ADM6384(Rev0) 查看數據表（PDF） - Analog Devices
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ADM6384 Datasheet PDF : 12 Pages
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CIRCUIT DESCRIPTION
The ADM6384 provides microprocessor supply voltage
supervision by controlling the microprocessor’s reset input.
Code execution errors are avoided during power-up, power-
down, and brownout conditions by asserting a reset signal
when the supply voltage is below a preset threshold. In addition,
the ADM6384 allows supply voltage stabilization with a fixed
timeout before the reset deasserts after the supply voltage
rises above the threshold. If the user detects a problem with
the system’s operation, a manual reset input is available to reset
the microprocessor by means of an external push-button,
for example.
RESET OUTPUT
The ADM6384 features an active-low push-pull reset output.
The reset signal is guaranteed to be logic low for VCC down
to 1 V.
The reset output is asserted when VCC is below the reset
threshold (VTH) or when MR is driven low. Reset remains
asserted for the duration of the reset active timeout period
(tRP) after VCC rises above the reset threshold or after MR
transitions from low to high. Figure 12 illustrates the behavior
of the reset outputs.
ADM6384
VCC
VCC
1V
0V
VCC
RESET
0V
VTH
VTH
tRP
tRD
Figure 12. Reset Timing Diagram
MANUAL RESET INPUT
The ADM6384 features a manual reset input (MR) which, when
driven low, asserts the reset output. When MR transitions from
low to high, reset remains asserted for the duration of the reset
active timeout period before deasserting. The MR input has a
52 kΩ internal pull-up so that the input is always high when
unconnected. An external push-button switch can be connected
between MR and ground so that the user can generate a reset.
Debounce circuitry for this purpose is integrated on-chip. Noise
immunity is provided on the MR input, and fast, negative-going
transients of up to 100 ns (typ) are ignored. A 0.1 μF capacitor
between MR and ground provides additional noise immunity.
Rev. 0 | Page 9 of 12
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