Why I2C lost its data after 3.2V above?

[sitizarina]

Hi all, I have face a problem during my lab experiment on I2C.

I'm using 1 master and 4 slaves. Each slaves is connected to 10 LEDs and I'm using switching method to ON all the LEDs.

The problem is after I give 3.2 volt power supply, the data that is produced from I2C can be seen but is not good enough and it also means all the LED can be ON. But after 3.2V and above, the data automatically lost and it means all the LEDs is Off. For 3.2 V I found out the current is 0.15A and after I increase the voltage above 3.2V, automatically the current is lower which is 0.02A.

Can someone help me on why this problem could happen.
Thank you.

 

[ckshivaram]

Please check Are you using pull up resistor and following the i2c hardware standards. some slave is overloading the circuit

 

[sitizarina]

Yes, I'm using a pull up resistor which is 4.7kOhm. What else should I consider? Should I add more pull up resistor? For yur information for 1 slave and 1 master it works fine with current in the power supply is 0.12A.

---------- Post added at 08:45 ---------- Previous post was at 08:43 ----------

The problem occur when I increase the Voltage to 3.2 V and above. The current is not affect the circuit because I have set the current high at the power supply

 

[Embedded Partner]

send me the schematic of that circuitry

so i can check it and help u

 

[ckshivaram]

check all the slaves individually, then integrate one by one checking the functionality. some slave is overloading the circuit.