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16.2. Input/Output Pins and External Connections
16.2.1. List of Input/Output Pins
Table 16.2.1.1 lists the I2C pins.
Pin name
SDAn
SCLn
If the port is shared with the I2C pin and other functions, the I2C input/output function must be assigned
to the port before activating the I2C. For more information, refer to the "I/O Ports" chapter.
16.2.2. External Connections
Figure 16.2.2.1 shows a connection diagram between the I2C in this IC and external I
data (SDA) and serial clock (SCL) lines must be pulled up with an external resistor.
When the I2C is set into master mode, one or more slave devices that have a unique address may be
connected to the I
C bus. When the I2C is set into slave mode, one or more master and slave devices that
2
have a unique address may be connected to the I
Serial data (SDA)
Serial clock (SCL)
Figure 16.2.2.1 Connections between I2C and External I
Notes:
The SDA and SCL lines must be pulled up to a V
•
the I2C input/output ports are configured with the over voltage tolerant fail-safe type I/O,
these lines can be pulled up to a voltage exceeding the V
recommended operating voltage range of this IC.
The internal pull-up resistors for the I/O ports cannot be used for pulling up SDA and SCL.
•
When the I2C is set into master mode, no other master device can be connected to the I
•
bus.
•
16-2
Table 16.2.1.1 List of I2C Pins
I/O*
Initial status*
I/O
I
I/O
I
C bus.
2
V
DD
SDAn SCLn
Seiko Epson Corporation
I 2 C bus serial data input/output pin
I 2 C bus clock input/output pin
* Indicates the status when the pin is configured for the I2C.
S1C31
2
I
C bus
External
I
2
C device
of this IC or lower voltage. However, if
DD
of this IC but within the
DD
Function
C devices. The serial
2
External
I
2
C device
C Devices
2
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
C
2
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