mlx90603 Melexis Company, mlx90603 Datasheet - Page 9

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

6.4.4 External sensor
Pin BP2 can be used to measure an extra analog sensor.
The general I/O pins IO2 and IO4 can be configured as a differential input of a 3
An external interface communication can be implemented in software, using any of the digital IO’s: any
serial RF/LF/SPI protocol can be programmed.
6.5.1 RF transmission
The communication protocol for RF transmission can be programmed in software, with preamble and CRC.
Normally the baud rate is generated in software, using the High Frequency Clock of the microcontroller
(HFO).
compensation. As alternative, the stable external clock from the RF transmitter IC can be used for accurate
baud rate generation.
The MLX90603 can be used with most commercially available transmitters and transceivers. For instance
in combination with the Melexis TH720x range of RF transmitters an ASK or FSK data-stream can be
generated.
6.5.2 RFID or LF interface
The RFID interface operates at 125kHz. This operating frequency is set by an external inductance and
capacitor. Two sensitivity levels are available:
Several hardwired features are integrated to minimize power consumption:
VLFO: The Very Low Frequency Oscillator generates a 2 KHz clock that is used for the low-power Sleep
LFO:
HFO:
3901090603 Rev.002
6.5 Communication interface
6.6 Power management
6.7 Oscillators
The Low Frequency Oscillator generates a 32 KHz clock that can be used for low-power DMA
The High Frequency Oscillator is the 1MHz micro-controller clock, instructions are executed based
A Strong Field Detector (SFD) is available in which the controller does not consume any current
from the battery. This can be used to wake up the IC in production test, and to maximize shelf life.
A Medium Field Detector (MFD), is available in which the controller is sleeping and woken-up by an
external 125KHz signal, e.g. to start a measurement and do a transmission on demand.
Multiple power consumption operating modes: shelf mode, sleep mode, idle mode, run mode
Optional 16bit CRC in hardware to reduce power consumption during communication
Optional DMA mode (direct memory access) for low power RAM access during communication
Mode: the sleep time can be programmed in steps of 250ms (= 0 to 64 seconds sleep time).
communication or to program short sleep periods
on this clock: 4 clocks per instruction, 4us per instruction
The temperature variation of the internal RC oscillator can be reduced by extra software
Page 9 of 18
Tire Pressure Monitoring SiP
Low-Power Pressure Sensor
rd
MLX90603
sensor.
19 July 2007