4 Circuit Design
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46
Figure 14. Reference circuit 1 for serial port level conversion
Figure 15. Reference circuit 2 for serial port level conversion
4.4.3
I
2
C
The module provides a set of I
2
C interfaces that support communication rates of 100
Kbps in standard mode, 400 Kbps in fast mode, and 3.4 Mbps in high-speed mode. The
I
2
C bus is a simple, bidirectional two-wire synchronous serial bus. It only requires a data
line and a clock line to transfer information between devices connected to the bus. It is
mainly used in the communication between multiple integrated circuits in the system.
The I
2
C interfaces are all open-drain outputs. When using these interfaces, please pull up
to 1.8 V power domain through external pull-up resistors. When I
2
C has more than one
peripheral, please ensure the uniqueness of every peripheral address. When mounting
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