MAX6872ETJ+

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MAX6872ETJ+ is a precision monitoring and reset IC from Maxim Integrated. This device is a member of the MAX68xx family of voltage supervisors. It is designed for high precision monitoring of power management systems using low-expensive ion-sensitive field effect transistor (ISFET) technology. In addition to its superb performance specifications, the MAX6872ETJ+ is an ideal solution for system monitoring applications that require ultra-low quiescent current and energy harvesting sources.

The MAX6872ETJ+ is a voltage monitoring IC with a 2.6V (± 0.1V) voltage threshold and a ± 1% accuracy over temperature. It provides user programmable reset timeout delay and reset assertion delay. A unique power source pin allows monitoring and resetting of a supply voltage level below the microcontroller’s power source voltage. This can be useful for monitoring various power rail voltages or battery backupvoltages in applications such as automotive and portable electronics. It can be used as a complementary monitoring solution with existing power-on reset ICs to ensure system reliability during startup and after power restart events.

The MAX6872ETJ+ has two reset output pins. The RESET2 pin is used for an early indication of a voltage drop below a user-defined level and the RESET1 pin is used to internally control resetting circuitry which is applied when the voltage drops below the reset threshold. The RESET2 and RESET1 outputs can be used independently. For example, the RESET2 output can be used to activate an optional external poweron reset IC while the RESET1 output can be used to reset the host microcontroller.

The MAX6872ETJ+ features an ISFET-based voltage monitoring input with a selectable threshold between 1.4V and 3.1V. A differential amplifier and an internal temperature sensor are used to provide the user with temperature compensated threshold detection with ± 1% accuracy over temperature. The device also features a programmable reset timeout delay, allowing for a flexible reset sequence. This can be used to differentiate between power cycling events, power from an external backup supply, and power from the main supply.

The MAX6872ETJ+ has a wide range of applications, including automotive, industrial, and consumer electronics. It can be used to provide power monitoring and resetting solutions in applications such as system power\'s monitoring, automotive powertrain systems, and portable electronic devices. Additionally, the device can be used to monitor and reset systems powered by energy harvesting sources such as solar panels, batteries, and vibration energy.

The working principle of the MAX6872ETJ+ is based upon a unique ISFET intrinsic sensing resistor voltage divider circuit. The device senses the voltage between the SETIN pin (with an offset of 0.5V higher than the common node voltage) and the VDD pin. The sensed voltage is then compared to the device’s threshold. If the sensed voltage is lower than the threshold, the device will assert the RESET1 pin, resetting the system. The reset timeout delay can be used to ensure that the system is reset only after the voltage has been below the threshold for a certain amount of time.

In conclusion, the MAX6872ETJ+ is a advanced voltage monitoring and reset IC from Maxim Integrated. It combines precision monitoring of power management systems with low-cost ISFET technology and programmable reset timeout delays. This makes it an ideal choice for an array of applications, ranging from automotive, industrial, and consumer electronics. Because of its low quiescent current and power source pin, it is an ideal solution for system monitoring applications that require energy harvesting sources.

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