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How to change I2C frequency?

SMART
Intellectual 860 points

How to change I2C frequency from 400KHz to 100KHz?

Is the below right? Should I modify others?

Before:

#define PSP_I2C_MAX_BUS_FREQ            (400000u)    /* 400 KHz              */

Current:

#define PSP_I2C_MAX_BUS_FREQ            (100000u)    /* 100 KHz              */

Best Regards,

  • 0
    TI__Genius 12575 points

    Hi,

    Can you provide more information like which device you are refering to.

    Assuming that you are refering to C5515 device & to set I2C serial clock frequency to 100Khz  you need to do appropriate configuration using the below mentioned formula.

    SCL low period = (SYSCLK period) * (IPSC + 1) * (ICCL + d)

    SCL high period = (SYSCLK period) * (IPSC + 1) * (ICCH + d)

    Based on your system clock frequency you need to configure IPSC , ICCL, ICCH values appropriately to acheive 100KHz serial  frequency.This is also explained in respective I2C userguide.

    Hope the above information helps. 

    Regards

     Vasanth