ADM8691ARN-REEL

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PMIC - Supervisors are a category of devices used in various electronic circuits, which are responsible for monitoring the system supply voltages and other parameters, such as temperature, and providing signals when these values exceed their provided thresholds. One example of this is the ADM8691ARN-REEL, an integrated voltage supervisor and programmable Watchdog timer in a small SOT-23 package, which combines two of the most critical functions for system operation in a single, space saving solution. This device can provide protection for a wide range of consumer and commercial applications, such as diverse consumer electronics, automotive systems, computer motherboards, and many more.

The ADM8691ARN-REEL has a wide range of features, starting with its ability to monitor up to four external power supplies. It uses an internal 1.2 V voltage reference to monitor the input supplies, and it provides an adjustable reset timeout threshold, typically ranging from 10 ms up to 2.7 s. Furthermore, it has a programmable Watchdog time-out period, with a range of 1 ms to 6.3 s, while its operating temperature range is −40°C to +125°C.

The ADM8691ARN-REEL’s working principle is based on Atmel’s very own patented High-Side Power Switching architecture. In this architecture, it is a high-side power switch and works by connecting the power supply to its input supply VIN and to the system, which is monitored by monitoring Vin, V_out and temperature. When an undesired condition is detected, this power circuit will switch off the input supply from the system, preventing it from potentially causing damage.

The ADM8691ARN-REEL is designed for a wide range of applications beyond those mentioned above. It can provide system reset and Watchdog timer monitoring for systems with 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V and 1.2V power rails. It can also be used in conjunction with other components, such as MOSFETs or voltage regulators, to provide system restart or auto power down protection in various environments or applications.

When it comes to implementation, the ADM8691ARN-REEL can be easily interfaced with most microcontrollers, which can be done through its I2C/SMBus interface. Additionally, the device offers design flexibility through its two configuration modes: the user’s programmable mode, where the user can program different settings such as the reset timeout threshold, and the factory-programmed mode, where the device is programmed as a stand-alone device, allowing for a simplified process.

The ADM8691ARN-REEL is an excellent supervisor device for a wide range of applications, offering a small size, high accuracy, programmability and flexibility, and quick reaction time for reset and Watchdog timer monitoring. Its combination of features and its ability to provide power-down protection makes it one of the best supervisors available in its class.

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