AIC3204 DVdd Over Current

Bill Finger

Other Parts Discussed in Thread: TLV320AIC3204

I have a product design with the AIC3204, where about 5% of the boards report an over current on DVdd (Page 1, Register 2, Bit 2). I could just ignore this bit, but I am worried that it is a symptom of a larger problem.

I have a few questions.

1) What is the current threshold to trip this bit?

2) What can I do to reduce the current so as not to cause the trip?

I am powering LDO_IN and IOVdd, but relying on the AIC to power AVdd and DVdd. Each of these is bypassed by 10.1 uF.

Thanks,

Bill

over 9 years ago

0 Luis Fernando Rodriguez S. over 9 years ago

TI__Guru* 84915 points

Hello, Bill,

1) The current has a range from 0 to 50mA as the 8.9 Electrical Characteristics, LDO section of the datasheet mentions.

2) DVDD is related to the serial data interface, I2C and SPI. So, you may check if these lines have an abnormal behavior.

Best regards,
Luis Fernando Rodríguez S.

0 Bill Finger over 9 years ago in reply to Luis Fernando Rodriguez S.

Genius 3735 points

> 2) DVDD is related to the serial data interface, I2C and SPI.

Aren't these lines driven by IOVdd?

0 Luis Fernando Rodriguez S. over 9 years ago in reply to Bill Finger

TI__Guru* 84915 points

Hi, Bill,

Actually, both power supplies are related to this. DVDD powers the digital core of the TLV320AIC3204. The clock generation and PLL is included too. Please take a look at 12 Power Supply Recommendations section for details.

Best regards,
Luis Fernando Rodríguez S.

0 Bill Finger over 9 years ago in reply to Luis Fernando Rodriguez S.

Genius 3735 points

I have another question. What prevents the over current condition from happening, just from charging the bypass caps?

0 Luis Fernando Rodriguez S. over 9 years ago in reply to Bill Finger

TI__Guru* 84915 points

Hi, Bill,

Yes, the bypass caps help to prevent the over current condition. Also, it could be related with the power supply sequencing (www.ti.com/.../slaa492a.pdf).

Have you tested different processing blocks to see if the over current flag is still enabled?

Best regards,
Luis Fernando Rodríguez S.

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AIC3204 DVdd Over Current