Typical automotive electronic circuit: key module circuit diagram
The key module chip adopts PCF7961 produced by NXP Company.
PCF7961 is a reduced instruction set (RISC) processor based on the low-power 8-bit MRKII architecture, which integrates the UHF transmitter and LF frequency transceiver chip. This kind of chip can complete radio frequency transmission and transponder low frequency communication authentication, and is suitable for remote control anti-theft devices of motor vehicles. It uses a fast mutual authentication algorithm, uses random numbers, keys and passwords, and has the characteristics of high sensitivity (long distance) and short authentication time (39 ms).
PCF7961 also provides a 32-bit identification code (ID) that has been cured at the factory. Figure 3 is the circuit schematic of the key module.
Figure 3 Key module circuit
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