MAX6802UR31D3+T

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The MAX6802UR31D3+T is a voltage supervisor integrated circuit (IC) designed and manufactured by Maxim Integrated. It is classified as a PMIC - Supervisors device, which means it works to monitor and maintain the voltages in a system or IC. The MAX6802 is a flexible voltage supervisor that supports multiple reset thresholds, manual reset and watchdogs, as well as providing full supervisory functions, including reset delay, manual reset and external reset capability.

The device consists of a voltage supervisor and a synchronization timekeeper. The supervisor circuit monitors a single power supply and generates an overtemperature signal if the supply voltage is either below a set threshold or exceeds a user-defined trip point. The result of excessive voltage is a reset input to the microcontroller. The supervisor can be programmed to accept reset thresholds of +1.5V, +2.5V, and +4.2V. The timekeeper then synchronizes the reset or watchdog input to the microcontroller.

The MAX6802 provides three reset levels and two reset modes: a control reset and an extended reset. The control reset is asserted if the monitored voltage falls below the minimum reset threshold. The extended reset is asserted when the monitored voltage falls below the extended reset threshold. The reset output is active low, and the reset pulse width is programmable. The device will also reset itself if the temperature exceeds 125° C.

The watchdog function is enabled/disabled by the WDI (Watchdog Enable) pin and is triggered by the WDT (Watchdog Timer) pin. The timeout time of the watchdog timer is programmable from 1ms to 7.8 sec. The watchdog timer output is an active-low reset which is asserted for approximately 127 ms.

The thermal shutdown protection feature is enabled by a threshold voltage and is initiated when the junction temperature exceeds its threshold level of +150°C. The MAX6802 provides an overtemperature signal, TEMP, which sinks current as the temperature exceeds +150°C. An external signal at the RESET pin can also be used to initiate thermal shutdown.

The MAX6802 also offers a manual reset circuit which can be enabled by the MR (manual reset) pin. When low, the MR pin asserts the reset output to initiate a reset cycle. The manual reset output is synchronized to the applied microcontroller clock.

To summarize, the MAX6802UR31D3+T is a robust voltage supervisor IC designed for a variety of applications. It offers multiple reset thresholds and manual reset capability, as well as watchdogs and overtemperature protection. This highly versatile device is designed to provide reliable operation over a wide set of conditions. The MAX6802 is a cost-effective solution for voltage supervisor applications.

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