ADM691SQ

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Adm691sq is a supervisory circuit of the power management integrated circuit (PMIC) family, which aims to reduce risks during power loss and provide reliable device reset during power up conditions. It is most suitable for use in applications where proper system operation would be compromised due to power interruptions. It provides hundreds of microsecond of reset asserted time and is capable of initiating accurate reset even in the presence of noisy power sources. The device consists of an adjustable voltage supervisor, current limiter, N-channel power MOSFET switch and hysteretic circuitry.

The main function of ADM691SQ is supply voltage/ground and reset supervision. The main features of this device include precision analog and digital circuitry for monitoring the supply and ground voltages, current limiting and P-channel status outputs. The adjustable voltage supervisor monitors the supply voltage with high accuracy and reliability, even in the presence of noisy or dynamic power sources. It also provides the flexibility to set the reset threshold window based on the system requirement. The Hysteretic Comparator provides supply voltage glitch immunity and better accuracy than typical voltage supervisor circuits. The reset output on this device is active-low and is asserted based on the condition of the supply voltage and optionally, a manual reset input.

The working principle of ADM691SQ revolves around its adjustable voltage supervisor, which is a circuit that continuously monitors the voltage of a power supply. It has a preset threshold window, within which the supply voltage must be maintained in order for the device to function correctly. When the voltage in the supply drops below the lower threshold or is above the upper threshold, the active-low reset output pin is asserted and the circuit is reset. This feature prevents data loss or other malfunctions of the system due to power fluctuation or disruption. This adjustable voltage supervisor also supports an optional manual reset, so that the circuit can be reset manually when needed. The other device features such as current limiter, N-channel power MOSFET switch and hysteretic circuitry work together to ensure the circuit functions correctly and reset is initiated promptly even in the presence of noisy power sources.

Overall, ADM691SQ is a reliable supervisory circuit that helps prevent system malfunctions due to power related issues. It can work with both standard and noisy power sources, while providing precision monitoring and reset functionality. This makes it ideal for use in applications such as power over Ethernet (PoE) and VoIP phones where the power stability is of the utmost importance.

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