STM819LM6F Integrated Circuits (ICs)

PMIC - Supervisors:STM819LM6F application field and working principle

ST Microelectronics offers the STM819LM6F PMIC System Supervisor, which is used mainly in the automotive industry. The main applicationfield includes battery management, automotive networking, boosting, over-current protection and thermal management. The device provides a comprehensiveset of features that are needed to supply power to and control power in automotive electronics, optics, appliances and others.

Features of STM819LM6F

The STM819LM6F PMIC automotive system supervisor provides a high level of integrated features. These features include:

• Automatic Power-On Reset, Watchdog Reset, Brown-out (BOD), Lambda Timer and other delayed supply reset functions.
• Under-voltage Lockout (UVLO) provides protection against undesired operation during low power supply.
• Precision voltage monitoring of two supplies, with customized trip-points.
• Integrated MOSFET to control the main power switch.
• Output current monitor to detect over-current faults.
• Thermal protection with adjustable trip point and hysteresis.
• Flexible power sequencing.
• Integrated EMC filters.
• Programmable I2C interface.

Working Principle of STM819LM6F

The STM819LM6F PMIC system supervisor is based on an embedded 8-bit microcontroller and three main voltage regulators. The first regulator controlsthe supply voltage in order to power the microcontroller and the other elements. The second regulator monitors the supply voltage using a voltage Dividerand configurable hysteresis. The third regulator is used for controlling the main power switch. The microcontroller reads the external signals andperforms the different functions according to the settings.

The device allows the user to configure the settings of the power supply, Watchdog timer, under-voltage lockout and other functions. The settings arestored in a non-volatile memory. The device has an I2C interface, which can be used for reading and writing data.

The STM819LM6F PMIC system supervisor can run in two modes: the watch-dog timer mode or the slave mode. In watch-dog timer mode, the device isactivated when the power supply voltage rises to a certain level. If a failure condition occurs, the device will reset the system in order to preventdamage. In slave mode, the device is activated by an external signal.

Conclusion

The STM819LM6F PMIC System Supervisor is a powerful and versatile device. It is used mainly in the automotive industry where it provides an arrayof features and settings for power supply management and control. The device is based on an embedded 8-bit microcontroller, three main voltageregulators, an I2C interface and a non-volatile memory, which allow it to function in two modes - the watch-dog timer mode or the slave mode.

In conclusion, the STM819LM6F is a powerful and versatile device with a wide range of applications and features, which make it an ideal solutionfor automotive system supervisors.