U2270B

U2270B Read / Write Base Station IC Description IC for IDIC® *) read-write base stations The U2270B is a bipolar integrated circuit for read-write base stations in contactless identification and immobilizer systems. The IC incorporates the energy transfer circuit to supply the 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 signal into a microcontroller-compatible signal. The U2270B is well suitable to perform read operations with e5530-GT and TK5530-PP transponders and also performs read-write operations with TK5550-PP and TK5560-PP transponders. Features D D D D D D D D D 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 Applications D Car immobilizers D Animal identification D Access control D Process control D Further industrial applications Case: SO16 U2270B-FP Transponder / TAG Read / write base station Transp. IC e5530 e5550 e5560 RF– Field typ. 125 kHz Osc Carrier enable U2270B NF read channel Data output MCU Unlock System TK5530-PP e5530-GT TK5550-PP TK5560-PP Figure 1....