XC6122D325MR-G

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Watchdog Circuit
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	100 ms Typical
Voltage - Threshold:	2.5V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	SOT-25

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Introduction

The XC6122D325MR-G application field and working principle is dedicated to the protection, monitoring and supervision of the processor’s power supply system and other supply systems, providing several protection and circuit features that enable the processor to operate safely in a variety of applications. On account of system complexity, certain of the funtions offered by the XC6122D325MR-G require additional features to permit adequate protection of the processor by controlling and monitoring the power supply. The supervisor also ensures that power up and power down operations occur in a predetermined sequence in order to guarantee proper line operation.Finally, the supervisor also prevents latch-up in case of accidental improper power supply transition.

Power-Up/Power-Down Sequences

During power down, the XC6122D325MR-G contains a reset circuit that keeps the processor in reset mode until the power supply has settled to the proper voltage. Once the voltage drops to a predetermined level, the processor is held in reset mode until the power supply settles to the correct level. The supervisor also ensures that power up and power down operations occur in a predetermined sequence in order to guarantee proper line operation. The sequence of power up or power down can be adjusted by setting the hold-off time. This feature is useful in two ways: first, it provides necessary reset protection and second, it helps to prevent power supply latch up in case of accidental voltage fluctuations.

Under-Voltage Detection and Protection

The XC6122D325MR-G supervisor is built with under-voltage protection which trips when the voltage on the power supply drops below a predetermined level. It has two trip thresholds, one for the processor (2.2 V) and one for system (1.8V). This is beneficial because it prevents damage to the processor since the voltage rises gradually when power is applied.The supervisor can also be used to detect and protect against overvoltage conditions. This is accomplished by monitoring a reference voltage from the power supply and comparing it to user-programmed thresholds. In the case of an over-voltage condition, the supervisor will shut off the output voltage or, if programmable, switch off the output switching circuit and place the device in reset mode.

Oscillation Protection

The XC6122D325MR-G also contains oscillation protection, which is useful when interfacing oscillator with the output stages. In the event of an oscillator-induced voltage spike, the supervisor monitors the output voltage level and can detect and shuts off the output voltage in extreme cases. The supervisor includes two independent oscillator detectors where one is used to detect the rise and the other is used to detect the fall. The detection thresholds are configurable so that the user can adjust the sensitivity of the oscillation protection to meet their application requirements.

Ouput Current Limiting and Over-Temperature Protection

The XC6122D325MR-G supervisor can detect and limit the output current through the supply lines. The current limit pin allows the user to configure the current limit level. This ensures to load-current levels can be driven that does not exceed this current and hence prevents the supply voltage from dropping below the specified voltage levels. Additionally, the XC6122D325MR-G supports over-temperature protection to ensure that the temperature remains within specified tolerance levels and to protect the processor from damage caused by excessive temperatures. This feature can be used to detect and protect against overtemperature failures and can also be used to shut down the circuit in the event of an overtemperature condition.

Watchdog Timer

Finally, the XC6122D325MR-G also includes a watchdog timer which monitors the processor’s activity and trips an output to reset the processor if no activity is detected within a certain period of time. This is an important feature as it helps prevent lockups and allows the processor to continue running after a system hang-up.Conclusion

In conclusion, the XC6122D325MR-G provides several features to ensure safe and reliable operation of the processor. These features include a reset circuit, under-voltage protection, over voltage protection, oscillation protection, output current limiting, overtemperature protection and a watchdog timer. All of these features contribute to the reliable operation of the processor and allows it to function safely in a variety of applications.

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