STM818MDS6E

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The STM818MDS6E is a System Standard Supervisors Low-Voltage Detector (SVS-LVD) from STMicroelectronics. It is designed to provide low-voltage protection and monitoring of 3.3V and 5V systems. Its integrated voltage detection circuitry allows the user to monitor system voltages with the ability to initiate a reset signal when a voltage is outside of a pre-defined range. The SVS-LVD can be used in both industrial and automotive applications, providing reliable and robust system protection.

Application Field

The STM818MDS6E is suitable for a variety of applications including automotive, industrial, and consumer electronics. Its features make it ideal for providing system protection and resetting controller ICs in the event of a fault.

In automotive applications, the SVS-LVD can be used to monitor and protect sensors, motors, and system circuit boards. The unit provides protection against over-voltage and under-voltage conditions as well as resetting the controller IC in the event of system failure. It can also be used to protect low-voltage automotive systems such as airbag systems and fuel pumps.

In industrial applications, the SVS-LVD can be used to monitor and protect industrial process control and automation systems. The unit provides protection against over-voltage, under-voltage, and over-current conditions. By allowing the system to reset itself in the event of a fault, it improves system reliability and helps to reduce downtime. It can also be used to protect low-voltage DC/DC converters.

In consumer electronics applications, the SVS-LVD can be used to monitor and protect digital cameras, video game consoles, PDAs, and portable media players. The unit provides protection against over-voltage, under-voltage, and over-current conditions. By allowing the system to reset itself in the event of a fault, it helps ensure reliability and improves product life span. It can also be used to protect against power line transients.

Working Principle

The STM818MDS6E consists of two major parts: the SLL (Supervisor Low-Voltage Detector) and the SSC (Superior System Clock). The SLL detects a voltage lower than the rated threshold and sends a low voltage indication signal to the SSC. The SSC uses this signal to initiate a reset signal, thus effectively resetting the controller ICs within the system.

The SLL utilizes a proprietary hysteretic comparator. This comparator continually monitors the voltage on the SLL input pin and compares it against a set threshold. If the input voltage falls below the set threshold, the comparator will trip and send a low voltage indication signal to the SSC.

The SSC utilizes a clock detector circuit. This circuit monitors the system clock and detects when it is not operating correctly. If an incorrect system clock is detected, the SSC will initiate a reset signal. This reset signal is then used to reset the controller ICs which have become unstable as a result of the incorrect system clock.

The SVS-LVD also features a power-on reset circuit. This circuit monitors the system power supply and initiates a reset if it falls below a set level. The reset signal is then used to reset the controller ICs which have become unstable as a result of the power supply failure.

In summary, the STM818MDS6E is a low-voltage System Standard Supervisors device which provides over-voltage, under-voltage and over-current protection. It also provides power-on and system reset functionality which allows it to reset controller ICs in the event of system faults. It is suitable for a variety of automotive, industrial and consumer electronic applications and provides reliable and robust system protection.

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