Supervisory Circuits

Supervisory Circuits

Analog Devices power supply voltage monitors and microprocessor supervisors monitor positive and negative power supplies, with integration of up to eight supply monitors in a tiny package. These devices generate a reset signal if any power supply goes above or below the user-defined threshold. Reset times are usually fixed at 200 ms or are adjustable with a single capacitor. Aside from power supply monitoring, CPUs and ASICs can also be supervised by an integrated watchdog timer.

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Dual-Supply Monitors

Analog Devices dual-supply supervisory circuits help simplify design due to their high accuracy, adjustable thresholds and tolerances, and a guaranteed reset signal down to an industry-leading low of 0.5 V. Most ADI supervisors exhibit ±1.5% threshold accuracy around the nominal threshold voltage—minimizing the required system voltage margin and probability of system malfunction. Voltage supervisors with adjustable or pin-selectable thresholds and tolerances provide users with maximum flexibility, allowing a single part to be used across multiple designs.

Quad or More Supply Monitors

Analog Devices quad-supply supervisory circuits help simplify design due to their high accuracy, adjustable thresholds and tolerances, and a guaranteed reset signal down to an industry-leading low of 0.5 V. Most ADI supervisors exhibit ±1.5% threshold accuracy around the nominal threshold voltage—minimizing the required system voltage margin and probability of system malfunction. Voltage supervisors with pin or I²C/SMBus adjustable thresholds and tolerances provide users with maximum flexibility, which allows a single part to be used across multiple designs.

Single-Supply Monitors

Analog Devices single-supply supervisory circuits offer many benefits that help simplify design, such as high accuracy, adjustable thresholds and tolerances, and a guaranteed RESET signal down to a low supply voltage. Most ADI supervisors exhibit ±1.5% threshold accuracy around the nominal threshold voltage, minimizing the required system voltage margin and probability of system malfunction. Voltage supervisors with adjustable or pin-selectable thresholds and tolerances provide users with maximum flexibility, allowing a single part to be used across multiple designs. ADI supervisors also guarantee a valid reset signal to an industry-leading low of 0.5 V to help preserve system integrity.

Supply Monitors with Watchdog Timers

ADI offers a range of supervisory circuits with watchdog timers with multiple reset threshold options available throughout the portfolio.

Triple-Supply Monitors

Analog Devices triple-supply circuits offer many benefits that help simplify design, such as high accuracy, adjustable thresholds and tolerances, and a guaranteed reset signal down to a low supply voltage. Most ADI supervisors exhibit ±1.5% threshold accuracy around the nominal threshold voltage, which minimizes the required system voltage margin and probability of system malfunction. Voltage supervisors with adjustable or pin-selectable thresholds and tolerances provide users with maximum flexibility, allowing a single part to be used across multiple designs.

Watchdog Timer Only

Supervisory circuits with watchdog timers from Analog Devices reset the microprocessor if it fails to strobe within a preset timeout period, with multiple reset threshold options available throughout the portfolio. By consuming as little as 3 µA, our supply monitors are suitable for use in low power applications, as well as automotive infotainment, microprocessor systems, intelligent instruments, supervising DSPs/microcontrollers, and industrial and portable equipment wireless systems.