MAX6702LKA+T

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The MAX6702LKA+T, often abbreviated as MAX6702, is a voltage and temperature supervisor IC used in various applications ranging from general retail electronics and telecommunications equipment to medical, automotive, and industrial products. It is part of the voltage supervisor product family from Maxim Integrated and uses a combination of solid-state monitoring and CMOS technology to reliably monitor and adjust power supply for many designs. These devices are ideal for regulating voltage and temperature in applications that require high accuracy and flexibility. This article will discuss the application field and working principle of Maxim Integrated\'s MAX6702LKA+T.

Application Field

The MAX6702LKA+T is a supervisory device that combines both voltage and temperature sensing in one device. It provides two separate output pins to signal when the input voltage or temperature exceeds user-defined thresholds. The main application of this device is to monitor a range of voltages (e.g., system power supply, battery voltage) and temperatures (e.g., die temperature, ambient temperature) to ensure that the voltages and temperatures remain in safe levels for system operation. The MAX6702LKA+T can also be used in communications systems, as it can detect an “out-of-range” signal from an off-site unit, enabling a system to take action to protect circuit boards or other components.

In addition to these applications, the device has also been tested and approved in military and aerospace applications, since it can also perform other functions such as burst-mode operation, power-up/power-down reset, and temperature-based reset.

Working Principle

The MAX6702LKA+T functions by constantly monitoring the input voltage and comparing it with the preset thresholds for over-voltage and under-voltage detection (OV and UV). When the input voltage exceeds the preset level, the device generates alert signals on the OV output pin. Similarly, when the input voltage falls below the set level, the device generates signals on the UV output pin. The preset OV and UV threshold values can be programmed by external resistors.

The device also contains a temperature sensor that functions in much the same way as the voltage sensor. The temperature sensor\'s thresholds can also be preset by a pair of external resistors. The device monitors the temperature and raises an alert signal when the temperature exceeds the preset level. The alert signal is either a "tristate" output sign or an interrupt to the microprocessor.

In addition to the voltage and temperature monitoring, the MAX6702LKA+T also functions as a watchdog timer. It contains a timer that is set to a given value. The device generates a "tristate" or "reset" signal when the timer reaches the preset value. The watchdog timer can be used to monitor system activity to ensure that the system does not stay idle for too long.

Finally, the MAX6702LKA+T contains a Power-On Reset (POR) circuit. The POR circuit monitors the power-supply voltage, and when the voltage drops to a certain level, it raises a reset signal. This allows the device to reset the system when it detects any inconsistencies in the power-supply voltage.

Conclusion

The MAX6702LKA+T is a voltage and temperature supervisor IC used in various applications to reliably monitor and adjust power supply for many designs. It offers two output pins to signal when the input voltage or temperature exceeds user-defined thresholds. The device also contains a temperature sensor, a watchdog timer, and a power-on reset (POR) circuit. These features make the MAX6702LKA+T ideal for various applications, ranging from general retail electronics, telecommunications equipment, to medical, automotive, and industrial products.

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