EM6323 Datasheet, PDF(1/10 Page) EM Microelectronic - MARIN SA – Reset Circuit with Manual Reset and Watchdog

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EM6323 Datasheet, PDF (1/10 Pages) EM Microelectronic - MARIN SA – Reset Circuit with Manual Reset and Watchdog

EM MICROELECTRONIC - MARIN SA

EM6323/24

Reset Circuit with Manual Reset and Watchdog

Description

The EM6323/24 are low power, high precision reset ICs

featuring a manual reset and a watchdog inputs. They have

different threshold voltages and several timeout reset periods

(tPOR) and watchdog timeout periods (tWD) for maximum

flexibility in the application. EM6323 has a manual reset ( MR

with internal pull-up) and a watchdog input pins. EM6324 has

only a watchdog input pin (WDI). The watchdog function can

be disabled by driving WDI with a three-state driver or by

leaving WDI unconnected. This is useful when the MCU is in

sleep mode.

Small SOT23-5L package as well as ultra-low supply current

of 3.8ÂµA make the EM6323 and the EM6324 an ideal choice

for portable and battery-operated devices.

Typical Application

VDD

GND

VDD

RESET

EM632x

WDI

GND

VDD

RESET

MPU, DSP

I/O

GND

* REXT for open-drain version only

Fig. 1

Block Diagram

VDD

Oscillator

GND

WDI

Voltage

Reference

Filter

Reset

Logic

+ Timer

RESET

Transition

Detector

Watchdog Logic

+ Timer

Fig. 2

Features

! Ultra-low supply current of 3.8ÂµA (VDD=3.3V)

! Operating temperature range: -40Â°C to +125Â°C

! Â±1.5% reset threshold accuracy

! 11 reset threshold voltages VTH: 4.63V, 4.4V, 3.08V,

2.93V, 2.63V, 2.2V, 1.8V, 1.66V, 1.57V, 1.38V, 1.31V

! 200ms reset timeout period (1.6ms, 25ms, 1600ms on

request)

! 1.6s watchdog timeout period (6.2ms, 102ms, 25.6s on

request)

! 3 reset output options:

Active-low RESET push-pull

Active-low RESET open-drain

Active-high RESET push-pull

! Detection of microcontroller in sleep mode

Applications

! Workstations

! Point of sales (POS)

! Personal computers

! Routers, hubs and switches

! Handheld GPS

! Vending machines and ATM

! Automotive systems

Pin Configuration

EM6323

(manual reset,

watchdog)

RESET 1

GND 2

5 VDD

MR 3

4 WDI

SOT23-5 top view

EM6324 (watchdog)

RESET 1

push-pull/open-drain

GND 2

5 VDD

RESET 3

push-pull

4 WDI

SOT23-5 top view

Fig. 3

Pin Description

SOT23-5L

Name

EM6323 EM6324

RESET

GND

RESET

WDI

VDD

Function

Active-low RESET output (push-pull or open-drain)

Ground

Manual Reset input with an internal pull-up 30kâ¦ resistor. Reset remains active as long as MR is low

and for tPOR after returns high. MR can be driven with a CMOS output or shorted to ground with a switch

Active-high RESET output (push-pull)

Watchdog input. WDI must be driven with a CMOS output. If the microcontroller I/O is put in a high

impedance condition, the circuit will detect this condition as a microcontroller in sleep mode and prevent

its watchdog from timing out

Supply Voltage (5.5V max.)

03/06 - rev.H

www.emmicroelectronic.com

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