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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Figure 9. USB/UART transceiver circuit
2.3.6 CAN transceiver
The master board has two high speed CAN transceivers.
• TJA1052i(U5) is a galvanically isolated interface between CAN controller and the physical two-wire CAN bus, and
connected to MCU MCAN0/FlexCAN_A port (AE19, AF19).
• TJA1045T/FD(U6) is a High-speed CAN transceiver for partial networking, and connected to MCU MCAN1/FlexCAN_D
port (AC20, AD20). TJA1045T/FD must be drove through DSPI. The SPI signal is transferred to the MCU through DSPI0
with CS2, MCU use the interface to configure the PHY.
Figure 10. TJA1052i transceiver circuit
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Figure 11. TJA1145 transceiver circuit
2.3.7 LIN transceiver
The master board is fitted with a NXP MC33662LEF LIN transceiver (U7) connected to MCU eSCI_A port(M2, M3). Configure
MCU eSCI_A module and assert LIN1_EN pin to enable the LIN communication.
Figure 12. LIN transceiver circuit
2.3.8 Ethernet PHY
The master board includes support for 100M-base T1 Automotive Ethernet PHY TJA1101(U9), utilizing the normal MII lite. It is
clocked by 25 MHz external oscillator (Y2). The default physical address is configured as 0b00xx0 by the pull-down or pull-up
resistor on the pin.
A pair of differential signal(EPHY_TRX_P, EPHY_TRX_M) is routed to 130-pin ECU connector.
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Figure 13. TJA1101 ETH PHY circuit
2.3.9 eQADC interface
The master board enables nine eQADC channels from ANA0 to ANA8. The first three channels are routed to MSDI_AMUX,
HSD_CSNS and SBC_MUXOUT port respectively. The others channels are routed to J8 to measure external analog signal, such
as pedal, sensor signal, through ADC input signal process circuit (as shown in the following figure).
In addition to MCU_AIN4 channel supports external 0-12 V analog signal input from J8, other channels only support 0-5 V.
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Figure 14. ADC input circuit
2.3.10 Digital signal interface
The master board supports to detect external switching signal, such as gear signal, through clamp circuit to MCU port (MCU_DIN0-
MCU_DIN5) .
In addition to MCU_DIN4 and MCU_DIN5 channels support 0/12V digital signal input from J8, other channels only support 0/5V
(as shown in the following figure).
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Figure 15. Digital input circuit
2.3.11 MSDI
The master board has a CD1030 to detect the closing and opening of multiple switch contacts and analog input signal. The input
signal is transferred to the MCU through DSPI2 with CS1.
As shown in the following figure, the master board enables SG0-SG9 as digital input, SP0-SP4 as analog input, these port is
connect to J8, and MCU read switch status via DPSI2, analog signal via MSDI_AMUX through eQADC channel 0 (ANA0).
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Figure 16. MSDI circuit
2.3.12 PWM input
The master board has two PWM input circuit to detect external PWM signal, the MCU_PWM_IN0/1 is routed to MCU eMIOS
channels 1/2. The user can use eMIOS mode Pulse width measurement mode to measure PWM signal, its amplitudes range
from 3.3 V to 12 V.
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Figure 17. PWM circuit
2.3.13 HSD (extreme switch)
The system requires several channels to drive external load. Provide high current driving capability that could control these
devices directly.
Generally load as:
• Main Contactor - 12 V dc coil voltage rating, 1~2A coil current at ON.
• Pre-Charge Contactor - 12 V dc coil voltage rating, 0.5 A coil current at ON.
• Cooling Fans - 1 2 V dc, 4.8 A
• Heater - 12 V dc 40 W
The master board use an extreme switch devices, NXP Quad high-side switch MC15XS3400(U15), to drive these loads, it is
supplied by 12 V dc power. It can provide four channel high side outputs, each channel up to 6 A current.
MCU can configure DSPI2 with CS2 to control it, and also supports the direct control to the output pins (HS0-HS3) via the
HSD_IN0-HSD_IN3 with GPIO.
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Figure 18. HSD circuit
2.3.14 LSD
The system requires several channels to control external contactor or relays, such as AC power switch, DCDC relay, etc. So the
master board is fitted with a NXP 16-output low side switch with a 24-bit serial input control MC33996 (U16), MCU can configure
DSPI2 with CS3 to control it. The PWM pin – LSD_PWM is routed MCU eMIOS channel three and the output of the output PWM
frequency is up to 2.0 KHz.
Figure 19. LSD circuit
2.3.15 TPL
Due to high voltage of battery packs, isolation is very important. This reference design isolate power supply and communications.
TPL communication daisy chain between slave boards is above 3750 V dc by device.
The MC33664 is a transceiver physical layer transformer driver designed to interface a MCU conveniently to a high speed isolated
communication network. It is needed for dual SPI for communication with MCU by half-duplex.
TPL communication port between master board and slave boards, the baud rate is 2 Mbps. It is linked as daisy chain with one
or more slave board. The board has two TPL(U10, U11) routed three MCU DSPI, includes DSPI0 with CS0 for master, DSPI1
with CS0 for TPL1 slave, DSPI3 with CS0 for TPL2 slave.
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Figure 20. TPL circuit
2.3.16 RTC
The master board is fitted with a NXP automotive RTC PCA85063(U3) with I2C communication, but the MPC5775B has no I2C
interface, so it can only be implemented by using the GPIO(V25, V26) to simulate I2C protocol. The default devices address is
0x51.
Figure 21. RTC circuit
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2.3.17 NVM
The master board has an external NVM – M95M01, an automotive 1024 Kbit SPI bus EEPROM with high speed clock. MCU can
read and write data through DSPI0 with CS1.
Figure 22. NVM circuit
2.4 130 pin ECU connector
There is a 130-pin ECU connector onboard, consisting of two parts of header M1 and M2.
Figure 23. 130-pin ECU connector
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