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CHAPTER 18 I
2
C BUS MODE (
µ
PD784225Y SUBSERIES ONLY)
User’s Manual U12697EJ3V0UM
18.4 I
2
C Bus Mode Function
18.4.1 Pin configuration
The serial clock pin (SCL0) and the serial data bus pin (SDA0) have the following configurations.
(1) SCL0
·········
I/O pin for the serial clock
The outputs to both the master and slave are N-ch open drains. The input is a Schmitt input.
(2) SDA0
·········
Shared I/O pin for serial data
The outputs to both the master and slave are N-ch open drains. The input is a Schmitt input.
Since the outputs of the serial clock line and serial data bus line are N-ch open drains, external pull-up resistor
are required.
Figure 18-6. Pin Configuration
Clock output
(Clock input)
Data output
Data input
(Clock output)
Clock input
Data output
Data input
SCL0
SDA0
SCL0
SDA0
Master device
Slave device
V
DD0
V
DD0
