Diamond Systems Poseidon User manual

Poseidon User Manual
EPIC format VIA CPU Board with Integrated Data Acquisition
7463010 v1 2
© Copyright 2007
1255 Terra Bella Ave
Mountain View, CA 94043
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www diamondsystems com
Diamond Systems Corporation Poseidon User Manual Page 1

Table of Contents
Introduction......................................................................................................................7
Description and Features 7
Block Diagram 9
Functional Overview 10
Board Description 13
Connector Summary 14
Jumper Summary 14
Connectors.....................................................................................................................15
PC/104 ISA Bus 15
PC/104-Plus PCI Bus 16
PS2 Mouse and Keyboard connector 17
Utility Connector 17
Data Acquisition (Digital I/O) Connector 19
Data Acquisition (Analog I/O) Connector 20
Ethernet Connector 21
Audio I/O Connector 21
Speaker Connector 22
External Auxiliary Power Connector (Output) 23
IDE Connector 24
Serial Port I/O Connector 25
External Battery Connector 27
LCD Panel (LVDS Interface) Connector 28
VGA Connector 29
LCD Backlight Connector 30
Power Input Connector 30
USB 2 0 Connectors 31
Serial ATA Connector 32
I/O Panel Power 33
Standard JTAG Configuration Interface (Factory Use) 34
Reference Voltage Test Point (Factory Use) 34
Board Configuration......................................................................................................35
Power Configuration Options 35
PCI VI/O Voltage Setting (JP1) 35
DAQ Configuration (JP2) 37
COM3/COM4/ADC IRQ Configuration (JP3) 38
Analog I/O Single-ended/Differential Configuration (JP4) 39
DAC Configuration (JP5) 40
Battery Connection (JP6) 41
ATX Power Control (JP7) 42
RS-422/RS-485 Termination Configuration (JP8) 43
DIO Pull-up/Pull-down Configuration (JP9) 43
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System Features............................................................................................................44
System Resources 44
Console Redirection to a Serial Port 44
Flash Memory 45
Backup Battery 45
System Reset 46
On-Board Video 46
System I/O......................................................................................................................47
Ethernet 47
Serial Ports 47
PS/2 Ports 48
USB Ports 48
Data Ac uisition Circuit................................................................................................50
Data Acquisition Circuitry I/O Map 51
I/O Register Summary 53
I/O Register Definitions 55
Enabling Enhanced Features.......................................................................................76
Enhanced Mode 76
Normal Mode 76
Analog-to-Digital Input Ranges and Resolution.........................................................77
Overview 77
Unipolar and Bipolar Inputs 77
Input Ranges and Resolutions 77
A/D Conversion Formulas 78
Performing an A/D Conversion....................................................................................80
Select the Input Channel 80
Select the Input Range 81
Wait for Analog Input Circuit to Settle 81
Perform an A/D Conversion on the Current Channel 81
Wait for the Conversion to Finish 81
Read the Data from the Board 81
Convert the numerical data to a meaningful value 82
A/D Sampling Methods..................................................................................................83
Sampling Modes 83
FIFO Description 84
Scan Sampling 84
Sequential Sampling 84
How To Perform Conversions Using Interrupts.........................................................85
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Analog Output Ranges and Resolution.......................................................................86
Description 86
Resolution 86
Full-scale Range Selection 86
Digital-to-Analog Conversion.......................................................................................87
Compute the D/A Output Value for the Desired Output Voltage 87
Compute the LSB and MSB Values 87
Add the Channel Number to the MSB 88
Set D/A Simultaneous Update Bit 88
Write the LSB and MSB to the Board 88
Monitor the DACBUSY Status Bit 88
Waveform Generator.....................................................................................................90
Description 90
Programming the D/A Waveform Generator 90
Auto-calibration.............................................................................................................92
Background 92
Performing Auto-calibration with Software 93
Performing Auto-calibration with dsPIC 93
Digital I/O Operation......................................................................................................94
Main Digital I/O Internal 82C55 Circuit 94
Auxiliary Digital I/O 95
Counter/Timer Operation..............................................................................................97
Counter/Timer Features and Configuration Options 97
Counter/Timer Configuration 97
Counter/Timer Access and Programming 97
Watchdog Timer Programming....................................................................................98
FlashDisk Module........................................................................................................100
Installing the FlashDisk Module 100
Using the FlashDisk with Another IDE Drive 101
Power Supply 101
FlashDisk Programmer Board....................................................................................102
I/O Cables.....................................................................................................................103
Mounting PC/104-Plus Cards onto a Poseidon Baseboard.................................... 104
Customization Options...............................................................................................105
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PNL-PSD Panel I/O Board for Poseidon CPU...........................................................106
Specifications..............................................................................................................115
CPU 115
Data Acquisition Circuitry 115
Power Supply 116
General 116
Additional Information................................................................................................117
Appendix A. COM3/4/ADC IRQ Configuration for First Release Boards, Rev A1
.......................................................................................................................................118
Technical Support........................................................................................................119
Figures
Figure 1: Poseidon Functional Block Diagram 9
Figure 2: Poseidon Board Layout 13
Figure 3: CN6 and CN7 Connectors 15
Figure 4: CN3 Connector 16
Figure 5: CN10 Connector 23
Figure 6: CN8 Connector 27
Figure 7: LCD Panel Connector 28
Figure 8: CN4 Connector 30
Figure 9: CN9 Connector 30
Figure 10: Serial ATA Connector 32
Figure 11: Jumper Block JP1 35
Figure 12: JP1 Settings 36
Figure 13: Base Address Configuration Example 37
Figure 14: DMA Channel Selection 37
Figure 15: Bus Width Configuration 38
Figure 16: IRQ Selection Example 39
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Figure 17: Analog I/O Single-ended/Differential Configuration Example 40
Figure 18: JP5 Jumper Block 40
Figure 19: D/A Configuration for ±5V Output Range Example 41
Figure 20: D/A Configuration to Reset to Zero Scale Example 41
Figure 21: JP6 Jumper 41
Figure 22: ATX Configuration Using JP7 42
Figure 23: RS-422/RS-485 Termination Configuration Options 43
Figure 24: DIO Pull-up/Pull-down Configuration 43
Figure 25: Data Acquisition Block Diagram 50
Figure 26: FlashDisk Module 100
Figure 27: FlashDisk Programmer Board Layout 102
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Introduction
Poseidon is an embedded single board computer (SBC) in an EPIC form factor that integrates CPU and data acquisition
circuitry into a single board.
Poseidon conforms to the EPIC standard with expansion support via PC/ 04-Plus, an embedded standard that is
based on the ISA and PCI buses and provides a compact, rugged mechanical design for embedded systems. PC/ 04
modules feature a pin and socket connection system in place of card edge connectors, as well as mounting holes for
stand-offs in each corner. The result is an extremely rugged computer system fit for mobile and miniature
applications. PC/ 04 modules stack together with 0.6” spacing between boards (0.662” pitch including the
thickness of the PCB).
Poseidon uses the PCI bus internally to connect the Ethernet circuit to the processor. It uses the ISA bus internally
to connect serial ports 3 and 4, as well as the data acquisition circuit, to the processor. Both the ISA and PCI buses
are brought out to expansion connectors for the connection of add-on boards. Diamond Systems manufactures a
wide variety of compatible PC/ 04 add-on boards for analog I/O, digital I/O, counter/timer functions, serial ports,
and power supplies.
Description and Features
The Poseidon board is an all-in-one embedded SBC with the following key system and data acquisition features.
Processor Section
•Low-power, fanless .0GHz VIA Eden ULV CPU or high-performance 2.0GHz VIA C7 CPU.
•512MB or 1GB 533MHz DDR2 RAM soldered, on-board, system memory.
•400MHz front side bus.
•2MB 6-bit wide integrated flash memory for BIOS and user programs.
•Advanced 2D/3D graphics engine with integral MPEG-2 hardware acceleration.
•33MHz PCI Bus.
I/O Section
•4 serial ports, 5.2kbaud max.
•2 ports 6550-compatible
•2 ports 6850-compatible with 28-byte FIFOs and RS-232, RS-422 and RS-485 capability, with RS-
422/485 termination.
•4 USB 2.0 ports.
•Accepts solid-state IDE FlashDisk modules directly on board.
•0-/ 00-/ 000BaseT Gigabit Ethernet.
•CRT and 24-bit dual channel LVDS flat panel support.
•Dual Independent Display.
•PS/2 keyboard and mouse ports.
•S-ATA and UDMA- 00 IDE interfaces.
•Interface for amplified audio.
Analog Input
•32 single-ended/ 6 differential inputs, 6-bit resolution.
•250KHz maximum aggregate A/D sampling rate.
•Bipolar input ranges: ± 0V, ±5V, ±2.5V, ± .25V, ±0.625V.
•Unipolar input ranges: 0- 0V, 0-5V, 0-2.5V, 0- .25V, 0-.625V.
•5 ppm/°C drift accuracy.
•Internal and external A/D triggering.
•024-sample FIFO for reliable high-speed sampling and scan operation.
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Analog Output
•4 analog outputs, 2-bit resolution.
•±5V, ± 0V, 0-5V, 0- 0V output ranges available.
•Simultaneous update.
•Adjustable output range (optional).
Digital I/O
•24 programmable digital I/O lines, 3.3V and 5V logic compatible.
•Enhanced output current capability: +64/- 5mA max.
•Selectable pull-up/down resistors on board.
Counter/Timers
• 24-bit counter/timer for A/D sampling rate control.
• 6-bit counter/timer for user counting and timing functions.
•Programmable gate and count enable.
•Internal and external clocking capability.
System Features
•Plug and play BIOS with IDE auto detection, 32-bit IDE access, and LBA support.
•User-selectable COM or COM2 terminal mode.
•On-board lithium backup battery for real-time-clock and CMOS RAM.
•ATX power switching capability.
•Programmable watchdog timer.
•I/O panel board that connects to on-board I/O brought to pin headers, to provide PC-style connectors.
•Power supply: 5VDC operation from the PC- 04 bus.
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Block Diagram
Figure shows the Poseidon functional blocks.
Diamond Systems Corporation Poseidon User Manual Page
Figure : Poseidon Functional Block Diagram

Functional Overview
This section describes the major Poseidon subsystems.
Processor
Two processor options are available for the Poseidon board.
•Low-power, fanless .0GHz VIA Eden ULV CPU
•High-performance 2.0GHz VIA C7 CPU
North Bridge and South Bridge
The North and South bridge are integrated in the on-board VIA CX700 chip.
Memory
The board accommodates 5 2MB or 1GB of SDRAM system memory soldered on the board. No expansion connector
is provided for additional memory.
The board also includes flash memory for storage of BIOS and user programs. Flash memory is accessible via the
on-board ISA bus.
ideo Features
Video circuitry is provided by the VIA CX700 chipset and includes,
•Dual 200MHz 2D/3D graphics engines featuring dedicated 28-bit data paths for pixel data flow and
texture/command access.
•An integrated MPEG-2 decoder.
•Dual independent display with separate frame buffers for CRT and flat panel displays.
Audio
The design provides AC97 audio support derived from the South Bridge chip. The Via VT 6 2A CODEC provides
audio processing. Give special attention to design and routing to minimize noise on the audio I/O lines.
Audio I/O includes,
•Stereo line in.
•Stereo line out.
•Mono mic in.
•Stereo internal line in.
The board includes audio power amplifier circuitry for stereo speaker output. The amplifier circuit is powered by
+5VDC from the board. User DC control of volume is also provided, which overrides the software settings.
Ethernet
The board supports 0-/ 00-/ 000BaseT (Gigabit) Ethernet. Magnetics are included on the board so that a complete
circuit is provided.
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Data Acquisition
The board provides the following data acquisition capabilities.
Type of I/O Characteristics
Analog Input 32 single-ended/ 6 differential inputs, 6-bit resolution
Analog Output Four analog outputs, 2-bit resolution
Digital I/O 24 programmable digital I/O, 3.3V and 5V logic compatible
Counter/Timers One 24-bit counter/timer for A/D sampling rate control
One 6-bit counter/timer for user counting and timing
functions
Standard Peripherals
The board provides the following standard system peripherals.
Peripheral Characteristics
Serial ports Four serial ports
PS/2 ports Keyboard and mouse
USB ports Four USB 2.0 function ports
IDE ports One 44-pin connector for HDD or FlashDisk
Compact flash socket
One standard S-ATA connector for up to two S-ATA HDD
Serial ports 3 and 4 can be BIOS-selected for RS-232, RS-485 or RS-422. Termination resistors of 20 ohms can be
jumper-enabled on these two ports.
Console redirection feature is incorporated. This feature enables keyboard input and character video output to be
routed to one of the serial ports.
The board contains provision for mounting a solid state IDE flashdisk module with capacities ranging from 32MB
and greater. The module mounts onto the board using a 44-pin 2mm pitch header and a hold-down mounting hole
with spacer and screws.
Bus Interfaces
The PCI bus is the primary connection between the North/South bridge, Ethernet, and PC/ 04-Plus devices.
The ISA bus is exposed on PC/ 04 connectors for use by add-on modules. The PC/ 04-Plus connectors allow
expansion above the board only.
Power Supply
The power supply is an on-board converter, allowing an input range of +5VDC, ±5%. Jumper selection allows
power to be taken from the PC- 04 bus and not from the on-board converter.
The power supply includes ATX power switching and ACPI power management support. The master +5V input is
controlled by the ATX function with an external switch input.
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Battery Backup
The board includes a backup battery for CMOS RAM and real-time clock backup. The battery life is greater than
four years. A connector and jumper are provided to disable the on-board battery and enable the use of an external
battery, instead.
Watchdog Timer
A watchdog timer (WDT) circuit consists of a programmable timer.
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Board Description
Board Layout
Figure 2 shows the Poseidon board layout, including connectors, jumper blocks and mounting holes.
Diamond Systems Corporation Poseidon User Manual Page 13
Figure 2: Poseidon Board Layout

Connector ummary
The following table lists the connectors on the Poseidon board.
Connector Description Manufacturer Part No.
CN LCD panel (LVDS interface) JST: BM30B-SRDS-G-TF
CN2 Primary IDE Standard 2x22, 0. ” header
CN3 PC/ 04-Plus PCI bus connector EPT 264-60303-02
CN4 LCD backlight TYCO 640456-3
CN5 Serial ATA CATCH SATA-75
CN6 PC/ 04, ISA bus A,B EPT 962-40323-03
CN7 PC/ 04, ISA bus C,D EPT 962-40203-03
CN8 External battery TYCO 640456-2
CN9 Input Power Molex 39-31-0088
CN 0 External auxiliary power (output) TYCO 640456-4
CN Speaker Standard 2x4, 2mm header
CN 2 Data acquisition digital I/O, 34-pin Standard 2x 7, 2mm header
CN 3 Data acquisition analog I/O, 40-pin Standard 2x20, 2mm header
CN 4 I/O panel power Standard 2x 0, 2mm header
CN 5 Audio I/O Standard 2x5, 2mm header
CN 6 VGA Standard 2x5, 2mm header
CN 7 Ethernet Standard 2x5, 2mm header
CN 8 Standard button/LED utility connector Standard 2x4, 2mm header
CN 9 PS/2 Mouse and keyboard Standard 2x4, 2mm header
CN20 RS-232/RS-485/RS-422 serial I/O (COM -4) Standard 2x20, 2mm header
CN2 USB 0/ , USB 2/3 (USB 2.0) Standard 2x 0, 2mm header
J Standard JTAG interface (Factory use) -
J2 Voltage reference test point (Factory use) -
Jumper ummary
The following table lists the jumpers on the Poseidon board.
Jumper Description
JP PCI voltage selection
JP2 DAQ configuration
JP3 COM3/4 and DAQ IRQ selection
JP4 DAQ single-ended/differential selection
JP5 DAC range configuration
JP6 Battery power selection
JP7 ATX power
JP8 RS-422/485 termination
JP9 DIO pull-up/pull-down configuration
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Connectors
This section describes the on-board Poseidon connectors.
PC/104 I A Bus
Connectors CN6 and CN7 carry the ISA bus signals. Figure 3 shows the PC/ 04 A and B pin layout for CN6, and
the C and D pin layout for CN7.
CN6 Connector Pinout CN7 Connector Pinout
IOCHCHK- A1 B1 GND GND D0 D0 GND
SD7 A2 B2 RESETDRV SBHE- D1 D1 MEMCS16--
SD6 A3 B3 +5V LA23 D2 D2 IOCS16-
SD5 A4 B4 IRQ9 LA22 D3 D3 IRQ10
SD4 A5 B5 -5V LA21 D4 D4 IRQ11
SD3 A6 B6 DRQ2 LA20 D5 D5 IRQ12
SD2 A7 B7 -12V LA19 D6 D6 IRQ15
SD1 A8 B8 ENDXFR- LA18 D7 D7 IRQ14
SD0 A9 B9 +12V LA17 D8 D8 DACK0-
IOCHRDY A10 B10 keyed MEMR- D9 D9 DRQ0
AEN A11 B11 SMEMW- MEMW- D10 D10 DACK5-
SA19 A12 B12 SMEMR- SD8 D11 D11 DRQ5
SA18 A13 B13 IOW- SD9 D12 D12 DACK6-
SA17 A14 B14 IOR- SD10 D13 D13 DRQ6
SA16 A15 B15 DACK3- SD11 D14 D14 DACK7-
SA15 A16 B16 DRQ3 SD12 D15 D15 DRQ7
SA14 A17 B17 DACK1- SD13 D16 D16 +5
SA13 A18 B18 DRQ1 SD14 D17 D17 MASTER-
SA12 A19 B19 REFRESH- SD15 D18 D18 GND
SA11 A20 B20 SYSCLK keyed D19 D19 GND
SA10 A21 B21 IRQ7
SA9 A22 B22 IRQ6
SA8 A23 B23 IRQ5
SA7 A24 B24 IRQ4
SA6 A25 B25 IRQ3
SA5 A26 B26 DACK2-
SA4 A27 B27 TC
SA3 A28 B28 BALE
SA2 A29 B29 +5V
SA1 A30 B30 OSC
SA0 A31 B31 GND
GND A32 B32 GND
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Figure 3: CN6 and CN7 Connectors

PC/104-Plus PCI Bus
The PC/ 04-Plus bus is essentially identical to the PCI Bus except for the physical design. A single pin and socket
connector is specified for the bus signals. A 20-pin header, J3, arranged as four 30-pin rows incorporates a full 32-
bit, 33MHz PCI Bus. The additional pins on the PC/ 04-Plus connectors are used as ground or key pins. The
female sockets on the top of the board enable stacking another PC/ 04-Plus board on top of the Poseidon board.
A
B
C
D
1
GND/5 0V KEY
Reserved
+5V
AD00
2
VI/O
AD02
AD01
+5V
3
AD05
GND
AD04
AD03
4
C/BE0*
AD07
GND
AD06
5
GND
AD09
AD08
GND
6
AD11
VI/O
AD10
M66EN
7
AD14
AD13
GND
AD12
8
+3 3V
C/BE1*
AD15
+3 3V
9
SERR*
GND
Reserved
PAR
10
GND
PERR*
+3 3V
Reserved
11
STOP*
+3 3V
LOCK*
GND
12
+3 3V
TRDY*
GND
DESEL*
13
FRAME*
GND
IRDY*
+3 3V
14
GND
AD16
+3 3V
C/BE2*
15
AD18
+3 3V
AD17
GND
16
AD21
AD20
GND
AD19
17
+3 3V
AD23
AD22
+3 3V
18
IDSEL0
GND
IDSEL1
IDSEL2
19
AD24
C/BE3*
VI/O
IDSEL3
20
GND
AD26
AD25
GND
21
AD29
+5V
AD28
AD27
22
+5V
AD30
GND
AD31
23
REQ0*
GND
REQ1*
VI/O
24
GND
REQ2*
+5V
GNT0*
25
GNT1*
VI/O
GNT2*
GND
26
+5V
CLK0
GND
CLK1
27
CLK2
+5V
CLK3
GND
28
GND
INTD*
+5V
RST*
29
+12V
INTA*
INTB*
INTC*
30
-12V
REQ3*
GNT3*
GND/3 3V KEY
On the Poseidon, all of the PCI circuitry is driven with 3.3V circuitry and is 5V tolerant. The main board can
support either 3.3V or 5V-only cards. For this reason, the connector is not keyed (to prevent certain types of cards
from being inserted).
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Figure 4: CN3 Connector

P 2 Mouse and Keyboard connector
Connector CN 9 is a 2x4-pin header used to connect a mouse or keyboard.
+5Vin 1 2 -
Keyboard data 3 4 Mouse data
Keyboard clock 5 6 Mouse clock
Ground 7 8 -
ignal Definition
+5Vin keyboard PS/2 pin 4
Keyboard data keyboard PS/2 pin
Mouse data mouse PS/2 pin
Keyboard clock keyboard PS/2 pin 5
Mouse clock mouse PS/2 pin 5
Ground PS/2 pin 3
Utility Connector
Connector CN 8 is a 2/4-pin header for access to the standard button/LED connections.
Speaker 1 2 PW LED
ATX power button 3 4 -
Ground 5 6 Ground
Reset key 7 8 -
The following table describes the CN 8 connector pinouts.
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ignal Definition
Speaker The signal on the Speaker pin is referenced to +5V out. Connect a speaker between this pin
and +5V out.
PW LED Switched power output to connect a panel power LED. No series resistor is needed.
ATX power button The ATX power button should be tied to ground whenever the “Power Button” is used. The
“Power Button” has different functionality, depending on the current system mode and
software operation. In general, the following guidelines apply.
•If the board is powered down, toggling (i.e., tie to ground briefly, then release) this
button turns the system on, causing all non-standby voltages to become active.
NOTE: depending on the default configuration, the system usually powers-up
immediately as power is applied
•If the system is currently powered up and active, toggling (i.e., tie to ground briefly, then
release) this button causes a system power-down event to be initiated. Typically, this
powers-down the monitor, hard drive, and any other non-essential functions. The system
must be operating and the software executing normally for this function. Under
Windows and some other OSs, this power-down event may cause the system to shut
down. Typically, this is software-configurable via an option setting for the given OS.
•If the system is currently powered-up and active, holding this button for four seconds
causes a forced system shutdown. This is a hardware power-down, which can be
detrimental to many OSs due to the fact that they are not given adequate time to initiate
shut-down sequencing. This operation should only be used in critical circumstances,
such as when the system itself is locked due to system instability or a software crash.
After powering the system down in this manner, the system remains powered down until
the power button is toggled (tied to ground again and released).
When ATX is enabled, a momentary contact between this pin and Ground causes the CPU to
turn on and a contact of four seconds or longer generates a power shutdown.
ATX power control is enabled using a jumper on jumper block JP7.
Ground Ground
Reset key Connection between Reset key and ground generate a reset condition. The board remains in a
reset state (with non-standby power rails disabled) until Reset key is removed from ground.
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Data Acquisition (Digital I/O) Connector
Poseidon includes a 2x 7-pin header, CN 2, for all digital data acquisition I/O.
DIO A7 1 2 DIO A6
DIO A5 3 4 DIO A4
DIO A3 5 6 DIO A2
DIO A1 7 8 DIO A0
DIO B7 9 10 DIO B6
DIO B5 11 12 DIO B4
DIO B3 13 14 DIO B2
DIO B1 15 16 DIO B0
DIO C7 17 18 DIO C6
DIO C5 19 20 DIO C4
DIO C3 21 22 DIO C2
DIO C1 23 24 DIO C0
DIN0/CLK0 25 26 DIN1/GATE0
DOUT0/CTROUT0 27 28 DOUT2/CTROUT2
AD_RCB 29 30 DOUT1/SHOUT
DIN3/EXTCLK 31 32 DIN2/EXTGATE
+5V out 33 34 Ground
ignal Definition
DIO A7-A0 Digital I/O port A; programmable direction
DIO B7-B0 Digital I/O port B; programmable direction
DIO C7-C0 Digital I/O port C; programmable direction
DIN0- Digital input port with counter/timer and external trigger
functions
DOUT0-2 Digital output port with counter/timer functions
CLK0 Input source to Ctr 0
GATE0 Pin to control gating of Ctr 0
CROUT0 Counter 0 output
CROUT2 Counter 2 output
AD_RCB A/D convert signal output; can be used to synchronize
multiple boards
SHOUT -
EXTCLK External A/D trigger input; Also used for digital interrupt
(DINT) input
EXTGATE Pin to control gating of Ctrs & 2 for A/D timing
+5V out Connected to switched +5V supply (Output only! Do not
connect to external supply)
Ground Digital ground (0V - reference); used for digital circuitry only
Diamond Systems Corporation Poseidon User Manual Page 1

Data Acquisition (Analog I/O) Connector
Connector CN 3 is a 2x20-pin header used for analog I/O data acquisition.
ingle-ended Differential
Vin 0 1 2 Vin 16 Vin 0 + 1 2 Vin 0 -
Vin 1 3 4 Vin 17 Vin 1 + 3 4 Vin 1 -
Vin 2 5 6 Vin 18 Vin 2 + 5 6 Vin 2 -
Vin 3 7 8 Vin 19 Vin 3 + 7 8 Vin 3 -
Vin 4 9 10 Vin 20 Vin 4 + 9 10 Vin 4 -
Vin 5 11 12 Vin 21 Vin 5 + 11 12 Vin 5 -
Vin 6 13 14 Vin 22 Vin 6 + 13 14 Vin 6 -
Vin 7 15 16 Vin 23 Vin 7 + 15 16 Vin 7 -
Vin 8 17 18 Vin 24 Vin 8 + 17 18 Vin 8 -
Vin 9 19 20 Vin 25 Vin 9 + 19 20 Vin 9 -
Vin 10 21 22 Vin 26 Vin 10 + 21 22 Vin 10 -
Vin 11 23 24 Vin 27 Vin 11 + 23 24 Vin 11 -
Vin 12 25 26 Vin 28 Vin 12 + 25 26 Vin 12 -
Vin 13 27 28 Vin 29 Vin 13 + 27 28 Vin 13 -
Vin 14 29 30 Vin 30 Vin 14 + 29 30 Vin 14 -
Vin 15 31 32 Vin 31 Vin 15 + 31 32 Vin 15 -
Output ground 33 34 Vout 0 Output ground 33 34 Vout 0
Vout 1 35 36 Vout 2 Vout 1 35 36 Vout 2
Vout 3 37 38 Analog ground Vout 3 37 38 Analog ground
DIN3/EXTCLK 39 40 Digital ground DIN3/EXTCLK 39 40 Digital ground
ignal Definition
Vout3-0 Analog output channels 3 – 0
Analog Ground 0V analog reference
Vin 3 ~ Vin 0 Analog input channels 3 – 0 in single-ended mode
Vin 5 + ~ Vin 0 + High side of input channels 5 – 0 in differential mode
Vin 5 - ~ Vin 0 - Low side of input channels 5 – 0 in differential mode
Digital ground 0V digital reference
DIN3 Digital input port with counter/timer and external trigger
functions
EXTCLK External A/D trigger input; Also used for digital interrupt
(DINT) input
NOTE: The reference grounds are NOT decoupled from the power grounds – they are indirectly
connected to the power supply input (and other on-board ground/0V references) Do not assume that
these grounds are floating Do not apply a high-voltage input (relative to the power input ground) to
these ground signals or to any other board I/O pin
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