MAX6794TPLD2+T

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The MAX6794TPLD2+T is a popular PMIC or power management integrated circuit (IC) supervisor. This highly integrated device provides system reset, watchdog timer, tamper detect, and supervisor functions. It is available in a space-saving 4-pin 2x2mm TDFN-EP package. In this article, we will take a look at the application field and working principle of the MAX6794TPLD2+T.

The MAX6794TPLD2+T is primarily intended for use in portable systems and telecoms, where high accuracy and small size are the primary design requirements. Its application field includes any system needing supervisory circuits, such as battery-supplied embedded systems, handheld terminals, cellular phones and tablets, industrial control and medical instruments, laptop and notebook computers, etc.

In addition to reset and watchdog timer functions, the MAX6794TPLD2+T also offers a tamper detect function. This provides a tamper detect on the VDD and VV sourcing current from the application. This tamper detect circuitry monitors the VDD and VV voltage levels at each power-up.

The MAX6794TPLD2+T is supplied in both 2.5V and 3.3V versions. The device includes a supply voltage monitor, voltage detection and reset output. The MAX6794TPLD2+T provides an input to source a reset pulse width that can range from 0.5ms to 8s. The device has a wide reset voltage range, from 0.95V up to 3.450V.

The Supply Monitoring unit monitors the main operating voltage, VIN, and detects any out-of-range conditions. When an out-of-range condition is detected, the device outputs an active-low reset signal and pulls the RSTO pin low.In addition, the device offers an internal watchdog timer for monitoring the stability of the system, and a tamper detect for key events of the application.

The MAX6794TPLD2+T also offers a watchdog timer (WDT) to enhance system stability and reliability. The WDT monitors system operations during the startup sequence and periodically during normal operation. The WDT is enabled by a simple start-up timing sequence. When the WDT times out, the device will issue a reset signal.

The MAX6794TPLD2+T also offers a tamper detect (TD) function. The TD circuit monitors changes in the operating supply voltage and system temperature, in order to detect key events such as power surge or unexpected system temperature events. When an event is detected, the TD output line will be activated in order to alert the application.

In summary, the MAX6794TPLD2+T is a highly integrated PMIC-based supervisor device. It provides system reset, watchdog timer, and tamper detect functions in a very small, low-power package. Its wide range of reset and tamper detect features make it ideal for portable systems and telecoms, where high accuracy and small size are key design requirements.

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