TCA9803: i2c BUFFER Query

xujunfeng

Part Number: TCA9803
Other Parts Discussed in Thread: PCA9306, LSF0102

Hello, in the figure, the 3.3V/1.8V master requires communication with four 1.2V slaves through I2C buffer. Is there any suitable scheme to recommend

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 319670 points

The TCA9803 will work in this application (if the A sides are connected to the master).

0 xujunfeng over 1 year ago in reply to Clemens Ladisch

Intellectual 260 points

the a sides can not connected to master,because the master is 3.3V /1.8V,the slave is 1.2V, is there any other recommendation

0 Clemens Ladisch over 1 year ago in reply to xujunfeng

Guru 319670 points

The TCA9803 does allow these voltages.

0 xujunfeng over 1 year ago in reply to Clemens Ladisch

Intellectual 260 points

There is an important point here, that is, the B end is the current source, not allowed to pull up, but the B end is to pick up the customer has designed the board, this I can not change

0 Clemens Ladisch over 1 year ago in reply to xujunfeng

Guru 319670 points

Can't you use a single buffer?

0 xujunfeng over 1 year ago in reply to Clemens Ladisch

Intellectual 260 points

The customer requires that no more than three devices be mounted

0 Clemens Ladisch over 1 year ago in reply to xujunfeng

Guru 319670 points

For level shifting, you could use the PCA9306/LSF0102 (it is not a buffer but a passive switch; it has the restriction that Vref_B must be larger than Vref_A, but the I/O voltages can be any voltage not below Vref_A).

0 xujunfeng over 1 year ago in reply to Clemens Ladisch

Intellectual 260 points

For our application here,What are the advantages and disadvantages of PCA9306 compared with TCA8306?

0 Clemens Ladisch over 1 year ago in reply to xujunfeng

Guru 319670 points

You have said that it is not possible to use the TCA9803 in your application. The PCA9306 would be possible to use.

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TCA9803: i2c BUFFER Query