ADM809RARTZ-REEL

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PMIC (power management integrated circuit) generally refers to an integrated circuit with multiple power management roles. Among them, supervisors are one of the most important components, and they provide reliable power supply protection and monitoring functions. The ADM809RARTZ-REEL, which belongs to this kind of PMIC, is a used widely in different scenarios and applications. This article will mainly focus on the application field and working principle of this PMIC device.

The ADM809RARTZ-REEL is a voltage supervisor integrated circuit based on the ADM809 family, designed with active low reset output, adjustable reset thresholds, manual reset input and precision voltage reference. It can be used as system-level reset distribution, automatic reset generation and voltage monitor in different applications, and is widely used in computer systems, telecommunications, power applications, automotive and industrial applications. The features make the ADM809RARTZ-REEL an ideal choice for the overall protection and monitoring of the system power supply.

The ADM809RARTZ-REEL integrates an internally calibrated 2.5V voltage reference, TOCR (time-out counter reset) circuit and reset output. The circuit supports reset low threshold voltage as low as 2.23V, so as to accurately monitor the system\'s power supply voltage (VDD). The ADM809RARTZ-REEL also includes a built-in time-delay circuit and manual reset input, which can provide interval reset adjustment to prevent the reset circuit getting stuck in the abnormal reset state.

The ADM809RARTZ-REEL "monitors the DC voltage supplied to the VDD pin" when working. If the input power supply voltage VDD falls below the reset threshold voltage, the internal comparator will immediately detect the voltage drop and trigger the reset output. At the same time, the reset output will stay low for the set period of time, and once the reset period is over, the output will turn high and the system will reset. During normal operation, the voltage reference and comparator will monitor and compare VDD against the reset voltage threshold continuously, and the reset output will promptly respond to any sudden drops.

The reset threshold voltage of the ADM809RARTZ-REEL can be externally adjusted with the ADJUST pin voltage. The voltage range of the adjustment pin is 0.6V-Vref(2.5V), and the reset threshold voltage is proportional to the voltage at the adjustment pin. The TOCR circuit uses a toggle flip-flop comparator to detect an excessive reset pulse and prevent the reset output from being stuck in low state.

The ADM809RARTZ-REEL can be used with external capacitor to delay the power-on reset. When the voltage at the VDD pin is below the minimum Vib, it will generate a power-on reset pulse only after the external capacitor has reached a certain voltage value. In addition, the ADM809RARTZ-REEL includes a standard manual reset input pin, and external control logic can use this pin to control the reset output.

In summary, the ADM809RARTZ-REEL is a highly integrated voltage supervisor IC with a wide range of applications. It functions as a system-level reset generator and a voltage monitor, and can be re-used in different scenarios. Additionally, the ADM809RARTZ-REEL includes built-in precision voltage reference, adjustable reset thresholds and manual reset input, which contribute to highly efficient and reliable system protection.

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