R
A6130-A6250
Copyright © 2004, EM Mic roelectronic-Marin SA
Subject to change without notice
Rev. C, 08/04
Phone: +41.32.755-5111, Fax: +41.32.755-5403
www.emmicroelectronic.com
info@emmicroelectronic.com
5V LDO with Windowed Watchdo g
Description
The A6130, A6150, A6155 and A6250 are microprocessor
supervisory circuits including voltage monitoring, reset
timeout period, windowed watchdog functions and a 5V
low-dropout voltage regulator.
The watchdog timer, the reset timeout period and the
voltage threshold are externally set by resistors to provide
more flexibility.
Benefits
Detect events that are expected within a time interval
that has both a minimum and a maximum
Wherever software security is requested (e.g. to avoid
a second µP that supervises the master one, to
prevent endless loops, to re-initialize the system in
case of bad execution of softw are).
It combines voltage regulator and supervisory
functions in a single chip to reduce drastically PCB
size and mounting costs
Windowed Watchdog
Sophisticated watchdog timer that detects when the
processor is running outside an expected window of
operation
Closed Closed Closed Closed
Opened Opened Opened
TCL incorrect - too fast RES will go active:
TCL incorrect - too slow RES will go active:
t
TCL correct RES will NOT go active:
3 correct TCL service EN goes active:
Window:
Features
5V-100mA LDO Voltage Regulator (250mA for A6250)
Windowed watchdog function
Voltage monitoring and reset timeout period at start-up
Separate output enable for peripheral: the circuit waits
3 acknowledgements from µP to ensure full working
system before activation of peripheral (e.g. motor
drivers, actuators)
Sleep mode function (A6155): internal oscillator
generates TWD of 1 second
Power package: thermal resistor decreased by 4 (A6250)
High Flexibility and Accuracy
Adjustable reset threshold voltage with ±2% accura cy
Adjustable watchdog timer (TWD = 10ms to 1sec,
accuracy ±10%) using one external resistor
Adjustable reset timeout period TPOR using one
external resistor
Typical Application
VDD
GND
RES
R
V6130
V6150
V6155
VDD
I/O
RESET
MPU,MCU
GND
TCL
EN EN
VIN
Peripheral,
Actuator
To adjust
voltage
threshold
To adjust
TWD and TPOR GND
LDO
Voltage
Regulator
5V regulated VDD
A6130, A6150
A6155, A6250
VDD
Unregulated VDD
(up to +26V)
(open-drain)
EM Family of LDO Voltage Regulator with Windowed Watc hdog
Part
Number LDO Voltage Regulator
(VOUT / VDROPOUT@IOUT) Input
Voltage VIN Reset
Threshold Output EN Sleep
mode Temperature Range Packages
A6130 5V / 380mV@100mA 2.3 to 26V 1.17V ± 2.2% Push-pull -40° to +85°C SO8
A6150 5V / 380mV@100mA 2.3 to 26V 1.52V ± 3% Push-pull -40° to +85°C/125°C SO8
A6155 5V / 380mV@100mA 2.3 to 26V 1.275V ± 2% Push-pull ♦ -40° to +85°C SO8
A6250 5V / 260mV@250mA 2.3 to 40V 1.52V ± 3% Push-pull -40° to +125°C PSOP2-16
EM MICROELECTRONIC - MARIN SA
