Datasheet

Functional overview STM32F401xB STM32F401xC
28/139 DS9716 Rev 11
3.20 Inter-integrated circuit interface (I
2
C)
Up to three I
2
C bus interfaces can operate in multimaster and slave modes. They can
support the standard (up to 100 kHz) and fast (up to 400 kHz) modes. The I2C bus
frequency can be increased up to 1 MHz. For more details about the complete solution,
please contact your local ST sales representative.They also support the 7/10-bit addressing
mode and the 7-bit dual addressing mode (as slave). A hardware CRC
generation/verification is embedded.
They can be served by DMA and they support SMBus 2.0/PMBus.
The devices also include programmable analog and digital noise filters (see Table 5).
3.21 Universal synchronous/asynchronous receiver transmitters
(USART)
The devices embed three universal synchronous/asynchronous receiver transmitters
(USART1, USART2 and USART6).
These three interfaces provide asynchronous communication, IrDA SIR ENDEC support,
multiprocessor communication mode, single-wire half-duplex communication mode and
have LIN Master/Slave capability. The USART1 and USART6 interfaces are able to
communicate at speeds of up to 10.5 Mbit/s. The USART2 interface communicates at up to
5.25 bit/s.
USART1 and USART2 also provide hardware management of the CTS and RTS signals,
Smart Card mode (ISO 7816 compliant) and SPI-like communication capability. All
interfaces can be served by the DMA controller.
Table 5. Comparison of I2C analog and digital filters
- Analog filter Digital filter
Pulse width of
suppressed spikes
≥ 50 ns Programmable length from 1 to 15 I2C peripheral clocks
Table 6. USART feature comparison
USART
name
Standard
features
Modem
(RTS/CTS)
LIN
SPI
master
irDA
Smartcard
(ISO 7816)
Max. baud
rate in Mbit/s
(oversampling
by 16)
Max. baud
rate in Mbit/s
(oversampling
by 8)
APB
mapping
USART1 X X X X X X 5.25 10.5
APB2
(max.
84 MHz)
USART2 X X X X X X 2.62 5.25
APB1
(max.
42 MHz)
USART6 X N.A X X X X 5.25 10.5
APB2
(max.
84 MHz)
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