Precision voltage supervisor with programmable window watchdog timer

The TPS3850 from Texas Instruments combines a precision voltage supervisor with a programmable window watchdog timer. The device window comparator achieves 0.8% accuracy (–40C to +125C) for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds. It also includes accurate hysteresis on both thresholds, making the device ideal for use with tight tolerance systems. The supervisor RESET delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The factory-programmed RESET delay features a 15% accuracy, high-precision delay timing. The device includes a programmable window watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The window watchdog timeouts can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process. The device is available in a small 3mm × 3mm, 10-pin VSON package.