MAX6769TALD2+T

Introduction

The MAX6769TALD2+T is part of the PMIC - Supervisors category and is a combination of a voltage supervisor and a watchdog timer, that are most commonly used in applications that require power monitoring and system-level reset. This device works together with a reset controller, such as the MAX6820, to provide a total supervisory solution. The MAX6769TALD2+T is suitable for medium and low-end applications that require the supervision of power and reset functions. Its integration into reset controllers eliminates the need for multiple components and therefore decreases the overall BoM (bill-of-materials) cost.

Application Field and Scope

The MAX6769TALD2+T is designed to be used in a variety of different applications, such as system power-up, automotive infotainment, digital home appliance and home entertainment system, white goods and medical equipment. The device is capable of monitoring multiple power rails simultaneously and providing system reset on out-of-range conditions. It is compatible with 5 V and 3 V logic families and can be used in conjunction with an RTL (reset-timer logic) reset device.

Features and Benefits

The MAX6769TALD2+T is a single-chip, 6-channel voltage supervisor. It features a 4.8 ms minimum watchdog time-out period, programmable watchdog time-out from 4.8 ms to 1 mS and 250 ms system-level reset time. The device also features low power consumption, internal power shutdown capability, active-high or active-low reset outputs and accuracy of ±1.0% over the supply and temperature range. Additionally, the device is configured to generate a reset based on the power rail\'s over- and undervoltage, as well as its overcurrent, over- and undertemperature conditions.

Working Principle

The MAX6769TALD2+T is a combination of a voltage monitor and a watchdog timer. It monitors inputs from up to 6 voltage rails and triggers a reset based on any one of them exceeding preset alarm thresholds. The device will generate a watchdog reset if any of the monitored voltage rails are within its expected range, while a reset is not generated within the configured watchdog time-out period. The reset can be configured to be either active-high or active-low and is latched until cleared by an external reset signal. Additionally, the device can be configured to generate an interrupt signal, or a system-level reset, upon detecting any of the monitored power rail faults.

Conclusion

The MAX6769TALD2+T is a cost-effective voltage supervisor that monitors up to 6 power rails simultaneously and generates an active-high or active-low reset based on one of them exceeding pre-defined alarm thresholds. It features a watchdog timer, with a minimum time-out of 4.8 ms and a maximum of 1 ms, that can be used along with a reset controller to provide a total supervisory solution. The device is suitable for medium and low-end applications that require the supervision of power- and reset-functions.