Getting Started with the RD33774CNC3EVB Reference Design

2.1 Board Features

The main features of RD33774CNC3EVB are:

• CAN or CAN FD communication up to 5 Mbit/s to MC33665A
• Onboard CAN transceiver TJA1443
• Configurable CAN communication and CAN FD arbitration speeds on CFG0 and CFG1 pins using SW1 dual inline package (DIP) switch
• Configurable CAN ID (ID0_STB_OD, ID1, ID2, and ID3) for MC33665A using SW1 DIP switch
• Three MC33774 battery cell controllers
• Voltage monitoring and passive cell balancing functionality for up to 54 cells
• Capacitive isolation for daisy chain communication of onboard MC33774 devices and for offboard daisy chain communication
• Transformer isolation from TPL port 0 of MC33665A to MC33774
• Flexible configuration: single chain with loopback or two independent daisy chains without loopback

2.2 Board Description

The RD33774CNC3EVB is a CCMU reference design, which can communicate directly with CAN or CAN FD.

The MC33665ATF4AE populated on the RD33774CNC3EVB is a gateway router that can route transport protocol link (TPL) messages with CAN or CAN FD communication protocol. The MC33774 is a battery cell controller from NXP to monitor the cell voltages, temperatures, and passive balance. The RD33774CNC3EVB can monitor up to 54 cells onboard, and can be daisy-chained using an external TPL port for a higher number of cells.

Note: MC33665ATF4AE is used in RD33774CNC3EVB. Read any reference in this documentation to MC33665A as MC33665ATF4AE.

2.3 Board Components

Overview of the RD33774CNC3EVB board

Overview of the RD33774CNC3EVB board

Overview of the RD33774CNC3EVB board

3.1 Standalone Test Setup

RD33774CNC3EVB can be used in different setup configurations to check the performance of the MC33665A and the MC33774. Figure 1 is a minimal hardware setup to check most of the functions and features built in RD33774CNC3EVB. The BATT-18EMULATOR board can emulate a multicell (18 cells) battery pack that can be easily connected to up to three BCC evaluation boards from NXP. Cell terminal and temperature (J1_1, J1_2 and J1_3) interface cable from RD33774CNC3EVB are compatible to the BATT-18EMULATOR.

RD33774CNC3EVB test setup

RD33774CNC3EVB test setup

Figure 1. RD33774CNC3EVB test setup

The J25 connector can be used to power the MC33665A and communicate with CAN or CAN FD to the RD33774CNC3EVB. CAN tools can be interfaced to J25 for establishing CAN or CAN FD communication with RD33774CNC3EVB.

• Set up the communication to RD33774CNC3EVB using the data sheets of the MC33665A  and the MC33774
• Refer to Section 2.2 to set the CFG0, CFG1, ID0_STB_OD, ID1, ID2, and ID3 based on external CAN (FD) communication
• Based on test requirements, extra external MC33774 BCC boards can be connected to RD33774CNC3EVB
  • Connect to J2_1 as extension to daisy chain port 0 from third MC33774
  • Connect to J2 as second daisy chain of BCC devices connected to port 1 of MC33665A
• Connect 5 V to BATT-18EMULATOR and 12 V to RD33774CNC3EVB after crosschecking the interface connections and boards based on test plan

3.2 RD33774CNC3EVB as Part of the HWRD-HVBMSCC

RD33774CNC3EVB is part of a hardware reference design for high voltages: HWRDHVBMSCC. To use the RD33774CNC3EVB in this environment, refer to the HWRDHVBMSCC user manual and website.