Analog Devices AD5258 Manual de usuario

64/256-Position I2C Compatible

Nonvolatile Memory

ital Potentiomete

Evaluation Board User Manual AD5258/AD5259

Rev. C 11/23/04

5 Steps to Setup The Evaluation Board…

5. Measure Result

4. Use Computer’s Supply

or Provide Power Supply

AGND

+5V

1. Install AD5258 / AD5259

3. Open AD5258/59Eval_RevX.exe

2. Configure Board and

connect to Parallel Port

with Provided

Connector and Cable

Figure 1. Evaluation Kit Setup

No Programming

Skills Required!

64/256-Position I2C Compatible

Nonvolatile Memory

ital Potentiomete

Evaluation Board User Manual AD5258/AD5259

Rev. C 11/23/04

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. Click on ‘Write to RDAC’ to write value chosen in Step 1 to the RDAC.

ii. Click on ‘Write to EEMEM’ to write value chosen in Step 1 to the EEMEM.

iii. Click on ‘Restore EEMEM Content to RDAC’ to restore current EEMEM content to RDAC.

iv. Click on ‘Store RDAC Content to EEMEM’ to store current RDAC setting to EEMEM.

3. 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 10kΩoption and the tolerance readback is 3.5%, that would mean the actual

value of RAB = 10,350Ω.

64/256-Position I2C Compatible

Nonvolatile Memory

ital Potentiomete

Evaluation Board User Manual AD5258/AD5259

Rev. C 11/23/04

Figure 2. AD5259 Software Graphical Interface

Figure 3. Evaluation Board Top Overlay.

64/256-Position I2C Compatible

Nonvolatile Memory

ital Potentiomete

Evaluation Board User Manual AD5258/AD5259

Rev. C 11/23/04

1 2 3

321

JP3

2.2k R2

2.2k

JPGND C8

0.1u

10u

0.1u

JPV+ C7

0.1u

10u

VDD

V+

V-

-IN

+IN

OUT

Rin Rfb

JPVDD

SCL_MON

JP1

DGND j oint s AGND at one poi nt i n PCB

* Jumper Defaults ON

AD0

AD1

SDA

4GND 7

VDD 8

A10

SCL

5Vl og i c 6

AD5258/AD5259

JPBUFFER

-IN

+IN

V-

4NC 5

OUT 6

V+ 7

NC 8

U4 AD8531/OP1177

JP2

GND

74Y 8

4A 9

5Y 10

5A 11

6Y 12

6A 13

VCC 14

SN74HC05

DB25

GND

4SDA 5

SCL 6

WP 7

VCC 8

AT 24C02

2.2k R4

2.2k

SCL

SDA_W

100

VL OGI C

SDA_MON

JPVLOGIC

JPPOWER C2

10u

0.1u

AGND

DGND

100

SDA_R

Figure 4. Evaluation Board Schematic

Figure 5. Pinout

AD0

AD1

SDA

SCL

AD5259

TOP VIEW

(Not to Scale)

VDD

VLOGIC

64/256-Position I2C Compatible

Nonvolatile Memory

ital Potentiomete

Evaluation Board User Manual AD5258/AD5259

Rev. C 11/23/04

Parallel Port Connection (Information for Visual Basic Program Developers Only)

VLOGIC

SHDN VDD RES/AD1 CLK/SCL

CS/AD0 SDI/SDA

SDO/O1

DGND

SDA_Read

http://www.doc.ic.ac.uk/~ih/doc/par/

8 output pins accessed via the DATA Port portID = Val("&H" + "378") [378h = 888]

5 input pins (one inverted) accessed via the STATUS Port portID = Val("&H" + "379") [379h = 889]

4 output pins (three inverted) accessed via the CONTROL Port portID = Val("&H" + "37A") [37Ah = 890]

The remaining 8 pins are grounded

SCL

SDA

1100 1001 1011 1000 1010 1100

12 9 11 8 10 12

Binary Code

bit 1

(

Pin 3

)

bit 0

(

Pin 2

)

Decimal Code

No Activity Send out

BIT_TOGO=1

Send out

BIT_TOGO=0

Latch Data

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