RTC Watchdog HAT expansion board (B)

TheRTC Watchdog HAT (B) expansion board is a multifunctional, compact module for the Raspberry Pi platform that combines real-time clock (RTC) and watchdog function with automatic reset. This module is designed for the Raspberry Pi series boards with high-precision RTC and Watchdog HAT, which helps to ensure stable operation of your Raspberry Pi, especially in mission-critical applications where high reliability and accurate time control are required.

Main features of the module:

• Built-in monitoring circuitry with automatic reset function;
• Built-in high-precision clock chip (DS3231SN) to provide accurate time control;
• Supports I2C communication and a programmable 16-bit self increment counter;
• Has a standard connector for Raspberry Pi, Jetson Nano series boards;
• Built-in watchdog status indicator to warn of watchdog timeout.

Specifications:

• Communication Interface: I2C;
• Real time clock RTC: DS3231;
• Watchdog chip: CH32V003;
• Power supply: 5В;
• Connector: 40PIN GPIO;
• Dimensions: 30.5 mm x 65.0 mm;
• Fixed hole diameter: 3.0 mm.

Board overview:

1. USB Type-C power input.

2. CH32V003 watchdog timer

3. CR1220 RTC battery holder

• RTC battery, supports CR1220 button cell

4. Watchdog status indicator

• Blinks rapidly at 100ms when the watchdog timer is full
• After the watchdog timer is full and executes the reset command, it will flash at 500ms if it is detected that the host is not powered off
• Lights up when the watchdog function is enabled
• Off when the watchdog function is disabled

5. Power indicator
6. Raspberry Pi 40PIN GPIO connector

• for connection to Raspberry Pi

7. RTC chip

• DS3231 high precision RTC chip

8. Selecting a PIN for reset
9. Management interface for use with other host boards

Board dimensions: 65.0 mm x 30.5 mm

Wiki: http://www.waveshare.com/wiki/RTC_WatchDog_HAT_(B)

Weight: 0.028 kg

Scope of delivery:

1. WatchDog RTC(B) expansion card x1;
2. 2×20PIN socket x1;
3. Standoffs package x1.