Figure 9 display the highlighted 9 pin connector J303 on bottom side of SoM_IoT_1V2 2V0 printed circuit board. This connector allocate the large-scale integrated circuit R-IN32M3-EC with external SPI I2C and two additional SYNC UART signals. Furthermore the power supply pins VCC33 and GROUND are connected on J202.
Pin 28 (VCC33) and pin 2 (GND) should be connect with external DC voltage source. The SoM_iRJ45 is specified for an input voltage range of 3,0V DC to 3,6V DC.
Pin 29 has chip select (CS) function for R-IN32M3-EC Clocked Serial Interface H (CSIH) which works in Slave Mode at CSIH channel 0. The used chip select sink for this R-IN32M3-EC based module is Port P70, Port P71 drives permanently to GND level.
Pin 30 connect the RESETZ ball I2C_SDA1) This pin is used for serial data input and output. This pin is an N-ch open-drain output for both master and slave devices on real time port RP01 of R-IN32M3-EC realized. For Functional Overviewsee also User’s Manual R18UZ0007EJ1100 chapter 18 I2C BUS (IICB)
Note: Because the outputs of the serial clock line and serial data bus line are N-ch open-drain outputs, an external pull-up resistor must be connected to these lines
Pin 29 (I2C_SCL1) This pin is used for serial clock input and output. This pin is an N-ch open-drain output for both master and slave devices on real time port RP00 of R-IN32M3-EC realized.
Pin 30 (UART_RXD0) Receive data input on port P20 of R-IN32M3-EC . So an external reset signal can initialize the CPU core and the internal peripheral modules.Pin 31 complies the MISO function for SPI connection. This pin connect the (URTJ0TRXD). For Interrupts and peripheral modulessee also User’s Manual R18UZ0007EJ1100 chapter 16 Asynchronous Serial Interface J (UARTJ)
Pin 31 (UART_TXD0) Transmit data output on port P21 of R-IN32M3-EC CSIH serial data output signal at Port P47 (CSISO0(URTJ0TTXD).
Pin 32 complies the MOSI function for SPI connection. This pin connect the (UART_RTS0) optional Ready To Send on port P43 of R-IN32M3-EC CSIH serial data input signal at Port P46 (CSISI0).
Pin 33 complies the SCK function for SPI connection. This channel 0 CSIH signal connect the serial clock of R-IN32M3-EC at Port P45. (GND) optional Ground
Pin 34 (CATSYNC0) connect Port P11 UART_RXD1) Receive data input on port P30 of R-IN32M3-EC and is able to use as GPIO or EtherCAT Sync0 signal connection(URTJ1TRXD).
Pin 35 (CATSYNC1) connect Port P10 UART_TXD1) Transmit data output on port P31 of R-IN32M3-EC and is able to use as GPIO or EtherCAT Sync1 signal connection(URTJ1TTXD).
Pin 36 (CATSYNC1) connect Port P10 UART_RTS1) optional Ready To Send on port P74 of R-IN32M3-EC and is able to use as GPIO or EtherCAT Sync1 signal connection.