AM261...ZCZQ1 datasheet(144/218 Pages) TI2

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6.11.5.8.1 I2C

The device contains three multicontroller Inter-Integrated Circuit (I2C) controllers. Each I2C controller was

designed to be compliant to the Philips I2C-bus™ specification version 2.1. However, the device IOs are not fully

compliant to the I2C electrical specification. The speeds supported and exceptions are described per port below:

• I2C1 and I2C2

– Speeds:

• Standard-mode (up to 100kbits/s)

– 3.3V

• Fast-mode (up to 400kbits/s)

– 3.3V

– Exceptions:

• The IOs associated with these ports are not compliant to the fall time requirements defined in the I2C

specification because they are implemented with higher performance LVCMOS push-pull IOs that were

designed to support other signal functions that could not be implemented with I2C compatible IOs. The

LVCMOS IOs being used on these ports are connected such they emulate open-drain outputs. This

emulation is achieved by forcing a constant low output and disabling the output buffer to enter the Hi-Z

state.

• The I2C specification defines a maximum input voltage VIH of (VDD

max + 0.5V), which exceeds the

absolute maximum ratings for the device IOs. The system must be designed to ensure the I2C signals

never exceed the limits defined in the Absolute Maximum Ratings section of this data sheet.

• I2C0

– Speeds:

• Standard-mode (up to 100kbits/s)

– 3.3V

• Fast-mode (up to 400kbits/s)

– 3.3V

– Exceptions:

• The IOs associated with this port were not design to support HS-mode.

• The rise and fall times of the I2C signals connected to these ports must not exceed a slew rate of

0.8V/ns (or 8E+7V/s). This limit is more restrictive than the minimum fall time limits defined in the I2C

specification. Therefore, it may be necessary to add additional capacitance to the I2C signals to slow

the rise and fall times such that they do not exceed a slew rate of 0.8V/ns.

• The I2C specification defines a maximum input voltage VIH of (VDD

max + 0.5V), which exceeds the

absolute maximum ratings for the device IOs. The system must be designed to ensure the I2C signals

never exceed the limits defined in the Absolute Maximum Ratings section of this data sheet.

Refer to the Philips I2C-bus specification version 2.1 for timing details.

AM2612, AM2611, AM2611-Q1, AM2612-Q1

SPRSPA7C – SEPTEMBER 2024 – REVISED JULY 2025

www.ti.com

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Product Folder Links: AM2612 AM2611 AM2611-Q1 AM2612-Q1

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