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the independent oscillator divider circuit of watchdog delic

2016-08-11 07:39  
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the independent oscillator divider circuit of watchdog delicated chip TPS3823
①Because the clock of the watchdog is dependent,the counting clock and the system belong to the same frequency division link.The watchdog won't operate effectively when the system have some problems.②The clock can use software to set up.When the setting up is failed,the clock may fail as well. Without clock,watchdog can't work well.③Some watchdog need software to set up and start.So when the start fails and initialization unactivated,CPU might jump to random code.It may stop the watchdog.Theoretically,the design has the unreasonable part.Based on the analysis above,we adopt off chip watchdog using dedicated chip TPS3823.The experimental circuit is seen as below: