DS1238-5+ Datasheet/PDFPower management integrated circuit (PMIC) supervisors usually provide supply/battery management, reset and protection functions to enable stable supply operation and lower cost design. The DS1238-5+ is a supervisory IC with versatile features, providing a low system cost solution for power supply monitors, microprocessor systems, power supply startups and fault thresholds.
Application Field of DS1238-5+
DS1238-5+ can be used in applications where intelligent control of power on/off and inrush current is required. For example, memory systems, dual processor systems, hard drives, and UPS. It is also suitable for systems that need to be protected from overvoltages, as well as power supply sequencing controllers.
Features of DS1238-5+
DS1238-5+ provides important features to simplify system design. First, it integrates both the power-on reset, and the power-off reset functions into one circuit, thus saving considerable PCB space. Second, it supports both active-low and active-high reset, allowing for use in a wide variety of system hardware designs, and third, its low-voltage, dual-voltage, and high-voltage voltage level monitoring features combined with open-drain reset output make it suitable for complex applications.
Working Principle of DS1238-5+
DS1238-5+ is a power supervisory control IC employed to monitor and control voltage and power-in. The main function of the IC is to check the input power line and output power line voltages, and to generate a reset signal when power supply voltage falls below a set level. The reset signal is available through a dedicated open-drain output and an active-low/high selectable reset output.
The power and reset function of the IC can also be configured using external components. In order to prevent false resetting due to load transients or excessive inrush currents, adjustable circuit protection features are provided. The bleeder resistors can be adjusted through two resistive voltage divider resistors to maintain the reset trip point within acceptable voltage range. Pins such as WDI, W DO, WD2, and RESET are connected to the microprocessor to enable enhanced system control.
Conclusion
The DS1238-5+ is an versatile power monitoring IC which is suitable for complex systems requiring power on/off reset, and voltage protection. This supervisory IC with its adjustable protection features provides a low cost solution for power supply monitoring, microprocessor systems, power supply startups, and fault thresholding.