RC22312A/RC32312A Evaluation Board Manual
R31UH0022EU0100 Rev.1.00
Mar 28, 2023
1.2.7. Serial Connection
The EVB can be connected to a computer via a USB3.0 to USB-C connector. The on-board USB-to-MPSSE
Bridge (FTDI FT232HQ) can handle the data communication. The +5V from the USB-C powers the on-board
regulators (see section 1.2.1.1).
The Bus Source connector J119 is used to select the source of the communication bus. The bus will be I
2
C for
most communication but can also be SPI for specific tests. Pins 1 and 2 in J119 are SDA and SCL from the FTDI
chip. Pins 3 and 4 pass the SDA and SCL to the I
2
C level shifter. To use the on-board FTDI chip, install jumpers
on pins 1–3 and 2–4. The board will be shipped with these jumpers installed. Theoretically, any I
2
C adapter can
be connected to pins 3 and 4 for SDA and SCL. Pin 6 can be used as the ground connection for the I
2
C
connection. Pins 3, 4, 5 and 6 are arranged such that a Total Phase I
2
C Host Adapter (part number: TP240141)
can be plugged onto pins 3, 4, 5 and 6 only (see Figure 19).
For default I
2
C operation, jumpers are installed on pins 1–3 and 2–4 (see jumper J119 in Table 2).
Figure 19. Communication Setup for I
2
C Mode
Note: For SPI operation instructions, contact Renesas support.
1.2.8. On-board EEPROM
The EVB also supports an external EEPROM IC for loading of an RC22312A/RC32312A configuration
programmed into the EEPROM as an option. To load the configurations from EEPROM, the EEPROM load
enable bit must be set in device OTP. If the enable bit is not set, the EEPROM load will be skipped.
The EVB provides a socket of 8-lead DIP8 SOIC-8 socket (Figure 20) so other EEPROM devices of different
memory size can be tested.
Figure 20. EEPROM in Socket
Figure 21. EEPROM Pin Description
RC22312A/
RC32312A
I2C
Level
Shifter
1 2
1 2
2 64
1 53
= Jumper
J62
SDA
3.3V / 1.8V
3.3V / 1.8V
SCL
GND
SCL_3.3V
SDA_3.3V
J119
SDA
SCL
FTDI
Chip
USB
Type-C
Port
J61
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