STM32WL55JC datasheet(47/147 Pages) STMICROELECTRONICS

47 / 147 page

DS13293 Rev 2

47/147

STM32WL55/54xx

Functional overview

–

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

–

Fast-mode plus (Fm+), with a bitrate 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

–

clock stretching (optional)

•

SMBus (system management bus) specification rev 2.0 compatibility:

–

hardware PEC (packet error checking) generation and verification with ACK

control

–

address resolution protocol (ARP) support

–

SMBus alert

•

PMBus (power system management protocol) specification rev 1.1 compatibility

•

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

communication speed to be independent from the PCLK reprogramming (see Figure 8)

•

wakeup from Stop mode on address match

•

programmable analog and digital noise filters

•

1-byte buffer with DMA capability

3.30

Universal synchronous/asynchronous receiver transmitter

(USART/UART)

The devices embed two universal synchronous receiver transmitters, USART1 and

USART2 (see Table 16 for the implementation details).

Each USART provides asynchronous communication, IrDA SIR ENDEC support,

multiprocessor communication mode, single-wire half-duplex communication mode. Each

USART has LIN Master/Slave capability and provides hardware management of the CTS

and RTS signals, and RS485 driver enable.

Table 15. I2C implementation

I2C features(1)

1. X = supported.

I2C1(2)

2. The register content is lost in Stop 2 mode.

I2C2(2)

I2C3

7-bit addressing mode

10-bit addressing mode

Standard-mode (up to 100 Kbit/s)

Fast-mode (up to 400 Kbit/s)

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

Independent clock

Wakeup from Stop mode

X(3)

3. Wakeup supported from Stop 0 and Stop 1 modes.

X(3)

X(4)

4. Wakeup supported from Stop 0, Stop 1 and Stop 2 modes.

SMBus/PMBus

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