PCM-DAC02. PCMCIA Dual Analog Outputs. User s Manual

Transcription

1 PCM-DAC02 PCMCIA Dual Analog Outputs User s Manual Revision 3 August, 2001

2 MEGA-FIFO, the CIO prefix to data acquisition board model numbers, the PCM prefix to data acquisition board model numbers, PCM-DAS08, PCM-D24C3, PCM-DAC02, PCM-COM422, PCM-COM485, PCM-DMM, PCM-DAS16D/12, PCM-DAS16S/12, PCM-DAS16D/16, PCM-DAS16S/16, PCI-DAS6402/16, Universal Library, InstaCal, Harsh Environment Warranty and Measurement Computing Corporation are registered trademarks of Measurement Computing Corporation. IBM, PC, and PC/AT are trademarks of International Business Machines Corp. Windows is a trademark of Microsoft Corp. All other trademarks are the property of their respective owners. Information furnished by Measurement Computing Corp. is believed to be accurate and reliable. However, no responsibility is assumed by Measurement Computing Corporation neither for its use; nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by photocopying, recording or otherwise without the prior written permission of Measurement Computing Corporation. Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and/or devices without the written approval of the President of Measurement Computing Corporation Life support devices/systems are devices or systems which, a) are intended for surgical implantation into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result in injury. Measurement Computing Corp. products are not designed with the components required, and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people. (C) Copyright 2001, Measurement Computing Corporation HM PCM-DAC02.lwp

3 Table of Contents.. 1 INTRODUCTION... 2 INSTALLATION INSTALL InstaCal SOFTWARE INSTALL THE PCMCIA CARD... 3 INTERFACING PCM-DAC02 CONNECTOR CONNECTING DEVICES TO THE ANALOG OUTPUTS OUTPUT VOLTAGE RANGES SIGNAL CONNECTION ETERNAL INTERRUPT INPUT DIGITAL INPUTS & OUTPUTS... 4 PROGRAMMING & APPLICATIONS PROGRAMMING LANGUAGES PACKAGED APPLICATIONS PROGRAMS... 5 CALIBRATION... 6 I/O ADDRESS MAP & REGISTER FUNCTIONS CONTROL REGISTERS 7 SPECIFICATIONS POWER CONSUMPTION...11 ANALOG OUTPUT...11 DIGITAL I/O...11 ENVIRONMENTAL PCM-C15-10-INCH CABLE

4 This page is blank.

5 1 INTRODUCTION The PCM-DAC02 is an analog output control board for IBM PC compatible computers with PCMCIA type slots. The heart of the board is a dual 12-bit digital-toanalog converter. Analog voltage signals are generated by the D/A from registers. Control of I/O operations is done by the Field Programmable Gate Array (FPGA) on the board (Figure 1-1). Double-buffering of the output registers permit simultaneous output changes. Ranges of the two analog outputs are individually programmable for bipolar ±5V or ±10V, or unipolar 0 to 5V or 0 to 10V. Eight bi-directional digital I/O lines arranged in two, 4-bit ports provide the capability of sensing and controlling discrete events. The ports can be programmed to be eight inputs, eight outputs, or four inputs and four outputs. HOST BUS ADAPTER PCMCIA BUS CONNECTOR P1 (68-PIN) DATA BUS ATTRIBUTE MEMORY ADDRESS BUS D/A CONVERTER 12-BIT D/A CONVERTER 12-BIT CONTROLLER FPGA DIGITAL I/O PORT 4 BITS DIGITAL I/O PORT 4 BITS P2 CONNECTOR (15 PIN) PCM-DAC02 Figure 1-1. PCM-DAC02 Block Diagram 1

6 2 INSTALLATION 2.1 INSTALL InstaCal SOFTWARE InstaCal is the installation, calibration and test software supplied with the board. Refer to the Extended Software Installation Manual to install InstaCal. 2.2 INSTALL THE PCMCIA CARD Your PCM card is completely plug and play. There are no switches or jumpers to set prior to installation in your computer. Simply follow the steps shown below to install your PCM hardware. 1. Insert the card into a free PC Card/PCMCIA type II or III slot. You do not have to turn the computer off. The system is designed for power on installation. Shown here is a PCM card case looking into the connector which is inserted into the PCMCIA slot of your computer. The KEY helps to insure that the PCM board is inserted in the correct orientation. 2. If the appropriate driver is already loaded on the PC, the card should be detected, recognized, and configured by Windows and you should hear an insertion beep. To verify the card has been recognized, go to Control Panel\System\Device Manager and the card should now appear under "DAS Component." 2

7 3 INTERFACING The PCM-DAC02 connector has two single-ended analog outputs, one interrupt input, eight digital inputs/outputs and three ground pins. A chassis ground is in the cable shield clips to either side of the 15 pins of the connector. 3.1 PCM-DAC02 CONNECTOR Figure 3-1 shows a PCM-DAC02 case looking into the connector. The KEY helps to insure that the cable is inserted in the correct orientation. Figure 3-1. PCM-DAC02 I/O Connector Analog devices to be controlled should be connected with the high side to the numbered analog output and the low side to an adjacent ground. 3

8 3.2 CONNECTING DEVICES TO THE ANALOG OUTPUTS The PCM-DAC02 analog outputs are single ended. When connecting analog output channels, use pin 1 ground for channel 0 (pin 2), and pin 3 ground for channel 1 (pin 4). You must avoid potentials between signal ground and chassis ground on your computer. If you are using a laptop and are on battery power, the computer is floating with respect to earth ground, but the laptop is on the charger unit or on wall power, the laptop may be grounded. Whenever the computer is grounded, you must connect signals so there is no potential between PC ground and signal ground. If there is a potential, it will be added to the signal. For example, if your PCM-DAC02 is supplying 3.5 volts and there is a potential of -1.5V between the PC and the sensor ground, your device under control will be reading 2.0V instead of 3.5V 3.3 OUTPUT VOLTAGE RANGES There are four possible output voltage ranges. Each DAC can be controlled independently, meaning that each DAC may have a different range. The output voltage range is controlled by software. To learn about controlling the output range of the DACs please consult your software manual, either Universal library for programmers, or your Labtech or other package application user's manual. The available ranges are: Range LSB Step Size 0 Code 2048 Code 4095 Code 0 to 5V V 0 V 2.50V V 0 to 10V V 0 V 5.00V V ±5V V 5 V 0 V V ±10V V 10V 0 V V 3.4 SIGNAL CONNECTION The outputs of the PCM-DAC02 are two-wire voltages. There is a polarity associated with the two wires and thus the outputs are labeled Analog Out Channel # and Ground, on the connector. In unipolar mode, the output high and the ground line are at the same level when the DAC code is zero. In bipolar mode, the output high and ground are the same at a code of

9 The maximum current supplied by the analog outputs is 2.5 ma. Loads drawing higher currents than this will cause the analog output to droop, meaning that a code of 4095 will not be able to generate a full scale voltage of 5V, but one somewhat less. It is best to group the ground on pin 1 with the analog output on pin 2, and the ground on pin 3 with the analog output on pin ETERNAL INTERRUPT INPUT The PCM-DAC02 pin 5 is the input to a circuit which will generate an interrupt to the computer. The interrupt must be enabled through software. The interrupt is level sensitive and is triggered on a TTL high level. TTL high is approximately 2.5V to 5V. The interrupt signal you provide should transition from a low of 0, or ground, to a high of 5V. The procedure initiated by an interrupt is wholly dependent on programming. 3.6 DIGITAL INPUTS & OUTPUTS The PCM-DAC02 has eight bi-directional digital I/O lines. The eight digital lines may be programmed as input or output in groups of: eight inputs, eight outputs or four inputs and four outputs. A register controls the direction of the digital I/O lines and must be set via software. At power on or reset the digital lines default to inputs. Please note: Digital lines in an input state present a high impedance to any device connected to them. The implication is that if you are using a digital line to control the input of a TTL chip, and that digital line turns from an output to an input, the TTL chip being controlled MAY detect the turned around line as a 1 or a 0. This could cause the TTL input being controlled to switch on or off, possibly with consequences for the system you are controlling. To prevent random switching and force all digital lines into a known state on power up or reset, use pull up or pull down resistors to fix the state of the line as either high or low. A properly selected resistor will not interfere with TTL level output signals. For more information on programming the digital I/O lines, please refer to the Universal library programmers manual. 5

10 4 PROGRAMMING & APPLICATIONS 4.1 PROGRAMMING LANGUAGES Universal Library provides complete access to the PCM-DAC02 functions from a range of programming languages; both DOS and Windows. If you are planning to write programs, or would like to run the example programs for Visual Basic or any other language, please turn now to the Universal library manual. 4.2 PACKAGED APPLICATIONS PROGRAMS Many packaged application programs, such as SoftWIRE TM, have drivers for the PCM-DAC02. If the package you own does not appear to have drivers you need, please fax the package name and the revision number from the install disks. We will research the package for you and advise by return fax how to obtain necessary drivers. 6

11 5 CALIBRATION The PCM-DAC02 is hardware calibrated and tested at the factory. All calibration after initial manufacturing is done via software. The calibration factors are stored on the PCM-DAC02 and should be applied through software every time the board is run. Never attempt to open the case since there are no parts inside that you can service. There are no socketed components. If you are using the Universal library, you can set software calibration factors for offset and gain using the Calibration option of InstaCal. These factors will be applied to outputs made by any of the D/A routines called from any of the language libraries of Universal library. You will need a precision calibrated DVM having better than 1/4096 resolution. After calibration factors are set, they are stored in the PCM-DAC02. These calibration factors are accessed by Universal library and InstaCal and applied to any output codes sent to the PCM-DAC02. If you use direct register programming be sure to access and apply the calibration factors. Calibration factors may be reset at any time by running InstaCal calibration. Choose Calibration from the InstaCal menu, and follow the instructions. Press F1 for help. 7

12 6 I/O ADDRESS MAP & REGISTER FUNCTIONS A base address register controls the beginning, or 'Base Address' of the I/O addresses occupied by the control registers of the PCM-DAC02. Seven addresses are occupied. The base address assigned by CSS is stored in the CB.CBG file by InstaCal. CONTROL REGISTERS After CSS is installed and a base address has been established, the PCM-DAC02 can be controlled by writing to and reading from the control registers. While it is possible to write your own control routines for the PCM-DAC02, routines have been written and are available in Universal library for DOS and Windows programming languages. NOTE ON REGISTER PROGRAMMING SUPPORT While the complete register map is explained here, only very limited support for assembly language or direct register programming is available. Register level programming should only be done by experienced programmers. We support the use of the PCM-DAC02 through high level languages using Universal Library. BASE DAC0 LSB Data Register Any write to this register will trigger an A/D conversion. This is a good method of starting conversions from software or time-of-day clock control. WRITE: D/A Data can be written to this address and to Base + 1 to form a 12-bit D/A data word D/A7 D/A6 D/A5 READ: Clears interrupt. D/A4 D/A3 D/A2 D/A1 D/A0 BASE DAC0 MSB (4 bits) WRITE: Send DAC data. & Update outputs of DAC D/A11 D/A10 D/A9 D/A8 READ: Calibration: read status (Busy: 0 = busy, 1 = ready) BASE DAC1 LSB Data Register BUSY

13 WRITE: Same as base + 0 but for second DAC, DAC1. READ: No function D/A7 D/A6 D/A5 D/A4 D/A3 D/A2 1 D/A1 0 D/A0 BASE DAC1 MSB (4 bits) WRITE: Same as base + 1 but for second DAC, DAC1. Updates DAC1. READ: No function D/A11 D/A10 D/A9 0 D/A8 BASE Digital I/O (8 bits) WRITE: Updates output of DIO bits set for output. READ: Reads current status of DIO bits set for input. Reads back output state of DIO bits set for output DIO7 DIO6 DIO5 DIO4 DIO3 DIO2 BASE Calibration Data Load Register WRITE: Load bit for calibration DAC, which is serial load. READ: Writes contents of DATA into the DAC DIO1 1 DIO0 0 DATA For a complete technical description of the calibration procedure please fax your request to Measurement Computing Corp., attention of the Engineering Manager. The details of this procedure are available to any software developer desiring to add a calibration routine for the PCM-DAC02. BASE Control & Status Register WRITE: Loads various control bits, explained below INT_EN UDIR LDIR DAC0R1 DAC0R0 1 DAC1R1 0 DAC1R0 READ: Reads status of various control bits, explained below ET_INT INT_EN UDIO LDIO DAC0R1 DAC0R0 Set DAC Output Range DAC#R1 DAC#R0 ±5V 0 0 ±10V DAC1R1 0 DAC1R0

14 0 to 5V to 10V 1 1 UDIO & LDIO Set the direction of the upper and lower four bits of the digital I/O lines. Set to 1 for output; set to 0 for input. Digital I/O defaults to input on power up INT_EN Enable interrupt from pin 5. Enable = 1. Disable = 0 ET_INT Set to 1 when an interrupt has been detected on pin 5. Interrupt is level only. Interrupt occurs at TTL high (2.5V < TTL High < 5V). Reading base+0 clears this bit. 10

15 7 SPECIFICATIONS Typical for 25 C unless otherwise specified. POWER CONSUMPTION +5V (Normal operation) 48 ma typ, 65 ma max +5V (During CIS read) 65 ma typ, 105 ma max ANALOG OUTPUT D/A converter type AD7837 Dual MDAC Resolution 12 bits Number of channels 2 Output Ranges ±10V, ±5V, 0 to 10V, 0 to 5V, each channel individually programmable D/A pacing Software paced D/A trigger modes Software Data transfer Programmed I/O Offset error (calibrated) Gain error (calibrated) Differential non-linearity (D/A spec) Integral non-linearity (D/A spec) Monotonicity Throughput Slew rate Settling time (to ½ LSB of FSR) Current Drive Output short-circuit duration Output coupling Miscellaneous ±1 LSB ±1 LSB ±1 LSB ±1 LSB Guaranteed monotonic System-dependent 7.2 V/µsec typ 8 µs typ ±2.5 ma 15 ma indefinite DC Double-buffered output latches DIGITAL I/O Digital type FPGA 11

16 Configuration Input low voltage Input high voltage Output low voltage (IOL = 4 ma) Output high voltage (IOH = 4 ma) Absolute maximum input voltage Interrupt Enable Interrupt Source Two ports, four bits each. Programmable as 8 input, 8 output or 4 input and 4 output 0.8V max 2.0V min 0.23V max 3.86V min 0.5V, +5.5V Programmable External (Ext Int), falling edge triggered, cleared by a read of Base + 0 address ENVIRONMENTAL Operating temperature range 0 to 70 C Storage temperature range 40 to 100 C Humidity 0 to 90% non-condensing 12

17 8 PCM-C15-10-INCH CABLE The PCM-C15-10-INCH is a 10-inch 15-pin cable assembly for use with a 15-pin PCMCIA cards. The PCM-C15-10-INCH has a connector on one end and open terminations at the other end for user field wiring. The chart below lists color coding. PIN COLOR Black White Red Green Brown Blue Orange Yellow PIN SHIELD COLOR Purple Gray Lt. Brown Pink White/Blue Blue/White Green/Yellow Bare 13

18 For your notes

19 EC Declaration of Conformity We, Measurement Computing Corporation, declare under sole responsibility that the product: PCM-DAC02 Part Number PCMCIA Dual-Channel Analog Output Board Description to which this declaration relates, meets the essential requirements, is in conformity with, and CE marking has been applied according to the relevant EC Directives listed below using the relevant section of the following EC standards and other normative documents: EU EMC Directive 89/336/EEC: Essential requirements relating to electromagnetic compatibility. EU Class B: Limits and methods of measurements of radio interference characteristics of information technology equipment. EN : EC generic immunity requirements. IEC 801-2: Electrostatic discharge requirements for industrial process measurement and control equipment. IEC 801-3: Radiated electromagnetic field requirements for industrial process measurements and control equipment. IEC 801-4: Electrically fast transients for industrial process measurement and control equipment. Carl Haapaoja, Director of Quality Assurance

20 Measurement Computing Corporation 16 Commerce Boulevard, Middleboro, Massachusetts (508) Fax: (508)