Avalue ECM-EHL3 3.5" SBCs with Intel Elkhart Lake, Three LAN Ports and Six Serial Ports

A line-side controller or gateway often has to sit on more than one network and still talk to a row of serial devices, from a small board and a DC supply. The Avalue ECM-EHL3 series is built around that job: a 3.5 inch SBC, also called a 3.5 inch motherboard, measuring 146 x 101 mm, with the Elkhart Lake processor soldered on the bottom layer and three LAN ports along the I/O edge.

Every ECM-EHL3 shares the same board. One 260-pin SO-DIMM socket takes up to 32 GB of DDR4-3200. Intel UHD Graphics drive two DP++ outputs to 4096 x 2160 at 60 Hz and a dual-channel 18/24-bit LVDS at 1920 x 1080, which switches to eDP 1.3 when needed, for up to three displays. I/O covers one 2.5GbE port on an Intel I226LM and two Gigabit Ethernet ports on Intel I210AT controllers, two USB 3.1 Gen2 and two USB 2.0 ports at the edge plus four USB 2.0 on headers, two RS-232/422/485 and four RS-232 ports, 8-bit GPIO and a Realtek ALC888S codec with a 3 W amplifier. An M.2 E key takes Wi-Fi, an M.2 B key with SIM slot takes WWAN plus GNSS or an SSD, an M.2 M key adds a PCIe x1 device and a SATA III port takes a drive. TPM 2.0 is on board.

The series differs only in processor, each with 1.5 MB cache. The ECM-EHL3-J6412-A1R carries a Celeron J6412 at up to 2.6 GHz, the ECM-EHL3-J6413-A1R a Celeron J6413 at up to 3.0 GHz, the ECM-EHL3-X13E-A1R an Atom x6413E at up to 3.0 GHz and the ECM-EHL3-X25RE-A1R an Atom x6425RE. The I/O is the same on all four builds, so a design can change processor without changing its cabling.

Power is 9 to 36 V DC with AT and ATX modes, AT by default. The boards operate from 0 to 60 °C with 0.5 m/s airflow, store from -40 to 75 °C and handle up to 95% humidity at 40 °C, non-condensing. A hardware watchdog and temperature and voltage monitoring are on board, the AMI BIOS sits on 256 Mbit SPI flash, and ACPI 5.0 power states S0, S3, S4 and S5 are supported. Each weighs 0.2 kg, supports Windows 10 and Linux, and carries CE and FCC Class B marks.