NXP Semiconductors MPC5775B Bedienungsanleitung

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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