February 2005
ASM1811
rev 1.4
Application Information
Operation - Power Monitor
tF
The ASM1811 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.
When an out-of-tolerance VCC voltage is detected, the
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
RESET signal is asserted. On power-up, RESET is kept
active (LOW) 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.
t
RESET
RPD
tR
V
OL
VCCTP (MAX)
Figure 2: Timing Diagram: Power-Down
VCCTP
VCCTP (MIN)
t
RPU
VCC
V
OH
RESET
Figure 1: Timing Diagram: Power-Up
3 of 9
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
PULSECORE [ PulseCore Semiconductor ]
