MAX697EWE+T

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The MAX697EWE+T is a general purpose supervisory circuit. It is a member of the Power Management ICs (PMICs) supervisory family and is used in applications where monitoring of the VCC (supply voltage) is needed. It is used to provide reset and low power supply warning signals and is suitable for controlling the system reset in MCUs, DSPs, ASICs, and FPGAs. With its fast reset time and low power consumption, this supervisory circuit is also appropriate for applications where a high refresh rate for a critical circuit is required.

The MAX697EWE+T is an adjustable reset and low voltage supervisor providing an active-low reset signal and a low voltage warning signal. The reset process begins when the supply voltage falls below a fixed voltage threshold level – typically 3V. The reset threshold is user settable with external resistors. This circuit also incorporates a low voltage warning flag that initiates when the supply voltage drops below a user programmed lower voltage level (typically 2.4V). The reset and flag circuit is fully guaranteed over the supply voltage range of 1.3V to 6.0V.

The reset and warning flag outputs of the MAX697EWE+T offer true logic levels with no additional pullup/pulldown resistors. This makes the device highly suitable for monitoring the power supply of low power microprocessors, DSPs, ASICs, and FPGAs.

The reset timeout feature of the MAX697EWE+T is determined by an external capacitor connected between the RTO pin and ground. The reset timeout value is selected to be greater than the power-on reset (POR) duration. It is important to realize that the peripheral devices connected to the RTO pin may interfere with the normal operation of the device, so they should be carefully chosen and tested.

In normal operation, the MAX697EWE+T monitors the state of the supply voltage and will issue a reset signal to the host system when the voltage drops below the chosen threshold. This reset signal will cause the system to reset and reinitialize. The reset duration is determined by a capacitor connected to the RTO pin. The warning flag will also be issued at a lower threshold.

The low power consumption of the MAX697EWE+T circuit is an important advantage, as it allows for extended battery life in mobile applications where the VCC supplies must be closely monitored. As an added bonus, the reset threshold voltage is user adjustable and the device can be used to monitor multiple power supply voltages simultaneously via separate inputs.

Overall, the MAX697EWE+T supervisory circuit is an ideal choice for applications that require voltage monitoring, low power consumption and adjustable reset thresholds. It is well suited for applications such as powering microcontrollers, networks and devices with multiple supply voltages. Additionally, because the reset signals are true logic levels and the device is small, it can be implemented easily in tight spaces.

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