UCD9090A: Don't work

Hirotsugu Kobayashi

Mastermind 9530 points

Part Number: UCD9090A
Other Parts Discussed in Thread: UCD9090, UCD90SEQ48EVM-560

Hi, team.

UCD9090 does not work.

But It works when connected to the tool and starts the GUI.

No operation on GUI, just connected.

What is the cause?

Best Regards,

over 5 years ago

0 yihe over 5 years ago

TI__Guru 65610 points

Hello

Based on what you described, it seems that device was stuck at ROM mode.

Please check bullet 3 of section 8.2.1 of https://www.ti.com/lit/ds/symlink/ucd9090a.pdf.

You can follow the attachment to exist the ROM mode.

8080.recover UCD9090A from ROM mode.pdf

Regards

Yihe

0 Hirotsugu Kobayashi over 5 years ago in reply to yihe

Mastermind 9530 points

Thank you Yihe.
It was solved by writing the checksum.

However, it is unknown why the ROM mode has been set.
What are the conditions for entering ROM mode?

Best Regards,

0 yihe over 5 years ago in reply to Hirotsugu Kobayashi

TI__Guru 65610 points

Hello

Please read data sheet section 8.2.1 bullet 3.

Regards

Yihe

0 user3627298 over 5 years ago in reply to yihe

Prodigy 20 points

Hello

I wrote to the UCD9090 using an evaluation board (UCD90SEQ48EVM-560).
After attaching the written chip to the board, a problem occurred.

The questions are listed below, can you check them?

1.Attach the writing method(1.pdf) we did.Is this writing method OK?
2.The chip that had the problem had a checksum of 0.Under what conditions will the checksum be 0?(2.PNG)
3.After regenerating the checksum, it become 3.PNG. Is checksum OK?
4.We have been writing on board UCD9090 until now.
There was no problem at this time.
Does this problem occur when the chip written on the evaluation board is mounted on another board?

7065.1.pdf

0 yihe over 5 years ago in reply to user3627298

TI__Guru 65610 points

Your programming methods are good. The reason why checksum is zero is that a special command(ROM_COMMAND) was issued from application to erase the checksum. This forces the devices into ROM mode. you can regenerate the checksum to bring the device out of ROM mode.

Regards

Yihe

0 user3627298 over 5 years ago in reply to yihe

Prodigy 20 points

Thank you for your reply.

I have a more questions.

1.Is there a special command (ROM_COMMAND) sent from the application in the writing procedure?
Can you check the program?

20181231_UCD9090_sequence.xml

2.After regenerating the checksum, it become below picture. Is checksum OK?

0 yihe over 5 years ago in reply to user3627298

TI__Guru 65610 points

The ROM_COMMAND is not part of the normal configuration, but as mentioned in the data sheet, the i2c signal integrity may change the commands.

If you follow the recover from ROM mode document, after regenerating the checksum, the device is back to program mode. you can click DEVICE_ID scan mode to confirm this.

Regards

Yihe

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UCD9090A: Don't work