NXP Semiconductors MPC5775B User manual
MPC5775B BMS plus VCU Reference Design
User Guide
NXP Semiconductors Document identifier: MPC5775BDCRDUG
Rev. 0, February 2020
Contents
Chapter 1 Introduction........................................................................................... 3
Chapter 2 Hardware User Guide........................................................................... 4
Chapter 3 Software User Guide...........................................................................25
Chapter 4 GUI user guide.................................................................................... 39
Chapter 5 Bootloader User Guide........................................................................41
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Chapter 1
Introduction
This user guide gives an overview of hardware and software for the powertrain domain controller reference design based on
MPC5775B MCU integrated the BMS and VCU in one ECU. The reference design is intended to provide a mechanism for easy
customer evaluation of the Cobra55 family of microprocessors, and to facilitate hardware and software development.
1.1 List of acronyms
The following table provides a list and description of acronyms used throughout this document.
Table 1. Acronyms and abbreviations
Acronym Description
PDC Powertrain Domain Controller
EV Electric Vehicle
BMS Battery Management System
VCU Vehicle Control Unit
SBC System Basis Chip
TPL Transform Physical Layer
BCC Battery Cell Controller
RTC Real Time Clock
DNP Do Not Populate
CAN Controller Area Network
ECU Electronic Control Unit
MSDI Multiple Switch Detection Interface
PHY Physical
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Chapter 2
Hardware User Guide
2.1 Overview
Figure 1. Master board
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Figure 2. System block diagram
2.2 Board features
The system mainly consists of a master board and several slave boards connected in series with a daisy-chain with TPL.
The master board provides the following key features:
• NXP MPC5775B Microcontroller (416 MAPBGA soldered)
• Support Daisy chain of BCC device connection with Transformer isolation
• Integrate NXP Power SBC FS65xx with one CAN physical layer
• Master power regulator status LEDs
• One user reset switch with reset status LEDs
• Two user LEDs is connected to GPIO for test
• Standard 14-pin JTAG debug connector
• One Mbit Automotive external EEPROMs with SPI
• 1 Automotive tiny Real-Time Clock/calendar with alarm function and I²C-bus
• Integrate multiple communication interfaces:
• 1 x 100BASE-T1 Automotive Ethernet interface TJA1101
• 3 x CAN interfaces, two is supported via NXP CANFD transceiver TJA1052 and TJA1145, another is supported via
FS65xx.
• 1 x LIN interface MC33662BLEF
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• 1 x Mini USB / UART FDTI transceiver to interface with MCU
• Integrate input/output devices:
• 33 channel multiple switch detection interface devices(MC33CD1030)
• Quad high side with SPI Control(MC15XS3400)
• 16-output low side switch with SPI Control(MC33996)
• A 130-pin ECU connector, routing external I/O signals including:
• 10 x ADC input channels
• 16 x Switch input channels
• 2 x PWM input capture channels
• At least 2 x PWM output channels via HSD and LSD
• 5 x 5V + 1 x 12 V power supply for external sensor
• 4 x HSD output channels
• 11 x LSD output channels
14 channels of MC33CD1030 is routed to 130-pin connector and 11 channels of MC33996 is routed to 130-pin
connector.
NOTE
2.3 Module introduction
2.3.1 Power SBC
2.3.1.1 Board power
The MC33FS6523CAE provides a robust, scalable power management to the MPC5775B MCU with fail silent safety monitoring
measures making it fit for ASIL-D. It consists of multiple switching and linear voltage regulators.
When external power, typical 12 V automotive DC power supply with current limit > 600 mA, is applied to jumper J8 connector
of master board.
• VBAT pins connects to DC power supplier 12 V+.
• GND pins connects to DC power supplier GND,
• Keep Jumper J1 onboard.
Five green power LEDs show the presence of the supply voltages as follows:
• LED D55 - Indicates that the 12 V external power is enabled and working correctly.
• LED D56 - Indicates that the 3.3 V linear regulator is enabled and working correctly.
• LED D57 - Indicates that the 5.0 V linear regulator is enabled and working correctly.
• LED D58 - Indicates that the 5.0 V linear regulator dedicated to the internal CAN FD interface is enabled and working
correctly.
• LED D59 - Indicates that the 1.25 V switching regulator is enabled and working correctly.
The following figure shows the power LED's circuit in detail.
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Figure 3. Board power LEDs
2.3.1.2 VCCA, VAUX voltage configuration
The voltage of VCCA and VAUX is configurable through the external resistor(R8) connected to SELECT pin. The default value of
R8 on the board is 24K, it means VCCA=3.3 V, VAUX=5.0 V. The following table show the configuration of VCCA, VAUX voltage, if
the SELECT pin is detected open, the VCCA regulators start at their minimum output voltage 3.3 V.
VCCA/VAUX voltage selection
Table 2. VCCA and VAUX configuration
VCCA(V) VAUX(V) R select Recommended value
3.3 3.3 < 6.0 kΩ 5.1 kΩ ±5.0%
5.0 5.0 10.8 << 13.2 kΩ 12 kΩ ±5.0%
3.3 5.0 21.6 << 26.2 kΩ 24 kΩ ±5.0%
5.0 3.3 45.9 << 56.1 kΩ 51 kΩ ±5.0%
2.3.1.3 Debug mode
The jumper J1 is used to configure the DEBUG mode of SBC, keep it onboard as shown in the following figure to activates the
Debug mode. Once activated, there is no deep fail-safe state.
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Figure 4. SBC DEBUG Jumper
2.3.1.4 Reset circuit
When the specific condition is reached, the SBC will reset MCU via SBC_RSTB pin. The following figure shows the board supports
multiple MCU reset methods like SBC, JTAG and Switch Reset(SW1).
Figure 5. Board reset circuit
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2.3.1.5 Communication interface
FS6523(U1) has a high speed CAN transceiver. It is routed to the MCU FlexCAN_B port(AC19, AD19). The pin-out of the 130-
pin connector (J8) is C11, D11.
The SBC SPI signal is transferred to the MCU through DSPI2 with CS0. MCU uses the interface to control SBC watchdog and
so on.
Figure 6. FS6523 application circuit
2.3.2 MCU power and GND configuration
The VDDEH and VDDE is MCU I/O supply voltage connected to VCCA(3.3V) from SBC, and VDDA_EQ is eQADC supply voltage
connected to VAUX(5V).
2.3.3 MCU external clock circuit
In addition to the internal 16 MHz oscillator, the MCU can also be clocked by external oscillator (Y1). The clock circuitry for the
40 MHz crystal is shown in the following figure. The symbol named “DNP” indicates the device is not mounted to the PCB.
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Figure 7. 40 MHz crystal circuit
2.3.4 JTAG connector
The master board is fitted with 14-pin JTAG debug connector. The following figure shows the 14-pin JTAG connector pinout.
Figure 8. JTAG connector point
2.3.5 USB/UART transceiver
Mini USB connector interfaced with FT232RQ is connected to MCU eSCI_C port(AD22, AF23), USB to serial UART chip (U17).
The USB to serial UART connection is shown in the following figure. Can connect to PC via mini USB to put string on screen or
get string from screen by Serial Debug Assistant.
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