STM32U545NET6QTR datasheet(79/283 Pages) STMICROELECTRONICS

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DS14216 Rev 1

79/283

STM32U545xx

Functional overview

3.41

Inter-integrated circuit interface (I2C)

The device embeds four I2C. Refer to Table 21 for the features implementation.

The I2C bus interface handles communications between the microcontroller and the serial

I2C bus. It controls all I2C bus-specific sequencing, protocol, arbitration and timing.

The I2C peripheral supports:

•

I2C-bus specification and user manual rev. 5 compatibility:

–

Slave and Master modes, multimaster capability

–

Standard-mode (Sm), with a bit rate up to 100 Kbit/s

–

Fast-mode (Fm), with a bit rate up to 400 Kbit/s

–

Fast-mode Plus (Fm+), with a bit rate up to 1 Mbit/s and 20 mA output drive I/Os

–

7-bit and 10-bit addressing mode, multiple 7-bit slave addresses

–

Programmable setup and hold times

–

Optional clock stretching

•

System management bus (SMBus) specification rev 3.0 compatibility:

–

Hardware PEC (packet error checking) generation and verification with

ACK control

–

Address resolution protocol (ARP) support

–

SMBus alert

•

Power system management protocol (PMBus) specification rev 1.3 compatibility

•

Independent clock: a choice of independent clock sources allowing the I2C

communication speed to be independent from the PCLK reprogramming

•

Autonomous functionality in Stop modes with wake-up from Stop capability

•

Programmable analog and digital noise filters

•

1-byte buffer with DMA capability

Table 21. I2C implementation

I2C features(1)

1. X: supported

I2C1

I2C2

I2C3

I2C4

Standard-mode (up to 100 Kbit/s)

Fast-mode (up to 400 Kbit/s)

Fast-mode Plus with 20 mA output drive I/Os (up to 1 Mbit/s)

Programmable analog and digital noise filters

SMBus/PMBus hardware support

Independent clock

Autonomous in Stop 0, Stop 1 mode with wake-up capability

Autonomous in Stop 2 mode with wake-up capability

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