Analog Devices AD5258 User manual

64/256-Position I2C Compatible
Nonvolatile Memory
Di
g
ital Potentiomete
r
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
B
W
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
Di
g
ital Potentiomete
r
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
Di
g
ital Potentiomete
r
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
Di
g
ital Potentiomete
r
Evaluation Board User Manual AD5258/AD5259
Rev. C 11/23/04
1 2 3
321
D
C
B
A
JP3
R1
2.2k R2
2.2k
JPGND C8
0.1u
C1
10u
C4
10u
C5
0.1u
JPV+ C7
0.1u
C3
10u
VDD
A
W
B
V+
V-
-IN
+IN
OUT
Rin Rfb
Cc
JPVDD
SCL_MON
JP1
DGND j oint s AGND at one poi nt i n PCB
*
* Jumper Defaults ON
W
1
AD0
2
AD1
3
SDA
4GND 7
VDD 8
B9
A10
SCL
5Vl og i c 6
U1
AD5258/AD5259
JPBUFFER
NC
1
-IN
2
+IN
3
V-
4NC 5
OUT 6
V+ 7
NC 8
U4 AD8531/OP1177
JP2
1A
1
1Y
2
2A
3
2Y
4
3A
5
3Y
6
GND
74Y 8
4A 9
5Y 10
5A 11
6Y 12
6A 13
VCC 14
U2
SN74HC05
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
J1
DB25
A0
1
A1
2
A2
3
GND
4SDA 5
SCL 6
WP 7
VCC 8
U3
AT 24C02
R3
2.2k R4
2.2k
SCL
SDA_W
R7
100
VL OGI C
SDA_MON
JPVLOGIC
*
JPPOWER C2
10u
C6
0.1u
AGND
DGND
R5
100
R6
100
SDA_R
Figure 4. Evaluation Board Schematic
Figure 5. Pinout
1
2
3
4
5
10
9
8
7
6
W
AD0
AD1
SDA
SCL
AD5259
TOP VIEW
(Not to Scale)
A
B
VDD
G N D
VLOGIC

64/256-Position I2C Compatible
Nonvolatile Memory
Di
g
ital Potentiomete
r
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