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Topic: Wiring the digital potentiometer AD5280 (again!) (Read 81 times) previous topic - next topic

c0rsa1r

Apr 20, 2017, 12:53 pm Last Edit: Apr 20, 2017, 02:12 pm by c0rsa1r
Hi all, I would use again this 50k i2c digipot; this time, I have a LED driver that provides me 2 pin for external regulation.

The datasheet says: "You can use a 50k potentiometer or a 0-10v control voltage".

Now, since there are only 2 pins ("1/10V+" and "1/10V- GND") I suppose that the potentiometer must be used in rheostat mode, ence only A (or B) and W would be used.

Using Arduino UNO r3, 50k digipot AD5280 datasheet

pin1 = A = 1/10V+
pin2 = W = "1/10V- GND
pin3 = B = not connected
pin4 = Vdd = (I don't know? Maybe 1/10V+? Or 5?)
pin5 = SHDN = 5V
pin6 = SCL
pin7 = SDA
pin8 = GND
pin9 = GND
pin10 = GND
pin11 = GND
pin12 = not connected
pin13 = 5V
pin14 = not connected

(4.7k pull-up resistor on both i2c pins, pin 8-9 are tied to GND for the i2c addres)

Are those wirings correct? Any help would be really appreciated!

Thank you!

UPDATE:

Reading the AD5290 datasheet

A - Terminal. VSS ≤ VA ≤ VDD
B - Terminal. VSS ≤ VB ≤ VDD

Does it mean (supposing the AD5280 works the same as the AD5290) that I could provide 12V to Vdd?
"The S2000 is nothing so much as a legend in its own time. If you don't like it, you probably haven't driven it hard enough." - Car culture

knut_ny

Ny

c0rsa1r

Looks correct.. also the 12V for Udd
12v even if the interface of the driver it's a 0-10v?

thank you knut_ny
"The S2000 is nothing so much as a legend in its own time. If you don't like it, you probably haven't driven it hard enough." - Car culture

knut_ny

The datasheet doesnt indicate otherwice.   I believe: yes. even with 0..10V driver
Ny

c0rsa1r

The datasheet doesnt indicate otherwice.   I believe: yes. even with 0..10V driver
Perfect, it does indeed work! Thank you!
"The S2000 is nothing so much as a legend in its own time. If you don't like it, you probably haven't driven it hard enough." - Car culture

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