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BQ27510 Clock Stretching

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I have a BQ27510 connected to an ARM processor; the I2C baud is 375Kbits.  I notice significant clock stretching with the ninth bit (~120usec) for voltage reads.  The datasheet talks about clock stretching configuration control using the Operation Configuration Register.  However, I cannot find timing specifications that define the max/mins for the stretching.  Can you provide an explanation for the stretch, the cause of the stretch, and the time limits of the stretch?

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