AXIOMTEK PICO840 User manual

PICO840/842
Intel®AtomTM E3845/E3827
Intel®Celeron®J1900/N2807
Processors Pico-ITX Board
User’s Manual

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Disclaimers
This manual has been carefully checked and believed to contain accurate information.
Axiomtek Co., Ltd. assumes no responsibility for any infringements of patents or any third
party’s rights, and any liability arising from such use.
Axiomtek does not warrant or assume any legal liability or responsibility for the accuracy,
completeness or usefulness of any information in this document. Axiomtek does not make any
commitment to update the information in this manual.
Axiomtek reserves the right to change or revise this document and/or product at any time
without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of Axiomtek Co., Ltd.
CAUTION
If you replace wrong batteries, it causes the danger of explosion. It is recommended by the
manufacturer that you follow the manufacturer’s instructions to only replace the same or
equivalent type of battery, and dispose of used ones.
Copyright 2015 Axiomtek Co., Ltd.
All Rights Reserved
September 2015, Version A2
Printed in Taiwan

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ESD Precautions
Computer boards have integrated circuits sensitive to static electricity. To prevent chipsets
from electrostatic discharge damage, please take care of the following jobs with precautions:
Do not remove boards or integrated circuits from their anti-static packaging until you are
ready to install them.
Before holding the board or integrated circuit, touch an unpainted portion of the system
unit chassis for a few seconds. It discharges static electricity from your body.
Wear a wrist-grounding strap, available from most electronic component stores, when
handling boards and components.
Trademarks Acknowledgments
Axiomtek is a trademark of Axiomtek Co., Ltd.
Windows®is a trademark of Microsoft Corporation.
AMI is a trademark of American Megatrend Inc.
IBM, PC/AT, PS/2, VGA are trademarks of International Business Machines Corporation.
Intel®and Pentium®are trademarks of Intel Corporation.
Other brand names and trademarks are the properties and registered brands of their
respective owners.

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Table of Contents
Disclaimers.....................................................................................................ii
ESD Precautions...........................................................................................iii
Chapter 1 Introduction............................................. 1
1.1 Features...............................................................................................2
1.2 Specifications......................................................................................2
1.3 Utilities Supported ..............................................................................3
Chapter 2 Board and Pin Assignments.................... 5
2.1 Board Dimensions and Fixing Holes.................................................5
2.2 Board Layout.......................................................................................7
2.3 Assembly Drawing..............................................................................9
2.4 Jumper and Switch Settings ............................................................12
2.4.1 LVDS Voltage Selection (JP1 and JP2) .................................................... 13
2.4.2 LVDS Brightness Control Mode Setting (JP4) .......................................... 13
2.4.3 Restore BIOS Optimal Defaults (JP5)....................................................... 13
2.4.4 Auto Power On (SW1)............................................................................... 13
2.5 Connectors ........................................................................................14
2.5.1 VGA Connector (CN1)............................................................................... 15
2.5.2 HDMI Connector (CN2)............................................................................. 15
2.5.3 DC Power Jack w/ Screw (CN3) ............................................................... 15
2.5.4 SMBus Connector (CN4) .......................................................................... 16
2.5.5 LVDS Connector (CN6)............................................................................. 16
2.5.6 Power LED Header (CN7)......................................................................... 18
2.5.7 SATAPower Connector (CN8).................................................................. 18
2.5.8 External Speaker and Internal Buzzer Header (CN9)............................... 18
2.5.9 Inverter Connector (CN10)........................................................................ 18
2.5.10 Fan Power Connector (CN11)................................................................... 19
2.5.11 Board to Board Connectors (CN12 and CN13)......................................... 19
2.5.12 Ethernet Port (LAN1)................................................................................. 20
2.5.13 SATA Connector (SATA1).......................................................................... 20
2.5.14 CMOS Battery Connector (BAT1)............................................................. 21
2.5.15 Full-size PCI-Express Mini Card and mSATA Connector (SCN1)............. 21
Chapter 3 I/O Board................................................ 23
3.1 AX93283 Specifications....................................................................23
3.2 AX93283 Dimensions and Fixing Holes ..........................................23

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3.3 AX93283 Board Layout.....................................................................24
3.4 AX93283 Jumper Settings ................................................................25
3.4.1 COM1 Data/Power Selection (JP1 and JP2) ............................................ 25
3.5 AX93283 Connectors, Switches and LED .......................................26
3.5.1 System Reset Switch (CN1)...................................................................... 26
3.5.2 Audio Jack (CN2)...................................................................................... 26
3.5.3 COM1 Connector (CN3)............................................................................ 27
3.5.4 COM2 Connector (CN4)............................................................................ 27
3.5.5 System Power Switch (CN5)..................................................................... 27
3.5.6 Board to Board Connectors (CN9 and CN10)........................................... 28
3.5.7 USB Connectors (USB1 and USB2)......................................................... 29
3.5.8 Power and HDD LED Indicator (D1) ......................................................... 29
Chapter 4 Hardware Description ........................... 31
4.1 Microprocessors ...............................................................................31
4.2 BIOS ...................................................................................................31
4.3 System Memory.................................................................................31
4.4 I/O Port Address Map........................................................................32
4.5 Interrupt Controller (IRQ) Map .........................................................33
4.6 Memory Map ......................................................................................36
Chapter 5 AMI BIOS Setup Utility .......................... 37
5.1 Starting...............................................................................................37
5.2 Navigation Keys ................................................................................37
5.3 Main Menu..........................................................................................39
5.4 Advanced Menu.................................................................................40
5.5 Chipset Menu.....................................................................................52
5.6 Security Menu....................................................................................55
5.7 Boot Menu..........................................................................................56
5.8 Save & Exit Menu ..............................................................................57
Appendix A Watchdog Timer................................... 59
A.1 About Watchdog Timer.....................................................................59
A.2 How to Use Watchdog Timer............................................................59
A.3 Sample Program................................................................................60
Appendix B BIOS Flash Utility ................................ 63

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PICO840/842 Pico-ITX Board
Introduction 1
Chapter 1
Introduction
The PICO840 is a Pico-ITX board with Intel®AtomTM E3845/E3827 processors. Meanwhile
PICO842, a 3.5’board, supports Intel®Celeron®J1900/N2807 processors. Both of them
deliver outstanding system performance through high-bandwidth interfaces, multiple I/O
functions for interactive applications and various embedded computing solutions.
The PICO840/842 have one 204-pin unbuffered SO-DIMM socket for DDR3L 1333/1066MHz
SO-DIMM memory, maximum memory capacity up to 8GB. It also features one Gigabit/Fast
Ethernet, one SATA port with transfer rates up to 3Gb/s, four USB 2.0 high speed compliant,
and built-in high definition audio codec that can achieve the best stability and reliability for
industrial applications. Additionally, it provides you with unique embedded features, such as
two serial ports in RS-232/422/485 and Pico-ITX form factor that applies an extensive array of
PC peripherals. The board can be enhanced by its built-in watchdog timer function, a special
industrial feature not commonly seen on other motherboards.

PICO840/842 Pico-ITX Board
2 Introduction
1.1 Features
PICO840 - Intel®AtomTM quad core E3845 (1.91GHz) and dual core E3827 (1.75GHz)
PICO842 - Intel®Celeron®quad core J1900 (2GHz) and dual core N2807 (1.58GHz)
1 DDR3L SO-DIMM supports up to 8GB memory capacity
4 USB 2.0 ports
2 COM ports
+12V only DC-in
1 PCI-Express Mini Card w/ mSATA supported
1.2 Specifications
CPU
PICO840
- Intel®AtomTM quad core E3845 1.91GHz.
- Intel®AtomTM dual core E3827 1.75GHz.
PICO842
- Intel®Celeron®quad core J1900 2GHz.
- Intel®Celeron®dual core N2807 1.58GHz
Thermal Solution
Fanless but with reserved fan connector.
Operating Temperature
PICO840: -40°C~70°C
PICO842: -20°C~70°C.
BIOS
American Megatrends Inc. UEFI (Unified Extensible Firmware Interface) BIOS.
16Mbit SPI Flash, DMI, Plug and Play.
PXE Ethernet Boot ROM.
System Memory
One 204-pin unbuffered DDR3L SO-DIMM socket.
Maximum up to 8GB DDR3L 1333/1066MHz memory.
Onboard Multi I/O
Controller: Fintek F81803U.
Serial Ports: Two ports for RS-232/422/485.
Serial ATA
One SATA-300 connector.
mSATA supported (Optional)
USB Interface
Four USB ports with fuse protection and complies with USB Spec. Rev. 2.0.
Display
A standard 15-pin D-Sub VGA connector which is co-layout with a HDMI connector.
One 2x20-pin connector for 18/24-bit single/dual channel LVDS and one 8-pin
inverter connector. LVDS resolution is up to 1920x1200 in 24-bit dual channel.

PICO840/842 Pico-ITX Board
Introduction 3
Trusted Platform Module (TPM)
Controller: ST ST33TPM12LPC via LPC bus interface.
Complies with TPM1.2 main and PC client specification.
Watchdog Timer
1~255 seconds or minutes; up to 255 levels.
Ethernet
One port with Intel®i210IT for Gigabit/Fast Ethernet.
One RJ-45 connector.
Audio
HD audio compliant with Realtek ALC662.
MIC-in and line-out.
Expansion Interface
One full-size PCI-Express Mini Card socket complies with PCI-Express Mini Card
Spec. V1.2.
Power Input
DC power jack connector, co-layout with 1x2-pin right angle connector.
+12V only DC-in.
AT auto power on function supported.
Power Management
ACPI (Advanced Configuration and Power Interface).
Form Factor
Pico-ITX form factor.
Note
All specifications and images are subject to change without notice.
1.3 Utilities Supported
Chipset and graphics driver
Ethernet driver (i210IT)
Audio driver
Trusted Execution Engine
Sideband Fabric Device

PICO840/842 Pico-ITX Board
4 Introduction
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PICO840/842 Pico-ITX Board
Board and Pin Assignments 5
Chapter 2
Board and Pin Assignments
2.1 Board Dimensions and Fixing Holes
Top View

PICO840/842 Pico-ITX Board
6 Board and Pin Assignments
Bottom View
Side View

PICO840/842 Pico-ITX Board
Board and Pin Assignments 7
2.2 Board Layout
Top View
Side View

PICO840/842 Pico-ITX Board
8 Board and Pin Assignments
SSODIMM1
SCN1
Bottom View

PICO840/842 Pico-ITX Board
Board and Pin Assignments 9
2.3 Assembly Drawing
Heatsink for PICO840/842 (see image below):
First of all, use the following four screws to secure heatsink on heatspreader.
x4

PICO840/842 Pico-ITX Board
10 Board and Pin Assignments
For thermal dissipation, a heatspreader enables the PICO840/842’s components to dissipate
heat efficiently. Images below illustrate how to install the heat spreader.
Installing Heatspreader
The PICO840/842 has four assembly holes for installing heatspreader plate. Align and firmly
secure the heatspreader plate to the PICO840/842. Be careful not to over-tighten the screws.
x4 x4 x4

PICO840/842 Pico-ITX Board
Board and Pin Assignments 11
Installing Heatspreader and AX93283 I/O Board
Gently insert I/O board into CN12 and CN13. Align and firmly secure the heatspreader plate
and I/O board to PICO840/842. Be careful not to over-tighten the screws. See chapter 3 for
more details of AX93283 I/O board.
x4 x2 x2 x4

PICO840/842 Pico-ITX Board
12 Board and Pin Assignments
2.4 Jumper and Switch Settings
Jumper is a small component consisting of jumper clip and jumper pins. Install jumper clip on 2
jumper pins to close. And remove jumper clip from 2 jumper pins to open. Below illustration
shows how to set up jumper.
Properly configure jumper and switch settings on the PICO840/842 to meet your application
purpose. Below you can find a summary table of jumpers, switch and onboard default settings.
Note
Once the default jumper or switch setting needs to be changed, please do it under
power-off condition.
Jumper and Switch
Description
Setting
JP1
LVDS +12V Voltage Selection
Default: N/A
1-2 Open
JP2
LVDS +3.3V/+5V Voltage Selection
Default: +3.3V
1-2 Close
JP4
LVDS Brightness Control Mode Setting
Default: PWM Mode
1-2 Close
JP5
Restore BIOS Optimal Defaults
Default: Normal Operation
1-2 Close
SW1
Auto Power On
Default: Disable
1-2 Close

PICO840/842 Pico-ITX Board
Board and Pin Assignments 13
2.4.1 LVDS Voltage Selection (JP1 and JP2)
The board supports voltage selection for flat panel displays. Use these jumpers to set
LVDS connector (CN6) pin 1~6 VCCM to +3.3V, +5V or +12V. To prevent hardware
damage, before connecting please make sure that input voltage of flat panel is correct.
JP1
JP2
2.4.2 LVDS Brightness Control Mode Setting (JP4)
The JP4 enables you to select PWM or voltage control mode for inverter connector
(CN10). These two control modes are for adjusting the brightness of LVDS panel.
2.4.3 Restore BIOS Optimal Defaults (JP5)
Put jumper clip to pin 2-3 for a few seconds then move it back to pin 1-2. Doing this
procedure can restore BIOS optimal defaults.
2.4.4 Auto Power On (SW1)
If SW1 is enabled for power input, the system will be automatically power on without
pressing soft power button. If SW1 is disabled for power input, it is necessary to
manually press soft power button to power on the system.
Function
JP1 Setting
+12V level
Close
N/A
Open
Function
JP2 Setting
+3.3V level (Default)
1-2 close
+5V level
2-3 close
Function
Setting
PWM mode (Default)
1-2 close
Voltage mode
3-4 close
Function
Setting
Normal (Default)
1-2 close
Restore BIOS optimal defaults
2-3 close
Function
Setting
Disable auto power on (Default)
1-2 close
Enable auto power on
2-3 close

PICO840/842 Pico-ITX Board
14 Board and Pin Assignments
2.5 Connectors
Signals go to other parts of the system through connectors. Loose or improper connection
might cause problems, please make sure all connectors are properly and firmly connected.
Here is a summary table which shows all connectors on the hardware.
Connector
Description
CN1
VGA Connector
CN2
HDMI Connector
CN3
DC Power Jack w/ Screw
CN4
SMBus Connector
CN6
LVDS Connector
CN7
Power LED Header
CN8
SATA Power Connector
CN9
External Speaker and Internal Buzzer Header
CN10
Inverter Connector
CN11
Fan Power Connector
CN12
40-pin Board to Board Connector
CN13
20-pin Board to Board Connector
LAN1
Ethernet Port
SATA1
SATA Connector
BAT1
CMOS Battery Connector
SCN1
Full-size PCI-Express Mini Card and mSATA Connector
SSODIMM1
DDR3L SO-DIMM Connector