mlx90603 Melexis Company, mlx90603 Datasheet - Page 8

• Manufacturer Part Number: mlx90603
• Description: Tire Pressure Monitoring Sip Low-power Pressure Sensor
• Manufacturer: Melexis Company

6.2.1 EEPROM
The MLX90603 has 128 bytes of EEPROM on board. Half of this memory is reserved for internal operation
coefficients. The rest is available for application specific data like a sensor identification number.
6.2.2 RAM
RAM size is 256 bytes.
6.2.3 ROM/FLASH
The Program Memory size is 4K Word Instructions or 8 Kbytes.
A wide range of interrupt sources are available, each with their own interrupt vector address.
External interrupts include IRQ on digital IO’s or from the RFID interface.
Internal interrupts include a watchdog and 2 compare timers.
A bandgap is used to generate the internal voltage reference, independent of the battery voltage.
The output of the pressure, temperature and voltage sensor are differential signals that are multiplexed on
the input of the signal conditioning chain.
Linearization time varies depending on the sensor (see specification). During the ADC measurement, the
microcontroller is switched off to reduce power consumption and noise influence during a measurement
(see power consumption below).
6.4.1 Absolute Pressure sensor
The pressure sensor is a separate silicon MEMS (Micro Electro-Mechanical Structure) die based on piezo-
resistive wheatstone bridge. Under the sensitive pressure membrane a vacuum cavity serves as reference.
6.4.2 Temperature sensor
The temperature sensor is part of the MLX10111.
6.4.3 Voltage sensor
The battery or supply voltage sensor is part of the MLX10111.
3901090603 Rev.002
6.2 MEMORIES
6.3 Interrupts
6.4 Measurement functions
The actual measurement consists of the amplification of the analog value that then is converted to a
digital signal by an analogue to digital converter (ADC).
Next these ADC output values are linearized, removing the offset and adjusting the sensitivity using
the calibration constants that are stored in the EEPROM.
measured and programmed during the production test at Melexis.
Page 8 of 18
Tire Pressure Monitoring SiP
Low-Power Pressure Sensor
These calibration constants are
MLX90603
19 July 2007