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Notice: The information in this document is subject to change without notice

Low Power 5V µP Reset

ASM1812

rev 1.4

February 2005

Application Information

Operation - Power Monitor

The ASM1812 detects out-of-tolerance power supply

conditions. It resets a processor during power-up, power-

down and issues a reset to the system processor when the

monitored power supply voltage is below the reset threshold.

RESET signal is asserted. On power-up, RESET is kept

active (HIGH) for approximately 150ms after the power

supply voltage has reached the selected tolerance. This

allows the power supply and microprocessor to stabilize

before RESET is released.

Microprocessor

RESET

RESET

ASM1812

Figure 1: Typical Application

RESET

Figure 2: Timing Diagram: Power-Up

RESET

Figure 3: Timing Diagram: Power-Down