Embedded Planet, Inc.
epConnected Vehicle | Product User Manual
Version: 1.0.0 | 25 Feb 22
Embedded Planet, Inc. | 31225 Bainbridge Rd Suite N, Solon, OH 44139 | 216-245-4180 | www.embeddedplanet.com |
Page 18 of 39
11.3.
Component Interfaces | UART Managers
The RS-232 transceiver IC is an ST3232BTR (U4). This component drives both of the two RS-232
interfaces hosted on the epConnected Vehicle device. The first UART interface communicates with the
Agora MCU through UART signals, while the second UART interface is converted to the I
2
C bus using a
SC16IS750IBS (U3). The I
2
C address for this component is 0x9A. The interrupt signal IO_INT# is shared
between U3 and U8 (U6 optional; not connected by default).
For more detail on the ST3232BTR please refer to
https://www.st.com/en/interfaces-and-
transceivers/st3232b.html
For more detail on the C16IS750IBS please refer to
https://www.nxp.com/part/SC16IS750IBS#/
TABLE 9 – U4 PIN ASSIGNMENTS
Signal
U4 pin
RS232_TX_OUT_CON_2 T2OUT (pin 7)
RS232_RX_IN_CON_2
R2IN (pin 8)
RS232_TX_IN_CON
R1IN (pin 13)
RS232_RX_OUT_CON
T1OUT (pin 14)
TX_OUT (to MCU)
T1IN (pin 11)
RX_IN (to MCU)
R1OUT (pin 12)
RX (U3 pin 24)
R2OUT (pin 9)
TX (U3 pin 23)
T2IN (pin 10)
11.4.
Component Interfaces | CAN Managers
The CAN interface for the epConnected Vehicle consists of a TI SN65HVD231 CAN transceiver (U9) paired with
an MCP2515 CAN controller (U8). The MCP2515 communicates with the MCU over a SPI interface. The chip
select line for this component (CAN_CS#) is controlled by pin P1.09 on the nRF52840 MCU.
For more on the SN65HVD231, please refer to
https://www.ti.com/product/SN65HVD231/
.
Power to the CAN components can be discretely managed by the MCU. For more detail on this, please
refer to the power section of this manual.