Kontron K3851 ATX Motherboard User Manual

: June 15, 2024
: kontron

Kontron K3851 ATX Motherboard

Kontron K3851 ATX Motherboard

Safety Instructions / Important Notes

Do not connect or disconnect any cables or modules to or from any onboard connectors (including the the rear connectors for DC-IN and COM) until the motherboard is completely powered down.

Any damage caused to the motherboard by misuse of the onboard connectors is excluded from the standard warranty. Kontron cannot be held liable for any damage that results from incorrect use of any onboard connectors.

The system integrator is fully responsible for the usage of appropriate connectors and cables to fulfill the technical requirements (electrical contact, durability, power/current levels, signal integrity etc.)

Risk of Explosion if battery is replaced by an incorrect type
Dispose of used batteries according to the instructions

Technical data are subject to change without prior notice. Kontron accepts no responsibility with regards to technical or editorial mistakes or omissions.

Feature Overview

Motherboard Versions

Feature| K3841-Q| K3842-Q| K3843-B| K3851-R| Notes
---|---|---|---|---|---
Industrial Series| √| | | √|
Extended Lifecycle Series (XLC)| | √| √| |
Form Factor| µATX| µATX| µATX| ATX|
Operating Temperature| -10°C…+60°C| +10°C …+50°C| -10°C …+60°C| Motherboard Ambient Temperature
Chipset (PCH)| Q670E| Q670| B600| R680E| Incl. PCH heatsink
CPU TDP| Max. 125W|
Memory Support| 4 x DDR5 4800, Dual Channel, max. 128GB| Effective speed: up to 4400 @1DPC up to 4000 @2DPC
ECC Support| —| —| —| √|
Graphics Support| 4 x DisplayPort V1.4a| all ports support DP++
HDMI / DVI / eDP / LVDS| —| HDMI/DVI via DPP dongle
Support for D3653 VGA converter board| —| (√)| Only K3851-R PCIe slot #4
LAN1: i219LM| √| 1.0 GbE
Intel Standard Manageability| √| √| —| √|
LAN2/LAN3: i225LM| √/√| (√) / —| –/–| √/√| 2.5 GbE
TSN / TCC Support| (√)| —| —| (√)| Validation planned
WoL / LAN Teaming| √ / √| √ / (√)| √ / —| √ / √|
Slot #1| PCIe x16 Gen5| PEG slot, close to CPU Max. load: 75W
Bifurcation Support| (√)*| —| √| PCIe x16 or 2 x PCIe x8
Slot #2| PCIe x1 Gen3, open| PCIe x1 Gen3, closed| PCIe x1 Gen3, open| Max. load: 10W / 25W
Slot #3| PCIe x16 @4 lanes, Gen4| PCIe x16 @1 lane, Gen4| PCIe x16 @4 lanes, Gen4| Max. load: 75W
Slot #4| PCIe x1 Gen3, closed| PCIe x8 @4 lanes, Gen3, closed| Max. load: 10W (µATX) Max. load: 25W (ATX)
Slot #5| n.a.| PCIe x8 @4 lanes, Gen4, open| Max. load: 25W
Slot #6| n.a.| PCIe x1 Gen3, open| Max. load: 10W / 25W
Slot #7| n.a.| PCI 32Bit 33MHz, Rev. 2.3| Max. load: 25W

) Requires upcoming HW revision K384x Rev.02xx ) 10W: Card length ≤ 168mm / 25W: Card length ≥ 178mm
) Additional LAN2 on K3842-Q2 only

Feature| K3841-Q| K3842-Q| K3843-B| K3851-R| Notes
---|---|---|---|---|---
SATA 6G / SATA RAID|

4 Ports / √

| RAID 0/1/5 (VMD)
First M.2 Key-M Socket| PCIe Gen4 2230/2242/2280| PCIe Gen4 2280| PCIe Gen4 2230/2242/2280| Attached to CPU
Second M.2 Key-M Socket| PCIe Gen4 2230/2242/2280| PCIe Gen4 2280| PCIe Gen4 2230/2242/2280| Attached to PCH
NVME RAID| √| —| √| RAID 0/1/5 (VMD)
Intel Optane Support| √| “Pyramid Glacier” (H20)
M.2 2230 Key-E Socket for WLAN/BT| √| —| √| Incl. CNVi Support
M.2 Key-B Socket| —|
Rear USB 2.0| —| 2| —| Type A Port (black)
Rear USB 3.2 Gen1| 4| 2| 4| Type A Port (blue)
Rear USB 3.2 Gen2| 2| 2| 2| Type A Port (red)
Rear USB 3.2 Gen2| 1| —| 1| Type C Port
Internal USB 2.0| 2| = 1 x Header @ 2 Ports
Internal USB 3.2 Gen1| 2| = 1 x Header @ 2 Ports
Internal Stick Socket| √| —| √| USB 2.0 (black)
2nd Internal Stick Socket| √| —| √| USB 3.2 Gen2 (red)
Integrated iTPM V2.0 / TPM (SPI) Header| √ / √| √ /–| √ / √| Header for Infineon (TCG approval)
Supported Fans| 4| 2| 4| 4 Pin PWM
Error LED Support| √| —| √| Fan or Temperature Error
HW Watchdog| √ | —| √ | System Reset after Timeout
GPIO Port| √| —| √| 8 Bit
External COM1| √| RS-232
Internal COM2/COM3/COM4| √ / √ / √| — / — / —| √ / √ / √| RS-232****
RS-422/RS-485 Support| —|
PS2 Port / Parallel Port| √ / —| — /–| √ / —| PS/2: Keyboard and Mouse supported
Chassis Intrusion Support| √|
Buzzer / SPDIF Support| √ / √| √ /–| √ / √| Digital Output
SCSI LED Header| √| —| √|
VRM Heatsink (2x)| √| —| √| CPU Voltage Regulator

**) Requires BIOS > R1.1.0 *) requires upcoming HW revision 02xx
**) Full featured COM port (COM3+4 only) requires upcoming HW revision 02xx

Basic Layout & Connectors

K384x (µATX)

Feature Overview

Note: Picture shows full configuration; detailed stuffing depends on specific motherboard version. See feature overview on previous pages for details.

K3851 (ATX)

Onboard Components

K384x (µATX)

xxx = optional component
(depends on motherboard version)

K3851 (ATX)

Rear I/O Connectors

Feature Overview

I/O Shield

Nominal insertion force: ~ 75 N for specified ATX IO “letterbox”
Note: ATX Chassis “letterbox” for I/O shield:
Nom. size = 158.75 x 44.45mm
Tolerance = +/- 0.2mm

M.2 Installation Notes

M.2 Key-M sockets:
Supports PCIe x4 (Gen4) for NVME SSD modules
Mechanical support for 2230, 2242, and 2280 modules (K3843-B: 2280 only!). SATA mode is not supported!

M.2 Key-E socket:
Supports PCIe x1 and USB 2.0 for WLAN and Bluetooth modules
Mechanical support for 2230 modules.
CNVi modules supported!

Important Note:
Recommended torque for M.2 screw is 0.2Nm, and 0.3Nm for the nut.
Max. torque must never be exceeded, otherwise the motherboard (solder nuts) may be damaged. Damaged solder nuts are not covered by any warranty!

Feature Overview

Interfaces & Connectors

Board

Front Panel Connector

Pin	Signal	Pin	Signal
1	HD-LED + 1)	2	Power LED + 1)
3	HD-LED – 2)	4	Power LED – 2)
5	GND	`6`	Power_Button
7	Reset_Button	`8`	GND
9	reserved	X	Key
11	reserved	12	GND
13	BMC Alert LED + 3)	14	GND
15	reserved	16	reserved
17	Speaker +	18	BIOS Test mode (reserved)
19	GND	20	reserved
X	Key	22	reserved / Recover BIOS –
23	Speaker –	24	Recover BIOS +

Constant current output (13mA)
Switched signal (GND)
Constant current output (13mA) if BMC alert is active.

Power LED:
Anode: Pin 2 – current source 13mA up to 4V
Cathode: Pin 4 (suitable for various LED colors)

HDD LED:
Anode: Pin 1 – current source 13mA up to 4V
Cathode: Pin 3 (suitable for various LED colors)

BMC Alert LED
Anode: Pin 13 – current source 13mA up to 4V
Cathode: any GND (e.g. Pin 14)

Speaker Output:
Mono; typ. 0.5W at 8 Ohm load

Note:
System beeps are only audible via the onboard buzzer.
Interfaces & Connectors

Note : Pinning is compatible to Intel 10 pin header

System Monitoring

Temperature Sensors and Fans
SystemGuard: Fan / Temperature Monitor

Temperature Sensors and Fan Connectors

System Monitoring

All fans:
2A continuous / 4A peak current
Do not attach more than one fan per connector!
Remove or connect fans only when unit is powered off!

SystemGuard – Monitoring Tool

MS Windows-based System Monitoring Tool

Visualize temperature sensor data
Display current speed for attached fans
Display current voltage data and CPU power data
User can configure fan aging control (menu “Special”)
SystemGuard provides warnings if a fan or sensor fails
User can configure system watchdog (menu “Special”)
User can enable “full fan speed”

FTP-Link SystemGuard

Power Supply

“ATX” Multirail Power Supply Connector

Pin	Signal	Pin	Signal
13	+ 3.3V	1	+ 3.3V
14	– 12V	2	+ 3.3V
15	GND	3	GND
16	PS_ON (low asserted)	4	+ 5V
17	GND	5	GND
18	GND	6	+ 5V
19	GND	7	GND
20	– 5V (not used)	8	PWR_OK (high asserted)
21	+ 5V	9	+ 5V Aux*
22	+ 5V	10	+ 12V
23	+ 5V	11	+ 12V
24	GND	12	+ 3.3V

Minimum power supply load = 0A
*On some PSU models the 5V aux voltage does not drops off for several minutes after PSU main is switched off. “Power Failure Recovery” feature only works, after the 5V aux voltage drops down to 0V!

Internal Power Supply Connector (12V for Processor)

Pin	Signal	Pin	Signal
4	GND	8	+12V
3	7
2	6
1	5

Minimum power supply load = 0A

Power Supply Requirements

Source| Voltage| Min. PSU Load| Max.Voltage Tolerance| Motherboard Capacitive Load| *Motherboard max. Current (continuous) )
---|---|---|---|---|---
Main Power Supply| + 12V| 0A| ± 5 %| 2.500µF| 26A )
– 12V| 0A| ± 10 %| —| 0.3A
+ 5V| 0A| ± 5 %| 1.900µF| 6.0A
+ 3.3V| 0A| ± 5 %| 1.100µF| 0.5A
Aux. Power| + 5Vaux| 0A| ± 5 %| 1.900µF| 2.5A

*) Max. motherboard input current incl. processor and DRAM memory

Note: Additional power for drives, USB devices, PCIe cards etc. is not included!)

**) Processor 125W TDP: Max. cont. current = 26A; max. surge current = 39A (< 10ms)
Processor 65W TDP: Max. cont. current = 23A; max. surge current = 34A (< 10ms)
Processor 35W TDP: Max. cont. current = 11A; max. surge current = 19A (< 10ms)

Power consumption can be reduced by limiting PL1 / PL2 CPU settings (BIOS setup option) See section Miscellaneous / Processor TDP Setting for details

Display Options

Video Output Options

All DisplayPort outputs are compatible with DP++

DPP to HDMI (passive / active)
DPP to DVI (passive / active)
DPP to VGA (active)

Maximum common screen resolution	Number of simultaneous displays
8k @ 60Hz HDR or 5k @ 120Hz HDR	1
8k @ 60Hz SDR or 5k @ 60Hz HDR	2
4k @ 60Hz HDR	4

All DPP output ports are equivalent
SDR = Standard-Dynamic-Range-Video

HDR = High Dynamic Range Video

Note: Intel Genlock feature is not supported
Display Options

Display output order

Multimonitor output in GOP driver is enabled. Therefore screen output in BIOS and UEFI shell, as well boot logo during system boot is shown at two displays simultaneous (clone view). Depending on which Display Ports are used, only two displays are selected, as shown in the following table. Lowest “Priority” wins, if more than two monitors are connected.

Priority	1	2	3	4	5	6
Primary display	DPP1	DPP1	DPP1	DPP2	DPP2	DPP3
Secondary display	DPP2	DPP3	DPP4	DPP3	DPP4	DPP4

Miscellaneous

Various LED states / Error Status Messages

The power indicator (Power LED, Front panel pin 2/4) shows the various operating modes and error states of the system:

Status	Description
LED off	The system is switched off or unpowered
LED on	The system is in operation
LED flashes steady (50 % on, 50 % off)	The system is in sleep mode
LED flashes 2x short, repeated after pause	There is a fault in the CPU power

supply, the CPU or the BIOS
LED flashes 4x short, 1x long, 4x short – repeated after pause| Failure in Power Supply

The BMC alert LED (Front panel pin 13) shows System Monitoring alert events.

Status	Description
LED off	No Alert event – Fan and temperature sensor values are in their

defined range.
LED on| There is an alert event. Please check for failed fans or overheated temperature sensor.
*Reset alert via SystemGuard or by rebooting the system after solving the issue.

The EC status LED (EC0) shows the current system state.

Status	Description
LED off	System is powerless or in deep sleep (G3, S4, S5)
LED on	System is running (S0)
LED flashes steady (50 % on, 50 % off)	System is ready for power-on (S3, S4*,

S5*)

*) Depending on the power settings of BIOS ,LED is off or blinking in S4 or S5 power state. If any wake-up source or USB standby power is enabled, motherboard will not enter “deep sleep” and therefore is able to blink the LED.

Note: Sleep states (G3, S0, S3, S4, S5) as defined in ACPI: https://uefi.org/specs/ACPI/6.4/16_Waking_and_Sleeping/sleeping-states.html

About Kontron

Kontron is a global leader in IoT/Embedded Computing Technology (ECT). Kontron offers individual solutions in the areas of Internet of Things (IoT) and Industry 4.0 through a combined portfolio of hardware, software and services. With its standard and customized products based on highly reliable state-of- the-art technologies, Kontron provides secure and innovative applications for a wide variety of industries. As a result, customers benefit from accelerated time-to-market, lower total cost of ownership, extended product life cycles and the best fully integrated applications.

For more information, please visit: www.kontron.com

Global Headquarters

Kontron Europe GmbH

Gutenbergstraße 2
85737 Ismaning, Germany
Tel.: + 49 821 4086 0
Fax: + 821 4086 111
pcmb-sales@kontron.com

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