DS1232SN+

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PMICs (Power Management Integrated Circuits) are key components of many electronic systems. Supervisory circuits are a subset of PMICs and are used to monitor the power supply, as well as thermal and other system requirements. The DS1232SN+ is a low-power microprocessor supervisor IC used for high-reliability applications such as high-performance system monitoring and control.

The DS1232SN+ integrates a precision bandgap reference, a voltage detector, an oscillator, a five-reset timing circuit, and an active-low reset output transistor into a single, low-power 8-lead package that can support both +5V and +3V supply conditions. The integrated reset output transistor simplifies manual reset switching requirements and ensures reliable reset operation. The flexible reset timing circuit provides sequential and status reset functions with an adjustable timeout period.

The precision bandgap reference circuit allows the output voltage of the voltage detector to be accurately adjusted within a range of +2.50V to +3.0V. This adjustable range allows the VDD level to be easily monitored in both +5V and +3V systems. Once the voltage drops below the preset level, the output transistor is discharged, releasing reset. The pull-up resistor and capacitor connected to the reset output transistor allow an adjustable timing interval before reset is released. Such adjustable reset timing ensures proper system recovery, prevents intermittent reset operations, and maximizes system reliability.

The oscillator circuit provides a programmable time-out from reset that can be adjusted from 0.1 second to 250 seconds. This provides a much higher degree of system control compared to the typically fixed time-outs available in many other supervisor ICs. The oscillator frequency can be adjusted to match processor clock frequency, as needed.

The DS1232SN+ can also be used for status reset applications to provide internal reset release when a software reset occurs. A set of three bits on the chip can be used to detect external system status, and the reset output will be triggered accordingly. These features make the DS1232SN+ an effective, intelligent supervisor solution.

In summary, due to its low power design and integrated reset output transistor, the DS1232SN+ is an ideal solution for high-reliability applications and systems that require precise monitoring and control. It supports adjustable reset timing, reset release at either +5V or +3V system levels, and status reset for software reset. This makes it an indispensable microprocessor supervisor IC for many high-performance systems.

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