WinSystems PCM-A/D-16 User manual

OPERATIONS MANUAL
PCM-A/D-16
PCM-A/D-12
WinSystems reserves the right to make changes in the circuitry
and specifications at any time without notice.
© Copyright 1996 by WinSystems. All Rights Reserved.

REVISION HISTORY
P/N 403-0230-000
ECO Number Date Code Rev Level
Originated 960206 B
97-31 970513 B1
WinSystems- "The Embedded Systems Authority"

TABLE OF CONTENTS
SectionParagraph Page
Number Title Number
1General Information
1.1 Features1-1
1.2 General Description 1-1
1.3 Specifications1-2
2PCM-A/D Technical Reference
2.1Introduction2-1
2.2I/O Address Selection2-2
2.3Interrupt Routing2-2
2.4DC-DC Converter Selection 2-3
2.5Mode Selection2-3
2.6 Input Connector Pin Definitions2-8
2.7PC/104 Bus Pin Definitions2-8
2.8Connector/Jumper Summary 2-9
3PCM-A/D Programming Reference
3.1I/O Register Definitions 3-1
3.2Conversion Techniques 3-4
3.3 PCM-A/D Demonstration Program3-5
3.4Calibration Procedures3-7
APPENDIX A PCM-A/D Parts Placement Guide
APPENDIX B PCM-A/D Parts List
APPENDIX C BURR-BROWN ADS7806/ADS7807 Datasheet Reprint
APPENDIX D PCM-A/D Demo Software Source Listing
APPENDIX E PCM-A/D Schematic Diagrams

1GENERAL INFORMATION
1.1Features
nLow Power/Low Cost PC/104 A/D Converter Module
n16 Single ended or 8 Differential input channels
nAvailable in 12-Bit or 16-Bit models
n30uS Auto Conversion Time
nInterrupt available on end of conversion
nInput ranges of 0-5V and +/-10V
nOutput format in straight Binary or Signed two's complement Binary
nExtended industrial operating temperature range
nOptional DC/DC converter for +5V only operation
1.2General Description
The PCM-A/D-16 and PCM-A/D-12 are low cost, general purpose, successive approxi-
mation analog-to-digital converters. The PCM-A/D-16 uses the Burr-Brown ADS7807 16-
bit converter while the PCM-A/D-12 uses the Burr-Brown ADS7806 12-bit converter. Ap-
pendix C contains the datasheet reprints on these components.
The PCM-A/D supports 16 channels in a unipolar 5V range, or a bipolar +/-10 volt
range. Alternately 8 channels of differential input is supported in a 5 volt or 10 volt range.
Repetitive channel conversion time is 25uS and random channel access time is 30uS. The
endofconversioncanbedeterminedviasoftwarepollingorbyaninterrupttotheCPU.
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1.3Specifications
1.3.1Electrical
Bus Interface : PCM-A/D-XX-8 PC/104 8-Bit stackthrough
PCM-A/D-XX-16 PC/104 16-Bit stackthrough
Power requirements :
+5V +/- 5% at 200mA typ. with DC-DC converter installed
15mA typ. w/o DC-DC converter installed
+12V +/-5% at 5mA typ. w/o DC-DC converter installed
-12V +/-5% at 5mA typ. w/o DC-DC converter installed
1.3.2Mechanical
Dimensions : 3.6" X 3.8" X 0.6"
PC Board :FR4 Epoxy glass with 2 signal layers and 2 power planes with screened
component legend and plated through holes.
Jumpers : 0.025" square posts on 0.10" centers.
Connectors : Analog input : 16-pin 0.10" grid RN type IDH-26-LP
1.3.3Environmental
Operating Temperature : -40° C to +85° C
Non-condensing relative humidity : 5% to 95%
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2PCM-A/D Technical Reference
2.1Introduction
Thissection of the manual is intended to providesufficient information regarding con-
figuration and usage of the PCM-A/D-16 and PCM-A/D-12 modules. WinSystems main-
tains a Technical Support Group to help answer questions regarding configuration and
programmingoftheboard.Foranswerstoquestionsnotadequatelyaddressedinthisman-
ual contact Technical Support at [phone] between 8AM and 5PM Central Time.
Technical Support may also be requested by FAX at [phone].
The PCM-A/D has 16 single-ended inputs or 8 differential inputs and converts in 25-
30uS. The end of conversion can be determined in any of three ways. A software timed de-
lay of 30-35uS can be used, the status register can be polled, or an end of conversion inter-
rupt can be used.
2.2I/O Address Selection
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J9
J8
I/O Address
Select Jumper J8
Interrupt Routing
Jumper J9

ThePCM-A/DusesfourconsecutiveI/Oaddresseswiththebaseaddressdeterminedby
thesetting of the jumperson J8.Each positiononthe J8jumper correspondsto anaddress
bit. A jumper installed matches a '0' in the address and a jumper left open matches a '1' in
the address. The illustration below shows the relationship between jumper positions and
address bits and also shows the correct jumpering for a base I/O address of 110H.
2.3Interrupt Routing
Theendof conversioninterrupt maybe routedto anyunusedPC/104interruptline us-
ing the jumper block at J9. The illustration below shows the relationship between the
jumper position and the interrupt selected. A sample jumpering for IRQ5 is also shown.
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A9
A8
A7
A6
A5
A4
A3
A2
J8
BASE I/O ADDRESS 110H
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IRQ15
IRQ14
IRQ12
IRQ11
IRQ10
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
IRQ2
J9
INTERRUPT ROUTING - IRQ5

2.4DC-DC Converter Selection
To allow for slightly better linearity across the full +/-10V input range supported, an
optionalDC-DCconverter is populated at VR1.When installed,it provides +15Vand -15V
to the analog circuitry. This allows the board to function with a +5 volt only supply.
Jumper blocks at J2 and J6 are jumpered to route the +12 and -12 volts from the PC/104
bus to the analog circuitry when the DC-DC converter is not installed.
WARNING :The J2and J6jumpersshould NEVERbeinstalled whentheDC-DCcon-
verterisinstalledordamagetothePCM-A/Dboard,otherPC/104modules,theCPUboard,
or the power supply may result. Boards provided with DC-DC converters from the factory
will not have the jumper posts installed at J2 and J6.
2.5Input Mode Selection
ThePCM-A/Disjumperselectableforoneof4inputmodes.Thesupportedmodesare.
1. 16 single-ended unipolar channels of 0-5V
2. 16 single-ended bipolar channels of +/-10V
3. 8 differential channels of 0-5V
4. 8 differential channels of +/-10V
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2 o
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J7
J5
J1
J4
Mode configuration
jumpers J1, J4, J5, J7

2.5.1Mode 1- 0-5V Single-Ended Unipolar
This input mode provides for 16 channels of 0-5 volt input range. In no case should the
inputbedrivennegativeinthismode.Thecorrectjumperingforthismodeisshownbelow:
Each channel's input is delivered at J3. Refer to section 2.6 for input pin definitions.
When used in mode 1, binary values from 0 to FFF0H (FFFFH) are read from the con-
verter according to the following table.
Full Scale Range:0.0 - 5.0 Volts
Least Significant Bit (LSB) :76uV (16-Bit)
or 1.22mV (12-Bit)
+Full Scale (FS-1LSB) : 4.999924V (16-Bit)
or 4.99878V (12- Bit) FFFFH
Midscale : 2.50V 8000H
One LSB Below Midscale : 2.4999924V(16-Bit)
or 2.49878(12-Bit) 7FFFH
-Full Scale :0.0V 0000H
NOTE : On the PCM-A/D-12 the lower nibble of the hex value will always be 0.
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J1J7J5J4
0-5 Volt - Single-Ended Mode

2.5.2 Mode 2- +/-10V Single-Ended Bipolar
Thisinputmode provides for16 channels of +-10Vinput range.The correctjumpering
for this mode is shown below :
Each channel's input is connected to J3. Refer to section 2.6 for input pin definitions.
When used in mode 2, two's complement binary values from 8000H to 7FFFH are read
from the converter according to the following table.
Full Scale Range :+/-10.0V
Least Significant bit :305uV (16-Bit)
or 4.88mV (12-Bit)
+Full Scale (FS-1LSB) : 9.999695V (16-Bit)
or 9.99512 (12-Bit) 7FFFH
Midscale : 0.0V 0000H
One LSB below Midscale : -305uV (16Bit)
or -4.88mV (12-Bit) FFFFH
-Full Scale :-10.0V 8000H
NOTE:On the PCM-A/D-12 the lower nibble of all hex values will be 0.
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1 o
2 o
3o
J1J7J5J4
+/-10 Volt - Single Ended Bipolar Mode