●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
