The IMMO (Immobilizer, anti-theft control system) function is a backup emergency mode start function in the PEPS system. When the battery on the smart key is exhausted and the lock cannot be unlocked through the active RKE/PKE, the IMMO function uses the password of the chip in the key to match the password in the starter electric door to control the engine to start, in order to achieve the purpose of anti-theft.
The IMMO function is mainly enabled in an emergency state. When the smart key runs out of power or the PKE/PKE operation fails, the smart key is placed close to the base station antenna (the distance is short, about 3 cm), and the ID of the key is obtained to the base station through coil induction. The base station verifies and allows the engine to be unlocked.
Figure 1 Block diagram of IMMO functional system
Among them, S32K116 is the main MCU, PJF7992 is the low-frequency antenna driver, NCF29A1 is the label key
Second, the operation instructions
1. Hardware connection
① Connect the S32K116 main control board and the PJF7992 low-frequency driver board via DuPont cable
② Connect the PJF7992 low frequency driver board and antenna
③ Power up the main control board through the 12V adapter
Figure 2 Hardware connection
2. Software operation (the development environment used is S32DS)
②wooow up low-frequency communication equipment
③ Burn the code to the main control MCU S32K116
Figure 3 Code operation
3. Test
① When the key is close to the base station (within 3 cm), the ID of the key can be printed
Figure 4 The key is close to the base station (within 3 cm)
② When the key is away from the base station (more than 3 cm), “IMMO DEMO failure!" will be printed on the OLED. ”
Figure 5 The key is away from the base station (more than 3 cm)
The above is based on the implementation of the IMMO function of S32K116+PJF7992 + NCF29A1. If you want to know more about the relevant information, please leave a comment or private message.
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