JAJSD46B January 2017 – September 2021 TPS3850-Q1
PRODUCTION DATA
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The CWD pin provides the user the functionality of both high-precision, factory-programmed watchdog timing options and user-programmable watchdog timing. The TPS3850-Q1 features three options for setting the watchdog window: connecting a capacitor to the CWD pin, connecting a pullup resistor to VDD, and leaving the CWD pin unconnected. The configuration of the CWD pin is evaluated by the device every time VSENSE enters the valid window (VIT+(UV) < VSENSE < VIT-(OV)). 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 pullup resistor, then a 10-kΩ resistor is required.