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I2C Bus Length and No of Slave connection

Question asked by Krunal Shah on Jun 21, 2017
Latest reply on Jun 28, 2017 by Krunal Shah

Dear Sir/Madam

 

We have designed one system where we are using 7bit I2C address and connecting 30 slave boards to the Master board(Using imx6ul or imx6ull) on same I2C Bus. My master and Slave boards are connected with PCB or Rigid+Flex PCB.

Attached is the I2C waveform which we captured after we connect 10, 20 & 30 Slave to the BRAIN/Master. Brain/master and each slave using 4.7k pull up resistor with 3.3V & each slave is generating its own 3.3V and GND is common in the whole system.

 

If we connect more slave to the same I2C bus, will it be allow me to connect on the same bus without any problem, based on the attached waveform? Can you please guide how we can check and verify the same? The newer slave will be same as earlier 10/20/30 slaves and will have the pull up of 4.7k

 

In nut shell if we use 7bit/10bit I2C address and BRAIN is connected with 125/1020slaves(BRAIN and Slaves connected with PCB and connector, no cables used to connect them) what parameter we need to check and how so can be sure that i can physically do the same. Please help/guide so we can expand the system.

 

Thanks

Krunal Shah

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