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ASM1232LP Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM1232LP Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
1 / 10 page ASM1232LP/LPS Alliance Semiconductor 2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com Notice: The information in this document is subject to change without notice January 2005 rev 1.5 5V µP Power Supply Monitor and Reset Circuit General Description The ASM1232LP/LPS is a fully integrated microprocessor supervisor. It can halt and restart a “hung-up” microprocessor, restart a microprocessor after a power failure. It has a watchdog timer and external reset override. A precision temperature-compensated reference and comparator circuits monitor the 5V, VCC input voltage status. During power-up or when the VCC power supply falls outside selectable tolerance limits, both RESET and RESET become active. When VCC rises above the threshold voltage, the reset signals remain active for an additional 250ms minimum, allowing the power supply and system microprocessor to stabilize. The trip point tolerance signal, TOL, selects the trip level tolerance to be either 5% or 10%. Each device has both a push-pull, active HIGH reset output and an open drain active LOW reset output. A debounced manual reset input, PBRST, activates the reset outputs for a minimum period of 250ms. There is a watchdog timer to stop and restart a microprocessor that is “hung-up”. The watchdog timeouts periods are selectable: 150ms, 610ms and 1200ms. If the ST input is not strobed LOW before the time-out period expires, a reset is generated. Devices are available in 8-pin DIP, 16-pin SO and compact 8- pin MicroSO packages. Key Features • 5V supply monitor • Selectable watchdog period • Debounce manual push-button reset input • Precision temperature-compensated voltage reference and comparator. • Power-up, power-down and brown out detection • 250ms minimum reset time • Active LOW open drain reset output and active HIGH push-pull output • Selectable trip point tolerance: 5% or 10% • Low-cost surface mount packages: 8-pin/16-pin SO, 8-pin DIP and 8-pin Micro SO packages • Wide operating temperature -40°C to +85°C (N suffixed devices) Applications • Microprocessor Systems • Computers • Controllers • Portable Equipment • Intelligent Instuments • Automotive Systems Typical Operating Circuit Block Diagram ASM1232LP/LPS ST RESET GND TD TOL I/O RESET µP 10k Ω +5V Tolerance Selection Reference Push Button Voltage Sense Watchdog Transition Reset & Debounce Comparators Detector Watchdog Timer + - RESET RESET PBRST ST TD TOL VCC GND 40k Ω VCC ASM1232LP/LPS |
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