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High-Precision Supervisory with Window Watchdog and Overvoltage Indicator

Highly Accurate Automotive Voltage Monitoring Supervisor with Windowed Watchdog in Small 2x2 TDFN

Product Details

The MAX16136, a low voltage, ±1% accurate window-detector supervisor circuit monitors a single system supply voltage and the integrity of code execution by a microprocessor or microcontroller. This device features an active-low, open-drain output that asserts whenever the monitored supply rail falls outside of the factory-trimmed undervoltage/overvoltage window threshold. The reset output remain asserted for the programmed reset timeout period after the monitored supply voltage falls within the undervoltage/overvoltage window threshold.

The MAX16136 offers factory-trimmed voltage thresholds from 0.5V to 5V in approximately 20mV increment. A variety of factory trimmed undervoltage/overvoltage thresholds from ±4% to ±11% are available to accommodate different supply voltages and tolerances.

A window-watchdog timer circuit monitors microprocessor or microcontroller activity. During normal operation, the microprocessor or microcontroller must repeatedly toggle the watchdog input (WDI) low within the fast watchdog timeout (tWD_F) and slow watchdog timeout (tWD_S). If the microcontroller or microprocessor does not toggle WDI within the window-timeout period, the supervisor asserts the watchdog output (active-low WDO) to signal that the system is not executing code as expected. The watchdog output pulse can be used to reset the microprocessor or micro controller, or it may be used to interrupt the system to warn of execution errors.

In addition, the MAX16136 features an overvoltage fault output (active-low OV) that latches low when the monitored rail exceeds the overvoltage threshold. The latched output can be cleared by pulling active-low CLR low.

The MAX16136 is available in a small, 2mm x 2mm, 8-pin TDFN side-wettable package and operates over the automotive temperature range of -40°C to +125°C.

Key Features

  • ±1% Accuracy
  • Enables ASIL Compliance at System Level
    • FMEDA Results Available Upon Request
  • 0.5V to 5V Threshold Range with 20mV Increments
  • ±4% to ±11% Undervoltage/Overvoltage Thresholds
  • Latched Overvoltage Fault Output
  • Clear Fault Input
  • 5μs Overvoltage Fault Delay
  • Window Watchdog Timeout
  • Factory-Set Reset Timeout
  • Open-Drain Reset Output
  • TDFN-8 Side-Wettable Package
  • -40°C to +125°C Operating Temperature Range

Applications/Uses

  • Advanced Driver-Assistance Systems (ADAS)
  • Automotive
  • Multivoltage ASICs
  • Servers
  • Storage Equipment
Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1
Reset Out Active Low
Open Drain
tRESET (min) Adjustable
Watchdog Feature Input/Output (WDI/WDO)
Windowed
Watchdog Timeout Adjustable
Supervisor Features Adjustable Reset Input
Latched Output
Overvoltage/Window Monitor
ICC (µA) (max) 35
Package/Pins TDFN-CU/8
Budgetary
Price (See Notes)
$1.19 @1k
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Simplified Block Diagram

MAX16136: Internal Block Diagram MAX16136: Internal Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

MAX16136 evaluation kit (EV kit) is fully tested and assembled circuit that demonstrates the capabilities of the MAX16136, a high-precision reset IC offering window-threshold and window-watchdog monitoring. The MAX16136 EV kit is designed to facilitate the evaluation of various features of the MAX16136 such as input overvoltage/ undervoltage faults, window-watchdog violation, and active-low OV latching/unlatching capability. The MAX16136 EV kit operates over the automotive temperature range.

The reset signal at active-low RST asserts low when the voltage at IN falls outside of the overvoltage/undervoltage windowthreshold settings. An overvoltage signal at active-low OV latches low to indicate overvoltage condition at IN and a watchdog output signal at active-low WDO pulses low when the signal period at WDI falls outside of the window-watchdog timing. The EV kit also features a push-button switch at active-low CLR to unlatch the overvoltage fault output (active-low OV). Two indicators, OV_STATUS LED and UV_STATUS LED, provide visual fault status at the input for overvoltage and undervoltage conditions.

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Features

  • 3.3V Nominal Input Threshold Voltage
  • ±4% Undervoltage/Overvoltage Thresholds with Respect to Nominal Input Threshold
  • 8ms(tWD_F)/80ms (tWD_S) Window-Watchdog Timeout
  • 10ms Reset Timeout for Active-Low RST signal
  • Reset LED Indicator
  • Overvoltage Fault LED Indicator
  • Clear Fault Input Push-Button Switch
  • -40°C to +125°C Operating Temperature Range
  • Proven 2-Layer 2oz Copper PCB Layout
  • Demonstrates Compact Solution Size
  • Fully Assembled and Tested

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    SIMULATION MODELS

    MAX16136 IBIS Model

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    Parameters

    Key Features

    • ±1% Accuracy
    • Enables ASIL Compliance at System Level
      • FMEDA Results Available Upon Request
    • 0.5V to 5V Threshold Range with 20mV Increments
    • ±4% to ±11% Undervoltage/Overvoltage Thresholds
    • Latched Overvoltage Fault Output
    • Clear Fault Input
    • 5μs Overvoltage Fault Delay
    • Window Watchdog Timeout
    • Factory-Set Reset Timeout
    • Open-Drain Reset Output
    • TDFN-8 Side-Wettable Package
    • -40°C to +125°C Operating Temperature Range

    Applications/Uses

    • Advanced Driver-Assistance Systems (ADAS)
    • Automotive
    • Multivoltage ASICs
    • Servers
    • Storage Equipment

    Description

    The MAX16136, a low voltage, ±1% accurate window-detector supervisor circuit monitors a single system supply voltage and the integrity of code execution by a microprocessor or microcontroller. This device features an active-low, open-drain output that asserts whenever the monitored supply rail falls outside of the factory-trimmed undervoltage/overvoltage window threshold. The reset output remain asserted for the programmed reset timeout period after the monitored supply voltage falls within the undervoltage/overvoltage window threshold.

    The MAX16136 offers factory-trimmed voltage thresholds from 0.5V to 5V in approximately 20mV increment. A variety of factory trimmed undervoltage/overvoltage thresholds from ±4% to ±11% are available to accommodate different supply voltages and tolerances.

    A window-watchdog timer circuit monitors microprocessor or microcontroller activity. During normal operation, the microprocessor or microcontroller must repeatedly toggle the watchdog input (WDI) low within the fast watchdog timeout (tWD_F) and slow watchdog timeout (tWD_S). If the microcontroller or microprocessor does not toggle WDI within the window-timeout period, the supervisor asserts the watchdog output (active-low WDO) to signal that the system is not executing code as expected. The watchdog output pulse can be used to reset the microprocessor or micro controller, or it may be used to interrupt the system to warn of execution errors.

    In addition, the MAX16136 features an overvoltage fault output (active-low OV) that latches low when the monitored rail exceeds the overvoltage threshold. The latched output can be cleared by pulling active-low CLR low.

    The MAX16136 is available in a small, 2mm x 2mm, 8-pin TDFN side-wettable package and operates over the automotive temperature range of -40°C to +125°C.

    Simplified Block Diagram

    MAX16136: Internal Block Diagram MAX16136: Internal Block Diagram Zoom icon

    Technical Docs

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal