User's Manual

EK-RA4W1 5. User Circuits
R20UT4683EJ0100 Rev.0.90 Page 18 of 30
Apr.28.20
5.10 Arduino UNO Headers
For the CN1, CN2, CN3, and CN4 headers, through holes are assigned with a pitch of 2.54 mm and these
headers are connected to the evaluation MCU according to the Arduino UNO R3 specification. Table 5-4,
Table 5-5, Table 5-6, and Table 5-7 show the signal specifications of the Arduino UNO connectors (the
actual connector components are not mounted on the board as shipped).
Table 5-4 Pin Assignments of CN1 (8-Pin Power Connector)
Pin No.
Signal Name
Specification
MCU
Signal Name
Pin No.
1
NC
Reserved


2
IOR
IOREF
VCC

3
RES
RESET
RES
10
4
3V3
Power supply
VCC

5
5V


6
GND
GND

7
GND
GND

8
VIN
VCC

Table 5-5 Pin Assignments of CN2 (6-Pin Analog Connector)
Pin No.
Signal Name
Specification
MCU
Signal Name
Pin No.
1
A0
AD input
AN004
40
2
A1
AN009
32
3
A2
AN010
31
4
A3
AN017
29
5
A4
AN021/SDA1
26
6
A5
AN022/SCL1
27