This is an open-source USB real-time clock for the Raspberry Pi, allowing your project to maintain accurate time and alarm/alert functions without internet connectivity – regardless of power cycles and reboots.

It uses a DS3231 RTC chip which runs the USB RTC with extremely high efficiency and accuracy. The RTC has cross-platform support which enables it to be used on different platforms such as Windows, MAC and more.

The USB connectivity is handled via an MCP2221 which is a USB-to-UART/I2C serial converter. The battery holder accepts a CR1220 battery.

Features

• Temperature-compensated crystal oscillator
• DS3231 advanced processor
• MCP2221 USB-to-UART I2C serial converter
• I2C/SMBus supported clock and data lines
• Supports full-speed USB (12 Mb/s)
• 64-byte Transmit
• 64-byte Receive
• USB 2.0 Compliant
• Low-Power Consumption

Resources

• Product Wiki
• GitHub

Specifications

• Battery Backup Input for continuous timekeeping
• Operating temperature ranges: Commercial: 0C to +70C / Industrial: -40C to +85C
• Low power consumption
• Real-time clock counts seconds, minutes, hours, day, date, month and year (with leap year compensation valid up to 2100)
• Two time-of-day alarms

Package Contents

• 1 x USB RTC Module

Raspberry Pi & CR1220 battery not included