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2
16 I
C (I2C)
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
The serial 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
2
C bus. When the I2C is set into slave mode, one or more master and slave devices that have a unique address may be
connected to the I
2
C bus.
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
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
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
S1C31
V
DD
SDAn
SCLn
Seiko Epson Corporation
I
C bus serial data input/output pin
2
I
C bus clock input/output pin
2
* Indicates the status when the pin is configured for the I2C.
I
2
C bus
External
I
2
C device
2
C Devices
of this IC or lower voltage. However, if the
DD
of this IC but within the recommended
DD
S1C31D50/D51 TECHNICAL MANUAL
Function
2
C devices.
External
I
2
C device
(Rev. 2.00)
C
2
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