EM MICROELECTRONIC - MARIN SA R A6130-A6250 5V LDO with Windowed Watchdog Description Features 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. 5V-100mA LDO Voltage Regulator (250mA for A6250) 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 P that supervises the master one, to prevent endless loops, to re-initialize the system in case of bad execution of software). It combines voltage regulator and supervisory functions in a single chip to reduce drastically PCB size and mounting costs Windowed watchdog function Voltage monitoring and reset timeout period at start-up Separate output enable for peripheral: the circuit waits 3 acknowledgements from P 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% accuracy Adjustable watchdog timer (TWD = 10ms to 1sec, accuracy 10%) using one external resistor Adjustable reset timeout period TPOR using one external resistor Windowed Watchdog Sophisticated watchdog timer that detects when the processor is running outside an expected window of operation Window: Opened Opened Closed Closed Typical Application Opened Closed Unregulated VDD (up to +26V) LDO Voltage Regulator Closed VDD TCL incorrect - too fast 5V regulated VDD RES will go active: TCL incorrect - too slow VIN RES RESET (open-drain) RES will NOT go active: 3 correct TCL service VDD VDD To adjust voltage threshold RES will go active: V6130 V6150 V6155 TCL correct A6130, A6150 A6155, A6250 MPU,MCU TCL I/O EN EN R To adjust TWD and TPOR EN goes active: GND Peripheral, Actuator GND t GND EM Family of LDO Voltage Regulator with Windowed Watchdog 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 +85C SO8 A6150 5V / 380mV@100mA 2.3 to 26V 1.52V 3% Push-pull -40 to +85C/125C SO8 A6155 5V / 380mV@100mA 2.3 to 26V 1.275V 2% Push-pull -40 to +85C SO8 A6250 5V / 260mV@250mA 2.3 to 40V 1.52V 3% Push-pull -40 to +125C PSOP2-16 Copyright (c) 2004, EM Microelectronic-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