LM8342: Application issue for LM8342

April Jiang

Intellectual 830 points

Part Number: LM8342

Hi colleague,

My customer meet some issues when using LM8342, could you please help to review if the SCH is ok for LM8342? Thanks.

One is that LM8342 download code with another IC at the same time ,code download failed. Circuit as follows case 1:
Based on the above problems, we do experiments as follows case 2, when change LM342 to another IC such as IML7972,code download OK.

over 5 years ago

0 Aaron Goodson over 5 years ago

TI__Expert 6330 points

Hi April,

I have notified our expert regarding this topic. Please expect a response by 9/25/18.

Thanks,
Aaron

0 Liaqat Khan over 5 years ago in reply to Aaron Goodson

TI__Mastermind 18550 points

Hi April,
Schematics looks good to me. The 4.7K ohm I2C pull up resistors are not shown int he schematics but I assume that they are there are are pulled up the same level as VDD input supply of LM8342.
The only issue I can think of is that perhaps internal pull down resistor on WPN pin is not fully pulling that signal down. Can you please experiment by connecting the WPN pin 3 to GND to see if it has any impact?
Kind Regards,
Liaqat

0 April Jiang over 5 years ago in reply to Liaqat Khan

TI__Intellectual 830 points

Thanks very much, Khan, Will check ASAP, any update , will let you know.

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LM8342: Application issue for LM8342