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The temperature data is used for compensating the crystal and make the RTC more accurate.
![raspberry pi clock raspberry pi clock](https://1.bp.blogspot.com/-q78W_IAxB3c/Xh3fO321yXI/AAAAAAAAWeg/ruhzNHtOzu0BrB8fdFfsPbZXLe1Cfz8IwCKgBGAsYHg/w1200-h630-p-k-no-nu/IMG_20200109_182442.jpg)
The temperature sensor on Witty Pi 4 Mini has 0.125 ☌ resolution. By only turning on Raspberry Pi when necessary, the battery can be used way much longer with Witty Pi installed. Scheduling the ON/OFF sequence for Raspberry Pi is the most popular feature of Witty Pi, and it is extremely useful for systems that powered by battery. You can even define a schedule script to schedule complicated ON/OFF sequence for your Raspberry Pi. You can schedule the startup and/or shutdown of your Raspberry Pi, and make it a time-controlled device. As a result, your Raspberry Pi knows the correct time even without accessing the Internet. When your Raspberry Pi boots up, the time stored in the RTC will overwrite the system time. This makes the RTC very accurate and the actual annual error is limited within ☒ppm. The realtime clock (RTC) on Witty Pi 4 Mini has been calibrated in the factory and Witty Pi 4 Mini’s firmware also makes temperature compensation for the crystal. ACCURATE REALTIME CLOCK AND ON/OFF SCHEDULING Witty Pi 4 Mini has solder pads on the back, which allow you to solder a DC/DC converter (LDO or switching DC/DC converter) there. Witty Pi 4 Mini has very similar design with Witty Pi 4, however it doesn’t come with a DC/DC converter onboard, and it uses super capacitor for RTC time keeping when no power supply is connected. AVR 8-bit microcontroller (MCU) with 8 KB programmable flash.Dedicated temperature sensor with 0.125 ☌ resolution.
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Factory calibrated and temperature compensated realtime clock with ☒ppm accuracy.Witty Pi 4 Mini is the fourth generation of Witty Pi and it has these hardware resources onboard: It can define your Raspberry Pi’s ON/OFF sequence, and significantly reduce the energy usage. Witty Pi is an add-on board that adds realtime clock and power management to your Raspberry Pi. Witty Pi 4 Mini is an uHAT shaped add-on board that adds realtime clock and power management to your Raspberry Pi.
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