How to Change Resistance Value on AD5260 Digital Potentiometer via Serial Interface?

Hello, I'm new at this IC.
So, I am confused on how to programmed it.
I have Digital Potentiometer AD5260. It's a versatile memory, so it sets up on midpoint. I don't know how to change the resistance value.
I need it to be able to be programmed from min value to max value in certain times.
This is the link to the datasheet.
"Your text to link here...(Datasheet)":http://www.analog.com/en/digital-to-analog-converters/digital-potentiometers/ad5260/products/product.html

In the datasheet described the protocol programming. Uses a simple not addressable protocol.

(Idle state is #CS=1)

Possible pure software MCU pins-changing sending.

Prepare to sending:
* set #CS=0
* delay 5 ns (if need)

Now, send byte-value bit by bit (from MSB to LSB = 7,6,5,4,3,2,1,0) in such way:

NextBit:
* value of current bit set to the SDI (with the MCU command "rotate via Carry Flag"
* CLK=1
* delay 10 ns (if need)
* CLK=0
* delay 10 ns (if need)

repeat with the _next_ bit to NextBit label.

Make lock sended value & go to idle state:
* #CS=1

Also possible hardware SPI sending.

What the CPU/MCU You are using to drive the AD5260?

I used Arduino UNO as Microcontroller.

The connection is like this:
The pin is connected to:
Pin1 -A- +15Volt
Pin2 -W- Output
Pin3 - B- Ground
Pin4 -VDD- +15Volt
Pin5 -SHDN- +15Volt
Pin6 -CLK- Pin 13 Arduino
Pin7 -SDI- Pin 11 Arduino
Pin8 -CS- Pin 10 Arduino
Pin9 -PR- +15Volt
Pin10 -GND- Ground
Pin11 -VSS-Ground
Pin12 -VL- +5Volt
Pin13 -NC-No Connect
Pin14 -SDO-Pin 12 Arduino

And the code is like this:
#include "SPI.h" // necessary library
int ss=10; // using digital pin 10 for SPI slave select
int del=200; // used for various delays

void setup()
{
pinMode(ss, OUTPUT); // for SS pin
SPI.begin(); // wake up the SPI bus.
SPI.setBitOrder(MSBFIRST);
//ent MSB (most significant byte) first
}

void setValue(int value)
{
digitalWrite(ss, LOW);
SPI.transfer(0); // send command byte
SPI.transfer(value); // send value (0~255)
digitalWrite(ss, HIGH);
}

void loop()
{
for (int a=0; a=0; --a)
{
setValue(a);
delay(del);
}
}


But it won't work according the program.
The output is still in midpoint.

You must using the corect for the AD5260 mode of SPI (CPOL, CPHA):
void setup()
{
...
SPI.SetDataMode(SPI_MODE2)
}

AD5260 without autodetect SPI mode, use fixed mode.

CPOL CPHA

H

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I've tried it, but it still didn't work,

I've tried the same program above in AD8402, it works fine.
But it didn't work here,
Is there any possibility that i connected the pin wrong?

Thanks for your advice Mark,
I would like to learn about it more,
But the problem is the deadline is coming up,
So I need to finish it as fast as posssible.
Back theb, I didn't have anything to worry because it works,
But all of sudden it didn't work anymore.
I'm confuse because I use the same program back then.

I would like to learn about it when the chaos is calming down though.

You are *basically correct* connected Arduino to the AD5260.
Properly connected SPI-lines and other.
Except MISO

[code lang="cpp" line="none"]#include "SPI.h"
int ss=10;

void setup()
{
pinMode(ss, OUTPUT);
SPI.begin();
SPI.SetDataMode(SPI_MODE2)
SPI.setBitOrder(MSBFIRST);
}

void setValue(int value)
{
digitalWrite(ss, LOW);
SPI.transfer(value);
digitalWrite(ss, HIGH);
}

void loop()
{
for (int a=0; a

Ah, it did works, but the output isn't linear and unstable,
it's going up and down. After 15 Volt, it supposed to go back to 0 Volt, but, instead it going down to 14, then going up again to 15, then to 1.57, to 0.90, 2,60, kinda like that.
Sorry for my poor explanation.

Try SPI MODE3:


8

Oh, it did work,
But in the end, after the output is14.38, the output shows another random output (like 0.47, 1.,2, 9.4, 5.8, etc), and then 0.12.
Other than that, the output is linear.
Is there some glitch or something like that?

Oh, right, though SDHN and PR connected to 15Volt, it still works, and it still need delay for the program to work.

Nope, I plot it in Excel.

When You make the table of output voltages a few times, the results is same or flow?
Schematic is same as above?

So, You are use the AD5260 as resistance voltage divider. +15V is strong stabilized?
You are measure Output (W) when W is under LOAD or without LOAD?
If under LOAD, You must to buffering output with the OpAmp (follower), like on the schematic.

Schematic.

Or use the DigitalPOT as OpAmp gain control:

According to datasheet, the #SHDN & #PR (all digital inputs) is internally protected by R + Zener's diode.
So, connecting the #SHDN & #PR to the +15V is accept.

w

Sorry for being late in giving reply.
I need to finish my paper first.
I deeply apologized.

The result is same, the different one is just the random value which appeared at that point.
But when I try to give the different source for input,
It works just fine.

What do you mean by strong stabilize?

If I did as the schematic as above, did it mean the digital potentiometer works as voltage divider?
If I wanted to use it as LOAD for photovoltaic, what I have to do?
I tried to connect the positive of PV to W, and A is NC.
But it didn’t work.