Power Electronics / Power Management


Ultra low voltage MCU supervisors

8 August 2007 Power Electronics / Power Management

The AS1925 and AS1926 from austriamicrosystems are designed to monitor supply rails of 0,9 V to 1,5 V in microprocessor and digital systems, without the need for external components, and force a reset if the monitored supply voltage drops below its reset threshold. A variety of different factory-trimmed voltage thresholds from 0,81 V to 1,425 V are available for monitoring 0,9 V, 1,2 V and 1,5 V supplies with 5% or 10% tolerances. The AS1925 features both a push-pull active-high and active-low reset output, while the AS1926 offers a push-pull active-high and an open-drain active-low reset output. Resets can be forced for a specified reset timeout period, such as 1,5 ms, 30 ms, 210 ms and 1,68 s, after the voltage has stabilised. The active-low output is valid as long as the supervised input voltage remains above 0,55 V. Both devices operate from +0,55 V/0,75 V to +1,8 V, while consuming only 3,5 μA of supply current, and are available in a 5-pin SOT23 package suitable for operating environments ranging from -40°C to +85°C.



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