SR1CARU Integrated Circuits (ICs)

Series:	Smart Reset™
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Reset Timer
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	Adjustable/Selectable
Voltage - Threshold:	Adjustable/Selectable
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	6-UDFN
Supplier Device Package:	6-UDFN (1.45x1)

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Introduction

PMIC – Supervisors are used in embedded projects and they play an important role in power management and monitor power supply rail voltages. Their main function is to provide voltage monitoring, overvoltage and undervoltage protection, reset generation and window monitors.SR1CARU is a supervisor IC developed by On Semiconductor and it is designed for automotive applications. It monitors battery voltage, system voltages, and provides outputs for active reset and diagnostic feature. It is also capable of precision reset and active reset with configurable thresholds and delay.

Applications

SR1CARU is primarily used in automotive applications such as engine control, body control and powertrain systems. It is capable of monitoring input and output voltages from 3V to 24V, providing over and under voltage protection, window detection and reset generation.SR1CARU has a variety of features that make it suitable for automotive applications. It has a wide operating temperature range of -40 to +125 °C, allowing it to be used in environments where other supervisors may not be able to operate. It also has a low power consume of 1mA typical, which is essential for battery operated applications.It can also be used in isolated power supplies such as microcontrollers and buck switches. The supervisor is able to accurately detect voltages up to 4.25V without requiring calibration or resistor voltage dividers. The supervisor is also able to detect currents up to 1A and can shut down the system if the current is too high.

Working Principle

SR1CARU works by monitoring the input voltage to the system and providing an output for reset or diagnostic features when the input voltage is outside of the set threshold. The thresholds are set by the user and include hysteresis levels for reset accounts.The supervisor also contains an open drain output for reset, window monitor and voltage monitor functions, and an active reset delay that can be configured from 0.1 ms to 250 ms.The integrated diagnostic features allow for the detection of an open input voltage or shorted input voltage and can generate an output for responding to these events.The integrated window detection feature can be used to detect when the input voltage is outside of the user defined upper and lower limits and can be used to generate reset, shutdown or diagnostic outputs accordingly.

Conclusion

SR1CARU is an ideal supervisor IC for automotive applications due to its low power consumption, wide operating temperature range and advanced features. It provides over and under voltage protection, reset and window monitoring, allowing the system to be protected from any potential faults or errors. It is also capable of detecting open and shorted input voltages and can generate an output for responding to such events.

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