ADM6384

Rev. 0 | Page 9 of 12

CIRCUIT DESCRIPTION

1V

0V

0V

RESET

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.

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

RESET OUTPUT

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

The ADM6384 features an active-low push-pull reset output.

to 1 V.

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

threshold (V

MR input, and fast, negative-going

transients of up to 100 ns (typ) are ignored. A 0.1 μF capacitor

between

TH

) or when MR is driven low. Reset remains

asserted for the duration of the reset active timeout period

(t

MR and ground provides additional noise immunity.

RP

transitions from low to high. Figure 12 illustrates the behavior

of the reset outputs.