2.7 I²C Interface Description

The MCP16503 is a fast-plus mode device, supporting data transfers at up to 1 Mbit/s as described in the I²C Bus specification.

The MCP16503 is a target-only device without clock-stretching capability.

The MCP16503 assumes that the I²C logic levels on the bus are generated by a device operating from a nominal supply voltage of 3.3V (with ±10% tolerance). This is typically the I/O voltage generated by Buck1 (VDDIO). Therefore, V_IH and V_IL levels are not related to the SVIN voltage value. The SDA and SCL lines should not be pulled up to the MCP16503 SVIN voltage, but to the VDDIO voltage I²C host interface supply voltage (3.3V nominal).

The MCP16503 I²C interface is always accessible, even in the OFF state, as long as the SVIN pin is powered and above the UVLO threshold. Note that in the OFF state, the VDDIO voltage from Buck1 is turned off and therefore the I²C pull-up voltage rail must be provided externally.