FIRST SINGLE-CHIP, MULTI-SUPPLY SYSTEM MONITOR WITH MANUAL RESETS
DALLAS, TX-April 18, 2000-Dallas Semiconductor today announced the DS1831 Multi-Supply MicroMonitor, the first single-chip monitor that can track four system voltages simultaneously while providing 3.3V, 5V, and master manual reset inputs. An alternate version of the DS1831, the DS1831A, substitutes a watchdog function for one of the voltage monitors and master manual reset input, thus monitoring three system voltages and processor operation. These capabilities allow engineers to customize control over individual power supplies in multi-voltage systems while reducing component count, simplifying design and saving space.
 Jerry Miller, Dallas' product manager for the DS1831, said, "Targeted control over individual power supplies in complex systems simplifies 'hot swapping,' which means you can achieve more consistent control over power up conditions during the replacement of hot swappable cards. These capabilities are also valuable in any system having multiple power supplies to assure consistent power-on conditions. It is especially valuable in systems such as telecommunication base station towers, RAID boxes, and communications hubs and routers."
The DS1831 is a member of Dallas' CPU supervisor family. All CPU supervisors monitor system power supplies for out-of-tolerance voltages. When an under-supply condition occurs, the supervisor warns the system processor by initiating a reset, providing for orderly system start-up and shutdown.
The DS1831 monitors 5V, 3.3V (or 3V) system voltages and two additional, user-configured voltages by means of two reference comparators. Multiple options for system control are provided by three manual reset inputs: 5V, 3.3V and a master reset input. Three different voltage tolerances and three different reset delay times can be selected based on the condition on two control inputs for each reset.
To suit different application needs, the DS1831A substitutes a watchdog timer for one reference comparator and the master reset input. A watchdog monitors processor activity and initiates a processor reset after no activity has been detected over a user-specified interval, indicating an out-of-control or stalled processor. Designers can benefit by condensing the functionality of multiple chips into a single device.
The DS1831 operates in the -40°C to +85°C temperature range and is available in 16-pin DIP and 16-pin SOIC packages. Applications for this monitor are in systems with multiple voltage inputs, such as T1/E1 servers, wireless signal control and data communications hubs. The DS1831 Multi-Supply MicroMonitor is in production now and is available from stock at a cost of $2.85 in quantities of 1,000.
Dallas Semiconductor manufactures specialty semiconductors focused in three areas: Communications, 1-Wire® and Network Computing, and Mixed Signal. The Company combines proprietary fab and circuit technologies to create innovative products that are sold to over 15,000 customers worldwide. Applications include broadband telecommunications, wireless handsets, cellular base stations, secure Internet communications, networking, servers, data storage and a wide variety of industrial equipment.
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