PCJ7991AT/1081,118

Readers Advanced Basestation IC Philips Semiconductors’ highly integrated and powerful Advanced Basestation IC (ABIC) is ideally suited for vehicle immobilization applications. This device incorporates all necessary functions to read and write to transponders, and employs a unique AM/PM demodulation technique (AST, Adaptive Sampling Time) that extends the system’s operating range. Optimized to operate with Philips Semiconductors’ PCF79xx transponder family, the ABIC can be used in combination with commonly available transponders that employ ASK modulation. ASK modulation and reception characteristics are widely programmable for powerful system adaptation. The ABIC is also ideal for ‘intelligent antenna’ as well as ‘active antenna’ applications. The carrier frequency can be derived from an on-chip oscillator or external clock source, and a wide range of clock frequencies can be applied using the programmable on-chip clock divider circuitry. The device enables system diagnostics via antenna failure detection features. Communication with the device and the transponder is provided via a serial microcontroller interface. Employing CMOS technology, the device features low power operation and supports idle and power down modes. Product overview Philips Semiconductors Features PCF7991AT PCJ7991AT Extended system operating range due to powerful AM/PM demodulation techniques Yes Yes Ideally suited for ‘intelligent antenna’ and ‘active antenna’ architectures Yes Yes High antenna drive capabilities CW: 200 mAp CW: 200 mAp Low antenna driver output resistance 3.5 Ohm 3.5 Ohm Excellent receiver sensitivity 2 mVpp 2 mVpp Programmable clock divider, modulator, receiver gain and filter characteristics Yes Yes Fast ‘read after write’ receiver settling characteristics Yes Yes On-chip receive EMI filter Yes Yes Antenna failure mode detection Yes Yes Few external components Yes Yes Operating supply voltage Yes Yes Power down mode 7 µA @ 5.5 V 7 µA @ 5.5 V Package SO14 SO14 Extended temperature range –40 to +85 °C –40 to +105 °C Philips Semiconductors