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CC1312R7: I2C logic levels and compatibility with i2c isolators

Andreas Urke
Expert 1480 points
Part Number: CC1312R7
Other Parts Discussed in Thread: ISO1640, CC1312R

Hi,

I was looking at the compatibility between cc13xx/cc26xx family and the TI ISO1640/1540 I2C isolators. The isolators has a output low voltage-level of 800 and 710 mV respectively. These levels are also "the common industry practice for bidirectional I2C isolators", as confirmed in my thread on the isolators forum: https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1209633/iso1640-compatibility-between-cc13xx-cc26xx-family-and-iso1640-iso1540 

Looking at the datasheets for the cc13xx/cc26xx family I see the GPIO voltage input threshold (V_IL) to be 0.2 * VDDS, which at the common voltage of 3.3 V is 0.66 V (see e.g. Section 8.21.6.1 in cc1312r datasheet). Is this the logic levels for the I2C as well? If no, what is the i2c logic-levels for the cc13xx/cc26xx family?

Regards