RC reset circuit increases the discharge loop

Published:2011/5/16 7:39:00 Author:Christina | Keyword: discharge loop, RC reset circuit | From:SeekIC

You can solve the system instability which is caused by the power glitch by using the comparison circuit, and the power slow dropping can be reliably reset. Figure 4 is the example: when VCCx(R1/(R1+R2))=0.7V, Q1 closes to reset the system Q1. The amplification of Q1 also improves the load characteristics of the circuit, but the transition threshold voltage Vt is affected by the Vcc, this is the most prominentest weak point of this circuit, so you can use the zener diode to make the Vt will not affected by the Vcc. Figure 5: when Vcc is lower than Vt(Vz+0.7V), the circuit reset the system. Figure: RC reset circuit increases the discharge loop



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