DS1831A

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PMIC - Supervisors are devices that are designed to monitor the voltage supply of circuitry and control the power to the circuit depending on the voltage levels. Specifically, the DS1831A is a micro-power supervisor integrated circuit (IC) that is well-suited to power supply sequencing and power-on reset applications. Its compact size and low operating current allows it to be used in space-constrained and power-hungry applications. In active mode, the DS1831A monitors the voltage supply and provides an active-low reset signal when the voltage drops below the set threshold. When the voltage recovers, the reset signal is released.

The DS1831A integrates a fixed voltage reference, a bandgap voltage reference and a precision comparator, which is used to detect under and overvoltage conditions. It also has an optimize thermal shutdown circuit, which prevents power from being applied if the temperature reaches a hazardous level. To allow for increased accuracy, the voltage reference and the voltage threshold can be trimmed by the user. Furthermore, the DS1831A features a low current open-drain reset output, allowing it to drive both high and low levels of voltages.

The DS1831A application fields mainly include A/D pixel sequencing, automotive infotainment systems, base stations, electronic design automation, embedded-educational systems, home appliances, laptop computers, LED lighting, multimedia equipment, on-board vehicle communication links, peripheral systems such as industrial controllers, portable medical instruments, removable storage devices and telecommunications systems.

By understanding the working principle of the DS1831A, its application field can be further understood. The DS1831A operates through voltage monitoring: the device monitors the supply voltage at the VCC pin. When the voltage drops below the reset threshold, the RESET output is driven low. The RESET output is released when the voltage goes above the reset threshold and the reset latch is reset. The reset threshold is set by the combination of an external resistor and an internal bandgap voltage reference. The open-drain reset output can be used to reset multiple systems. The device has two comparison levels for voltage reset: VTH(low) and VTH(high). It can detect both undervoltage and overvoltage conditions. Once an abnormality is detected, the latch is reset and the RESET output is driven low.

The DS1831A is designed for precision monitoring of voltage supply and power-on sequencing applications. It incorporates a trimable voltage reference that allows it to accurately detect over- and undervoltage conditions and provide a low voltage reset signal. It also includes an optimized thermal shutdown circuit, preventing the application of power in hazardous conditions. Its small size and low operating current make it well-suited to power-hungry, space-constrained applications and provides users with a robust solution for their power supply sequencing needs.

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