Carrier frequency fosc 100 KHz – 150 KHz Typical data rate up to 5 Kbaud at 125 KHz Suitable for Manchester and Bi-phase modulation Power supply from the car battery or from 5-V regulated voltage Optimized for car immobilizer applications Tuning capability Microcontroller-compatible interface Low power consumption in standby mode Power-supply output for microcontroller
The U2270B is?an IC for IDIC read/write base stationsin contactless identification and immo-bilizer systems. The IC incorporates the energy-transfer circuit to supplythe transponder. It consists of an on-chip power supply, an oscillator and a coil driver optimized for automotivespecific distances. It also includes all signal-processing circuits which are necessary to form the small input signalinto a microcontroller-compatible signal. The U2270B is well suited to perform read operationswith e5530-GT and TK5530-PP transponders and also performs read/write operations with TK5550-PP and TK5560-PP transponders.
