No Programming Skill or Programming Language Required!

Transcription

1 A573 One Time Programmable igital Potentiometer Evaluation Board User Manual ev. A 8/0/0 6 STEPS TO SETUP THE EVALUATION BOA. Install A573 Software. Install NTPOT.OCX 4. Open A573 ev A.exe and program resistance settings 5. Provide Power Supply +5V GN W 3. Connect B5M-8P8C Adapter to Parallel Port. Connect 8P8C cable to eval board J45 connector B 6. Measure esult Figure. Evaluation Kit Setup No Programming Skill or Programming Language equired!

2 STEPS FO OPEATING A573 EVALUATION KIT. Installing A573 ev A Evaluation Software a. un setup.exe under :\A573 Evaluation Board A\Package b. uring the installation, hit ignore or yes to bypass error messages if they occur. (Users may need to install the s/w few times to get successful installation). Steps For Enabling PC Parallel Port Communications (In addition to installing A573 ev A, users need to install a 3 rd party driver, NTPOT.OCX from UCT, to gain access of the PC parallel port. UCT offers a free trial of such driver) a. Unzip ntport.zip from the C om. If ntport.zip cannot be found, download it from Click ownload NTPOT.OCX, Click NTPOT free trial (user is obligated to pay a nominal license fee after 30 days free trial) b. Save ntport.zip in default or specified directory c. unzip and extract all to the specified directory d. un setup.exe e. If it prompts file violations during installation, hit Ignore to bypass it. f. The following instructions are for users running Windows 000 and XP (For Win NT, skip and jump to step g) Users must ensure the file LPOTIO.SYS is placed in Winnt\system3\drivers or Windows\system3\drivers directory.. un LOAV.EXE under c:\program files\project or the specified directory. A dialog box will appear as (Error Message: if windows prompts you some error messages such as Can t connect to service control manager, you need to contact the IS department to grant you an authority for further installation). Change pathname to c:\winnt\system3\drivers\dlportio.sys. (For Windows 000) c:\windows\system3\drivers\dlportio.sys. (For Windows XP) 3. Hit Install button, then Start button. If the status message states successful, the driver is installed and operating. Click OK button. 4. Go to evice Manager (For Windows 000, go to Control Panel Systems Hardware evice Manager, For Windows XP, go to System Properties Hardware evice Manager)

3 5. The Non-Plug and Play ivers entry may not be visible at first. If not, click on the View menu item in evice Manager and click on View Hidden evices to make sure that hidden driver files are listed. Then it should be visible. (Note: If you do not see dlportio, reboot windows or redo LOAV.EXE and then reboot windows.) 6. From the non-plug and play drivers list in evice Manager locate the dlportio device and double-click. 3

4 7. The dlportio properties page for the driver will be shown. At river tab, select Current Status as Start and Startup Type as AUTOMATIC. (Note: If Startup is not active and you cannot change Type, your computer may be administered by your IS department. You may need to consult them to change your PC administrative setting) 4

5 g. The following instructions are for users running Windows NT only Users must ensure that the file: LPOTIO.SYS is placed in the Winnt\system3\drivers directory. In order to load the LPOTIO.SYS driver; use the driver loader program LOAV.EXE. Open c:\program files\project\loaddrv.exe A dialog box will be appear as (Error Message: if windows prompts you some error messages such as Can t connect to service control manager, you need to contact the IS department to grant you an authority for further installation). The pathname for LPOTIO.SYS must be changed accordingly to the following operating systems: c:\winnt\system3\drivers\dlportio.sys 3. Hit Install button, then Start button. If the status message states successful, the driver is installed and operating. Click OK button. 4. Automatic river Loading Under Windows NT Once the LPOTIO.SYS driver has been installed and run on an NT system it can be made to start automatically every time NT is started. To place the driver into this mode select the EVICES icon from the Windows NT Control Panel. From evices dialog box that will appear select dlportio and click on the Startup... button 5

6 5. The device Startup Type dialog box will be shown as illustrated below. From the option buttons select Automatic. The driver will now automatically start each time that Windows NT is restarted. Note ue to the large variations in computer platforms and configurations, Analog evices, Inc. cannot guarantee this software to work across all systems. Should you encounter problem, you may consult or call for application support. Uninstall To uninstall A573 and NTPOT, use Add/emove Programs in Control Panel 6

7 3. Connect B5M-8P8C Adapter to PC Parallel Port, Connect 8P8C Network Cable from Adapter to Eval Board 4. Apply +5V between V and AGN 5. Open A573 ev A program from Windows Start Program. Move scroll bar to program resistance settings. The operation are self-explanatory. Figure. A573 Software Graphic Interface 6. Measure resistance across W-B or W-A (ual opamp A8 U3 and.5v reference A03 U4 are provided to facilitate further evaluations. U3A can be configured with A573 in various building block configurations, see appendix. To use U3, either connect JP3 and JP4 to make V+ and V- equal to V and AGN respectively or connect JP5 and JP6 and apply V+ and V- to no more than +/-5V for higher voltage applications. A573 is low power device, but V is connected to the voltage reference U4 such that the total supply current is about 0.65mA). JP5 VCC On Board.5V eference JP3 V V C4 0.u 3 U4 Temp Trim GN Vin Vout A C5 0.u VEF CP3 CP -IN -IN C6 0.u CP4 CP V+ C7 0u JP V J J45 V SCL C 0u SA 0k 0k C 0.u 3 4 U W A V B GN A0 SCL SA A570 Figure 3. Evaluation Board Schematic C3 0.u 3 4 U W A V B GN A0 SCL SA A57/A573 igital Pot Section A W B JP AGN Vin JP8 JP7 +IN IN V- CP5 -IN +IN 6 5 JP4 JP6 U3B U3A 7 OUT CP6 C8 0.u On Board ual Opamp CP7 C9 0u VEE OUT OUT 7

8 APPENIX Applications The A573 evaluation board comes with dual opamp A8 and.5v reference A03. Users can configure the various building blocks circuits with minimum components. In the schematics, JP and CP stand for jumper and connection point respectively. The black color arcs are on-board jumpers and red color arcs require hard wiring. Vo =.5V 64 Figure A. Programmable-Voltage Output. Vo = WB AB.5V Figure A. Fine-Voltage Adjustment. If Vin > Vw, Vo = V, 0 Otherwise Vw =.5V 64 8

9 Figure A3. Level etector. Vo = Vi 63 Figure A4. Pseudo Log Inverting Gain and Attenuator Vo = ( + ) Vi 64 Figure A5. Pseudo Log Non-inverting Gain. AB Vo = ( ) Vi 64 Figure A6. Inverting Linear Gain. 9

10 AB Vo = ( + ) Vi 64 Figure A7. Non-inverting Linear Gain. < < + Vo Vi Figure A8. Bipolar Linear Gain 0

11 Vo =.5V 64 (00mA max) Figure A9. Programmable.5V Power Supply. Vo = ( + (00mA max) ).5V 64 Figure A0. Programmable Power Supply.5V IL = 64 SET Figure A. Programmable-Current Source.

12 o G = 80 tan ( ω WB C) Figure A. Phase Shifter. Vo = k I k = + WB + WB Figure A3. High Sensitivity Photodiode etector

13 PCB LAYOUT, GOUNING, and POWE SUPPLY BYPASSING CONSIEATION Figure A7. Top Overlay. Figure A4. Evaluation Board. Figure A5. Top Layer It is a good practice to bypass the power supplies with quality capacitors for optimum stability. Supply leads to the device should be bypassed with 0.0uF-0.uF disc or chip ceramics capacitors. Low-ES uf to 0 uf tantalum or electrolytic capacitors should also be applied at all supplys to minimize any transient disturbance and filter low frequency ripple, Figure A8. Similarly, it is a also a good practice to employ compact, minimum-lead length layout design. The leads to the input should be as direct as possible with a minimum conductor length. Ground paths should have low resistance and low inductance. Separate ground plane for multi-layers board is ideal or maximize ground plane as much as possible in two layers board, Figures A5 and A6. The ground pin of the A573 device is digital ground reference. To minimize the digital ground bounce, the A573 ground terminal should be joined remotely to the analog ground at a single point, Figure A8. A573 Figure A8. Power Supply Bypassing. igital Ground and AGN connection. Figure A6. Bottom Layer 3

14 A573 Parallel Port Connection (Information for Visual Basic Program evelopers Only) SCL SA_Write GN SA_ead 8 output pins accessed via the ATA Port (NTPOT.Address = 888) 5 input pins (one inverted) accessed via the STATUS Port 4 (NTPOT.Address = 889) 4 output pins (three inverted) accessed via the CONTOL Port (NTPOT.Address = 890) The remaining 8 pins are grounded TIMING EFINATION IN VISUAL BASIC SOUCE COE cmdun (Information for Visual Basic Program evelopers Only) bit (Pin 3) SCL bit 0 (Pin ) SA Binary Code ecimal Code No Activity Send out BIT_TOGO= Send out BIT_TOGO=0 Latch ata 4