GENERAL DEscriptION

The SGM821 is an ultra-low power and programmable watchdog timer designed for system wake-up in duty-cycled and battery-powered applications.

The SGM821 with programmable interrupt timer consumes only 35nA (TYP) system current. Accordingly, the system can be placed in sleeping mode, consuming less power, and only returning to active mode when the device is interrupted. The SGM821 is ideal for wireless sensor applications or other applications with smaller batteries compared to the μC that typically costs micro-amps of total system current. The watchdog timer of the SGM821 can be programmed by an external resistor of 500Ω to 180kΩ. And it provides a corresponding time interval from 100ms to 8200s (TYP).

The SGM821 is available in Green SOT-23-6 and TDFN-2×2-6AL packages. It operates over a junction temperature range of -40℃ to +105℃.

PIN CONFIGURATIONS

FEATURES

• Supply Voltage Range: 1.8V to 5.5V

• Low Current Consumption: 35nA (TYP)

• Programmable Watchdog Time: 100ms to 8200s (TYP)

• Manual Reset Input

• Available in Green SOT-23-6 and TDFN-2×2-6AL Packages

APPLICATIONS

Low Power Systems

IoT

Tamper Detectors

Smart Home Controllers

Wireless Sensors