UP Board is based on the Intel(R) Atom(TM) x5-Z83xx SoC (formerly Cherry Trail). It includes 2GB RAM, 16/32GB eMMC flash, 6 USB2.0 ports, 1 USB 3.0 OTG port, 1 Gigabit Ethernet, HDMI and DSI Graphics ports, RTC and a 40-pin I/O header. The form-factor for the board is based on the Raspberry Pi 2, and can be used with many of the add-on HAT boards designed for the Raspberry Pi 2.

Interface notes

PWM PWM frequency range is from 293 Hz to 6.4 MHz. 8-bit resolution is supported for duty-cycle adjustments, but this reduces for frequencies > 97.6kHz

I2C 2 I2C channels support standard-mode (100kHz) and fast-mode (400kHz). Bus frequency can be selected in BIOS settings. Note that, unlike Raspberry Pi, the I2C controller issues Repeated-START commands for combined transactions (e.g. a write-then-read transaction) which may not be supported by some I2C slave devices. For such devices, it is advisable to use separate write and read transactions to ensure that Repeated-STARTs are not issued.

SPI Bus frequencies up to 25MHz are supported, in steps which are less granular at higher speeds. E.g. Available speeds include: 25MHz, 12.5MHz, 8.33MHz, 6.25MHz, 5MHz, 4.167MHz, 3.571MHz, 3.125MHz, etc. Please be aware that speeds in between those steps will be rounded UP to the next nearest available speed, and capped at 25MHz. At the time of writing, only a single native chip-select is available (SPI CS0).

UART 2 high-speed UARTs are available, supporting baud rates up to support baud rates between 300 and 3686400. Hardware flow-control signals are not exposed, so software flow-control may be needed for rates above 115200. A console UART is also available but is not fully supported at this time.

Pin Mapping

The GPIO numbering in the following pin mapping is based on the Raspberry Pi model 2 and B+ numbering scheme.

Note that there is an enum to use wiringPi style numbers.