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ADM707ANZ Application Field and Working Principle

The ADM707ANZ is a member of the PMIC (Power Management Integrated Circuit) family of products from Analog Devices. This particular part is a supervisor and provides a variety of features related to system power management and system reset functions. Specifically, it is an advanced, low power supervisor designed to monitor system power supplies and provide manual or automatic reset and supply sequencing. It also features an integrated voltage readback and external pins and push-buttons for system reset.

The ADM707ANZ is designed to monitor two supplies, VDD and VDD2, which can both be either single-ended or split supplies. It can be used to monitor both continuous and pulsed supplies. It provides power-on reset, window watchdog and supply output sequencing. In addition, it provides manual reset capability and extensive monitoring and control over system power supplies and sequencing. Its design allows it to be used in many applications including microcontrollers, DSPs, FPGAs, ASICs, and other embedded processors, as well as in systems, such as routers, switches, hubs, and other network and computing equipment.

Principle of Operation

The ADM707ANZ operates using two different modes of operation, Active and Standby. When powered on, the ADM707ANZ enters Active mode, where all the monitoring and reset functions are active and in operation. During this mode, the ADM707ANZ monitors the power status of the two supplies, and if either supply falls outside the specified operating range, a reset will be triggered. The ADM707ANZ also provides supply exclusion logic that can be used to keep two power supplies from trying to operate at the same time. This is useful when one power supply needs to be powered down before the other one is turned on.

The Standby mode is entered if both supplies remain within the acceptable voltage range. In this mode the ADM707ANZ stops monitoring the supplies and turns off most of its circuitry, removing most of the supply current. This reduces the power consumption of the device and can help ensure system designs remain power efficient.

The ADM707ANZ also features an integrated voltage readback function, which allows external circuitry to read the voltage of the supplies and make sure they are within the requested operating range. This is particularly useful in applications where high accuracy is necessary, as the readback gives the user the ability to measure the actual voltage of the supplies rather than relying only on references ands voltage dividers.

Finally, the ADM707ANZ also provides manual reset and external push-buttons for system reset. This is useful in cases where a system needs to be manually reset in order to start the power steps from the beginning. The push-buttons can also be used for other applications such as system diagnostics. The ADM707ANZ also provides an SPI port for reading supply voltage and reset status of the device.

Applications

As mentioned earlier, the ADM707ANZ is an advanced low-power supervisor designed to monitor system power supplies and provide reset and supply sequencing. It can be used in embedded systems, microcontrollers, DSPs, FPGAs, ASICs, and other applications where power management is critical. It is also suitable for use in telecom, transportation, and medical systems, as well as high-end routers and switches.

In addition, the ADM707ANZ is also well-suited for use in computing platforms, such as laptops, desktops, and server processors. The voltage readback feature allows the user to check and verify system power supplies, ensuring the system is operating correctly before any other components are powered up. This is especially useful for power-sensitive applications and for group power-up sequencing.

The ADM707ANZ can also be used in a variety of other applications that require manual reset, such as test and measurement systems. In these cases, the safety-override push-buttons can be used to reset the system if needed. The pull-up current feature also allows the reset pins to be controlled by an external circuit.

In summary, the ADM707ANZ is a powerful and versatile supervisor that offers a variety of features and can be used in a wide range of applications. Its integrated voltage readback feature allows users to verify system power supplies and its manual reset push-buttons make it suitable for a variety of applications.

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