SBVS366A July 2018 – October 2021 TPS3430
PRODUCTION DATA
The CWD pin provides the user the functionality of both high-precision, factory-programmed watchdog timeout options and user-programmable watchdog timeout. The TPS3430 features three options for setting the watchdog window: connecting a capacitor to the CWD pin, connecting CWD to a pull-up resistor to VDD, and leaving the CWD pin unconnected. The configuration of the CWD pin is evaluated by the device every time the voltage on VDD rises above VDD (min). The pin evaluation is controlled by an internal state machine that determines which option is connected to the CWD pin. The sequence of events takes 381 μs (tINIT) to determine if the CWD pin is left unconnected, pulled up through a resistor, or connected to a capacitor. If the CWD pin is being pulled up to VDD using a pull-up resistor, then a 10-kΩ resistor is required.