ISO1540, ISO1541

samuel Lin46897

1. VCC1 and VCC2>2.8V, THE OUTPUT SHOULD BE "H" FOLLOWING INPUT "H". THE TABLE SHOW "Z", IT SHOULD BE TYPO ? IT WOULD CONFUSE THE ENGINEERS MISSING "H" OUTPUT.

over 11 years ago

0 Adam Torma over 11 years ago

TI__Mastermind 45575 points

I am going to move this thread to the industrial interface forum for assistance with ISO154X

Adam

0 Thomas Kugelstadt over 11 years ago

TI__Mastermind 28265 points

It would confuse the engineers to see a "High" output because the outputs are open-drain, requiring external pull-up resistors to Vbus. So a high at the input causes the output to go high-impedance (Z), and only the pull-up resistor allows a high to appear at the output. Measured without pull-ups the output is Z.

All I2C devices are specified this way.

Regards, Thomas.

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ISO1540, ISO1541