AnsweredAssumed Answered

AD7124 Dout level

Question asked by hahmin on May 6, 2016
Latest reply on Jan 12, 2017 by hahmin

HELLO,

 

I want to use ad7124-4. So I bought the EVAL-CN0376-SDPZ boad. And I'm testing.

 

Firstly, I use the the EVAL hardware, and I want to control this device through STM320F28335.

 

SPI pin's /CS, MOSI, MISO, CLK are connected.

 

I set channel, config, filter, error, adc as follows.

 

channel

0x09, 0x90, 0x23

 

config

0x1A, 0x09, 0xF7

 

filter

0x22E6, 0x07FF

 

error

0x07, 0x00, 0x00, 0x68

 

adc

0x01, 0x01, 0x84

 

final read action as follows:

0x42, 0x00, 0x00, 0x00

 

But, the Dout level from AD7124 is too low. So the 28335 could not read the data well.

I just see gabage datas...

 

I attach the scope picture when I read the datas.

AD7124.JPG

yellow line: /CS,

green line: CLK,

blue line: SDI (MOSI)

pupple line: SDO (MISO)

 

the SDO data from AD7124 is too low..

 

What did I do wrong?

 

 

I waiting for apply..

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