
Rev. 006
Page 1 of 9
Data Sheet
Mar/08




MLX90269 pdf, 반도체, 판매, 대치품
MLX90269
Absolute Integrated Pressure Sensor
5. General Description
This chip integrates a pressure sensor and the associated signal conditioning on the same die. The
supply voltage VDD directly supplies the pressure sensor.
A chopped instrumentation stage amplifies the differential output signal of the sensor. The gain of this
amplifier can be adjusted with 3 bits. The input stage is followed by a differential to single-ended
conversion. The reference voltage for this stage is generated by a 10 bit DAC and varies linearly with
temperature in order to perform the offset and offset drift compensation. A digital hardware multiplier
calculates this compensation. The temperature signal, serving as input for this multiplier, is generated
from the ADC of the output signal of the internal temperature sensor.
The chopped signal is demodulated with a switched capacitor stage. The buffered output serves as
reference for a 10 bit DAC to perform the span and span drift compensation. The DAC is controlled by the
digital part.
Finally the signal is given out by a class AB rail-to-rail amplifier capable of sourcing and sinking large
currents.
A 3-point temperature and 2-point pressure calibration is required (room temperature, a low temperature
and a high temperature), to achieve an error less than ±1% over the complete pressure and temperature
range (the output error is referred to the output span).
PTC (Programming Through Connector) protocol is used to perform calibration.
6. Unique Features
Diagnostic Limits
Diagnostic of broken sensor: The output will be forced to ground (or a very low level) when the sensor
membrane breaks.
Diagnostic of broken wires: The output will be forced to ground (or a very low level) when the supply wire
breaks, even when a pull-up is still connected to the output pin.
The output will be forced to the supply voltage (or a very high level) when the ground wire breaks, even
when a pull-down is still connected to the output pin.
Output Protection
The output is protected against short-circuits at either battery terminals. The output can handle voltages
between -0.5V and 16V (independent of supply voltage).
Memlock Function
The memory consists of ZAP cells. When all calibration parameters are programmed, the chip can be
locked. This to avoid unwanted data to be written into the memory cells.
Once the chip is locked in a normal application, it is not possible to unlock.
Clamping Levels
The user can enable the clamping of the output to ensure that the output can not enter the fault band in
normal application.
3901090269
Rev. 006
Page 4 of 9
Data Sheet
Mar/08

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MLX90269 전자부품, 판매, 대치품
MLX90269
Absolute Integrated Pressure Sensor
9. Die dimension and pad coordinates
Available upon request.
10. Calibration and Programming Procedure
Programming in Temporary Memory
The programming is done through the connector: only the application pins (supply, ground and output)
need to be used. The programming can be enabled by forcing the supply high enough (VCC_T). Through
the OUT pin one can input the data. The data is Pulse Width Modulated.
At the end of the programming, keep OUT high until VCC has reached its normal level (VCC_N).
Thereafter disconnect OUT. The time in between should be less than 100us.
Zapping of the Permanent Memory
Only 1 bit can be zapped at a time. First program 1 bit to ‘1’. A higher supply (VCC_Z) is needed to be
able to zap the bit. The zapping is done when OUT is high (OUT_Z).
A high current will flow during zapping. It is recommended to limit this current to 200mA.
The memlock-bit should be zapped as last bit, as this disables programming function.
3901090269
Rev. 006
Page 7 of 9
Data Sheet
Mar/08

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MLX90269

Absolute Integrated Pressure Sensor

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