CHAPTER 16 I
2
C BUS
User’s Manual U16896EJ2V0UD
477
16.4 Functions
16.4.1 Pin configuration
The serial clock pin (SCL0) and serial data bus pin (SDA0) are configured as follows.
SCL0 .............. This pin is used for serial clock input and output.
This pin is an N-ch open-drain output for both master and slave devices. Input is Schmitt input.
SDA0 .............. This pin is used for serial data input and output.
This pin is an N-ch open-drain output for both master and slave devices. Input is Schmitt input.
Since outputs from the serial clock line and the serial data bus line are N-ch open-drain outputs, an external pull-up
resistor is required.
Figure 16-3. Pin Configuration Diagram
V
DD
SCL0
SDA0
SCL0
SDA0
V
DD
Clock output
Master device
(Clock input)
Data output
Data input
(Clock output)
Clock input
Data output
Data input
Slave device
