TPL0401A-10-Q1: READ data is different from WRITE data

Tomoaki Yoshida91

Genius 5255 points

Part Number: TPL0401A-10-Q1

Hi team,

I have a problem similar to the thread below.

https://e2e.ti.com/support/interface/f/138/t/499997?tisearch=e2e-sitesearch&keymatch=TPL0401A

In the read immediately after writing, the written value can be read.

After that, when only the read instruction is executed, the return value is always 0x7F.

Are there any restrictions on the execution of read instructions?

Best regards,

Tomoaki Yoshida

over 6 years ago

0 Uttam Sahu over 6 years ago

TI__Genius 14220 points

Hi Tomosaki-san,

Thank you for your query. What does the resistance output correspond to: 0x7F or your written code?

Do you have a scope shot of your waveforms?

Regards,

Uttam Sahu

Applications Engineer, Precision DAC

0 Tomoaki Yoshida91 over 6 years ago in reply to Uttam Sahu

Genius 5255 points

Hi Uttam-san,

Thank you for your support.

Various writing values are tried, but all become 0x7F as well.

When the resistance value is measured, it becomes the set value, but it seems that I2C read is not good.

Can I send waveform to you directly?

Best regards,

Tomoaki Yoshida

0 Uttam Sahu over 6 years ago in reply to Tomoaki Yoshida91

TI__Genius 14220 points

Hi Tomoaki-san,

Please send the scope shots over email. You can upload here as well if there is no confidentiality.

Regards,

Uttam

0 Tomoaki Yoshida91 over 6 years ago in reply to Uttam Sahu

Genius 5255 points

Hi Uttam-san,

I sent scope shots by private message.

Please tell me, if you have not received message.

Best regards,

Tomoaki Yoshida

0 Uttam Sahu over 6 years ago in reply to Tomoaki Yoshida91

TI__Genius 14220 points

Closing this thread as I have moved the discussion to email.

Regards,

Uttam

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TPL0401A-10-Q1: READ data is different from WRITE data