DS1233DZ-5

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Power management integrated circuits (PMIC) are specialized integrated circuits that provide efficient and reliable power converter solutions for a wide variety of applications. Among them, supervisors can provide a range of benefits, from monitoring power conversions and system power-on reset (POR) protection to detecting changes in system and power rail voltages. This article looks at the DS1233DZ-5, one such supervisor, and examines its application field and working principle.

The DS1233DZ-5 is a precision reset supervisor and power-on reset generator from Texas Instruments. It is designed specifically for system and power sequencing in advanced graphics cards, enterprise-level servers and other computing applications. It features a watchdog timer for system health monitoring and a precision reset generator for a wide range of input voltages, from 1.5V to 5.5V. It also comes with an internal bandgap reference with ±1% accuracy over the full temperature range of -40°C to 125°C.

The DS1233DZ-5 has several applications. First, it provides an advanced system health monitoring capability. This includes a watchdog timer which has an accuracy of ±2%, internal or external reference resistor, and an adjustable reset threshold of 2.6V to 5V. This allows it to detect a wide range of system faults, including overvoltage, undervoltage, or an excessive temperature condition. It can then provide a reset or annunciation to the host for signaling the user to take corrective action.

The DS1233DZ-5 is also used for power sequencing. This is done via its precision reset generator, which can accurately monitor the supply voltage and detect any drops caused by power surges. This can be used to create reset sequences during the startup of the system, ensuring that all the power rails in the system are up and running before the system is initialized. This prevents any unexpected errors that may arise due to an incorrect configuration at startup.

In addition, the DS1233DZ-5 is also capable of detecting small changes in the system and power rail voltages. This is done using its internal voltage comparator, which is designed to detect a voltage drop below the reset threshold. This ensures that system stability is maintained, and that any unexpected changes in the power rail voltage can be quickly detected and dealt with.

As for the working principle, the DS1233DZ-5 operates by monitoring both the power supply rail and the system supply rail for voltage drops. When the voltage drops below a certain threshold, the internal comparator triggers a reset signal. If a power-on reset is desired, the internal watchdog timer can be configured to generate a reset. Once the reset or annunciation has been triggered, the system can begin to initialize.

In conclusion, the DS1233DZ-5 is an effective and reliable power management IC that can be used in a wide range of applications. It provides advanced system health monitoring capabilities and has the ability to detect voltage drops or surges in the power rails, as well as small changes in the system and power rail voltages. Furthermore, its precision reset generator ensures accurate power sequencing during system startup. This makes it a valuable tool for reliable and efficient power conversion.

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