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OPT3101EVM: Connecting I2C lines of EVM to external MCU i2c lines

Part Number: OPT3101EVM

Hi everyone

There are two i2c master on I2C bus which are MSP430 and EFM32(my mcu). 

I connect i2c of EFM32 to EVM.

If TI-Latte GUI tool is not started, both i2c lines(SCL_S, SDA_S on EVM) state are high. 

And then I start i2c of EFM32 with EVM, there is a BUS ABORT. 

My question is when I start i2c between EFM32(my mcu) and EVM, MSP430 i2c lines on OPT3101EVM are disconnect??