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Dual-voltage ICs suit portable applications

Posted: 16 Jan 2006     Print Version  Bookmark and Share

Keywords:AS1910-15  supervisory circuits  microprocessor  austriamicrosystems 

Dual-voltage microprocessor supervisory ICs

Austriamicrosystems has introduced its AS1910-15 family of dual-voltage microprocessor supervisory circuits with manual reset and watchdog functions. Designed for portable and battery-powered systems, and all dual-supply applications, these ICs offer a power consumption of 5.8µA (typ), and support a wide temperature range of -40°C to 125°C; which makes the devices suitable for industrial applications.

The AS1913, AS1914 and AS1915 feature factory-trimmed thresholds to monitor a primary voltage between 1.8V and 3.6V, and a secondary voltage between 0.9V and 2.5V. For the AS1910, AS1911 and AS1912, the secondary monitored voltage can be user-adjusted via an external resistor divider down to 0.6V.

According to Walter Moshammer, marketing director standard linear at austriamicro, the AS1910-15 family of supervisory ICs has been designed to generate a reset when one of the two monitored supply voltages falls below a factory-trimmed threshold and to maintain the reset for a minimum timeout period when both supplies are above their reset thresholds. "The IC's design safeguards that they are in the correct state for VCC down to 1V, making them ideal for low-voltage systems with strict monitoring requirements," said Moshammer.

This family of ICs includes a manual-reset input for systems that never fully power the microprocessor down. Additionally, these devices feature a watchdog with a timeout period of 1.5s which means that if no clock is applied, a reset is generated.

Moshammer added that the AS1910-15 family is suitable for portable and battery-powered systems, embedded controllers and communication systems. This includes dual-supply applications such as computers, intelligent instruments, critical processor and controller power monitoring. "They are particularly well suited for use in microprocessor-based systems where the core processor typically has a 1.8V supply or lower while the periphery is powered with 3V or 3.3V. In such systems both voltages must be monitored simultaneously," Moshammer added.

The supervisory chips are available in SOT23-6 packaging and with the following reset output types: active-low push-pull (AS1910 and AS1913), active-high push-pull (AS1911 and AS1914) and active-low open-drain (AS1912 and AS1915).




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