Dallas Semiconductor Corp. has introduced a single-chip, multi-supply system monitor designed to simplify voltage-control issues in complex power systems.
The DS1831 multi-supply micromonitor can track four system voltages simultaneously while providing 3.3-V, 5-V, and master manual-reset inputs. An alternative version, the DS1831A, substitutes a watchdog function for one of the voltage monitors or master manual-reset inputs, enabling users to monitor three system voltages and processor operation.
The devices will allow customers to customize control over individual power supplies in multi-voltage systems while reducing component count and simplifying design, said Jerry Miller, product manager at the Dallas-based company.
"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," Miller said.
"These capabilities are also valuable in any system having multiple power supplies to assure consistent power-on conditions. It's especially valuable in systems such as telecommunication base-station towers, RAID boxes, and communication hubs and routers," he said.
The DS1831 is a member of Dallas Semiconductor's CPU supervisor family and monitors system power supplies for out-of-tolerance voltages. When an undersupply condition occurs, the supervisor warns the system processor by initiating a reset, providing for orderly system start-up and shutdown.
The device monitors 5- and 3.3-V systems, and supports two additional, user-defined voltages by means of two reference comparators. The DS1831 is available in 16-pin DIP and SOIC packages, and is $2.85 in quantities of 1,000.