MAX6792TPWD2+

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The MAX6792TPWD2+ is designed to monitor the various voltages in a power system, provide power-on-reset, and detect power supply faults in a system. It is an ideal solution for applications such as telecommunications, Ethernet switches, data storage, and other applications with complex power strategies. This article will explain the application field and working principle of the MAX6792TPWD2+.

Application Field

The MAX6792TPWD2+ is an ultra-low-power voltage supervisor with an internal voltage detector that includes an adjustable threshold and unique glitch-less reset output. Its internal voltage detector monitors the positive and negative voltages in a system and its wide supply voltage range of 2.25 V to 5.5 V provides flexibility in monitoring as well as in powering the device. This device is designed to provide graceful reset in order to keep a system continually running through multiple voltage dropouts on either its monitored voltage lines or its use of the main power supply voltage. This makes the MAX6792TPWD2+ a suitable choice for noisy systems, such as communications and USB-based systems.

The MAX6792TPWD2+ supports two independent voltage detectors, allowing more complex monitoring functions. It can be used to detect an undervoltage, an overvoltage, a power-on reset, or a battery voltage level. It has a wide range of detection voltage, from 2.000 V to 5.500 V. It also has many push-button reset timing choices for quick and safe modern day system reset needs. For increased system safety, the Watchdog Action Time (WAT) can also be used to reset a system if it’s found to be operating in an out of spec condition.

In addition, the MAX6792TPWD2+ offers monitoring accuracy of ±2.5% (Typ) over conditions of -40°C to +85°C, with a unique glitch-less reset output. This makes it ideal for applications such as industrial devices, automotive systems, and variety of telecommunications systems that require detection of low and high voltage level events.

Working Principle

The MAX6792TPWD2+ uses an internal DC-DC controller and an analog comparator to monitor the power supply voltages in a system. The DC-DC controller generates a reference voltage from 0 to VCC and compares it with the voltage applied at its IN pin. When the IN pin voltage is equal to the reference voltage, the output of the comparator is pulled low, triggering a reset.

The watchdog timer facilitates reset when the system is unable to respond within a specified amount of time. The user can set the watchdog timer’s timeout period and when exceeded, the MAX6792TPWD2+ will assert reset to the system. The watchdog timer is enabled when the user closes the input by pushing the Watchdog Trip Input (WTI) pin. The WTI pin also has an internal pull-up that allows it to be used as an active low input.

The MAX6792TPWD2+ also has a push-button reset input (PBRI) pin. This pin allows the user to cause a reset of the system. By pulling the PBRI pin low, the MAX6792TPWD2+ will assert reset to the system. This pin can be pulled low externally or by the MAX6792TPWD2+ itself, depending on the configured mode. Both the watchdog timer and the push-button reset are glitch-less reset which means, at the instant of the reset, the reset acts as a latch and cannot be reversed until the power source is removed.

The MAX6792TPWD2+ has integrated low EMI and low power shutdown bias modes that reduce its noise level in the environment. This makes the MAX6792TPWD2+ an excellent choice for sensitive applications, such as medical equipment, where low EMI and low power shutdown are essential.

Conclusion

The MAX6792TPWD2+ is an ultra-low-power voltage supervisor designed to monitor various voltages in a system. It features integrated low EMI and low power shutdown, wide supply voltage range of 2.25 V to 5.5 V, and an adjustable threshold for improved accuracy in voltage detection. Its reset output is glitch-less, providing graceful reset and preventing any short reset cycles from occurring. Its watchdog timer and push-button reset input make it suitable for applications such as telecommunications, Ethernet switches, and data storage. All these features make the MAX6792TPWD2+ an ideal choice for applications with complex power strategies.

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