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http://www.ti.com/lit/ds/symlink/tms320f28027.pdf
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Table 6-40. I2C Switching Characteristics Vol Low level output voltage 3-mA sink current
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5.4 Recommended Operating Conditions
Low-level output sink current, VOL = VOL(MAX), IOL Group 2 (2) : 8mA
(2) Group 2 pins are as follows: GPIO16, GPIO17, GPIO18, GPIO19, GPIO28(SDAA), GPIO29(SCLA), GPIO36, GPIO37
what is the I2C SDA&SCL sink current capability