ADM8319WB31ARJZR7

ADM8319WB31ARJZR System supervisors

The ADM8319WB31ARJZR is a system supervisors with analog, reset, watchdog, and power-on-reset features used for monitoring and controlling power applications. It is a very low power, high accuracy single-supply voltage supervisor with a 100 mV threshold accuracy. The ADM8319WB31ARJZR stays in sleep mode until a power supply issue is detected, at which point it will take charge to reset the system and turn it off. The supervisor is ideal for applications that require a large number of system power cycles or an extended battery life.

Features

The ADM8319WB31ARJZR is an analog system supervisor with a wide operating voltage range of 2.7V to 5.5V. It provides an active-low, open-drain reset output that can act as a system reset in response to undervoltage or extended power-on reset conditions. It also can generate an active-low reset pulse in response to a watchdog signal (WDT0) and optionally provide an active-low reset signal if the watchdog circuit enters a fault condition. The supervisor features an active-high reset signal, WDT1STRT, that can be used to reset the watchdog timer.

Applications

The ADM8319WB31ARJZR is designed to be the primary source of reset and power-on monitoring in many applications, including those that require high accuracy, low power, reset and watchdog functions. Examples of applications that can benefit from using this device include automotive embedded systems, industrial control systems, consumer appliances, and computing systems.

Operating principle

The ADM8319WB31ARJZR monitors power supply rail voltages with a 100 mV threshold accuracy, and issues an active-low, open-drain reset signal (RESET) when power supply rail voltages go below the threshold voltage. A visible open-drain output connected to the output of the supervisor will show the reset state of the system. Additionally, a programmable comparative input (COMP) allows the user to compare any voltage rail to the threshold to generate a reset or an active-high reset signal in response to an undervoltage event.

The ADM8319WB31ARJZR also has two watchdog inputs (WDT0 and WDT1) which are connected to a watchdog controller. WDT0 and WDT1 are configured to toggle state on each pulse edge, and can be used to trigger a reset pulse if a watchdog timeout is reached or a fault condition is detected. A programmable timeout period is available for either input.

A pull-up resistor tied to 5V, an external load, or an adapter chip can be used to control the pull-up resistor that drives the reset output to a valid logic level. An input circuitry connected to the load sense input (LD_SNS) allows the supervisor to detect the presence of a load, and set the reset output accordingly.

Conclusion

In conclusion, the ADM8319WB31ARJZR system supervisor is a low power, high accuracy supervisor that monitors and control power applications. It can generate a reset or an active-high reset signal in response to an undervoltage event, as well as issue an active-low, open-drain reset signal in response to a watchdog timeout or fault condition. It is ideal for applications that require a large number of system power cycles or an extended battery life, and can be used in many applications such as automotive embedded systems, industrial control systems, consumer appliances, and computing systems.