MAX6833VXRD0+T

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Introduction

The MAX6833VXRD0+T is a specialized, parameterizable Integrated Supervisory Circuit (ISC) developed by Maxim Integrated. This ISC combines a watchdog timer and a voltage supervisor, configured to provide system reset with an adjustable, programmable timeout period, from 1.0 second to 2.5 seconds. Voltage supervisor pins are available to monitor multiple power rail voltages and provide maximum flexibility for customers. The time-out period for reset is adjustable, so customers can select the time-out period and have one part for different applications.

Application Field

The MAX6833VXRD0+T is typically used in automotive and industrial applications. These include engine control units, braking system control units, transmission control, power control units, and distributed control systems (DCS). In automotive applications, the supervisor is particularly useful for resetting microcontrollers after a watchdog timeout. It can also be used to provide power failure lockout in vehicle passenger systems such as in-dash navigation and multimedia.

In industrial applications, the MAX6833VXRD0+T ISC can be used, for instance, for distributed control systems, for programmable logic controllers (PLCs), for monitoring and switching applications or for low power systems.

Working Principle

The MAX6833VXRD0+T Integrated Supervisory Circuit combines a reset and supervisor functions in one chip. The reset functionality is provided by the watchdog timer, while the voltage supervisor circuitry monitors the voltage in multiple power rails. Reset signal can be configured with system reset or manual reset. When the watchdog timer is triggered, the signal is sent to the output pins to reset the system and the timer is automatically re-armed after the reset.

The voltage supervisor section of the IC monitors multiple power rails and provides a reset signal when any of the monitored voltage drops below its programmed threshold. This reset signal can also be configured with system reset or manual reset. The thresholds can be programmed from 1.9V to 4.2V.

Conclusion

The MAX6833VXRD0+T is a specialized, parameterizable Integrated Supervisory Circuit (ISC) that combines both watchdog timer and voltage supervision functions into one IC. It is typically used in automotive and industrial applications and provides system reset with an adjustable, programmable timeout period. Reset signals can also be configured with system reset or manual reset signals, and voltage thresholds can be programmed for different applications.

The ISC offers customers a single part solution for variable applications, with no need to keep multiple parts in stock. The MAX6833VXRD0+T enables a system to be reset or kept running in the event of a power fault or CPU reset.

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