Standalone Tag Reader Circuit

STARC

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

• Contactless 125kHz tag reader module :

- Self synchronous sample & hold demodulator

- Amplitude or phase modulation detection

- High sensitivity

- Fast “read after write“ demodulator settling time

- Low resistance and high current antenna drivers : 2Ω @ 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

- Ouput slew rate control

- No external protection device required.