TAS5424C-Q1: How to disable the output from OSC_SYNC pin in master mode

Yoshikazu Kawasaki

Part Number: TAS5424C-Q1

Hello,

Would you please tell me how to disable the clock output from OSC_SYNC pin in master mode? It has output even when configuring 0x0A[6]=0 and 0x0B[7]=0, so it doesn't seem to work as shown in the datasheet.

Best Regards,

Kawasaki

over 5 years ago

0 Shawn Zheng over 5 years ago

TI__Mastermind 24835 points

Hi Kawasaki-san,
So want to disable the OSC clock output on the OSC_SYNC pin, right? We are replicating your issue and will get back to you later.
Best regards,
Shawn Zheng

0 Gregg Scott over 5 years ago

TI__Mastermind 34275 points

Kawasaki-san,

In Table 19, the default is that the clock is not present on the OSC_SYNC pin. It must be enabled by the software if you need a clock on this pin. You need to do nothing, if you do not need a clock.

0 Yoshikazu Kawasaki over 5 years ago in reply to Gregg Scott

TI__Expert 3510 points

Hello Gregg,

Thank you very much for your comments. Do you mean 0x0B[7]=1(default) is disabling the clock output(0x0B[7]=0 is enabling the clock output) even though the datasheet looks 0x0B[7]=1(default) is enabling the clock output? I'll ask my customer to confirm that.

Best Regards,

Kawasaki

0 Gregg Scott over 5 years ago in reply to Yoshikazu Kawasaki

TI__Mastermind 34275 points

Kawasaki,
The default value for bit 7 in register 0x0B is "0" for no clock on the OSC_SYNC pin. The software would need to set it to "1" if they want a clock on the OSC_SYNC pin.

0 Yoshikazu Kawasaki over 5 years ago in reply to Gregg Scott

TI__Expert 3510 points

Hello Gregg,

Thank you very much for your comments again. It seems the output from OSC_SYNC when 0x0A[6]=0x0B[7]=0 has around 40mVpp as shown below. Do you think it's normal by the register settings? My customer expected almost 0mVpp output. Note that their system configures Fs=417kHz.

Best Regards,

Kawasaki

0 Gregg Scott over 5 years ago in reply to Yoshikazu Kawasaki

TI__Mastermind 34275 points

Kawasaki,

The normal output signal when turned on is 3.3Vpp. If you are seeing this small voltage, it is probably leaking through and you are measuring it. It will not be an issue.

0 Toshiyuki Murakami over 5 years ago in reply to Gregg Scott

Prodigy 90 points

Hello,Gregg.

I ask you a question by addition for a question of Kawasaki.
A leak of the Clock waveform was observed by OSC_SYNC terminal.
It is the waveform of the internal clock which the waveform which Kawasaki attached leaks out to.
As for the frequency, 3.33MHz, voltage are 58mVpp.
fS sets it to 417kHz.
The Clock output becomes the halt setting.
Please tell me the manner to evade it because I influence EMI performance.

Best regards,

Murakami

0 Yoshikazu Kawasaki over 5 years ago in reply to Gregg Scott

TI__Expert 3510 points

Hello Gregg,

It seems my customer has EMI issue which would be caused by that. I'll ask you by email because you may need NDA information to fix this.

Best Regards,

Kawasaki

0 Gregg Scott over 5 years ago in reply to Yoshikazu Kawasaki

TI__Mastermind 34275 points

This is being taken offline due to NDA information

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TAS5424C-Q1: How to disable the output from OSC_SYNC pin in master mode