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K3931-N mITX

Connector/Socket Diagram

Technical Details

FEATURES

Chipset / SoC (APU)

DPP / HDMI / LVDS / eDP

Stereo Audio / 5.1 Multichannel Audio / Front Panel Audio

Buzzer / int. Speaker Support (stereo)2

GbE LAN / Dual GbE LAN / 2.5GbE LAN

WoL / PXE / LAN Teaming / TSN

SATA / SATA RAID / M.2 (SATA) / M.2 (PCIe/NVME)

USB 2.0 / USB 3.2 (Gen1) / USB 3.2 (Gen2) / USB 3.2 (Gen2) Type-C

FAN monitored & controlled CPU / AUX1 / AUX2

TEMP monitored CPU / onboard sensors / external sensor

Intel® Alderlake-N SoC

+ / - / + / +

+ / 01 / +

+ / +

+ / - / +

+ / + / + / +

+ / - / + / +

+ / + / + / 03

+ / + / -

+ / + / -

SPECIAL FEATURES

COM interface support for RS-232 / RS-485 / RS-422

Silent Fan / System Guard

Recovery BIOS / Flash Update / Multi Boot

HDD Password / EraseDisk / TPM V2.0 onboard / optional TPM module

BIOS POST- / BIOS Boot- / OS- HW Watchdog

Operating Mode 24-7 / 8-5 (hrs per day - days per week)

Motherboard operating temperature range (chassis inside)4

+

+ / +

+ / + / +

+ / + / + / -

+ / + / +

+ / -

0 °C ... +60 °C

INTERNAL CONNECTORS

SO DIMM Sockets (DDR5 4800)

PCI Express® x4: 1 lanes, Gen3 / Mini-PCIe

SATA-III / M.2 Key-M SSD / M.2 Key-B

M.2 2230 (Key-E for WLAN/Bluetooth)

Front Panel Audio (9-Pin, HD Audio) / S-PDIF Out (Digital Audio)

USB 2.0 pin header (2 port) / USB 2.0 single port header / USB Stick socket5

USB 3.2 Gen1 pin header (2 ports)6 / USB 3.2 Gen2 Key A header3

Serial COM header / CCTalk header / Parallel Port header

LVDS / LVDS Backlight / Embedded DisplayPort @ 4 lanes

FAN PSU / CPU (PWM) / AUX1 (PWM)

Intrusion (Case Open) / GPIO (8 Bit) / SMBus

Stereo Speaker header / Digital Mic header

Front Panel (Power Switch, Reset Switch, LEDs, Intel 10 pin header)

SATA Drive Power Connector (5 V/12 V) / DC-In Connector 8-34 V (4 pin)

1

1 / -

1 / 1 / 1

1

1 / 1

1 / 1 / 1

1 / 1

2 / 1 / -

1 / 1 / 1

- / 1 / 1

1 / 1 / 1

1 / -

1

1 / 1

EXTERNAL CONNECTORS

DisplayPort V1.4 / HDMI / DVI / VGA

Audio Mic. In / Line in / Line out (or driver configuration)

LAN (RJ-45) / PS/2 Keyboard / Mouse

USB 2.0 / USB 3.2 Gen1 / USB 3.2 Gen2

DC-In connector (external input) 8-34 V @ 10 A max.; lockable

Serial COM interface7

3 / - / - / -

- / 1 / 1

2 / - / -

0 / 2 / 2

1

2

1) Multichannel audio only via S/PDIF or DPP

2) Stereo speaker support; 2 W @4Ω

3) Type-C available via Adapter Cable

4) Forced cooling required for high operating temperature range. See TechNotes document for details

5) USB 2.0

6) USB3 connector includes separate USB 2.0 signal pins (2 channels)

7) RS-232; Thereof one port (COM2) supporting RS-232/RS-422/RS-485

K3931‐N Mini‐ITX (2023‐06‐06)

Footer

3

Overview Rev2 –

CURRENT DESIGN

DC‐In

lockable

DPP1           DPP2

DPP3 (shared /w LVDS)

2x USB 3.2

Gen1

2x USB 3.2

Gen2

COM1 (RS232)

COM2 

(RS232/RS422/485)

LAN2

(Intel 2.5G)

LAN1

(Realtek 1G)

Audio 

(LineIn, LineOut)

Optional: USB‐C 

3.2 Gen2

M.2 Key‐M 2230/2242/2280

PCIe x2@G3,  SSD NVMe

M.2 Key‐B 2242/2280

PCIe x1@G3,  SSD SATA

M.2 Key‐E 

2230

WiFi CNVi, 

BT USB

DC‐In 8‐34V

External / Internal

1x SODIMM

DDR5

4800 MHz

Intel Alderlake‐N

SoC 6‐15W

FAN1

Config Jumper

SATA

1x USB 2.0

LVDS Backlight

24bit LVDS

Panel Voltage

EDP

LVDS

Intrusion

Speaker

PCIe x1@G3 (open x4 slot)

Buzzer

CR2032

RTC Battery

USB 3.2 

Gen2 Key‐A

Preliminary Layout

K3931 Rev.2

6‐layer PCB

Preliminary Layout

K3931 Rev.2

6‐layer PCB

170 mm

170 mm

Bild 

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