P82B96:

Joh Fitchett

Part Number: P82B96

We intend to use the P82B96 to extend I2C interfaces. VCC will be 12V. The master interface is a TIVA processor with only 3.3V compatible I/O. Will the SY and SX interfaces be compatible with the TIVA? I don't see voltage levels for the RX and RY outputs described (when data is sent to the TIVA). However, I see that the master interface is compatible with 3.3V pullups. Thanks!

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 243820 points

Rx and Ry are inputs, not outputs.

The Sx/Sy pins are compatible with the TIVA I²C. The Tx/Ty/Rx/Ry pins are supposed to be connected to another P82B96 (see figure 9).

0 Joh Fitchett over 2 years ago in reply to Clemens Ladisch

Prodigy 10 points

Thanks... very fast response! Figure 9 is helpful. I was a little unclear with my question. The functional block diagram on page 13 shows the Output of the RX and RY receiver attached to the input of the SX and SY Receiver (inside the part) (pins 1 and 7). So whatever the internal drive/receive is on pins 1 and 7 it is determined to be safe for the TIVA regardless of P82B96 VCC (12V in my case), correct? ie. pins 1 and 7 are determined by the I2C pullup (3.3V in my case)... thanks very much!

0 Clemens Ladisch over 2 years ago in reply to Joh Fitchett

Guru 243820 points

Correct. All these pins are separated by level-shifting buffers; there is no direct connection.

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P82B96: