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STM32L151 I2C in low power run mode

Question asked by Chris152 on Jun 21, 2017

I'm looking to use the STM32L151 in low-power run mode with I2C. The datasheet says I2C can be used in this mode (DocID022799 pg.17) but to operate in low-power run mode, the system clock needs to be the MSI set to 131kHz (DocID022799 pg.14). The problem is that the reference manual says the peripheral input clock for the I2C needs to be at least 2MHz (RM0038 pg. 668) and the HAL checks for this. What am I missing here?