artisan VMIVME-3136A User manual

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12090 South Memorial Parkway
Huntsville, Alabama 35803-3308, USA
[phone]
M [phone] M Fax: [phone]
VMIVME-3136A
HighResolution,Isolated
Analog-to-Digital Converter Board
Product Manual
500-103126-000 Rev. D
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12090 South Memorial Parkway
Huntsville, Alabama 35803-3308, USA
[phone]
M [phone] M Fax: [phone]
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

© Copyright 2001. The information in this document has been carefully checked and is believed to be entirely reliable.
While all reasonable efforts to ensure accuracy have been taken in the preparation of this manual, VMIC assumes no
responsibility resulting from omissions or errors in this manual, or from the use of information contained herein.
VMIC reserves the right to make any changes, without notice, to this or any of VMIC’s products to improve reliability,
performance, function, or design.
VMIC does not assume any liability arising out of the application or use of any product or circuit described herein; nor
does VMIC convey any license under its patent rights or the rights of others.
For warranty and repair policies, refer to VMIC’s Standard Conditions of Sale.
AMXbus, BITMODULE, COSMODULE, DMAbus, IOMax,IOWorks Foundation, IOWorks Manager, IOWorks Server,
MAGICWARE, MEGAMODULE, PLC ACCELERATOR (ACCELERATION), Quick Link, RTnet, Soft Logic Link, SRTbus,
TESTCAL, “The Next Generation PLC”, The PLC Connection, TURBOMODULE, UCLIO, UIOD, UPLC, Visual Soft Logic
Control(ler), VMEaccess, VMEbus Access, VMEmanager, VMEmonitor,VMEnet, VMEnet II, and VMEprobe are
trademarks and The I/O Experts, The I/O Systems Experts, The Soft Logic Experts, and The Total Solutions Provider are
service marks of VMIC.
COPYRIGHT AND TRADEMARKS
VMIC
All Rights Reserved
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purpose, unless granted express written permission from VMIC.
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ActiveX, Microsoft, Microsoft Access, MS-DOS, Visual Basic, Visual C++, Win32, Windows, Windows NT, and XENIX
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Celeron and MMX are trademarks, and Intel and Pentium are registered trademarks of Intel Corporation.
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Other registered trademarks are the property of their respective owners.
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12090 South Memorial Parkway
Huntsville, Alabama 35803-3308, USA
[phone]
M [phone] M Fax: [phone]
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5
Table of Contents
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Safety Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Ground the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Do Not Operate in an Explosive Atmosphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Keep Away from Live Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Do Not Service or Adjust Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Do Not Substitute Parts or Modify System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Dangerous Procedure Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Safety Symbols Used in This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Chapter 1 - Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
VMEbus Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Control and Status Registers (CSRs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Normal Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Calibration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Reconfiguration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Autozero Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Digital Signal Processor (DSP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Electrically Programmable Read-Only Memory (EPROM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Electrically Erasable Programmable Read-Only Memory (E2PROM) . . . . . . . . . . . . . . . . . . . . . . . . 27
Control Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter Board
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Analog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Analog-to-Digital Converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Programmable Gain Amplifier (PGA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
RTD Excitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Open Transducer Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
OPTO Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
DC-to-DC Power Converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter 2 - Configuration and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Physical Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Base Address Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
UIOC Jumper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
RTD Applications and Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Three-Wire RTD Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Four-Wire RTD Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Chapter 3 - Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
General Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Addressing Modes and Board Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Data Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Reset Operations and Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Board Identification Register (BIR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Board Ready Register (BRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Board Control Register (BCR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Select Channel Register (SCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Channel Pass/Fail Status Register (PFS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Target Calibration Voltage Register (TVC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Firmware Revision Register (FRR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
EPROM Writes Registers (EWR1 and EWR0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Control and Status Register (Channel 0 Example). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Offset Coefficients. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Gain Coefficients. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
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Table of Contents
7
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Maintenance Prints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
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9
List of Figures
Figure 1-1 VMIVME-3126A High Resolution, Isolated Analog-to--Digital Converter Board’s Block Diagram 19
Figure 1-2 User’s Calibration Flowchart ..................................................................................................... 24
Figure 1-3 Channel Reconfiguration Flowchart .......................................................................................... 25
Figure 2-1 Address Locations and Configuration ...................................................................................... 35
Figure 2-2 Access and Address Mode Configurations ............................................................................... 36
Figure 2-3 Location of User Configuration Jumpers ................................................................................... 37
Figure 2-4 P3 and P4, 64-Pin DIN Type Connector ................................................................................... 39
Figure 2-5 Differential Input Connection ..................................................................................................... 42
Figure 2-6 Single-Ended Input Connection ................................................................................................ 42
Figure 2-7 Three-Wire RTD Configuration ................................................................................................. 44
Figure 2-8 Four-Wire RTD Configuration ................................................................................................... 45
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11
List of Tables
Table 1-1 Control and Status Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 2-1 P3 Connector Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 2-2 P4 Connector Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Table 2-3 Calibration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Table 3-1 VMIVME-3126A Board’s Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 3-2 Board ID Register’s Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Table 3-3 Board Ready Register’s Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Table 3-4 Board Ready Register’s Bit Definitions (BR[15..0]) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Table 3-5 Board Control Register’s Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Table 3-6 User Gain Coefficients MSW and LSW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Table 3-7 Select Channel Register’s Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Table 3-8 Channel Pass/Fail Status Register’s Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Table 3-9 Target Calibration Voltage Register HI’s Bit Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Table 3-10 Target Calibration Voltage Register LO’s Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Table 3-11 Firmware Revision Register’s Bit Map. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 3-12 EEPROM Writes Register 1’s Bit Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Table 3-13 EEPROM Writes Register 0’s Bit Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Table 3-14 Control and Status Register’s Bit Map. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 3-15 Input Range Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 3-16 Channel -3 dB Cutoff Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
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13
Overview
Contents
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safety Symbols Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Introduction
The VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter board
has 16 independent isolated input channels with 16-bit resolution. Each input has a
dedicated Analog-to-Digital Converter (ADC), input conditioning, reference, and
power supply. Each channel is isolated with opto-isolators from the VMEbus and the
digital circuitry. Self-test is initiated by a VMEbus system reset or by execution of a
software command. A Digital Signal Processor (DSP) provides control and software
correction data. An Electrically Erasable Programmable Read-Only Memory
(E2PROM) loads offset and gain coefficients into the DSP during a reset condition. The
offset and gain coefficients can be recalculated by the user by entering the Calibration
Mode. Software filtering is also done by the DSP to a user-defined cut off frequency.
The following brief overview of principal features illustrates the flexibility and
performance that is available with the VMIVME-3126A board:
• 16-Analog input channels:
(1) Input-to-input and input-to-VMEbus isolation
(2) ADC per channel
• RTD Excitation Source (200 µA/400 µA) per channel
•Open transducer detector per channel
•Full board or user-selected channel calibration
•Unipolar/Bipolar full-scale ADC ranges from 5 mV to 10 V
•Self-Test:
(1) Initiated on power-up or any reset condition
(2) Extensive onboard diagnostic testing capability
(3) Status to user-accessible register
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VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter Board
14
Related Documents
For a detailed explanation of the VMEbus and its characteristics, the publication The
VMEbus Specification is available from:
VITA
VMEbus International Trade Association
7825 East Gelding Drive No.104
Scottsdale, AZ 85260
[phone]
FAX: [phone]
Internet: http://www.vita.com/
EMAIL: [e-mail]
For detailed information concerning the physical description and specifications of the
VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter board, refer
to VMIC’s Specification No. 800-103126-000. This document is availble from:
VME Microsystems International Corporation
12090 South Memorial Parkway
Huntsville, Alabama 35803-3308
[phone]
[phone]
Fax: [phone]
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Overview
15
Safety Summary
The following general safety precautions must be observed during all phases of the
operation, service, and repair of this product. Failure to comply with these
precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture, and intended use of this product.
VME Microsystems International Corporation assumes no liability for the customer's
failure to comply with these requirements.
Ground the System
To minimize shock hazard, the chassis and system cabinet must be connected to an
electrical ground. A three-conductor AC power cable should be used. The power
cable must either be plugged into an approved three-contact electrical outlet or used
with a three-contact to two-contact adapter with the grounding wire (green) firmly
connected to an electrical ground (safety ground) at the power outlet.
Do Not Operate in an Explosive Atmosphere
Do not operate the system in the presence of flammable gases or fumes. Operation of
any electrical system in such an environment constitutes a definite safety hazard.
Keep Away from Live Circuits
Operating personnel must not remove product covers. Component replacement and
internal adjustments must be made by qualified maintenance personnel. Do not
replace components with power cable connected. Under certain conditions,
dangerous voltages may exist even with the power cable removed. To avoid injuries,
always disconnect power and discharge circuits before touching them.
Do Not Service or Adjust Alone
Do not attempt internal service or adjustment unless another person, capable of
rendering first aid and resuscitation, is present.
Do Not Substitute Parts or Modify System
Because of the danger of introducing additional hazards, do not install substitute
parts or perform any unauthorized modification to the product. Return the product
to VME Microsystems International Corporation for service and repair to ensure that
safety features are maintained.
Dangerous Procedure Warnings
Warnings, such as the example below, precede only potentially dangerous procedures
throughout this manual. Instructions contained in the warnings must be followed.
WARNING: Dangerous voltages, capable of causing death, are present in this system.
Use extreme caution when handling, testing, and adjusting.
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VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter Board
16
Safety Symbols Used in This Manual
Indicates dangerous voltage (terminals fed from the interior by voltage exceeding
1000 V are so marked).
Protective conductor terminal. For protection against electrical shock in case of a
fault. Used with field wiring terminals to indicate the terminal which must be
connected to ground before operating equipment.
Low-noise or noiseless, clean ground (earth) terminal. Used for a signal common, as
well as providing protection against electrical shock in case of a fault. Before
operating the equipment, terminal marked with this symbol must be connected to
ground in the manner described in the installation (operation) manual.
Frame or chassis terminal. A connection to the frame (chassis) of the equipment
which normally includes all exposed metal structures.
Alternating current (power line).
Direct current (power line).
Alternating or direct current (power line).
STOP:informs the operator that a practice or procedure should not be performed.
Actions could result in injury or death to personnel, or could result in damage to or
destruction of part or all of the system.
WARNING: denotes a hazard. It calls attention to a procedure, a practice, or
condition which, if not correctly performed or adhered to, could result in injury or
death to personnel.
CAUTION: denotes a hazard. It calls attention to an operating procedure, a practice,
or a condition, which, if not correctly performed or adhered to, could result in damage
to or destruction of part or all of the system.
NOTE: denotes important information. It calls attention to a procedure, a practice, a
condition or the like, which is essential to highlight.
OR
OR
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17
CHAPTER
Theory of Operation
Contents
VMEbus Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrically Programmable Read-Only Memory (EPROM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Electrically Erasable Programmable Read-Only Memory (E2PROM) . . . . . . . . . . . . . . . . . . . 27
Control Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Introduction
The VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter board
provides 16-independent, fully isolated input channels. This capability is attained by
the principal hardware functions listed below (see Figure 1-1 on page 19 for a block
diagram of these functions).
•VMEbus Interface
•Digital Signal Processor
•EPROM
•E2PROM
•Control Logic
•Analog Inputs
1
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18
1VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter Board
VMEbus Interface
The VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter board
responds to word (D16) or byte (D08[EO]) data accesses. Nonprivileged, supervisory,
or both access modes are supported along with short and standard address modes.
Control and Status Registers (CSRs)
The VMIVME-3126A contains several registers available to the user for control and
status of the board. A brief description of the registers is shown in Table 1-1 on
page 20. The registers are explained in detail in Chapter 3 “Programmingg”. The
Control and Status registers begin at offset address $XX00.
Data Registers
The Data Registers’offset address begins at $XX40. Each channel has a unique location
in this 16-word deep buffer. The data format for unipolar inputs is binary and the
format for bipolar is either offset binary or two’s complement as programmed in each
Channel Control Status Register. A Data Ready Flag is set in the Board Control
Register (BCR) indicating when new data is available from the data registers.
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19
VMEbus Interface 1
Figure 1-1 VMIVME-3126A High Resolution, Isolated Analog-to--Digital Converter Board’s Block Diagram
AUTO-
ZERO
SWITCH
X1
X1
IN_HIGH REF
CONTROL
IN_LO
RTD 1
RTD 2
RETURN DATA
ISOLATED
GROUND
ISOLATED
GROUND
+5 V REGULATOR
-5 V REGULATOR
DC
VMEbus
INTERFACE
RAM ERASABLE
PROGRAMMABLE
LOGIC
DSP
E
2
PROM
DSP
BOOT
EPROM
BARRIER
4
+2.5 V
REFERENCE
ADC
ONE OF 16 INDIVIDUAL CHANNELS SHOWN
P1/P2
P3/P4
CH_HIGH
CH_LO
CH_RTD 1
CH_RTD 2
CH_AGND
+5 V
CH_GUARD
ISOLATION
X1
/
DC
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