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Supervisory ICs flaunt battery backup feature

Posted: 20 Feb 2009     Print Version  Bookmark and Share

Keywords:power-supply monitoring  battery-control  supervisory circuits 

From Maxim Integrated Products comes the MAX16016/20/21/23/24 low-power, microprocessor supervisory circuits featuring precision power-supply monitoring and battery-control functions.

Delivering optimal performance in small TQFN or TDFN packages, these supervisory circuits integrate a variety of features including a microprocessor reset circuit, battery-backup switchover, power-fail warning, and chip-enable (CE) gating. Their high integration simplifies designs and minimises the number of components required for power-supply monitoring. The MAX16016/20/21/23/24 are suitable for a wide variety of applications such as point-of sale terminals, industrial equipment, fax machines, computers and STBs.

To protect critical data, these devices automatically switch the real-time clock or RAM power source to the backup battery when Vcc falls below the reset threshold and Vbatt. A reset output asserts when Vcc is below the reset-threshold voltage and for at least 145ms after Vcc returns above its threshold. This reset output prevents code-execution errors during power-up, power-down, and brownout conditions. Each device offers an active-low, push-pull reset or an active-low, open-drain reset. A power-fail comparator signals an interrupt when Vpfi falls below 590mV or when Vcc falls below the reset threshold.

The MAX16016/20/21/24 also include a battery-on output during battery-backup mode and a watchdog function that triggers a reset pulse whenever WDI remains high or low for longer than the watchdog-timeout period. The MAX16020/21/24 provide internal gating of the CE signals to prevent erroneous data from corrupting the CMOS RAM. The MAX16023/24 integrate a low-dropout regulator capable of delivering up to 100mA; a manual-reset input; and a user-adjustable reset input for monitoring a second voltage.

The MAX16016/20/21/23/24 consume only 1.2µA of quiescent current and operate from as low as 1.53V. Fully specified over the -40°C to +85°C extended temperature range, they are available in 8-/10-pin TDFN or 16-pin TQFN packages. Pricing starts at Rs.123.30 ($2.48) (1,000-up, FOB USA).

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