MAX16081XR29Q+T

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Power management integrated circuits (PMICs) are an increasingly important tool in many embedded systems. Their ability to regulate electrical power and to provide protection from short circuits and overvoltages, makes them an essential part of the system design. The MAX16081XR29Q+T is an example of a PMIC specifically designed for application fields requiring low quiescent current and high accuracy pertaining to the monitoring and reset functions.

The MAX16081XR29Q+T, classified as a PMIC - Supervisors, is a voltage monitoring IC, which is designed for use in, amongst other low power applications, battery operated appliances such as handheld instruments, medical devices and other electronic products. It can monitor a variety of applications, including microprocessors, microcontrollers, SRAM, and other power supply rails. For example, it can monitor single cell Li-ion battery charge and discharge current, or a 3.3V, 5V, and 9V power supply bus. The device can also function as an independent supervisor, monitoring processor activity and providing active reset on voltage or event detection.

The MAX16081XR29Q+T provides overvoltage and undervoltage protection, active voltage and reset monitors, watchdog timers, and comparators. It can be configured to work with a variety of devices and to initiate a reset based on user-defined criteria. It can also be used to detect power loss and then switch off power to avoid damage to the device or system.

The on-chip Comparator has two threshold settings-- one for the overvoltage condition and the other for the undervoltage condition. The Comparator works in response to an external voltage reference, which can be supplied from an external source or an internal reference. When the Comparator detects that the voltage level has exceeded or fallen below the specified limits, the result is used as a signal to activate either the Reset/Power switch or the Reset monitoring logic.

The Reset/Power switch allows the MAX16081XR29Q+T to control power-on and power-off cycles. This ensures that no device remains powered on if it senses an unsafe power condition. This control is also useful during system development or when controlling the power-on cycle of external components.

The MAX16081XR29Q+T also integrates a Reset monitor, which allows the IC to supervise the system for successful power-on reset and other monitoring functions. The Reset monitor can detect either a low impedance path at the RESET pin, or a discontinuity in the reset line. When triggered, the device will reset the microprocessor and halt execution until the reset conditions have been satisfied.

The MAX16081XR29Q+T also features two Watchdog timers. The first timer triggers a reset if the microprocessor fails to update the WDI signal within a specified period of time. The second timer can be used to periodically trigger a reset in order to prevent system lockup or improper functioning caused by software bugs or other unforeseen events.

The MAX16081XR29Q+T also includes an Event monitor that can detect an active signal coming from an external device such as a battery pack controller or temperature sensor. The Event monitor can be used to initiate a reset when the signal crosses a specific voltage threshold. This feature can be used to control the operation of other components or the system as a whole.

In summary, the MAX16081XR29Q+T is an excellent choice for applications such as handheld instruments and medical devices, where low quiescent current and high accuracy are priority. Its comprehensive selection of reset and voltage monitor functions provides the necessary system protection and reliability to ensure that the device will provide reliable operation over the full operating temperature range.

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