MAX6328XR22+T

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Power Management Integrated Circuits (PMICs) play a crucial role in the management of available power in any given application. The MAX6328XR22+T is a PMIC Supervisors IC, designed for use in supervisory parameter detection, reset, and power management applications. This article answers some key questions about the MAX6328XR22+T and its application fields and working principle.

Application Field

The MAX6328XR22+T is optimized for automotive, industrial, and consumer markets, thanks to its 20V operating supply voltage, -40°C to 85°C operating temperature range, and UP and SSOP package options. It is designed to monitor one or two power sources against three adjustable trip thresholds. The part has an internal watchdog timer, dual independent accurate reset timers and two active-low reset outputs.

This means that the MAX6328XR22+T is not just an integrated solution for field-programmable microcontrollers, but can be used as an independent solution for microprocessor systems which already contain an internal reset timer.

The MAX6328XR22+T has a wide range of features:

• 3 Adjustable Trip Thresholds and 3 Reset Signals
• Low power and high accuracy reset with ON-state RESET1/RESET2
• Wide supply voltage and temperature range
• Minimal external components
• Stable fixed reset thresholds
• UP and SSOP package options
• Integrated watchdog timer
• SPI and I²C options

The MAX6328XR22+T provides a one-stop solution for supervisory parameter detection, reset, and power management, allowing designers to reduce their related design costs, PCB space, and time codes. The part can be used, for example, in appliances, consumer electronics, consumer products, HVAC/R, telecom, and industrial applications.

Working Principle

The MAX6328XR22+T features 3 adjustable trip thresholds (VCC1, 2 and 3) and 3 reset outputs (RESET1, 2 and 3). Depending on the source of power or voltage, the thresholds VCC1 and 2 can monitor one or two power supplies. VCC3 monitors a single voltage as a reference point.

The MAX6328XR22+T also contains an integrated watchdog timer. The microcontroller monitors the input level of the WATCHDOG signal. The microcontroller can reset the microprocessor if the WATCHDOG signal remains low after a defined period of time (overflow of the watchdog timer).

The MAX6328XR22+T also has two independent, accurate reset timers. When the preset period set by the RESET signal has been reached, the microcontroller generates a signal (RESET1 or RESET2) to reset the processor. The RESET signal is then complemented with a CMOS/TTL output (active low) for reset assurance.

The MAX6328XR22+T has 2 programmable 0.71V to 2.62V power-on reset (POR) pins (VCC1, VCC2). The POR pin can also be used as a power supply monitor/monitor input. The POR pin will generate a reset signal if the voltage used to power the microcontroller drops below the set threshold.

The MAX6328XR22+T has an SPI or I²C interface for programming the trip thresholds, reset parameters, and reset timer for each of the 3 reset outputs. It also features an active-high manual reset input (MR), which forces RESET1 and RESET2 outputs to a low level and ensures that the processor/microcontroller is reset. The part also has a wide operating temperature range from -40°C to 85°C.

Conclusion

The MAX6328XR22+T is a PMIC Supervisors IC optimized for automotive, industrial, and consumer markets. It is designed to monitor one or two power sources against three adjustable trip thresholds, and has an internal watchdog timer, dual independent accurate reset timers, and two active-low reset outputs. The MAX6328XR22+T has a wide range of features and is suitable for a variety of applications. Its SPI or I²C interface allow for programming of the trip thresholds, reset parameters and reset timer for each of the three reset outputs. The MAX6328XR22+T provides a one-stop solution for supervisory parameter detection, reset, and power management.

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