Datasheet

Functional overview STM32L476xx
52/270 DS10198 Rev 8
3.26 Inter-integrated circuit interface (I
2
C)
The device embeds three I2C. Refer to Table 12: I2C implementation for the features
implementation.
The I
2
C bus interface handles communications between the microcontroller and the serial
I
2
C bus. It controls all I
2
C bus-specific sequencing, protocol, arbitration and timing.
The I2C peripheral supports:
• I
2
C-bus specification and user manual rev. 5 compatibility:
– Slave and master modes, multimaster capability
– Standard-mode (Sm), with a bitrate up to 100 kbit/s
– 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
– Optional clock stretching
• System Management Bus (SMBus) specification rev 2.0 compatibility:
– Hardware PEC (Packet Error Checking) generation and verification with ACK
control
– Address resolution protocol (ARP) support
– SMBus alert
• Power System Management Protocol (PMBus
TM
) 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. Refer to
Figure 4: Clock tree.
• Wakeup from Stop mode on address match
• Programmable analog and digital noise filters
• 1-byte buffer with DMA capability
Table 12. I2C implementation
I2C features
(1)
1. X: supported
I2C1 I2C2 I2C3
Standard-mode (up to 100 kbit/s) X X X
Fast-mode (up to 400 kbit/s) X X X
Fast-mode Plus with 20mA output drive I/Os (up to 1 Mbit/s) X X X
Programmable analog and digital noise filters X X X
SMBus/PMBus hardware support X X X
Independent clock X X X
Wakeup from Stop 0 / Stop 1 mode on address match X X X
Wakeup from Stop 2 mode on address match - - X
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.