MAX6855UK28D3+T

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PMIC - Supervisors are often used in power systems to provide signs of processor reset, power on reset, edge and level-sensitive reset, delayed reset, and inhibit reset. MAX6855UK28D3+T is one of these supervisors with features such as low operational voltage, low cost, and high performance. This article will cover the application field of MAX6855UK28D3+T and its working principle.

Application Field

The MAX6855UK28D3+T is a supervisor designed to watch and supervise microprocessor/DSP-based systems, and is most suited for high-speed applications such as communications, voice processing, image processing and data management. Specifically, this device is intended for applications where thermal performance and low-voltage operation are required. It is ideal for applications that require multiple power sources and a supervisor to detect supply voltages.

The MAX6855UK28D3+T is capable of monitoring and controlling up to five power supplies, and has a high input impedance, making it compatible with a wide range of processors. Additionally, the supervisor has status outputs for monitoring power supply status and reset levels, as well as an integrated reset delay. The power-fail comparator also features an adjustable VDD monitor threshold and a fast recognition time of 280ns.

Features and performance

The MAX6855UK28D3+T is a very versatile device, as it can monitor up to five voltage levels, diagnose soft faults and implement a reset cycle as needed. Its output voltage levels can be adjusted up to 5.5V with very low operating power (less than 1uA). In addition, it offers adjustable supply monitoring thresholds for the voltage inputs, enabling the product to recognize a wide range of input voltages.

The supervisor also offers various features to enhance its performance. These include a programmable reset cycle, adjustable power supply voltage thresholds, and comparator thresholds adjustable from 1.2V up to 5.5V. Furthermore, the reset signal output is internally glitch-free, ensuring that the device is able to properly detect and respond to changes in any of the five monitored supply voltages.

Working Principle

The MAX6855UK28D3+T is an integrated device designed to supervise five supplies, detect faults and ensure safe sending of reset signals to the processor/DSP. It is composed of five comparators and a reset output FET. Each of these comparators will watch one of the monitored supplies and compare its input voltage against the set threshold. When the set threshold is exceeded by the monitored supply, the comparator will raise an alert and the reset output is triggered, informing the processor/DSP of the fault.

In addition to the five comparators, the MAX6855UK28D3+T also includes a reset delay timer which is used to further extend the reset signal. The purpose of this delay timer is to allow the system to automatically reset if the voltage is unable to return to the expected threshold within a specific time period. The delay timer is programmable, allowing for different reset signal lengths.

Conclusion

The MAX6855UK28D3+T is a versatile device well suited for a variety of applications where thermal performance and low-voltage operation are required. Its features include a wide range of adjustable voltage thresholds, comprehensive reset signal generation, fast recognition time, and integrated reset delay. The supervisor is capable of monitoring up to five power supplies, ensuring safe sending of reset signals to the processor/DSP, and diagnosing soft faults.

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