Power Electronics / Power Management


Quad-voltage microprocessor supervisory circuit

19 September 2007 Power Electronics / Power Management

austriamicrosystems has expanded its supervisory portfolio with the AS1923, a quad-voltage microprocessor supervisory IC. The AS1923 is designed to monitor up to four system supply voltages without the need for external components, and asserts a single reset if any of the monitored supply voltages drops below its reset threshold.

A variety of different factory-trimmed voltage threshold options are available for monitoring +5,0, +3,3, +3,0, +2,5, +1,8, and -5,0 V supplies with -5% and/or -10% tolerances. The AS1923 is also available with one or two user-adjustable threshold options (via external resistor-divider network) if non-standard voltage thresholds are required. The internally trimmed thresholds and the two reset output options minimise the need for external components, while the open-drain output can be overdriven by external voltages ranging from 0 V to +5,5 V to provide easy interfacing to other devices.

The AS1923 features an active-low reset output that is asserted when any of the 4 monitored voltages are below their respective reset threshold. The reset output is available as open-drain (AS1923A) or 10 μA Current Source Pullup (AS1923B). Reset remains low for a specified reset timeout period (120 ms minimum) after all voltages have stabilised. The output is valid as long as the IN1 or IN2 input voltage remains above 1 V.

The device operates from +1,0 V to +5,5 V, while consuming only 55 μA of supply current. They are available in a small 6-pin SOT23 package, suitable for operating environments ranging from -40°C to +85°C.



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