Waveshare RTC WatchDog HAT for Raspberry Pi
Waveshare RTC WatchDog HAT for Raspberry Pi - Image 2
SKU: SBCD-1408
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Waveshare RTC WatchDog HAT for Raspberry Pi

₹1,429.00 (Inclusive of all taxes)
Out of Stock

The Waveshare RTC WatchDog HAT for Raspberry Pi integrates a MAX705 monitoring circuit with auto-reset capabilities and a high-precision DS3231SN Real-Time Clock, complete with a backup battery holder.

This HAT ensures system stability through its watchdog functionality and provides accurate timekeeping for your Raspberry Pi projects.

Features

  • Integrates MAX705 monitoring circuit for reliable auto-reset functionality.
  • Features a DS3231SN high-precision Real-Time Clock with a CR1220 backup battery holder.
  • Offers configurable watchdog reset pin selection for flexible system control.
  • Provides an indicator for watchdog output warnings, enhancing operational visibility.

Out of stock

Description

The Waveshare RTC WatchDog HAT is specifically designed to enhance the reliability and timekeeping accuracy of your Raspberry Pi. This HAT incorporates a MAX705 monitoring circuit, providing essential watchdog functionality to automatically reset the Raspberry Pi in case of system unresponsiveness, ensuring continuous operation for critical applications.

Beyond its robust watchdog capabilities, the HAT features a high-precision DS3231 Real-Time Clock (RTC) chip. This integrated RTC maintains accurate time and date, even when the Raspberry Pi is powered off, thanks to its dedicated CR1220 backup battery holder. This is crucial for applications requiring precise timestamping or scheduled events without relying on network time servers.

The board also includes convenient features like watchdog output warning indicators, configurable reset pin selection, and standard Raspberry Pi 40PIN GPIO compatibility, making it a versatile and dependable add-on for a wide range of embedded projects.

Key Features

  • Integrated MAX705 monitoring circuit provides automatic system reset functionality.
  • High-precision DS3231SN Real-Time Clock (RTC) chip ensures accurate timekeeping.
  • Includes a dedicated CR1220 battery holder for continuous RTC operation without main power.
  • Configurable reset pin selection allows flexible integration with Raspberry Pi or other host boards.
  • Features an indicator light for watchdog output warnings, signaling potential system issues.
  • Standard Raspberry Pi 40PIN GPIO header for direct compatibility.

Applications

  • Industrial automation and control systems requiring robust uptime.
  • Data logging systems where accurate timestamps are critical regardless of power cycles.
  • Remote monitoring solutions needing reliable system recovery.
  • IoT edge devices requiring scheduled tasks and system stability.
  • Embedded projects that benefit from independent timekeeping and hardware-level reset.

Technical Specifications

CompatibilityRaspberry Pi Series (40-PIN GPIO)
HAT TypeRTC & Watchdog HAT
Watchdog ChipMAX705
RTC ChipDS3231SN
RTC BatteryCR1220 (not included)
Operating Voltage Range (Watchdog)1V to 5.5V
Supply Current (Watchdog)150 µA
Reset Threshold Voltage4.50V to 4.75V
Watchdog Timeout Period1V to 2.25V
WDI Input Current50 µA
Supply Voltage (DS3231)2.3V to 5.5V
Active Supply Current (DS3231)200 µA @ 3.3V; 300 µA @ 5.5V
RTC Output Frequency32.768 kHz
SCL Clock Frequency100 kHz

Frequently Asked Questions

How does the watchdog function work on this HAT?

The MAX705 monitoring circuit on the HAT continuously monitors the Raspberry Pi. If the system becomes unresponsive for a configurable period, the watchdog circuit triggers a hardware reset, forcing the Pi to reboot. This ensures high system availability, preventing prolonged downtime in critical embedded applications.

What type of battery is required for the RTC, and is it included?

The HAT requires a CR1220 button cell battery to power the DS3231SN Real-Time Clock chip. This battery is not included in the package. The CR1220 ensures the RTC maintains accurate time and date even when the Raspberry Pi's main power supply is disconnected for extended periods.

Is this HAT compatible with all Raspberry Pi models?

Yes, the Waveshare RTC WatchDog HAT is compatible with Raspberry Pi models featuring the standard 40-PIN GPIO header, including Raspberry Pi 2B/3B/3B+/4B, and Zero series. It integrates seamlessly by connecting directly to these GPIO pins for power and I2C communication with the RTC.

What is the purpose of the watchdog output warning indicator?

The watchdog output warning indicator, typically an LED, illuminates if the watchdog timer overflows, signifying that the Raspberry Pi system has become unresponsive and a reset event is pending or has occurred. This visual cue helps in debugging and understanding system stability.

Package Includes

  • 1x Waveshare RTC WatchDog HAT for Raspberry Pi

Additional Information

Weight 0.02 kg
Dimensions 7.5 × 6 × 1 cm

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