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Two/Three Input Automotive Voltage Monitor with Watchdog

Industry's Only Auto-Qualified, ASIL-D Power-System Monitor with Challenge/Response Watchdog

Product Details

Key Features

Parametric specs for Supervisors (2 Monitored Voltages)
Reset Thresh. (V) 0.5 to 3.6875
Reset Thresh. Accur. (%) (@ +25°C) 1
Reset Out Open Drain
Interface Factory Fixed
tRESET (min) Adjustable
Watchdog Feature Input (WDI)
Watchdog Timeout 1s to 2s
Supervisor Features Overvoltage/Window Monitor
Package/Pins TDFN-CU/10
Parametric specs for Supervisors (3 Monitored Voltages)
Reset Thresh. (V) 0.5 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1
Reset Out Open Drain
Interface Factory Fixed
tRESET (min) Adjustable
Watchdog Feature Input (WDI)
Watchdog Timeout 1s to 2s
Supervisor Features Overvoltage/Window Monitor
Package/Pins TDFN-CU/10
Budgetary
Price (See Notes)
0.53
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (2 Monitored Voltages)
Reset Thresh. (V) 0.5 to 3.6875
Reset Thresh. Accur. (%) (@ +25°C) 1
Reset Out Open Drain
Interface Factory Fixed
tRESET (min) Adjustable
Watchdog Feature Input (WDI)
Watchdog Timeout 1s to 2s
Supervisor Features Overvoltage/Window Monitor
Package/Pins TDFN-CU/10
Parametric specs for Supervisors (3 Monitored Voltages)
Reset Thresh. (V) 0.5 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1
Reset Out Open Drain
Interface Factory Fixed
tRESET (min) Adjustable
Watchdog Feature Input (WDI)
Watchdog Timeout 1s to 2s
Supervisor Features Overvoltage/Window Monitor
Package/Pins TDFN-CU/10
Budgetary
Price (See Notes)
0.53

Key Features

  • Small Solution
    • 2.35V to 5.50V Operating Supply Voltage
    • Only One External Component Required
    • 125µA Operating Current
  • High Precision
    • Selectable 102.5% to 110% OV Monitors
    • Selectable 97.5% to 90% UV Monitors
    • ±0.8% Accuracy
    • 0.5% Step Size
    • ASIL-D Compliance
  • Highly Integrated
    • MAX20478A - Two Voltage Monitoring Inputs
    • MAX20478B - Three Voltage Monitoring Inputs
    • Windowed Watchdog
    • OTP Configuration with Error-Correcting Code
    • Programmable RESET1 and RESET2 Pins
  • 10-Pin Side-Wettable TDFN with Exposed Pad (3mm x 3mm)
  • AEC-Q100 Qualified
  • -40°C to +125°C Operating Temperature

Applications/Uses

  • Advanced Driver-Assistance Systems
  • Autonomous Driving Processing Systems
  • Power System Supervision and Microcontroller Unit/System-on-a-Chip Monitoring
  • Remote Sensor Modules

Description

The MAX20478 is a complete ASIL-D-compliant System-on-a-Chip (SoC) voltage monitor with two or three voltage monitor inputs. Inputs 1 and 2 can be configured to monitor a voltage between 0.5V and 3.6875V in 12.5mV steps, while input 3 can be configured to monitor a voltage between 0.5V to 5.6V in 20mV steps. Each input has programmable OV/UV thresholds of between 2.5% and 10% with ±0.8% accuracy. The MAX20478 also contains a programmable windowed watchdog.

The MAX20478 significantly reduces system size and component count, while improving reliability, compared to separate ICs or discrete components. The device is designed to operate over the ambient temperature range of -40°C to +125°C.

Simplified Block Diagram

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 .