MC33690 Standalone Tag Reader Circuit

The standalone tag reader circuit (STARC) is an integrated circuit dedicated to the automotive immobilizer applications. It combines the antenna drivers and demodulator necessary to interface with a transponder. A low dropout voltage regulator and a physical interface fully compatible with the ISO 9141 norm are also available. The STARC is fabricated with the SMARTMOSTM3.5 technology. This process is a double layer metal 1.4µm 45V technology, combining CMOS and bipolar devices.

• Contactless 125 kHz tag reader module:

– Self synchronous sample and hold demodulator

– Amplitude or phase modulation detection

– High sensitivity

– Fast read after write demodulator settling time

– Low resistance and high current antenna drivers, 2W @ 150mA (typ.)

– Bidirectionnal data transmission

– Multi-tag, multi-scheme operation

• Low dropout voltage regulator:

– Wide input supply voltage range from 5.5V up to 40V

– Output current capability up to 150mA DC with an external power transistor

– 5V output voltage with a ±5 accuracy

– Low voltage reset function

– Low current consumption in standby mode:

– 300µA (typ.)

• ISO 9141 transmitter and receiver module:

– Input voltage thresholds ratiometric to the supply voltage

– Current limitation

– Output slew rate control

– No external protection device required