Universal System Voltage Supervisor (SVS) - Voltage Monitors

In order to protect batteries and systems in mobile systems from low voltages, it is advisable to use a "System Voltage Supervisor" (SVS or voltage monitor). This small circuit was developed on the basis of the MIC8114 and contains some useful additions for connecting the peripherals and the system to be monitored.

The following operating parameters and functions are to be specified:

  • Input voltage 7-60V
  • Microchip/Micrel MIC8114 is based
  • minimum 790ms RESET
  • Trip level adjustable with potentiometer (for UVP)
  • output either /RESET (push-pull logic level 3V) or /RESET as open drain with pull-up to 3V, 5V or external up to 50V
  • Output isolated via Optomos NO/NC, either both or NO up to 60V via IXYS CPC2317N
  • Manual reset input with ESD / TVS
  • 5V 10mA AUX output with fuse
  • Reverse polarity protection with fuse
  • Overvoltage protection at VIN
  • LED indicator and ext. LED connector
  • Either 2.54mm pin / socket or screw terminals
  • easy to assemble by hand in 0805
  • 40x35mm

The PCBs are easy to assemble by hand and can be simply integrated into the system via screw terminals. Alternatively, standard 2.54mm pin headers can be mounted. Due to the minimum RESET time of 790ms, the MIC8114 is a good alternative to the common TPS380X (TPS3801) as used by various Class-D amplifier circuits around the TPA3251 and TPA3255. Furthermore, the chip is less prone to unwanted triggering via the manual reset input.

Circuit diagram

MIC8114 SVS Schematic Rev 0.2

Hardware Revision 0.1

MIC8114 SVS PCB Top

MIC8114 SVS PCB Top

MIC8114 SVS PCB Bottom

MIC8114 SVS PCB Bottom

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