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Product description: RTC WatchDog HAT - overlay with High Precision RTC module for Raspberry Pi - Waveshare 20374
RTC WatchDog HAT overlay equipped with DS3231 chip - high precision real time clock. Compatible with Raspberry Pi series and Jetson Nano module. It has built-in MAX705 monitoring chip with auto reset function. Communicates over I2C bus. Allows you to read time in the form of hour, minute and second and date: month, day, year.
Product compatible with Raspberry Pi!
On the manufacturer's website you will find a product wiki page that makes it easy to get started with the overlay.
Contents of the RTC WatchDog HAT kit.
Arrangement of elements on the overlay.
Layout of components on the overlay
- USB type C power input
- MAX705 auto-reset monitor chip
- Watchdog output (1: on, 0: off)
- CR1220 battery socket
- Watchdog output warning (LED lights up if Watchdog is overflowing)
- Raspberry Pi 40PIN GPIO
- DS3231 high precision RTC chip
- Selectable Watchdog reset pins
- Control interface for use with other host boards
What is the RTC module used for?
RTC stands for Real-Time Clock and describes a real-time clock. RTC modules provide up-to-date date and time information - regardless of the operating state of the device, e.g. during current operation, lockout or shutdown. They also provide information when power is not supplied. They are used in simple watches and alarm clocks, and even in smart home control panels and measurement data loggers.
Description and pinout
- 3V3 - power supply pin 3,3 V
- 5V - power supply pin 5 V
- GND - system ground
- SDA - I2C bus data line
- SCL - I2C bus clock line
- D27 - RTC interrupt pin
- D22 - Watchdog overflow
- D4 - Watchdog RESET
- D23 / D18 / D17 - backup reset
Description and pinout.
Example of overlay connection with Raspberry Pi and Jetson Nano - modules to be purchased separately.
Technical specification RTC WatchDog HAT
- Type: overlay for Raspberry Pi and Jetson Nano
- Type: high precision RTC module
- Built-in chip: DS3231
- Automatic reset: yes (MAX705 chip)
- Communication interface: I2C bus
- Slot for battery: yes
- Battery type: CR1220 (not included)
- Module dimensions: 65 x 30.5 mm
Set contents
- RTC WatchDog HAT - overlay with RTC High Precision module - for Raspberry Pi - Waveshare 20374
- Header 2x20 - female
- Nylon spacers - 2 pcs.
- Screws for spacers - 5 pcs.
