1 Features
• Factory-programmed precision watchdog timers:
– ±2.5% Accurate watchdog timeout (WDT)
typical at 25°C
• Watchdog disable feature
• User-programmable watchdog timeout
• Input voltage range: VDD = 1.8 V to 6.5 V
• Low quiescent current: IDD = 10 μA (typical)
• Active-low open-drain output
• Enable input (EN) and enable output (ENOUT)
• Available in a small 3-mm × 3-mm, 8-pin VSON
package
• Junction operating temperature range:
–40°C to +125°C

2 Applications
• Cellular module asset tracker
• Energy storage power conversion system (PCS)
• Electricity meter
• Motion detector (PIR, uWave, etc.)
• IP network camera
• Surgical equipment

3 Description
The TPS3431 is a standard programmable watchdog
timer with an enable feature for a wide variety of
applications. The watchdog timeout features a 15%
accuracy, high-precision timing (–40°C to +125°C)
and 2.5% typical at 25°C. The watchdog timeout can
be programmed either by an external capacitor, or
by factory-programmed default delay settings. The
watchdog can be disabled via the Enable pin or the
SET logic pins to avoid undesired watchdog timeouts
during the development process.
The TPS3431 is available in a small 3.00-mm ×
3.00-mm, 8-pin VSON package.