ADM1812-5ARTZ-REEL

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PMIC (Power Management IC) - Supervisors are widely used integrated circuits for providing system self-protection and fault notification. The ADM1812-5ARTZ-REEL IC from Analog Devices is a low-voltage supervisor with an adjustable reset threshold and active-low open-drain RESET output. In this article we discuss the application field and working principle of this IC.

Application Field

The ADM1812-5ARTZ-REEL IC is designed for a wide range of industrial applications. It can be found in both commercial and automotive applications since it supports a wide supply voltage range of 2.3V to 5.5V. This supervisor IC is well-suited for applications such as automotive, power supplies and battery management, due to its ability to monitor current, voltage and temperature. Additionally, it can also be used in medical, communications, audio and consumer equipment.

Working Principle

The ADM1812-5ARTZ-REEL consists of a voltage supervisor, with an adjustable reset threshold and an OPEN-DRAIN, active-low reset output. The supervisor has two power domains, which are the Auxiliary Supply pin (ALS) and the Main Supply pin (MSC). ALS, which must be provided before the Main Supply (MSC), is responsible for providing the reset supply for the reset generator and for driving the open-drain RESET output. MSC is the power input, and is used to monitor the voltage. Both LSD and MS are designed to work with a wide voltage range of 2.3V to 5.5V.

The reset threshold of the IC can be adjusted, by connecting a resistor from the SFTH pin to ground and connecting a capacitor from the FAST pin to ground. This allows the threshold voltage sensing to be changed, thereby extending the operating range. When the voltage drops below the threshold, the RESET output is pulled low and the RESET pin of the IC is pulled low, signalling an error.

The device also supports a watchdog timer, which can be used to monitor system health. The watchdog timer is a timeout feature which is triggered when the reset is not triggered within a certain time period. This ensures that the system is restarted in the event of an error or system hangup. The watchdog timer can be programmable, with a programmable parameter setting the time period.

The IC is also designed to monitor current, voltage and temperature, and it is capable of reporting failures when these parameters are out of the desired range. This provides a means of detecting and responding to power-related and thermal issues.

The device has an in-house watchdog timer for fault reset and to prevent false reset stages. The IC also uses different comparison ranges with hysteresis, which prevents spurious reset trigger during power-on reset and during power-down. The ADM1812-5ARTZ-REEL also has extended temperature range, which makes it suitable for automotive applications.

Summary

The ADM1812-5ARTZ-REEL from Analog Devices is a low-voltage supervisor with an adjustable reset threshold and active-low open-drain RESET output. It is designed for a wide range of applications, and is well-suited for applications such as automotive, power supplies and battery management. The supervisor uses two power domains, ALS and MS, which have a wide voltage range of 2.3V to 5.5V. It supports a watchdog timer and can monitor current, voltage and temperature. It also uses different comparison ranges with hysteresis and has an extended temperature range. All these features make it a versatile and reliable IC.

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