About the pattern layout of ISO7240C.

Satoshi

Guru 19645 points

Other Parts Discussed in Thread: ISO7240C

The following patterns are examining the client.

The 4.7kΩ pull-up is connected between ISO7240C_Out and AM26LV31C_In.

Is the above-mentioned pattern right?

When it affect operation of ISO7240C by 4.7k pull-up, please let me know.

Best regards,

Satoshi

over 11 years ago

0 SaranganValavan over 11 years ago

TI__Intellectual 1815 points

Satoshi,

The ISO7420C's performance should not be affected by the 4.7kohm pull up resistor. But there will be additional power consumption across the resistor when the data lines are low. ISO7420C has CMOS output stages and so does not require the pull up resistor for normal operation . So my suggestion is to remove the resistors.

Regards,

Sarangan Valavan

0 Thomas Kugelstadt over 11 years ago in reply to SaranganValavan

TI__Mastermind 28265 points

hold on, before removing the 4.7k resistor. does the customer use the enable pin of the isolator to disable the outputs?

If yes, then the pull-up resistors provide a defined high-potential to the receiver input. / Thomas

0 SaranganValavan over 11 years ago in reply to Thomas Kugelstadt

TI__Intellectual 1815 points

Thomas ,

In this case , the EN pin is directly shorted to the same supply as the 4.7kohm pull ups and not controlled separately to disable the isolator. So it might be ok to remove the resistors.

Regards,

Sarangan

0 Thomas Kugelstadt over 11 years ago in reply to SaranganValavan

TI__Mastermind 28265 points

Thank you, I could not see this clearly on my screen. In this case you are right, he can remove the pull-up resistors.

best regards, Thomas

0 Satoshi over 11 years ago in reply to Thomas Kugelstadt

Guru 19645 points

Thank you very much for your quick response.

Best regards,

Satoshi

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About the pattern layout of ISO7240C.