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I am using 7124-4.

Question asked by hahmin on Jan 14, 2017
Latest reply on Jan 18, 2017 by hahmin

Hello,

 

I made same board from CN0376-SDPZ REV B. 

 

When I get a thermocouple value from that boad, I have to use cold junction temperature.

 

The CN0376-SDPZ has NTC thermister. When I use software from ANALOG DEVICE, I can get the cold junction

 

temperature. The NTC thermister is connected through AIN5, AIN6. 

 

so, I transmitted setting packets. like this:

 

0x0A, 0x10, 0xA6      (CHANNEL-1)

after delay 10ms,

0x1A, 0x01, 0xF7      (CONFIG-1)

after delay 10ms,

0x22, 0xE6, 0x07, 0xFF (FILTER-1)

after delay 10ms,

0x03, 0x00, 0x12, 0xA0 (IO_CONTROL1)

after delay 10ms,

0x04, 0x80, 0x00 (IO_CONTROL2)

 

And when I send this message ( 0x01, 0x01, 0x84  and 0x42, 0x00, 0x00, 0x00).

I got some datas from the 7124-4.

 

But the value is strange.

When I put 0 ohm, and 10K ohm instead of the NTC thermister.

The value have to change between 0 ohm and 10K ohm. But the value is nearly same.

 

I guessed my sending message was wrong.

 

If I get a right value from ad7124-4, what do i send messages?

 

help me.

 

Thank you for reading my question. ( I am sorry my foolish English). 

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