AD5258EVAL

64/256-Position I2C Compatible Nonvolatile Memory Digital Potentiometer Evaluation Board User Manual AD5258/AD5259 5 Steps to Setup The Evaluation Board… 1. Install AD5258 / AD5259 3. Open AD5258/59Eval_RevX.exe 2. Configure Board and connect to Parallel Port with Provided Connector and Cable +5V W AGND B 4. Use Computer’s Supply or Provide Power Supply 5. Measure Result Figure 1. Evaluation Kit Setup No Programming Skills Required! Rev. C 11/23/04 64/256-Position I2C Compatible Nonvolatile Memory Digital Potentiometer Evaluation Board User Manual AD5258/AD5259 General Overview This evaluation board provides the user with a simple and quick solution to evaluate digital potentiometers from Analog Devices. How to Get Started 1. Load the CD and click on setup.exe. 2. Use power from the parallel port or apply an external power supply(refer to “Powering Options” to avoid damaging the part and computer port). 3. Connect board to parallel port with the provided connector and cable. 4. Open the AD5258/59Eval_RevX program from the Windows Start menu. Powering Options A. Using the power from the parallel port. 1. Connect JPVDD jumper. This will power VDD. 2. Connect JPVLOGIC jumper. This will power VLOGIC. B. Using an external power supply(supply must be at least +2.7V)* 1. DO NOT connect JPVDD and JPLOGIC jumpers. 2. Connect JPPOWER jumper. 3. Connect voltage supply power and ground to the VDD and GND pads on the board. *If two independent supplies are being for VDD and VLOGIC, do not connect JPPOWER. Simply apply the two power supplies to VDD, VLOGIC, and GND pads on the board. How to Use Software Interface 1. In the ‘Enter Data’ box, either type in the value, use the scroll bar, or click a preset button. Note that this is simply a data entry box and does not perform any function on the digital potentiometer device. Communication with the device occurs in Steps 2 and 3. 2. In the ‘Write/Restore/Store’ box… i. ii. iii. iv. 3. Click on ‘Write to RDAC’ to write value chosen in Step 1 to the RDAC. Click on ‘Write to EEMEM’ to write value chosen in Step 1 to the EEMEM. Click on ‘Restore EEMEM Content to RDAC’ to restore current EEMEM content to RDAC. Click on ‘Store RDAC Content to EEMEM’ to store current RDAC setting to EEMEM. In the ‘Read Data’ box… i. Click on ‘Read from RDAC’ to read back current setting of RDAC. ii. Click on ‘Read EEMEM’ to read back current content of EEMEM. iii. Click on ‘Read Tolerance’ to read back the tolerance of the resistance RAB. For example, if the device is the device is a 10kΩ option and the tolerance readback is 3.5%, that would mean the actual value of RAB = 10,350Ω. Rev. C 11/23/04 64/256-Position I2C Compatible Nonvolatile Memory Digital Potentiometer Evaluation Board User Manual AD5258/AD5259 Figure 2. AD5259 Software Graphical Interface Figure 3. Evaluation Board Top Overlay. Rev. C 11/23/04 64/256-Position I2C Compatible Nonvolatile Memory Digital Potentiometer Evaluation Board User Manual AD5258/AD5259 1 2 3 VLOGIC VDD JPPOWER J1 C2 C1 13 25 12 24 11 23 10 22 9 21 8 20 7 19 6 18 5 17 4 16 3 15 2 14 1 D C DGND joints AGND at one point in PCB 10u 10u DGND AGND * JPVDD * JPVLOGIC R7 100 R1 2.2k R4 2.2k R3 2.2k R2 2.2k SCL W R6 U2 100 R5 1 2 3 4 5 6 7 100 SDA_W SDA_R DB25 U1 1A 1Y 2A 2Y 3A 3Y GND 14 13 12 11 10 9 8 VCC 6A 6Y 5A 5Y 4A 4Y 1 2 3 4 5 W AD0 AD1 SDA SCL AD5258/AD5259 SN74HC05 SCL_MON SDA_MON C6 0.1u * Jumper Defaults ON U3 1 2 3 4 A0 A1 A2 GND 8 7 6 5 VCC WP SCL SDA AT24C02 V+ B JPV+ C3 C7 10u 0.1u JPBUFFER Cc -IN JP3 Rfb Rin 1 JP2 2 JP1 3 4 +IN NC NC -IN V+ +IN OUT NC V- U4 8 7 6 OUT 5 AD8531/OP1177 C8 A C4 JPGND 0.1u 10u V- 1 2 Figure 4. Evaluation Board Schematic W 1 AD0 2 10 A AD5259 9 B AD1 3 8 VDD TOP VIEW SDA 4 (Not to Scale) 7 GND SCL 5 Figure 5. Pinout Rev. C 11/23/04 6 VLOGIC A B VDD GND Vlogic 3 10 9 8 7 6 A B C5 0.1u 64/256-Position I2C Compatible Nonvolatile Memory Digital Potentiometer Evaluation Board User Manual AD5258/AD5259 Parallel Port Connection (Information for Visual Basic Program Developers Only) VLOGIC SHDN VDD RES/AD1 CS/AD0 CLK/SCL SDI/SDA DGND SDO/O1 SDA_Read http://www.doc.ic.ac.uk/~ih/doc/par/ 8 output pins accessed via the DATA Port 5 input pins (one inverted) accessed via the STATUS Port 4 output pins (three inverted) accessed via the CONTROL Port The remaining 8 pins are grounded bit 1 (Pin 3) bit 0 (Pin 2) portID = Val("&H" + "378") [378h = 888] portID = Val("&H" + "379") [379h = 889] portID = Val("&H" + "37A") [37Ah = 890] SCL SDA Binary Code 1100 1001 1011 1000 1010 Decimal Code 12 No Activity Rev. C 11/23/04 9 11 Send out BIT_TOGO=1 8 10 Send out BIT_TOGO=0 1100 12 Latch Data