IMP18 1 1
Application Information
Operation – Power Monitor
The IMP1811 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 V
CC
voltage is detected, the 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
F
V
CC
V
CCTP
(MAX)
V
CCTP
V
CCTP
(MIN)
t
RPD
RESET
t
R
V
CCTP
(MAX)
V
CCTP
(MIN)
V
CCTP
V
OL
1811_08.eps
V
CC
t
RPU
V
OH
RESET
1811_07.eps
Figure 2. Timing Diagram: Power-Down
Figure 1. Timing Diagram: Power-Up
4
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©
1999 IMP, Inc.
A1PROS [ A1 PROS CO., LTD. ]
