EM6151- Windowed watchdog

Low Power Windowed Watchdog with Reset, Sleep Mode Functions - Ultra-Low Power

General Description

The EM6151 offers a high level of integration by combining voltage monitoring and software monitoring using a windowed watchdog. A comparator monitors the voltage applied at the VIN input comparing it with an internal voltage reference VREF. The power-on reset function is initialized after VIN reaches VREF and takes the reset output inactive after a delay TPOR depending on external resistance ROSC. The reset output goes active low when the VIN voltage is less than VREF. The RESET and EN outputs are guaranteed to be in a correct state for a regulated output voltage as low as 1.2 V. The watchdog function monitors software cycle time and execution. If software clears the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. The system enable output prevents critical control functions being activated until software has successfully cleared the watchdog three times. Such a security could be used to prevent motor controls being energized on repeated resets of a faulty system. When the microcontroller goes in stand-by mode or stops working, no signal is received on the TCL input of the EM6151 (version 55) and it goes into a stand-by mode in order to save power (CAN-bus sleep detector).


  • Automotive systems
  • Industrial
  • Home security systems
  • Telecom / Networking
  • Computers
  • Set top boxes

Resistor Calculation Tool
The excel file below helps to calculate the value of the external resistor ROSC for a given/wanted watchdog timeout period.


  • Low quiescent current 35 uA
  • -40°C to +125°C temperature range
  • Windowed watchdog with an adjustable time windows, guaranteeing a minimum time and a maximum time between software clearing of the watchdog
  • Time base accuracy ±8% (at 100ms)
  • Voltage reference accuracy ±3%
  • Sleep mode function (V55)
  • Adjustable threshold voltage using external resistors
  • Adjustable power on reset (POR) delay using one external resistor
  • Open-drain active-low RESET output
  • Reset output guaranteed for regulated output voltage down to 1.2 V
  • System ENABLE output offers added security
  • Qualified according to AEC-Q100 (PPAP)
  • Green SO-8 package (RoHS compliant)
Resistor Calculation Tool (170 KB)170 KB
Part numberStockMOQPrice
EM6151V50SO8B+Available2'500$1.36Order now
EM6151V53SO8B+Available on demand2'500$1.36Order now
EM6151V55SO8B+Available on demand2'500$1.36Order now
EM6151V30SO8A+Available on demand--Order now
EM6151V30SO8B+Available on demand--Order now
EM6151V50SO8A+Available on demand--Order now
EM6151V53SO8A+Available on demand--Order now

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