EM6324LYSP5B2.2 datasheet(8/10 Pages) EMMICRO

Part #	EM6324LYSP5B2.2

Description	Reset Circuit with Manual Reset and Watchdog

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Manufacturer	EMMICRO [EM Microelectronic - MARIN SA]

Direct Link	http://www.emmicroelectronic.com

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8 / 10 page

EM6323/24

Copyright

03/06 - rev.H

8

www.emmicroelectronic.com

Functional Description

WDI

RESET

t > t

WD

t < t

WD

V

DD

t

POR

High Impedance

t

POR

MR

t

POR

Fig. 14

Reset Outputs

A microprocessor (µP) reset input starts the µP in a

known state. The EM6323/24 µP supervisory circuits

assert a reset to prevent code-execution errors during

power-up, power-down, and brownout conditions. RESET

is guaranteed to be a logic low for VDD down to 0.9V.

Once VDD exceeds the reset threshold, an internal timer

keeps RESET low for the specified reset timeout period

(tPOR); after this interval, RESET returns high.

If a brownout condition occurs (VDD dips below the reset

threshold), RESET goes low. Each time RESET is

asserted it stays low for the reset timeout period. Any

time VDD goes below the reset threshold the internal

timer restarts. RESET is the inverse of RESET.

Manual Reset Input (EM6323 only)

A logic low on MR asserts a reset. Reset remains

asserted while MR is low, and for tPOR (200ms nominal for

EM6323 C-G-L-Q) after it returns high. MR has an

internal 30k

Ω pull-up resistor, so it can be left open if

unused. This input can be driven with CMOS logic levels

or with open-drain outputs. Connect a normally open

momentary switch from MR to VSS to create a manual-

reset function; debounce circuitry is integrated. If MR is

driven from long cable or the device is used in a noisy

environment, connect a 0.1

µF capacitor from MR to VSS

to provide additional noise immunity (stronger external

additional pull-up resistor can also be added).

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EM6324LYSP5B2.2 Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA

EM6324LYSP5B2.2 Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA

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