ZHCSIK0A July 2018 – October 2021 TPS3430
PRODUCTION DATA
The CRST pin provides the user the functionality of both high-precision, factory-programmed watchdog reset delay timing options and user-programmable watchdog reset delay timing. The CRST pin can be pulled up to VDD through a resistor, have an external capacitor to ground, or can be left unconnected. The configuration of the CRST pin is re-evaluated by the device every time the voltage on VDD comes up. The pin evaluation is controlled by an internal state machine that determines which option is connected to the CRST pin. The sequence of events takes 381 μs (tINIT) to determine if the CRST pin is left unconnected, pulled up through a resistor, or connected to a capacitor. If the CRST pin is being pulled up to VDD, then a
10-kΩ pull-up resistor is required.