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P2SC Signal Conditioning Chip family
A true world leader in RF identification technologies, Philips is spearheading the innovative use of this technology in Tire Pressure Monitoring Systems (TPMS). Designed for all remote sensing and signal conditioning applications, the P2SC family provides an extremely robust and accurate solution, which is also highly convenient, flexible and cost-effective.
Designed for tire pressure monitoring
Semiconductors
General information
The first member of the P2SC family is the PCH7970, a high performance device for signal conditioning and data framing in applications such as tire pressure monitoring systems.This will provide increased passenger and driver safety by constantly monitoring individual tire pressures directly, in line with recent legislation. Based on a low power, 8-bit micro RISC kernel (MRKII), the PCH7970 features a number of general purpose I/Os to control external circuitry and a high precision 12-bit (11-bit and sign) ADC to read the output voltage of a piezo-resistive bridge sensor.Two multiplexed sensors may be connected to the device with both the sensor and ADC operating ratiometrically. 128 bytes of on-chip EEPROM stores the calibration data for the Digital Sensor Signal Processing (DSSP) and correction characteristics are determined by the RISC controller and user's program.The device also incorporates 128 bytes RAM and 4 Kbyte E-ROM, enabling Flash-like programming of application code for development and low volume applications. Furthermore the device features 4kbyte ROM for device firmware and DSSP algorithm. A dedicated ROM version for high volume applications is available. The device is powered by an external, single-cell battery and offers programmable low battery detection.The lifetime of the battery can be extended by use of the power down mode, which minimizes the quiescent current, and a 3D-LF interface, which enables on demand wake-up. An independent interval timer provides a programmable, periodic wake-up from power down mode.
Features
* Highly integrated single-chip solution * Fully programmable, low-power RISC signal conditioning IC * Two multiplexed, high-precision sensor inputs with programmable sensor input gain * Smart power management with wake-up on demand from power down by port or 3D-LF interface * 32-bit unique ID * Digital Sensor Signal Processing * 12-bit ADC * On-chip temperature sensor and shutdown * Wide operating temperature range -40 to +125 C
RISC controller Benefits
* * * * * * * Greater flexibility in system development Reduced time-to-market, bill of materials and development costs Easy, software upgrade of system One receiver for Remote Keyless Entry and Tire Pressure Monitoring Auto-localization of wheels after car maintenance Long product / battery life (10 years or more) Sensor module identification The 8-bit RISC (MRKII) controller at the heart of the PCH7970 features a single level interrupt architecture and low power consumption, operating at 400 A and drawing currents of 30 A and 200 nA in idle and power down modes.The controller is optimized for serial data processing, with instruction execution times as fast as 0.5 s.Timing is governed by an on-chip, low tolerance RC oscillator with a programmable system clock capable of speeds up to 2 MHz.
P2SC Signal Conditioning Chip family
w w w. s e m i c o n d u c t o r s . p h i l i p s . c o m
P2SC: PCH7970 (737x, ROM)
PLL Ref. XTAL
UHF Down-Link
Pressure Sensor Signal Conditioning, P2SC+
E-ROM TIMER MODULATOR UHF PLL*
VOUT+ EXC+
LF INTERFACE Wake-Up Link (1D...3D)
ROM 8 BIT RISC RAM
VOUT--
INTERRUPT CONTROL
I/O ADC
PRESSURE SENSOR
EXC--
EEPROM
RC OSCILLATOR
TEMP SENSOR
Spare I/O (ext. WUP) MOTION SWITCH (optional)
POWER MANAGEMENT
Li 3V
* : subject to future integration
MSE083
Philips Semiconductors
Philips Semiconductors is a worldwide company with over 100 sales offices in more than 50 countries. For a complete up-to-date list of our sales offices please e-mail sales.addresses@www.semiconductors.philips.com. A complete list will be sent to you automatically.You can also visit our website http://www.semiconductors.philips.com/sales. (c) Koninklijke Philips Electronics N.V. 2002 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Date of release: October 2002 Document order number: 9397 750 10316 Published in The Netherlands

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