ADM693AARN

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Battery Backup Circuit
Number of Voltages Monitored:	1
Output:	Open Drain, Push-Pull
Reset:	Active High/Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	4.4V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	ADM693

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ADM693AARN Application Field and Working Principle

PMIC (Power Management Integrated Circuit) - Supervisors, as the name implies, is designed to manage the power required and generated within a system. One such device is the ADM693AARN. This is a two-channel, precision voltage monitor with reset which works within the range of 1.4V to 6V. While it offers a wide range of applications, the primary function of the ADM693AARN is to monitor supply voltage levels and reset the system if the voltage levels drop too low. This reset can either happen automatically or manually through the output of an active low open-drain. The device also includes an active-low chip enable that can be used to reduce the overall power consumption of the device.In addition to monitoring and resetting system voltage, the ADM693AARN also provides other important functions such as overvoltage protection and brown-out protection. The overvoltage protection feature allows the device to detect if the supply voltage is above a certain threshold and to shut down the system if this is detected. Similarly, the brown-out protection will detect if the voltage is too low and to shut down the system to prevent it from damage. Other useful features of the ADM693AARN are the internal temperature sensor and the low-supply current detection. The internal temperature sensor allows for temperature monitoring and for the device to respond to temperature conditions by resetting if the temperature becomes too high. The low-supply current detection enables the device to immediately detect when there is insufficient current from the power supply and take necessary steps to avoid damage. Because of its wide range of features and applications, the ADM693AARN is a popular choice for a variety of designs. As mentioned before, it can be used in systems that require overvoltage, brown-out and temperature protection. Furthermore, it can also be used in systems where precision voltage monitoring is required such as in critical embedded applications. The ADM693AARN is implemented in a small SOT23 package, which makes it ideal for space-constrained (such as handheld) designs. Its operating temperature range of -40°C to +85°C ensures that the device can be used in a wide range of temperature conditions without the need for a heatsink or other cooling elements. Furthermore, the operating voltage range of the device is wide enough to be used in other applications. Finally, the ADM693AARN has a low operating current of <1µA which helps to reduce overall power consumption. This, coupled with the internal temperature sensor and low current detection, makes the device an attractive choice for power-sensitive applications.The working principle of the ADM693AARN is relatively simple. The device compares the input voltage (VIN) with an internal reference voltage (VREF) and then compares the difference to a user-defined threshold. If the difference is greater than the threshold, the watchdog timer (WDT) is enabled. This timer will increment until the difference between the input voltage and the reference voltage is less than the user-defined threshold. If the timer reaches the timeout value, then the reset signal is issued. To summarize, the ADM693AARN is a two-channel, precision voltage monitor with reset which works within the range of 1.4V to 6V. It is a popular choice for a variety of designs such as those requiring overvoltage protection, brown-out protection or precision voltage monitoring. It is implemented in a small package and is power efficient. The device works by comparing the input voltage with an internal reference voltage, and issuing a reset signal if the difference is greater than a user-defined threshold.

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