Watchdog circuit composed of 89C51 single chip microcomputer + X25045

Single chip microcomputer STM32L151CCU6

1206RGB (single)

0201 package SLP0603 ESD electrostatic diode 5V one-way ESD

One-piece inductor

Using the watchdog circuit consisting of 89C51 MCU and X25045, the X25045 hardware connection diagram is shown in Figure 1. The X25045 chip contains a watchdog timer that allows the system to monitor the system's monitoring time. If there is no bus activity during the preset time of the watchdog timer, the X25045 will output a high level signal from RESET, and output a positive pulse through the differential circuits C2 and R3 to reset the CPU. In the circuit of Figure 1, there are three reset signals of the CPU: power-on reset (C1, R2), manual reset (S, R1, R2) and Watchdog reset (C2, R3), which are added to the RESET terminal through OR gate synthesis. The time constants of C2 and R3 do not have to be too large, and there are hundreds of microseconds, because the oscillator of the CPU is already working.

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