AN3147: MM908E624 Window Lift / Sun Roof LIN Slave

Freescale Semiconductor
Application Note
AN3147
Rev. 0.2, 11/2005
MM908E624 Window Lift / Sun
Roof LIN Slave
LIN Connectivity Based on the LIN 1.3 Communication
Protocol
by: Petr Cholasta
Roznov Czech System Center, Roznov p.R., Czech Republic
1
Introduction
Many automotive customers are looking to use LIN as
the new technology to bring enhancements and more
features to the automotive industry. LIN (Local
Interconnect Network) is a concept for low cost
automotive networks, which complements the existing
portfolio of automotive multiplex networks.
The main purpose of this application note is to describe
and demonstrate the usage of the MM908E624, which
has been developed as a highly integrated and
cost-effective solution for driving loads using relays
within a LIN architecture. It is especially suited for the
control of high-current motors using relays (e.g., window
lifts, fans, and sun roofs). The Window Lift application
was chosen as one of the typical device utilizations.
The other goal is to introduce Freescale LIN
development tools as the LIN based boards called
LINkits and also the FreeMASTER tool as an efficient
tool for an application control, evaluation, and
visualization.
The theme of this application note is mainly focused on
the demonstration of the capabilities and performance of
the MM908E624 in a LIN 1.3 enabled design. However,
it also introduces the 16-bit MCU MC9S12C32 as a LIN
1.3 Master.
Table of Contents
1
2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General Description . . . . . . . . . . . . . . . . . . . . . . . 2
2.1 System Outline . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 System Features . . . . . . . . . . . . . . . . . . . . . . 3
3 Freescale Tools Used . . . . . . . . . . . . . . . . . . . . . . 6
3.1 FreeMASTER Tool . . . . . . . . . . . . . . . . . . . . 6
4 Freescale Components Used . . . . . . . . . . . . . . . . 7
4.1 MM908E624 Integrated Triple High-Side
Switch with Embedded MCU and LIN
Serial Communication for Relay Drivers . . . . 7
4.2 MC9S12C32 16-Bit Microcontroller Unit . . . 10
4.3 LIN Physical Interface MC33399 . . . . . . . . . 12
5 Hardware Description . . . . . . . . . . . . . . . . . . . . . 13
5.1 MM908E624 Board . . . . . . . . . . . . . . . . . . . 13
5.2 MC9S12C32 LINkit Board . . . . . . . . . . . . . . 17
5.3 Car Door Window Lift Platform . . . . . . . . . . 18
6 Software Description. . . . . . . . . . . . . . . . . . . . . . 20
6.1 LIN Slave Software Arrangement . . . . . . . . 20
6.2 LIN Slave Software Description . . . . . . . . . . 24
6.3 LIN Master Software Arrangement . . . . . . . 34
6.4 LIN Master Software Description . . . . . . . . . 36
7 User Interface Description . . . . . . . . . . . . . . . . . 38
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.2 GUIs General Description . . . . . . . . . . . . . . 38
8 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
This product incorporates SuperFlash® technology licensed from SST.
© Freescale Semiconductor, Inc., 2005. All rights reserved.
Appendix A
Messaging Strategy
Appendix B
System Setup
General Description
2
General Description
The Window Lift application outline is based on one of several possible Window Lift / Sun Roof LIN
solutions, which Figure 1 displays. The Window Lift / Sun Roof LIN Master controls according to the
keyboard Right / Left Window Lift and Sun Roof LIN Slaves. Each Slave can be also controlled by a
dedicated LIN Slave keyboard, which can be realized as a standalone LIN Slave or could be part of the
Window Lift / Sun Roof LIN Slave node. To support system diagnostics, e.g., the possibility to control and
update the whole Window Lift / Sun Roof system, the LIN Master also acts as a gateway to a superior bus,
e.g., CAN.
Node in green — covered by the MM908E624 Window Lift application
Node in blue — functionality similar to the MM908E624 Window Lift application (not developed)
Node in gray — other possible Window Lift / Sun Roof Lin nodes and nodes stuff (not developed)
Figure 1. Window Lift / Sun Roof LIN Concept
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
General Description
2.1
System Outline
The Window Lift system concept is displayed in Figure 2. The Window Lift LIN Slave is realized by the
MM908E624 single package solution. This device controls the Car Door Window Lift platform by reading
the LIN bus data and Hall sensors signal. This enables controlling the window glass position and detecting
the window glass antipinch or stall occurrence. The LIN bus data stream is controlled by the LIN Master,
realized by the 16-bit MCU (MC9S12C32). This microcontroller was chosen from among the others
because of its LIN / CAN gateway capability.
The Window Lift application behavior is controlled by the FreeMASTER tool, which is used for
application evaluation also. To allow the user easy application control, GUIs (Graphical User Interface)
run in the FreeMASTER tool (see Section 3.1, “FreeMASTER Tool”).
FreeMASTER Tool
PC Parallel Port Cable
BDM Multilink
Window Lift Connection
MM908E624
Board Hall
Sensor Input
MM908E624
Board OUTs
Control GUI
Power Supply
Personal
Computer
(PC)
LIN Bus
MC9S12C32 LINkit Board (LIN Master)
MM908E624 Board (LIN Slave)
Figure 2. Window Lift System Concept
2.2
System Features
The FreeMASTER tool offers the user application control via three GUIs described in the following
sections:
• Section 2.2.1, “GUI “Window Lift Application Controlled by the LIN Bus” Introduction”
• Section 2.2.2, “GUI “Window Lift Parameters Configuration” Introduction”
• Section 2.2.3, “GUI “The MM908E624 Board OUTs Controlled by the LIN Bus” Introduction”
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
3
General Description
2.2.1
GUI “Window Lift Application Controlled by the LIN Bus”
Introduction
This GUI offers the user to control the MM908E624 board as the Car Door Window Lift application. The
system features are as follows:
• LIN bus control:
•
— Run / Stop communication
— Sleep / Wake-up LIN Slaves
MM908E624 Window Lift LIN Slave control:
— Select “Normal” or “Keep Window Speed” MM908E624 board mode. During “Keep Window
Speed” mode, the window glass movement speed is kept independent of the system power
supply voltage variation. The Car Door Window Lift platform has to be adapted to run the
“Keep WIndow Speed” mode.
— Enable / disable window glass soft start / soft stop
— Enable control of the window glass position by the MM908E624 keyboard, realized by two
push buttons, one for “Close Window” and the other for “Open Window” glass movements
(see Figure 3).
— Set the window glass desired position and run the Window Lift mechanism to reach it.
— “Open / Close” and “Open Completely / Close Completely” window
— Display current LIN Master control command, current LIN Slave window status, and LIN
Slave keyboard request.
— Display actual window glass position, Hall sensors pulse half period, and system power
supply voltage (used for demonstration of window glass movement speed independence of the
power supply voltage, when the MM908E624 board is running the “Keep Window Speed”
mode).
— Display window caused stop event (Window antipinch, Hall Port error) and the MM908E624
device analog die status (overvoltage, overtemperature, etc.)
More information on this GUI can be found in the Section 7.2.1, “GUI “Window Lift Application
Controlled by the LIN Bus” Description”.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
General Description
2.2.2
GUI “Window Lift Parameters Configuration” Introduction
This GUI is closely linked to that previously described in Section 2.2.1, “GUI “Window Lift Application
Controlled by the LIN Bus” Introduction”. It enables configuration of the Car Door Window Lift
application strategic parameters, and in that way it allows the user to easily rebuild the application for
another Window Lift platform with similar features as the one used. The GUI offers the following features:
• LIN bus control:
— Run / Stop communication
— Sleep / Wake-up LIN Slaves
• Window Lift parameters configuration:
— Upload Parameters: Load current parameters from LIN Slave to LIN Master
— Assign Maximal Position: Contents of Window position counter is loaded into the Window
maximal position variable. It is used for the Window stop cause (Window antipinch / stall or
Hall error)
— Assign an Antipinch Threshold: Control the antipinch / stall Window mechanism pressure
— Reset Position Counter: Reset the Window actual position counter
— Store Parameters To MM908E624 Flash Memory: Store parameters to the LIN Slave
(908EY16) Flash memory.
More information on this GUI can be found in Section 7.2.2, “GUI “Window Lift Parameters
Configuration” Description”.
2.2.3
GUI “The MM908E624 Board OUTs Controlled by the LIN
Bus” Introduction
This GUI introduces the MM908E624 board as a general-purpose OUTs voltage polarity and PWM
controller. Offered features are as follows:
• LIN bus control:
— Run / Stop communication
— Sleep / Wake-up LIN Slaves
• The MM908E624 board OUTs control:
— Board relay ON / OFF control
— OUTs PWM control (duty cycle step approximately 0.4%)
— Display system power supply voltage and MM908E624 device status (overvoltage,
overtemperature, etc.)
More information on this GUI can be found in Section 7.2.3, “GUI “The MM908E624 OUTs Controlled
by the LIN Bus” Description”.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
5
Freescale Tools Used
3
Freescale Tools Used
3.1
FreeMASTER Tool
The FreeMASTER (formerly known as PC Master) software is one of the off-chip drivers, which support
communication between the target microcontroller and PC. This tool allows the programmer to remotely
control an application using a user-friendly graphical environment running on a PC. It also provides the
ability to view some real-time application variables in both text and graphical form. It provides a lot of key
features, including: Real-time debugging, Diagnostic tool, Demonstration tool, Education tool, etc.
The Window Lift application FreeMASTER tool utilization is depicted in Figure 3. Once the
FreeMASTER is installed with the BDM plug-in module1 and running on PC, it communicates with the
target device via the data line using the BDM HC(S)12 multilink2. The FreeMASTER tool reads and writes
the loaded target variables contents (target memory cells) and displays them in the GUI realized by the
HTML page.
Personal Computer (PC)
HTML Page
(GUI)
Target Board
Data Line Created by
HC(S)12 BDM Multilink
PC Parallel Port
or USB
BDM
Header
MC9S12C32
LINkit
FreeMASTER
Tool
Figure 3. FreeMASTER Utilization Description
The FreeMASTER also enables the user to display loaded data in the Oscilloscope GUI component, which
enables displaying real time events in a graph and in the Recorder GUI component, which is helpful during
the fast speed events triggering. However, it is necessary to check if the installed plug-in module enables
running the FreeMASTER oscilloscope and recorder tools also.
Freescale offers FreeMASTER tool support as follows:
•
•
•
•
•
FreeMASTER — PC side application
FreeMASTER — embedded side drivers (MCU / DSP family)
Application notes
Plug-in modules (RS232, BDM, JTAG, CAN)
Application support from Freescale Semiconductor
For more information on the FreeMASTER tool, see Reference [7.].
1. Check if the required plug-in module enables running the FreeMASTER oscilloscope and recorder tools also.
2. The data line can also be realized by RS232, JTAG, and CAN, if the target board enables it.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
6
Freescale Semiconductor
Freescale Components Used
4
Freescale Components Used
4.1
MM908E624 Integrated Triple High-Side Switch with
Embedded MCU and LIN Serial Communication for
Relay Drivers
The MM908E624 is an integrated single-package solution that includes a high performance HC08
microcontroller with a SMARTMOS™ analog control IC (see Figure 4).
The HC08 includes:
• Flash memory
• Timers (TIMA, TIMB)
• Enhanced serial communications interface (ESCI)
• Analog-to-digital converter (ADC)
• Serial peripheral interface (SPI) (only internal)
• An internal clock generator module (ICG).
For more information on the MCU, see Reference [2.].
The analog control die provides:
• Three high-side outputs with diagnostic functions
•
•
•
•
Voltage regulator
Window watchdog
Operational amplifier
Local interconnect network (LIN) physical layer
The single-package solution, together with LIN, provides optimal application performance adjustments
and a space-saving PCB design. It is well suited to the control of automotive high-current motors
applications using relays (e.g., window lifts, sun roofs, fans).
The MM908E624 features:
• High-Performance MC68HC908EY16 MCU:
— 15872 Bytes of On-Chip Flash Memory with in-circuit programming,
— 512 Bytes of On-Chip RAM,
— Internal Clock Generator Module (ICG) with a trimming capability of better than 1 percent,
— Two 16-bit, 2-channel timer (TIMA and TIMB) interface modules with selectable input
capture, output compare, and pulse-width modulation (PWM) capability on each channel,
— Timebase Module (TBM),
— 8-channel, 10-bit successive approximation analog-to-digital converter (ADC),
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
7
Freescale Components Used
— Enhanced serial communications interface module (ESCI) suited to Local Interconnect
Network (LIN) connectivity,
— Serial peripheral interface (SPI),
— 5-bit keyboard interrupt (KBI) with wake-up feature,
— Low Voltage Inhibit module (LVI),
•
— Computer Operating Properly Module (COP).
SMARTMOSTM analog control IC:
—
—
—
—
—
—
LIN Physical Layer,
Low Drop Voltage Regulator,
Operational Amplifier,
Window Watchdog,
Three High-Side Outputs,
Two Wake-Up Inputs.
The MM908E624 SPI and ESCI modules are utilized for communication between the MCU die and the
Analog die. The SPI module controls the Analog die. The LIN physical layer, which is a part of the Analog
die, is controlled by the MCU ESCI module to allow device LIN connectivity.
For more information on the MM908E624, see Reference [1.], Reference [2.], and Reference [9.].
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
PTA0/KBD0
Control and Status Register, 64 Bytes
OSC2
Window
Watchdog
OSC1
RST
24 Internal System
Integration Module
Serial Peripheral
Interface Module
IRQ
Single External IRQ
Module
Configuration Register
Module
10-Bit Analog-to-Digital
Converter Module
Periodic Wakeup Timebase
Module
POWER
Arbiter
Module
Power-On Reset
Module
Prescaler
Module
VREFH
VDDA
VREFL
VSSA
VDD
Computer Operating
Properly Module
Reset Control
Module
AGND
GND
VSUP2
VSUP1
PWMIN
High Side Driver
and Diagnostic
HS2
High Side Driver
and Diagnostic
PTA6/SS
SS
PTC0/MISO
Security
Module
BEMF
Module
MOSI
PORT C
DDRC
DDRA
PORT A
PTA5/SPSCK
SPSCK
Wake Up
Input 2
L2
PORT D
DDRD
VCC
PTD1/TACH1
+E
Amplifier
PTD0/TACH0
PORT E
–E
DDRE
DDRB
PTB7/AD7/TBCH1
PTB6/AD6/TBCH0
PTB5/AD5
PTB4/AD4
PTB3/AD3
PTB2/AD2
PTB1/AD1
PTB0/AD0
PTC4/OSC1
PTC3/OSC2
PTC2/MCLK
PTC1/MOSI
PTC0/MISO
L1
PTE1/RxD
OUT
PTE2/TxD
MCU Die
Analog Die
9
Figure 4. MM908E624 Block Diagram
Freescale Components Used
PTA6/SS
PTA5/SPSCK
PTA4/KBD4
PTA3/KBD3
PTA2/KBD2
PTA1/KBD1
PTA0/KBD0
Wake Up
Input 1
SPI
and
Mode Control
PTC1/MOSI
PTC3/OSC2
FLSVPP
PWMIN
HS1
MISO
PTC2/MCLK
PTD1/TACH1
RST_A
High Side Driver
and Diagnostic
HS3
VSS
PTC4/OSC1
VDD
PWMIN
Enhanched Serial
Communications Interface
Module
Internal Clock Generator
Module
PORT B
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
2-Channel Timer Interface
Module B
Flash programming (burn in) ROM,
1024 Bytes
PTA4/AD4
PTA7/AD7/TBCH1
Voltage
Regulator
TxD
User RAM, 512 Bytes
PTB3/AD3
PTB6/AD6/TBCH0
IRQ_A
LIN Physical
Layer
PTE0/TxD
2-Channel Timer Interface
Module A
PTB1/AD1
PTB5/AD5
WDCONF
LIN
RxD
PTE1/RxD
PTD0/TACH0
5-Bit Keyboard Interrupt
Module
Monitor ROM, 310 Bytes
PTA4/KBD4
VSUP1
ALU
Control and Status Register, 64 Bytes
PTA1/KBD1
PTA3/KBD3
RST
Single Breakpoint Break
Module
User Flash, 15,872 Bytes
PTA2/KBD2
IRQ
VREFL
VSSA
EVSS
EVDD
VDDA
VREFH
Freescale Semiconductor
M68HC08 CPU
CPU
Registers
Freescale Components Used
4.2
MC9S12C32 16-Bit Microcontroller Unit
The MC9S12C32 (see Figure 5) is a 48/52/80-pin Flash-based Industrial / Automotive network control
MCU, comprised of standard on-chip peripherals including a 16-bit central processing unit (HCS12 CPU),
32K bytes of Flash EEPROM, 2K bytes of RAM, an asynchronous serial communications interface (SCI),
a serial peripheral interface (SPI), an 8-channel 16-bit timer module (TIM), a 6-channel 8-bit Pulse Width
Modulator (PWM), an 8-channel, 10-bit analog-to-digital converter (ADC), and a CAN 2.0 A, B software
compatible module (MSCAN). Furthermore, an on chip bandgap based voltage regulator (VREG)
generates the internal digital supply voltage (VDD) for a 3 V to 5.5V external supply range. The
MC9S12C32 has full 16-bit data paths throughout. The inclusion of a PLL circuit allows power
consumption and performance to be adjusted to suit operational requirements. A total of 50 I/O port pins
and 2 input pins are available in the 80 pin package version. Furthermore, up to 12 I/O port bits are
available with Wake-Up capability from STOP or WAIT mode.
• 16-bit HCS12 core
• Wake-up interrupt inputs:
— Up to 12-port bits available for wake up interrupt function with digital filtering
• Memory:
— 32K Byte Flash EEPROM (erasable in 512-byte sectors)
— 2K Byte RAM
• One Analog-to-Digital Converter 8-channel module with 10-bit resolution with an external
conversion trigger capability
• One 1M bit per second, CAN 2.0 A, B software compatible modules
• 8-Channel Timer Module (TIM)
• 6 PWM channels
• Serial interfaces:
— One asynchronous serial communications interface (SCI)
•
•
•
•
— One synchronous serial peripheral interface (SPI)
CRG (Clock Reset Generator Module)
Operating frequency 25MHz Bus Speed
Internal 2.5V Regulator:
— Includes low voltage reset (LVR) circuitry
— Includes low voltage interrupt (LVI) circuitry
48-Pin LQFP, 52-Pin LQFP, or 80-Pin QFP package:
— Up to 58 I/O lines with 5V input and drive capability (80 pin package)
— Up to 2 dedicated 5V input only lines (IRQ, XIRQ)
— 5V 8 A/D converter inputs,
— 5V I/O
For more information on the MC9S12C32, see Reference [3.].
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Freescale Components Used
PLL 2.5V
VDDPLL
VSSPLL
I/O Driver 5V
VDDX
VSSX
A/D Converter 5V
VDDA
VSSA
PTAD
ADDR7
ADDR6
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
DATA7
DATA6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
Internal Logic 2.5V
VDD1,2
VSS1,2
SPI
PTT
ADDR15
ADDR14
ADDR13
ADDR12
ADDR11
ADDR10
ADDR9
ADDR8
DATA15
DATA14
DATA13
DATA12
DATA11
DATA10
DATA9
DATA8
Multiplexed
Wide Bus
RXD
TXD
SCI
MSCAN
PJ6
PJ7
PTS
PTB
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
DDRB
PTA
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
DDRA
DDRAD
DDRT
PW0
PW1
PW2
PW3
PW4
PW5
TEST/VPP
Multiplexed Address/Data Bus
PP0
PP1
PP2
PP3
PP4
PP5
PP6
PP7
PS0
PS1
PS2
PS3
PTM
PWM
Module
PTP
XIRQ
IRQ
System
R/W
Integration
LSTRB/TAGLO Module
ECLK
(SIM)
MODA/IPIPE0
MODB/IPIPE1
NOACC/XCLKS
PT0
PT1
PT2
PT3
PT4
PT5
PT6
PT7
PM0
PM1
PM2
PM3
PM4
PM5
MUX
RXCAN
TXCAN
MISO
SS
MOSI
SCK
DDRP
COP Watchdog
Clock Monitor
Periodic Interrupt
PAD0
PAD1
PAD2
PAD3
PAD4
PAD5
PAD6
PAD7
PTJ
Timer
Module
Clock and
Reset
Generation
Module
IOC0
IOC1
IOC2
IOC3
IOC4
IOC5
IOC6
IOC7
DDRJ
HCS12
CPU
Key Int Keypad Interrupt
PLL
DDRE
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
2K Byte RAM
PTE
XFC
VDDPLL
VSSPLL
EXTAL
XTAL
RESET
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
32K Byte Flash EEPROM
MODC Background
Debug12 Module
VDDA
VSSA
VRH
VRL
DDRS
Voltage Regulator
VDD2
VSS2
VDD1
VSS1
BKGD
VDDA
VSSA
VRH
VRL
ATD
DDRM
VSSR
VDDR
VDDX
VSSX
Signals shown in Bold are not available on the 52 or 48 Pin Package
Signals shown in Bold Italic are available in the 52, but not the 48 Pin Package
Voltage Regulator 5V & I/O
VDDR
VSSR
VRL is bonded internally to VSSA
for 52 and 48 Pin packages
Figure 5. MC9S12C32 Block Diagram
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
11
Freescale Components Used
4.3
LIN Physical Interface MC33399
This component (depicted in Figure 6) is designed for use in Master and Slave LIN nodes as a bus voltage
converter with an implemented bus wake-up capability (see Reference [4.]).
Device features:
• Communication speed of up to 20kb/s
• Interfaces to the MCU with CMOS compatible I/O pins
• Two operational modes: Normal and Sleep
•
•
•
•
•
Very low standby current of 20uA during Sleep mode
An unpowered node does not disturb the LIN network
Wake up capability from the LIN bus, MCU, or by high voltage on the wake-up pin
Controls an external voltage regulator
High EMC immunity
Wake
VSUP
MC33399
INH
Wake up
V-Reg Cntrl
EN
V. Ref
Bias
30 k
Logic
Rxd
Receiver
LIN
Protection
Txd
Driver
GND
Figure 6. MC33399 (LIN Physical Interface) Block Diagram
NOTE
The new eLIN physical interface MC33661 (see Reference [5.]) fully
replaces the MC33399 described above1. With a signal slew rate selection
option, active bus signal shaping, and a special mode for operating above
100kb/s for testing and programming, it provides an excellent EMC
behavior and capability for via the LIN bus Master / Slave node MCU
memory programming.
1. On the LINkit Slave board, replacing the MC33399 by the MC33661 requires adding a 10kΩ resistor between the MC33661
INH pin and LT1121 /SHDN pin, because of the MC33661 higher INH pin drive capability.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
12
Freescale Semiconductor
Hardware Description
5
Hardware Description
5.1
MM908E624 Board
The board “heart” (see Figure 7) is the MM908E624 single-package solution, consisting of an 8-bit MCU
and an analog die with integrated LIN physical interface, power supply management, window watchdog,
operational amplifier, and I/O control (see Section 4.1, “MM908E624 Integrated Triple High-Side Switch
with Embedded MCU and LIN Serial Communication for Relay Drivers”).
Hall Port
MM908E624 Analog Die
Watchdog Disabled (JP1)
Push-button Keyboard
OUT1
MON08
Multilink
Header
OUT2
MM908E624
LEDs
LIN Connector
Power Supply Connector
Figure 7. MM908E624 Board Description
The MM908E624 board (see also the schematic in Figure 8) was designed to enable the MM908E624
Window Lift / Sun Roof control. It offers to control the OUT1, OUT2 output voltage (+12V or GND) using
the K1 relay, and to PWM control the output voltage duty cycle, realized by the Q1 MOSFET transistor.
The board also provides the possibility to read three pin (voltage coded) Hall sensors for to evaluate e.g.,
window position or window antipinch / stall condition.
The board D2 LED displays the current MM908E624 device state. If the D2 LED is turned ON, the device
is running. Otherwise, if switched OFF, the MM908E624 device is ether in Sleep mode or the device
supply power is not connected.
The D3 and D4 LEDs display the board’s OUTs state. When the D3 or D4 LED is switched ON, the
corresponding board OUT is supplied from the power supply. Otherwise, the OUT is connected to the
power supply ground wire.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
13
Hardware Description
14
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
Figure 8. MM908E624 Board Schematic
Hardware Description
The MM908E624 board interfaces with the rest of the LIN network by 4-pin LIN connector J2, which can
also be used as the board power supply input. If any extra supply power is needed, the J1 connector was
added to handle the high current power supply, e.g., in cases where, the LIN power supply wire is not
capable of managing the supply current.
In some applications it can be useful to measure the supply voltage. For this purpose a voltage divider
circuit with protection circuit (R9, R10, R11, C9 and D7) is included on the board. The measurable
maximum supply voltage is 15 V.
To show the MM908E624 board “keyboard” control and device wake-up capability, a single push button
keyboard, consisting of buttons S1, S2 was added (push S1 to Open Window, push S2 to Close Window).
For downloading the MCU program code, the standard 16-pin HC(S)08 multilink header J3 is included on
board.
The MM908E624 board Hall Port header, LIN, and Power Supply connectors interface are depicted in
Figure 9. For more information, also see Appendix B, “System Setup”.
Hall Port Header
(Top View)
Power Supply
Connector
(Front View)
LIN Connector
(Front View)
J4
VSUP
GND
Hall 2 Input
Hall 1 Input
Power Supply
for Hall Sensors
Header Orientation Mark
SIO
GND
MM908E624 Board
Figure 9. MM908E624 Board Connectors Interface Description
The MM908E624 board features are as follows:
• Power supply voltage range: from 5.5V to 18 V
• Power supply current1: cca. 22 mA (the MM908E624 device takes cca. 20 mA, the power supply
measurement circuit takes cca. 2mA)
• Maximal OUTs continuous current2: up to 15 A
•
Maximal OUTs inrush current3: up to 25 A
1. The typical value of the MM908E624 board power supply current at the following conditions:
— The MM908E624 board power supply voltage equals 13.5V,
— The board OUTs are OFF, MOSFET Q1 is OFF, Hall port is OFF, and LEDs are OFF,
— The MM908E624 analog chip runs in normal mode,
— The MM908E624 MCU (908EY16) is running with 20MHz internal core clock generated by ICG module,
— The MCU ICG, TIMA, TIMB, TBM, ESCI, SPI, ADC, and I/O modules are enabled.
2. The board MOSFET Q1 turned ON, no Q1 PWM duty cycle control applied,
3. The board MOSFET Q1 turned ON, no Q1 PWM duty cycle control applied.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
15
Hardware Description
For the MM908E624 board OUTs PWM duty cycle control, the MOSFET Q1 power dissipation has to be
calculated. The calculated value should not exceed maximal limit, otherwise the MOSFET Q1 will be
destroyed.
The MOSFET Q1 maximal power dissipation calculation is based on the known value of the Q1 package
thermal resistance. The Q1 type SPP73N03S2L, the thermal resistances are as follows:
•
Between the chip junction and package case: Rthjc = 1.6K/W
•
•
Estimated value between package case and cooler: Rthcc = 0.4K/W
Between the cooler and ambient: Rthca = 20K/W
The Q1 MOSFET total thermal resistance RthQ1 [K/W] equals to sum all mentioned thermal resistances:
R thQ1 = R thjc + R thcc + R thca = 1, 6 + 0, 4 + 20 = 22
Eqn. 1
The Q1 MOSFET maximal power dissipation PQ1max [W] can be calculated according to the following
formula:
T jmax – T amb
P Q1max = -----------------------------------R thQ1
Eqn. 2
where:
Tjmax — maximal operating temperature [°C] (175°C for SPP73N03S2L),
Tamb — ambient temperature [°C],
RthQ1 — total thermal resistance [Ω].
The Q1 MOSFET power dissipation consists mainly of resistive PQ1res [W] and switching PQ1sw [W]
losses:
Eqn. 3
P Q1 = P Q1res + P Q1sw
The switching losses of the Q1 PQ1sw [W] can be calculated by the following formula:
V sup ⋅ I load
P Q1sw = ------------------------------- ⋅ ( t r + t f ) ⋅ f sw
2
Eqn. 4
where:
Vsup — power supply voltage [V],
Iload — maximal load current [A],
tr — Q1 drain-source current rise time [s],
tf — Q1 drain-source current fall time [s],
fsw — Q1 switching frequency [Hz].
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Hardware Description
The resistive losses of the Q1 PQ1res [W] can be calculated:
2
P Q1max = I loadrms ⋅ R DSON
Eqn. 5
where:
Iloadrms — rms value of load current [A],
RDSON — Q1 drain to source ON resistance [Ω] at operating temperature.
The Q1 MOSFET RDSON [Ω] value is dependent on the operating temperature. For the RDSON
re-calculation, it is possible use the following formula:
R DSON = R DSONspec ⋅ ( 1 + 0, 005 ⋅ ( T op – T spec ) )
Eqn. 6
where:
RDSONspec — Q1 drain-source ON resistance [Ω] at temperature Tspec [°C] (usually 25°C),
Top — Q1 operating temperature [°C].
5.2
MC9S12C32 LINkit Board
For the Window Lift LIN Master device, the MC9S12C32 LINkit board is used (see Figure 10).
BDM Multilink Header
Power Supply Connector
RS232 Physical Interface
LEDs
LIN Connector
LIN Connector
Interface
(Front View)
MC9S12C32
VSUP
SIO
CAN Physical Interface MC33388
Power Supply LED
LIN Physical Interface MC33399 or MC33661
GND
Figure 10. MC9S12C32 LINkit Board Description
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
17
Hardware Description
The MC9S12C32 Master LINkit (see also LINkit schematic in Figure 11) consists of the 16-bit
MC9S12C32 MCU, physical interfaces for CAN, RS232 and LIN connectivity, and the power supply
management. The MC9S12C32 LINkit board conception is closely linked to the expectation that the LIN
Master can also act as the LIN to a superior bus gateway, e.g. as in the case of the MC9S12C32 LINkit,
the LIN to CAN gateway.
The MC34064 device is also included on the LINkit board, to secure the proper MCU start after a low
power voltage condition has occurred. To obtain more information on this topic, see Reference [12.].
The MC9S12C32 LINkit was designed to be capable of the LIN network power supply. Let’s consider that
the power supply current of the LINkit board with the BDM multilink connected is about 200mA and the
on board fuse F1 is limiting the power supply current to 500mA (see schematic in Figure 11). The
remaining LINkit board power supply capability is about 300mA. This enables running an application only
in demonstration mode without any real Window Lift system connection. In order to show this board as
the real Window Lift LIN Master, the board is supplied from the MM908E624 board by the LIN bus. The
MM908E624 board includes an extra connector, J1 (see schematic in Figure 8), for the high power supply
current management.
For downloading the MCU program code, a standard 6-pin HC(S)12 BDM multilink header is included
on board.
5.3
Car Door Window Lift Platform
The Window Lift application was developed for the control of a Window Lift driven by a 12V DC motor
and controlled by two separate three pin Hall sensors. The Hall pulse period generated by the Car Door
Window Lift platform used, corresponds to a window glass shift of 1mm.
The Window Lift application uses Hall sensor signals for:
•
•
•
Window movement direction control (Open / Close)
The actual window position reading
Window glass antipinch and stall detection
To obtain more information on system setup, see Appendix B, “System Setup”.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Freescale Semiconductor
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Hardware Description
19
Figure 11. MC9S12C32 LINkit Board Schematic
Software Description
6
Software Description
6.1
LIN Slave Software Arrangement
6.1.1
General Description
The LIN Slave software can be separated into two main parts. The first covers the LIN connectivity related
routines, the second covers the application itself. Figure 12 displays how the project folders are arranged
in the Metrowerks CodeWarrior Stationary.
Figure 12. LIN Slave Metrowerks CodeWarrior Stationary
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
6.1.2
LIN Connectivity Related Routines
The LIN connectivity software covers all LIN communication (see Appendix A, “Messaging Strategy”).
The application controls LIN communication by the receiver and the transmitter signal command buffers
and flags. The LIN communication runs at 9.6 kBd.
The LIN connectivity is implemented using the Freescale LIN 1.3 driver software package, which is
available free of charge on the Freescale web pages detailed in Reference [11.].
In the project directory, the Freescale LIN 1.3 driver package is represented by folders as follows:
• Driver configuration: This folder includes the l_gen.c file that together with the l_gen.h file
interfaces the LIN driver to an application. Those files are written in LIN API and user accessible
to allow LIN network modification,
• Driver source: This folder includes LIN1.3 driver source files.
6.1.3
Application Software
The application software controls the Car Door Window Lift platform according to the LIN Master node
commands (see Appendix A, “Messaging Strategy”).
The functions provided are as follows:
• Moving the window glass:
— Close / open,
— Close completely / open completely,
— Reach desired position,
— Enable control of window glass position by the MM908E624 board push button keyboard,
— Window soft start / soft stop (done by MOSFET Q1 OUTs PWM ramp control).
• Reporting current window status:
— Closed completely / opened completely,
— Closing / opening,
— Stopped,
— Window reached desired position and it was stopped (realized by Hall sensors signal
evaluation),
— Window antipinch / stall occurred and window was stopped,
— Window position (measured in Hall signal pulse half periods),
— Hall signal half pulse period measurement.
• Reporting MM908E624 board status:
— Board keyboard status (LIN Slave requirement to Open / Close / Stop window movement)
— Board power supply measurement,
— MM908E624 device report (High Sides over-temperature, Voltage Regulator
over-temperature, Power supply Low / High Voltage, MM908E624 LIN layer overcurrent /
overvoltage).
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
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Software Description
The application software can be run in three different modes:
1. Normal mode (see Section 2.2.1, “GUI “Window Lift Application Controlled by the LIN Bus”
Introduction” and Section 7.2.1, “GUI “Window Lift Application Controlled by the LIN Bus”
Description”),
2. Keep Window Speed mode (see Section 2.2.1, “GUI “Window Lift Application Controlled by the
LIN Bus” Introduction” and Section 7.2.2, “GUI “Window Lift Parameters Configuration”
Description”),
3. PWM Control mode (see Section 2.2.3, “GUI “The MM908E624 Board OUTs Controlled by the
LIN Bus” Introduction” and Section 7.2.3, “GUI “The MM908E624 OUTs Controlled by the LIN
Bus” Description”).
The application software is represented in the project directory by the files:
• Sources:
— slave.c and slave.h (main application files),
— target.h (target dependent stuff),
— hallport_signal_eval.c and hallport_signal_eval.h (related to the Hall port signals evaluation),
— motor_control.c and motor_control.h (Window Lift DC motor control - rotation direction and
speed control),
— lin_control.c and lin_control.h (LIN connectivity related files),
— parameter.c and parameter.h (system parameters Flash store / read related routines),
— flash.c and flash .h (Flash store and read execution related routines),
— timer.c and timer.h (TIMA, TIMB, TBM initialization),
— adc.c and adc.h (ADC conversion related routines),
— spi.c and spi.h (SPI related routines).
6.1.4
Application Software Configuration Files
The application software is linked with the MM908E624 hardware by target.c file. This file includes
macro declaration that determines the behavior of the Window Lift / Sun Roof application. The most
important macros are:
• ANTIPINCH_OR_STALL_THR: It defines the number of successful antipinch / stall detection
cycles to arise an application window antipinch or stall evaluation process. One antipinch / stall
detection cycle is executed if the measured difference of two following Hall1 pulse periods
exceed the limit value preset in the system parameter structure (called sParameter.tickDifThr).
The parameter value can also be updated by means of the GUI described in Section 2.2.2, “GUI
“Window Lift Parameters Configuration” Introduction”, Assign an Antipinch Threshold variable.
A value entered equals the number of TIMB ticks,
• STALL_THR: It defines the zone of window stall detection to enable window control, if the
window is completely opened or closed. The value is entered as a number of TIMB channel0
interrupts. During the interrupt code execution, the window glass position counter is also
incremented / decremented,
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
•
•
•
•
•
•
•
•
•
•
•
PWM_DUTY_MIN_STOP: It equals the minimal OUTs PWM duty cycle, when a window
movement soft stop command is executed,
PWM_DUTY_MIN_POS: It defines the minimal OUTs PWM duty cycle when a window go to
desired position command is executed and the window position is close to a window soft stop
execution. The value entered is the OUTs PWM duty cycle in which the window reaches the
desired position,
PWM_DUTY_MAX: The maximal OUTs PWM duty cycle during the window soft start
command execution. When the OUTs PWM ramp duty cycle reaches this maximal value, it is
automatically set to 100% to enable running the window with full platform mechanism strength,
PWM_RAMPSTEP: It determines the OUTs PWM ramp step,
PWM_SPEEDSTEP: This is the PWM duty cycle step during the MM908E624 board “Keep
Window Speed” mode execution, which enables keeping the window movement speed
independent to the power supply voltage variation,
PWM_DUTY_UPDATE: It defines the timebase of OUTs PWM duty cycle updates during device
“Keep Window Speed” mode execution. The least timebase period step equals the TBM module
interrupt period execution,
TICK_TO_PWM_START: It determines the number of TIMB channel0 interrupts (equals to
window position counts) when, during a soft stop window or go to desired position command
execution, the OUTs PWM duty cycle ramp generation will be started,
TICK_WIDTH: It equals a Hall1 pulse period that the application software keeps constant by the
OUTs PWM duty cycle control during a device “Keep Window Speed” MM908E624 mode
execution,
HALL_PORT_NONE_SIGNAL: Number of TBM arrised interrupts when “None Signal on Hall
port” is detected,
TIME_TO_START_ANTIPINCH: Number of TBM arrised interrupts when the window
antipinch / stall detection execution is enabled,
COUNTS_TO_START_ANTIPINCH: Number of TIMB channel0 interrupts (equals to window
position counts), when the window antipinch / stall detection execution will be started.
The MM908E624 LIN connectivity can be configured in the lin_control.h file. The defines are as follows:
• LIN_WL_SLAVE_LEFT1: By defining this symbol, the MM908E624 node acts like a Left
Window Lift Slave node,
• LIN_WL_SLAVE_RIGHT 2: By defining this symbol, the MM908E624 node acts like a Right
Window Lift Slave node,
• ARBITER_DATA_USED: The ESCI arbiter data are used for the difference between the current
and desired MCU bus clock frequency calculation. The operation result determines the system
variables correction result. This macro always has to be defined to allow proper Window Lift
system functionality,
1. The LIN_WL_SLAVE_LEFT define must be commented, if the MM908E624 board should acts as the Right Window Lift LIN
Slave node.
2. The MM908E624 board can perform either as a Right or Left Window Lift Slave node. Both nodes are not allowed to run on
one MM908E624 board at the same time.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
23
Software Description
•
•
6.2
6.2.1
CHECKSUM_OVER_THE_ID: Uncomment this enables calculating LIN frames checksum over
the frame identifier and data, to keep the frame structure LIN 2.0 Specification compliant.
However, it is also necessary to mention that the LIN Slave software is not LIN 2.0 complaint
because the node configuration, which is mandatory for a LIN 2.0 devices, is not implemented
(see Reference [13.]). The MM908E624 board can act as a LIN 2.0 compliant device, if the LIN
2.0 drivers are implemented in the node (see Reference [14.] and Reference [15.]),
EY16_BREAKDELIMITER_WORKAROUND: Uncomment this enables the
MC68HC908EY16 LIN Break Delimiter Recognition issue workaround. The LIN Break
Delimiter Recognition issue can arise when the LIN Slave ESCI clock is slower than the LIN
Master SCI clock, the break delimiter signal ("1") is just one bit long and the break signal ("0") is
1x.5 bit long (for more information see Reference [16.]). This define should always be
uncommented to enable proper LIN 1.3 driver functionality.
LIN Slave Software Description
Application Software Main Code
An application main loop software is the part of the application code written in file slave.c. The main loop
flow chart is depicted in Figure 13.
The main application code consist of two independent blocks. The first code block serves the MM908E624
board initialization, the second code block is represented by the main code loop, which controls the
MM908E624 board LIN connectivity and an application performance.
The LIN connectivity is realized by the LIN 1.3 Freescale driver for HC(S)08 microcontrollers, which is
downloadable from the Freescale web pages (see Reference [11.]) free of charge. As an example of LIN
1.3 driver usage, the LIN API driver software interface was chosen for the LIN Slave node application
utilization. To introduce also the other LIN1.3 driver software interface utilization, the LIN Master node
application uses the Freescale API. To obtain more information on application LIN connectivity, see
Appendix A, “Messaging Strategy” also.
To keep the LIN Slave node functionality compliant to the LIN 1.3 Specification (see Reference [6.]), the
MM908E624 board enters the low power mode (Sleep mode), if that is required by the LIN Master or if a
no LIN bus activity 2.6sec1. period has expired. The LIN Slave can be woken up either by the LIN Master,
issuing a LIN Wake-up frame, or by the action of the MM908E624 board push button keyboard, which
causes the MM908E624 device to wake-up with a consequential LIN bus Wake-up frame issue.
The MM908E624 LIN Slave board provides the LIN Master with information on power supply voltage
and MM908E624 analog die status (over-voltage, over-temperature, etc.) reports.
1. The LIN1.3 Protocol Specification (see Reference [6.]) assigns the LIN bus Idle timeout as 25000 of Tbit time. An application
LIN communication runs at 9.6KBd, i.e. Tbit = 1/ fBR = 1 / 9600 = 104us. The LIN bus timeout Tout = 25000 * 104us = 2.6sec.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
During the main loop execution system variables (e.g. the antipinch threshold) are also re-calculated, to
keep the Window Lift application independent of the MM908E624 MCU (EY16) bus clock frequency. The
source of the bus clock, Internal Clock Generator (ICG), runs within the frequency tolerance +/-25%. The
LIN connectivity correct functionality in so wide a bus clock frequency margin is enabled by using the
ESCI module with a fine adjust prescaler and an arbiter module, which it is used as the LIN bit time period
measurement unit during LIN frame synchronization field reception (see Reference [6.]). The currently
measured LIN bit time period is processed by the Window Lift application software to obtain the
difference value between the desired and running bus clock frequency. The calculation result is used as the
reference value for the system variables re-calculation.
The MM908E624 board was designed to run the Window Lift and the Sun Roof applications, that use the
Hall sensors control. Those device utilizations are covered by application software running in the
following modes:
• Normal,
• Keep Window Speed.
To obtain more information on the MM908E624 board performance running in Normal mode, see
Section 2.2.1, “GUI “Window Lift Application Controlled by the LIN Bus” Introduction”, Section 7.2.1,
“GUI “Window Lift Application Controlled by the LIN Bus” Description”, and Section 6.2.3,
“Application Software Stream During Device “Normal” Mode”. The MM908E624 board performance
during device “Keep Window Speed” mode is represented by chapters Section 2.2.2, “GUI “Window Lift
Parameters Configuration” Introduction”, Section 7.2.2, “GUI “Window Lift Parameters Configuration”
Description”, and Section 6.2.4, “Application Software Stream During Device “Keep Window Speed”
Mode” as well.
The MM908E624 single-package solution can also be used in each application where OUTs relay control,
with or without OUTs PWM control, is required. To introduce this device capability, the MM908E624
board software can also be run in mode:
• PWM Control.
To obtain detailed information on the MM908E624 board functionality, see Section 2.2.3, “GUI “The
MM908E624 Board OUTs Controlled by the LIN Bus” Introduction”, Section 7.2.3, “GUI “The
MM908E624 OUTs Controlled by the LIN Bus” Description”, and Section 6.2.5, “Application Software
Stream During Device “PWM Control” Mode” as well.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
25
Software Description
Figure 13. LIN Slave Main Loop Flow Chart
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
6.2.2
Application Interrupts
There are four sources of the MCU interrupts (see Figure 14):
1. TBM isr: Timebase module interrupt acts as an application timebase source. During the interrupt
code execution, the LIN bus no activity counter is updated to enable the device to enter sleep mode.
It also updates the current board OUTs PWM duty cycle, if either a window soft start or soft stop
is processed. During a window movement start, the window antipinch is disabled for the last 4mm
of window movement. To protect the Window Lift / Sun Roof application against damage, if for
some reason the antipinch is not enabled after 4mm of window movement, a period of
approximately 170ms antipinch disable is added and is periodically updated during TBM interrupt
service routine processing. The window stall detection is based on the Hall port signal control and
last window glass position evaluation,
2. ESCI isr: ESCI receive and error interrupt is occupied by Freescale LIN 1.3 driver to run the
application LIN connectivity. During an interrupt execution, the LIN bus no activity counter is
loaded with an initial value to postpone the device sleep mode entry,
3. TIMB channel0 isr: TIMB channel0 interrupt is captured on a Hall1 sensor signal pulse falling or
rising edge. During an interrupt code execution, the window position counter is updated, the Hall2
signal state is read to evaluate the window movement direction, the TIMB channel 0 register is
read, whose value is used for the window antipinch / stall detection and the Hall1 pulse period
measurement (necessary for correct window movement speed control during device “Keep
Window Speed” mode execution),
4. IRQ isr: the MCU external interrupt connects the MM908E624 analog die with the MCU to
provide information on Analog die faults. The IRQ arises, if any Analog die hardware error
occurs (over-voltage, over-temperature, etc.). During the interrupt request serving, all activities
are stopped and system parameters are stored into MCU Flash memory as a preventative action
before a possible system failure.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
27
Software Description
Figure 14. LIN Slave System Interrupts Flow Chart
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
6.2.3
Application Software Stream During Device “Normal” Mode
The MM908E624 board “Normal” mode represents standard MM908E624 utilization. This mode offers
the user, by single LIN command, control of the Window Lift / Sun Roof window glass position with or
without the soft start / soft stop control, which is done by the OUTs PWM ramp processing. The OUTs
ramp control during window soft start / soft stop helps to reduce system electromagnetic emissions and
also enables starting and stopping the window more fluently. The application features detailed description
can be found in Section 2.2.1, “GUI “Window Lift Application Controlled by the LIN Bus” Introduction”
and Section 7.2.1, “GUI “Window Lift Application Controlled by the LIN Bus” Description”.
The “Normal” mode application software controls the board OUTs voltage polarity, to enable control of
Window LIft / Sun Roof motor rotation in both directions. This control is realized by switching relay K1
contacts (see schematic in Figure 8). The MOSFET Q1 is used for OUTs PWM ramp duty cycle control
during window glass soft start / soft stop processing. The ramp is initialized, when a new window control
command is received by the LIN bus with the OUTs ramp control request bit set. If no window soft start /
soft stop is required, the Q1 is turned ON.
The OUTs PWM ramp processing is controlled by the TBM interrupt service routine. During TBM
interrupt service routine execution, the current OUTs PWM duty cycle is evaluated. If the PWM duty cycle
equals a preset, PWM ramp update is stopped and the OUTs are either ON, if the last received window
command requires a window run, or OFF, if the last command requires a window stop.
When moving the window, the Hall port signals are processed to enable the window glass movement
direction, window glass position, and window glass antipinch / stall control. The Hall port signal
evaluation is based on the edge triggered TIMB channel0 interrupt execution, which it is described in
Section 6.2.2, “Application Interrupts”. The window glass antipinch / stall detection is realized by the
following Hall signal periods difference calculation. This calculated difference is compared to a threshold
limit (see Section 2.2.2, “GUI “Window Lift Parameters Configuration” Introduction” and Section 7.2.2,
“GUI “Window Lift Parameters Configuration” Description”, parameter Assign an Antipinch Threshold),
which can be adjusted by an application user to enable window glass antipinch / stall pressure control. The
window glass antipinch / stall control is disabled for the last 4mm of window glass movement during start
and stop processing to enable a fully close window.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
29
Software Description
Figure 15. LIN Slave “Normal” Mode Flow Chart
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
6.2.4
Application Software Stream During Device “Keep Window
Speed” Mode
The “Keep Window Speed” mode was added to the Window Lift / Sun Roof application to show the
possibility of Window Lift / Sun Roof window movement speed control, which in this case makes the
window glass movement speed independent of the power supply voltage. This process enables the Hall1
pulse period measurement, which is done by an edge triggered TIMB channel0 interrupt execution (see
Section 6.2.2, “Application Interrupts”). The measured period is compared with the one predefined. The
comparison result determines, if the OUTs PWM duty cycle will be increased or decreased. This process
observes the time schedule based on the TBM interrupt execution. The OUTs PWM duty cycle update is
disabled when the possibility of a window antipinch / stall arises (see Figure 16).
The MM908E624 board “Keep Window Speed” mode offers the user analogous Window Lift control as
in the “Normal” mode. From an application user point of view, there is only one difference in application
control, in that the window glass sort start / soft stop can not be disabled. This links to the “Keep Window
Speed” application utilization in the High-End Window Lifts, where the soft start / soft stop feature can be
taken as an obvious window glass start / stop process execution. The window soft start / soft stop process
helps to reduce system EMC emission and the window glass movement start / stop is also more fluent than
in “Normal” mode.
As in the case of MM908E624 board “Normal” mode, antipinch / stall detection is disabled for the last
4mm of window glass movement in window start / stop process execution to enable closing the window
completely.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
31
Software Description
Figure 16. LIN Slave “Keep Window Speed” Mode Flow Chart
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
6.2.5
Application Software Stream During Device “PWM Control”
Mode
The MM908E624 board “PWM Control” mode introduces the MM908E624 as a general purpose relay
driver. It controls the board OUTs voltage polarity by relay K1 (see Figure 8) and also the OUTs PWM
duty cycle, if required. This enables using the MM908E624 in each application where it is necessary to
control high current loads or where the OUTs relay control is from some reason suitable (e.g., control
circuit and load circuits galvanic separation is needed).
Figure 17. LIN Slave “PWM Control” Mode Flow Chart
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
33
Software Description
6.3
LIN Master Software Arrangement
The LIN Master Software can be separated in two main parts. The first part covers the Master node LIN
connectivity, the second part interfaces the LIN communication schedule and the contents of frames issued
to the FreeMASTER tool. Both those parts create one unit capable of allowing the user to control the LIN
Master node connectivity by intelligent GUIs running in the FreeMASTER tool (see Section 2.2, “System
Features”).
Figure 18. LIN Master Metrowerks CodeWarrior Stationary
6.3.1
LIN Connectivity Related Routines
The LIN connectivity software covers all LIN communication (see Appendix A, “Messaging Strategy”).
The Window Lift application controls LIN communication by the receiver and the transmitter signal
command buffers and flags. The LIN connectivity runs at 9.6 kBd.
The node LIN connectivity is implemented using the Freescale 1.3 driver software package (see Reference
[11.]), which is available on the Freescale web pages (see Reference [10.]) free of charge.
In the project directory, the Freescale LIN 1.3 driver package is represented by folders as follows:
• Driver configuration: This folder includes the master.cfg and master.id files, which together
enable the LIN driver configuration. Those files are user accessible to allow the Master node LIN
connectivity modification,
• Driver source: This folder includes the LIN driver source files.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
Software Description
6.3.2
Application Software
The application LIN Master software enables control of the scheduling and contents of transmitted and
received LIN frames via intelligent GUIs running in the FreeMASTER tool (see Section 2.2, “System
Features”, Section 7.2, “GUIs General Description”, and Appendix A, “Messaging Strategy”).
The LIN Master software enables running the MM908E624 board LIN Slave application software in
several different modes:
• Normal mode (see Section 2.2.1, “GUI “Window Lift Application Controlled by the LIN Bus”
Introduction” and Section 7.2.1, “GUI “Window Lift Application Controlled by the LIN Bus”
Description”)
• Keep Window Speed mode (see Section 2.2.1, “GUI “Window Lift Application Controlled by the
LIN Bus” Introduction” and Section 7.2.2, “GUI “Window Lift Parameters Configuration”
Description”)
• PWM Control mode (see Section 2.2.3, “GUI “The MM908E624 Board OUTs Controlled by the
LIN Bus” Introduction” and Section 7.2.3, “GUI “The MM908E624 OUTs Controlled by the LIN
Bus” Description”)
The LIN Master application software is represented in the project directory by the folder:
• Sources:
— master.c and master.h (an application main file)
— lin_control.c and lin_control.h (LIN connectivity related files)
6.3.3
Application Software Configuration Files
The MC9S12C32 LIN connectivity can be configured in the lin_control.h file. The definitions are as
follows:
• CHECKSUM_OVER_THE_ID: By defining, this enables the LIN frames checksum over the
frame identificator and data calculation, to keep the frame structure LIN 2.0 Specification
compliant. However, it is also necessary to mention that the LIN Slave software is not LIN 2.0
complaint because the node configuration, which is mandatory for the LIN 2.0 devices, is not
implemented (see Reference [13.]). The MC9S12C32 LINkit board can act as a LIN 2.0
compliant device, if the LIN 2.0 drivers are implemented in node (see Reference [14.] and
Reference [15.]).
• SLAVE_WAKEUP_MASTER: The Freescale LIN 1.3 driver does not includes the procedure for
the LIN Master wake-up, when the LIN Slave has issued the LIN Wake-Up frame. This define
enables reading ESCI module received data. The routine for a LIN Master wake-up by a LIN
Slave can be found in the lin_control.c file. This define has to be always defined to ensure proper
LIN Master functionality.
• LIN_PHYS_LAYER_MC33399: Define this, if the MC9S12C32 LINkit board is populated by a
MC33399 LIN physical layer1.
• LIN_PHYS_LAYER_MC33661: Define this, if the MC9S12C32 LINkit board is populated by a
MC33661 LIN physical layer2.
1. If the LIN_PHYS_LAYER_MC33399 define is uncommented, the LIN_PHYS_LAYER_MC33661 define has to be commented.
2. If the LIN_PHYS_LAYER_MC33661 define is uncommented, the LIN_PHYS_LAYER_MC33399 define has to be commented.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
35
Software Description
6.4
6.4.1
LIN Master Software Description
Application Software Main Code
The LIN Master software enables control of the MM908E624 board LIN Slave by the LIN bus via
intelligent GUIs running in the FreeMASTER tool (see Section 2.2, “System Features”). The LIN Master
software flow chart is depicted in Figure 19.
The LIN Master issues standard communication LIN frames in a predefined time schedule, which equals
50ms between two following frame transmissions. If it is necessary, the time scheduling can be modified
in the LIN Master software. The LIN frames identifier and data field contents depend on the required LIN
Slave service (see Appendix A, “Messaging Strategy”). Otherwise, the LIN Master is also capable of
configuring the LIN Slave Window Lift application strategic parameters via the LIN Master Request frame
(0x3C) and uploading the parameter data back to the LIN Master via the LIN Slave Response frame
(0x3D). Both actions are controlled via GUI (see Section 2.2.2, “GUI “Window Lift Parameters
Configuration” Introduction” and Section 7.2.2, “GUI “Window Lift Parameters Configuration”
Description”).
The LIN Master software enables control of the LIN bus communication data flow and the current LIN
nodes status. It allows the user to Run and Stop LIN frames issue, Sleep and Wake-up the LIN bus.
The LIN bus can be woken-up either by the LIN Slave or by the LIN Master. When the LIN Slave has
woken-up the LIN bus, the LIN Master node is switched from the LIN Sleep to LIN Run state and it starts
issuing LIN frames. When the LIN bus frames issue is stopped, the status of the LIN bus becomes Idle. If
the LIN bus state is Idle for more than 2.6 seconds1, the LIN nodes should automatically enter the low
power Sleep mode. The LIN Master software includes a LIN bus no activity counter to enable recognition,
that the LIN nodes have entered Sleep mode. This provides the user with information on current LIN Slave
nodes status.
To check whether the LIN nodes correctly respond to a LIN Master request, basic LIN error handling was
added to the application software. The errors evaluation is based on reading the LIN error flags, that are
periodically updated by LIN 1.3 driver software. The application software evaluates the transmit error,
which reflects if either more than one node is currently transmitting or the LIN bus signal wire is connected
to the power supply wire, and the receive error, which informs the user that the currently processed LIN
node communication failed.
1. The LIN1.3 Protocol Specification (see Reference [6.]) assigns the LIN bus Idle timeout as 25000 of Tbit time. An application
LIN communication runs at 9.6KBd, i.e. Tbit = 1/ fBR = 1 / 9600 = 104us. The LIN bus timeout Tout = 25000 * 104us = 2.6sec.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
36
Freescale Semiconductor
Software Description
Figure 19. LIN Master Software Flow Chart
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
37
User Interface Description
7
User Interface Description
7.1
Introduction
The Graphical User Interface (GUI) was created to allow the user easy application control. There are
several GUIs to introduce the MM908E624 board as a Window Lift controller and a General Purpose
Output PWM duty cycle and voltage polarity controller. The GUIs are described in the following sections:
• Section 2.2.1, “GUI “Window Lift Application Controlled by the LIN Bus” Introduction”
• Section 2.2.2, “GUI “Window Lift Parameters Configuration” Introduction”
• Section 2.2.3, “GUI “The MM908E624 Board OUTs Controlled by the LIN Bus” Introduction”
GUIs run in the FreeMASTER tool (see Section 3.1, “FreeMASTER Tool”)
7.2
7.2.1
GUIs General Description
GUI “Window Lift Application Controlled by the LIN Bus”
Description
This GUI (see Figure 20) offers the user to control the MM908E624 board as the Car Door Window Lift
application.
Figure 20. GUI “Window Lift Application Controlled by the LIN Bus”
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
User Interface Description
The system features are as follows:
• LIN Control (GUI orange background):
— combo box “Select Slave”: Roll down and select by clicking on the desired combo box item,
which LIN Slave device has to be controlled (Right or Left Window Lift Slave).
— note “Status”: It displays the current LIN bus Status (Run / Idle / Sleep).
•
— note “Error”: It displays the current LIN bus communication errors (None Error / None
Response -> LIN Slave not responding on issued frame header / Transmitter Issue -> the LIN
bus signal wire is corrupted or more than one device is issuing LIN frames at the same time.).
— button “Run / Stop”: Run or Stop LIN frames issue by a single click on the push button. The
button displays the next possible change of the current LIN bus Status.
— button “Wake / Sleep”: Wake-up or Sleep the LIN bus by a single click on the push button.
The button displays the next possible change of the current LIN bus Status.
Window Control (GUI blue background):
— combo box “Select Mode”: Select “Normal” or “Keep Window Speed” MM908E624 board
mode by rolling down and clicking on the desired combo box item. During the “Keep
Window Speed” mode, the window glass movement speed is kept independent of the system
power supply voltage variation (The Car Door Window Lift platform has to be adapted to run
the Keep Window Speed mode, i.e. the Window Lift platform DC motor has to offer enough
of a wide margin of PWM duty cycle control with an adequate window glass movement
capability to run the window glass speed control.
— check box “Slave Keyboard Window Control Enable”: Check the box, if window position
control by the MM908E624 board push button keyboard (Open Window / Close Window /
Stop Window)1 is needed.
— check box “Window Soft Start / Soft Stop Enable”: Check the box if the window Soft Start
or Soft Stop feature is required (done by Car Door Window Lift DC motor PWM ramp
control).
— box “Window Desired Position”: Here, enter the Window Glass desired position and then
click on the push button “Go”.
— button “Go”: By clicking on the button, the window glass is going to move to the position
specified in the box situated above the button.
— buttons “Close” and “Open”: By clicking on the button, the window opens or closes. The
button displays the next window action (Stop moving the window) initialized by the next
single click.
— buttons “Close Cmp” and “Open Cmp”: By clicking on the button, the window glass is
going to close or open completely.
— button “Reset Window Stop Reports”: If an “An Antipinch Occurred” or “None Signal on
Hall Port” occurs, by clicking on the button, the MM908E624 board report is cleared and the
board is prepared for the another command execution.
1. If the window is controlled by the MM908E624 on-board keyboard, then the GUI window control is disabled. To enable GUI
window control, uncheck the checkbox “Slave Keyboard Window Control Enable“.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
39
User Interface Description
— box “Last Window Master Command”: This box displays the currently transmitted LIN
Master command (Stop Window / Open Window / Close window / Open Window Completely
/ Close Window Completely / Window To Preset Position).
— box “Current Window Slave Status”: This box displays the current LIN Slave status
(Window Stopped / Closing Window / Opening Window / Window Closed / Window Opened
/ Desired Window Position Reached).
— box “Slave Keyboard Window Control”: This box displays the MM908E624 board push
button keyboard state. If the check box “Control Window by Slave keyboard” is checked, the
keyboard controls the window position (Open Window / Close Window / Stop Window).
— box “Actual Window Position”: It displays the current window glass position.
— box “Hall Pulse Half Period”: It displays the current Hall pulse half period in milliseconds.
This can be used for the MM908E624 board “Keep Window Speed” mode demonstration,
because of the Hall pulse period independence of the power supply voltage variety.
— box “LIN Slave Device Power Supply Voltage”: It displays the current MM908E624 board
power supply voltage in volts. The measurable supply voltage range is from 8 to 15V.
— dot box “An Antipinch Occurred”: It displays, whether a window glass antipinch occurred
(the window glass reached an obstacle).
— dot box “None Signal on Hall Port“: It displays, whether the Hall signals are present on the
MM908E624 board in the correct order.
— The MM908E924 Device Reports: It displays current MM908E624 analog die error reports.
7.2.2
GUI “Window Lift Parameters Configuration” Description
This GUI (see Figure 21) is closely linked to that previously described in Section 2.2.1, “GUI “Window
Lift Application Controlled by the LIN Bus” Introduction”. It enables configuring the strategic parameters
of the Car Door Window Lift application and so allows the user to easily rebuild an application for another
Car Door Window Lift platform with similar features as the one used.
Figure 21. GUI “Window Lift Parameters Configuration”
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
User Interface Description
The GUI offers the following features:
• LIN Control (GUI orange background):
— combo box “Select Slave”: Select by rolling down and clicking on the desired combo box
item, which LIN Slave device to control (Right or Left Window Lift Slave).
— note “Status”: It displays the current LIN bus Status (Run / Idle / Sleep).
— note “Error”: It displays the current LIN bus communication errors (None Error / None
Response -> LIN Slave not responding on Issued frame header / Transmitter Issue -> the LIN
bus signal wire is corrupted or more than one device is issuing LIN frames at the same time.).
— button “Run / Stop”: Run or Stop LIN frames issue by a single click on the push button. The
button displays the next possible change of the current LIN bus Status.
— button “Wake / Sleep”: Wake-up or Sleep the LIN bus by a single click on the push button.
The button displays the next possible change of the current LIN bus Status.
• Window Lift Parameters Configuration (GUI red background):
— button “Upload Parameters”: By clicking on this button, the LIN Master issues the LIN
Master Request command (ID 0x3C) request with the requirement of the Window Lift
parameters structure upload of the LIN Slave node selected by “Select Slave” combo box. The
LIN Slave sends the data on the Slave Response frame (ID 0x3D) header issue.
— button “Assign Max Position”: The Window Lift parameter structure maximal position is
loaded with the actual window glass position counter value (done by 0x3C command). Then
the parameter structure is uploaded to update the LIN Master with new parameter structure
data (done by 0x3D command). This is helpful, if necessary to assign a new window maximal
position (position of closed window)/
— button “Assign An Antipinch Thr”: The Window Lift antipinch threshold assignment. The
assigned value is defined in box “An Antipinch Threshold Desired” (done by 0x3C
command). After the 0x3C command is processed, the parameter structure is uploaded to
update the LIN Master with new structure data (done by 0x3D command)/
— button “Reset Window Pos Ctr”: Clicking on the button causes the window glass position
counter reset (done by 0x3C command). Then the LIN Master is updated with new Window
Lift parameter structure data(done by 0x3D command)/
— button “Store Parameters to MM908E624 Flash Memory”: Clicking on this button causes
storage of the Window Lift parameter structure to MM908E624 MCU Flash memory to
prevent structure data loss.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
41
User Interface Description
7.2.3
GUI “The MM908E624 OUTs Controlled by the LIN Bus”
Description
This GUI (see Figure 22) introduces the MM908E624 board as a general purpose output voltage polarity
and PWM duty cycle controller.
Figure 22. GUI “The MM908E624 Board OUTs Controlled by the LIN Bus”
Offered features are as follows:
• LIN Control (GUI orange background):
— combo box “Select Slave”: Select by rolling down and clicking on the desired combo box
item, which LIN Slave device to control (Right or Left Window Lift Slave).
— note “Status”: It displays current LIN bus Status (Run / Idle / Sleep).
— note “Error”: It displays current LIN bus communication errors (None Error / None
Response -> LIN Slave not responding on Issued frame header / Transmitter Issue -> the LIN
bus signal wire is corrupted, or more than one device is issuing LIN frames at the same time.)
— button “Run / Stop”: Run or Stop LIN frames issue by a single click on the push button. The
button displays the next possible change of the current LIN bus Status.
— button “Wake / Sleep”: Wake-up or Sleep LIN bus by a single click on the push button. The
button displays the next possible change of the current LIN bus Status.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
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Freescale Semiconductor
User Interface Description
•
The MM908E624 Board OUTs Control (GUI blue background):
— button “Confirm the MM908E624 OUTs Control Mode”: By clicking on this button, the
MM908E624 board is configured to be a general purpose OUTs controller.
— button “OUT1 ON” and “OUT2 ON”: By these buttons, the MM908E624 board OUTs state is
controlled. The buttons display the next possible change of the OUTs state.
— OUTs PWM Duty Cycle: By the slide bar control or the box number entry (0 - 255), it is
possible to change the OUTs PWM duty cycle. The board initial OUTs PWM duty equals 120,
and the step equals 1 (duty cycle step approximately equals 0.4%).
— box “Power Supply Voltage”: It displays current MM908E624 board power supply voltage
in volts. The measurable supply voltage range is from 8 to 15V.
— The MM908E624 Device Reports: It displays the current MM908E624 analog die error
reports.
— check box “Control OUTs by Slave keyboard ?”: Check the box if it is needed to control
the MM908E624 board OUTs state by on-board keyboard1.
1. If MM908E624 board OUTs are controlled by the MM908E624 on-board keyboard, then the GUI OUTs control is disabled. To
enable GUI OUTs control, uncheck the checkbox “Control OUTs by Slave keyboard ?“.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
43
Conclusion
8
Conclusion
This AN covers the MM908E624 implementation in the Window Lift / Sun Roof application. The primary
goal of this application is to show the performance and capabilities of the MM908E624 single package
solution. The other goal is to introduce the MC9S12C32 MCU as a LIN Master device and demonstrate
the LIN 1.3 connectivity, that in this case is implemented in the node using the Freescale LIN 1.3 drivers
(see Reference [11.]).
The complete application software for the LIN Window Lift Master (MC9S12C32) and LIN Window Lift
Slave (MM908E624) is downloadable as an AN3147SW package.
The MM908E624 MCU (908EY16) memory consumption is calculated in Table 1.
Table 1. Particular MM908E624 Code Sizes
MCU
Memory Type
MCU
Memory Size
LIN1.3 Software
Occupies
Application
Software Occupies
Totally
Occupied Area
Free
Space
Free
Space
Flash
15872 bytes
1012 bytes
3290 bytes
4302 bytes
11570bytes
73%
RAM
512 bytes
57 bytes
68 bytes
125 bytes
387 bytes
75%
The application uses these MM908E624 MCU (908EY16) peripherals:
• 1-of-8 A/D converter channels
• TIMA and TIMB timers
• TBM module
• IGC module
• ESCI module
• SPI module
The rest of the MM908E624 stuff is free and can be utilized by the user for additional application purposes
(see MM908E624 block diagram on Figure 4).
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
44
Freescale Semiconductor
References
9
References
1. MM908E624: MM908E624 Integrated Triple High-Side Switch with Embedded MCU and LIN
Serial Communication for Relay Drivers, Revision 5.0, 01/2005, Freescale Semiconductor
datasheet
2. MC68HC908EY16/D: MC68HC908EY16 Advance Information, Revision 7.0, 5/2004,
Freescale Semiconductor datasheet
3. MC9S12C32: Product > Microcontrollers > 16bit > HCS12 > MC9S12C32 16bit Microcontroller
product summary page, Freescale Semiconductor Web Page, http://freescale.com
4. MC33399: MC33399 Automotive LIN Physical Interface, Revision 4.0, 2/2005,
Freescale Semiconductor datasheet
5. MC33661: MC33661 Local Area Network (LIN) Enhanced Physical Interface with Selectable
Slew Rate, Revision 4.0, 2/2005, Freescale Semiconductor datasheet
6. LIN Specification Package, Revision 1.3, 12th December 2002, LIN consortium,
http://www.lin-subbus.org/
7. FreeMASTER Product Summary Page: Product > Digital Signal Processors & Controllers > DSP
Development Tools > Software Tools > FreeMASTER, Freescale Semiconductor Web Page,
http://freescale.com
8. AN2573/D: LINkits Evaluation Boards, Revision 1.0, 11/2003,
Freescale Semiconductor datasheet
9. IDC Product Summary Page: Product > Analog > Connectivity Solution > Embedded MCU +
Power, Freescale Semiconductor Web Page, http://freescale.com
10. General Freescale LIN web page: , http://freescale.com/LIN, Freescale Semiconductor Web Page
11. Freescale LIN 1.3 Driver page:, http://freescale.com/LIN, Design Tools > LIN1.x Design Tools >
Software > Device Drivers, Freescale Semiconductor Web Page
12. EB195/B: How to Configure the Reset Pin on the MC68HC11, Freescale Semiconductor
Engineering Bulletin, 1999
13. LIN Specification Package, Revision 2.0, 23rd September 2003, LIN consortium,
http://www.lin-subbus.org/
14. AN2767: LIN 2.0 connectivity on Freescale 8/16bit MCUs using Volcano LTP,
Freescale Semiconductor datasheet
15. LIN 2.0 Driver page: , http://freescale.com/LIN, Design Tools > LIN2.0 Design Tools, Freescale
Semiconductor Web Page
16. MSE908EY16_1L38H: MC68HC908EY16 Mask Set Errata for Mask 1L38H, Revision 1.0,
5/2005, Freescale Semiconductor Errata
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
45
Acronyms
10
Acronyms
ADC
Analog to Digital Converter module
AN
Application Note
API
Application Program Interface
CAN
Controller Area Network
COP
Computer Operating Properly module
CW
CodeWarrior
eLIN
Enhanced LIN
ESCI
Enhanced Serial Communication Interface module
EVB
Evaluation Board
GND
Power Supply Ground Terminal
IC
Integrated Circuit
ICG
Internal Clock Generator module
IDC
Intelligent Distributed Control
I/O
Input / Output ports
LED
Light Emitting Diode
LIN
Local Interconnect Network
LINkit
EVB for LIN development
Master
The LIN Master node controls the LIN connectivity
MCU
MicroController Unit
MW
MetroWerks
OUTs
MM908E624 board relay outputs OUT1, OUT2
PC
Personal Computer
SIO
LIN Serial Input Output Signal Wire
Slave
The LIN Master controls the LIN Slave node task
TBM
TimeBase Module
VSUP
Power Supply Voltage
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
46
Freescale Semiconductor
Freescale Semiconductor
Appendix A
Messaging Strategy
Node Name
for Signal
Provider
ID [0..5]
LIN ID
Field
(w/parity)
Frame Name
Frame
Description
Frame
Size
Bytes)
<published_by>
<frame_id>
(0 to 63)
—
<frame_
name>
—
<frame_
size>
0x0A
0x1A)
0xCA
(0x1A)
WL_L_CMD
(WL_R_CMD)
WL_MASTER
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
WL_LEFT_SLAVE
(WL_RIGHT_SLAVE)
0x0B
(0x1B)
0x8B
(0x5B)
WL_L_STAT
(WL_R_STAT)
Window Lift
Left (Right)
Command
Window Lift
Left (Right)
Status
4
3
Sig
#
Signal Name
Signal
Description
Signal
Length
(bits)
Signal
Start
Bit
Signal
Initial
Value
<signal_
name>
—
<signal_
size>
<signal_
offset>
<init_
value>
wCmd
Window
Command
4
0
0
1
outPwmCtrEnb
OUTs PWM
Duty Cycle
Control
1
4
0
2
boardMode
MM908E624
Board Mode
2
5
0
3
pwmDes
8
8
0
4
windowPosDes
MM908E624 Board
OUTs Desired
PWM Duty Cycle
Window Desired
Position
16
16
0
0
wStat
Current Window
Status
4
0
0
1
wAntipinch
Window Antipinch
1
4
0
2
wSReq
2
5
0
3
acE624Stat
LIN Slave Keyboard
Window Action
Request
MM908E624
Analog Die Status
5
8
0
4
hallErr
Hall Port Error
1
13
0
5
powerSupVolt
MM908E624 Board
Power Supply
Voltage
8
16
0
—
0 – WINDOW STOP
1 – WINDOW CLOSE
2 – WINDOW OPEN
5 – WINDOW CLOSE COMPLETELY
6 – WINDOW OPEN COMPLETELY
8 – WINDOW GO TO DESIRED POSITION
0 – PWM CONTROL DISABLED
1 – PWM CONTROL ENABLED
(During Keep Window Speed and PWM Control mode, PWM_CTR
bit has to be set, otherwise the MM908E624 board is not working
properly.)
1 – NORMAL MODE
2 – KEEP WINDOW SPEED MODE
(Set PWM_CTR bit also)
3 – PWM CONTROL MODE
(Set PWM_CTR bit also)
MM908E624 board OUTs PWM CUTY CYCLE (0–255)
(LIN Slave evaluates this signal during PWM Control
mode only)
WINDOW POSITION DESIRED (0–65535)
(LIN Slave evaluates this signal during Normal and Keep Window
Speed modes)
0 – WINDOW STOPPED
1 – WINDOW CLOSING
2 – WINDOW OPENING
5 – WINDOW CLOSED COMPLETELY
6 – WINDOW OPENED COMPLETELY
8 – WINDOW REACHED DESIRED POSITION
0 – NOT OCCURRED
1 – OCCURRED
If an antipinch occurred, LIN Master has to send Window Stop
Command to clear LIN Slave antipinch flag.
1 – WINDOW CLOSE
2 – WINDOW OPEN
3 – WINDOW STOP
MM908E624 ANALOG DIE REGISTER D2–D6 BITS COPY IN BIT
ORDER FROM LSB TO MSB AS FOLLOWS:
– HSST (High-Side over-temperature)
– VDDT (Voltage Regulator over-temperature)
– LVF (Power supply low voltage)
– HVF (Power supply high voltage)
– LINFAIL (LIN layer overcurrent / overvoltage)
0 – NOT OCCURRED
1 – OCCURRED
If a Hall error occurred, LIN Master has to send Window Stop
Command to clear LIN Slave Hall error flag.
powerSupVolt (0–255) * 0.1 = MM908E624 board power supply
voltage [V}
47
Messaging Strategy
0
Raw Value Range
ID [0..5]
LIN ID
Field
(w/parity)
Frame Name
Frame
Description
Frame
Size
Bytes)
<published_by>
<frame_id>
(0 to 63)
—
<frame_
name>
—
<frame_
size>
WL_LEFT_SLAVE
(WL_RIGHT_SLAVE)
0x0C
(0x1C)
0x4C
(0x9C)
WL_L_INFO
(WL_R_INFO)
WL_MASTER
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
WL-LEFT_SLAVE
(WL_RIGHT_SLAVE)
0x3C
0x3D
0x3C
0x7D
MasterReq
SlaveResp
Window Lift
Left (Right)
Info)
3
LIN Master
Request
Command
8
LIN Slave
Response
Command
8
Sig
#
Signal Name
Signal
Description
Signal
Length
(bits)
Signal
Start
Bit
Signal
Initial
Value
Raw Value Range
<signal_
name>
—
<signal_
size>
<signal_
offset>
<init_
value>
—
Window Position
Actual
Hall Pulse Signal
Period
Requred LIN
Slave Action
16
0
0
ACTUAL WINDOW POSITION (0–65535)
8
16
0
hallPulseWidth (0–255) * 0.1 = hall pulse period [ms]
8
0
0
0x00 – SLEEP COMMAND
0x80 – ASSIGN MAXIMAL POSITION
(Copy Window Actual Position counter value to Window
Maximal Position variable)
0x81 – ASSIGN NEW WINDOW ANTIPINCH THRESHOLD
(Tick Difference Threshold value)
0x82 – RESET WINDOW ACTUAL POSITION COUNTER
0x83 – STORE PARAMEERS TO LIN SLAVE FLASH MEMORY
0x84 – DOWNLOAD PARAMETERS FROM LIN SLAVE
TO LIN MASTER
0 – WINDOW LIFT LEFT LIN SLAVE
1 – WINDOW LIFT RIGHT LIN SLAVE
NEW WINDOW ANTIPINCH THRESHOLD (0–65535)
0
windowPosAct
1
hallPulseWidth
0
slaveCfgCmd
2
linSelectSlave
Select LIN Slave
8
8
0
3
tickDifThrDes
16
16
0
0
slaveCfgCmdLast
New value of Tick
Difference
Threshold
Last Required LIN
Slave Action
8
0
0
1
tickDifThrAct
16
8
0
2
posMax
16
24
0
3
windowPosAct
16
40
0
4
captureEdge
Tick Difference
Threshold
Window Maximal
Position
Window Actual
Position
Last Capturred Hall
Sensor Edge
2
56
0
0x00 – SLEEP COMMAND
0x80 – ASSIGN MAXIMAL POSITION
(Copy Window Actual Position counter value to Window
Maximal Position variable)
0x81 – ASSIGN NEW WINDOW ANTIPINCH THRESHOLD
(Tick Difference Threshold value)
0x82 – RESET WINDOW ACTUAL POSITION COUNTER
0x83 – STORE PARAMEERS TO LIN SLAVE FLASH MEMORY
0x84 – DOWNLOAD PARAMETERS FROM LIN SLAVE
TO LIN MASTER
CURRENT WINDOW ANTIPINCH THRESHOLD(0–65535)
MAXIMAL WINDOW POSITION (Position, where the Window
is closed completely) (0–65535)
ACTUAL WINDOW POSITION (0–65535)
MM908E624 board Hall port (pin 2) Hall Sensor 1 signal
LAST CAPTURED EDGE:
1 – RISING
2 – FALLING
Messaging Strategy
48
Node Name
for Signal
Provider
Freescale Semiconductor
System Setup
Appendix B
System Setup
B.1
General Overview
The system can be run in two different system setups. The first system setup introduces an application as
the MM908E624 board OUTs high current controller. This setup is recommended for running the system
as the Window Lift application, because of the Window Lift platform high current requirement (typically
up to 15A). The second system set up shows an MM908E624 board OUTs low current control (typical up
to 300mA). It’s suitable for the MM908E624 OUTs voltage polarity and PWM duty cycle control
demonstration.
NOTE
Section B.2, “System Hardware Setup” introduces several possible
hardware configurations. Please, follow one of those system setups and
avoid connecting a power supply source to both boards (908E624 board and
MC9S12C32 LINkit) at once. It can cause damage of used stuff.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
49
System Setup
B.2
B.2.1
System Hardware Setup
“High Current” System Setup
The system setup for the high current OUTs control is depicted in Figure 23. The system is supplied from
the MM908E624 board J1 connector to enable running the high current board loads as the Window Lift
and Run Roof. The system parameters:
• Nominal power supply voltage: 12V (range from 8 to 18V)
• Power supply current capability: It depends on the controlled load parameters. For the
MM908E624 board Window Lift control it is recommended to use a power supply with up to 20A
current sourcing capability.
NOTE
It is necessary to keep a correct power supply voltage polarity, otherwise the
MM908E624 condenser C1 (reservoir of energy for the Window Lift DC
motor currents peak management) explodes (see schematic in Figure 8) and
the 908E624 board, including the MC9S12C32 LINkit, can also be
damaged.
FreeMASTER Tool
PC Parallel
Port Cable
Window Lift
Connection
BDM Multilink
MM908E624
Board Hall
Sensor Input
MM908E624
Board OUTs
Control GUI
Power Supply
Personal
Computer
(PC)
LIN Bus
MC9S12C32 LINkit Board (LIN Master)
MM908E624 Board (LIN Slave)
Figure 23. “High Current” System Setup
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
50
Freescale Semiconductor
System Setup
B.2.2
“Low Current” System Setup
To enable running the system without any “huge” power supply source, the “Low Current” system setup
was created (depicted in Figure 24). The system is supplied from an external source via MC9S12C32
LINkit power supply connector PW1 (see schematic in Figure 11). This system setup mostly corresponds
to the reality, where the LIN nodes are supplied from the LIN Master device. However, because of the
MC9S12C32 LINkit board low current power supply capability, limited by board 500mA F1 fuse, the
maximal MM908E624 board OUTs current must not exceed a maximal limit of 300mA. The remaining
current capability of 200mA is resolved for the MC9S12C32 LINkit board stuff and also the BDM
multilink device power supply. The nominal power supply voltage equals 12V, however, it can float in
range from 8V to 18V.
PC Parallel
Port Cable
FreeMASTER Tool
BDM Multilink
Power Supply
Load
Connection
MM908E624
Board Hall
Sensor Input
Control GUI
MM908E624
Board OUTs
Personal
Computer
(PC)
LIN Bus
MC9S12C32 LINkit Board (LIN Master)
MM908E624 Board (LIN Slave)
Figure 24. “Low Current” System Setup
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
51
System Setup
B.2.3
MM908E624 Board Jumper Setting
The MM908E624 board includes jumper JP1, which controls the MM908E624 analog die Window
Watchdog (see Section 4.1, “MM908E624 Integrated Triple High-Side Switch with Embedded MCU and
LIN Serial Communication for Relay Drivers”). If the JP1 board jumper is opened, the analog die Window
Watchdog is enabled.
The MM908E624 application software does not includes the routine for the MM908E624 analog die
Window Watchdog service, therefore as Figure 7 shows, the JP1 has to be always closed.
B.2.4
MM908E624 Board Window Lift Platform Connection
The MM908E624 board connectors interface is depicted in Figure 9. It is necessary to connect the Hall
sensors to the MM908E624 board in the correct order, depending on the required window glass action, as
Figure 25 and Figure 26 show. Notice, that the Hall Sensor signal period is not only dependent on the
actual window glass position, but also on the window glass movement direction. If the window glass is
opening, the Hall Sensor signal pulse period is lower than during the window close execution. This is
caused by gravitation, as the window glass is attracted to the earth.
Hall Sensor 1
Resolution:
5V / d
5ms / d
Hall Sensor 2
Figure 25. Hall Port Signals Order During Window Closing
Hall Sensor 1
Resolution:
5V / d
5ms / d
Hall Sensor 2
Figure 26. Hall Port Signals Order During Window Opening
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
52
Freescale Semiconductor
System Setup
B.3
System Software Setup
B.3.1
MM908E624 Board Software
The MM908E624 software is written mainly in C language, except some routines which are written in
HC08 assembler. The MM908E624 board code is generated using Metrowerks CodeWarrior for HC(S)08
devices compiler, version 3.1. The code is downloaded to the MM908E624 device by the board J3 standard
16-pin MON08 multilink connector header (see MM908E624 board description in Figure 7).
B.3.2
MC9S12C32 LINkit Board Software
The MC9S12C32 software is mainly written in C language, except some routines which are written in
HC12 assembler. The MC9S12C32 board code is generated using Metrowerks CodeWarrior for HC(S)12
devices compiler, version 3.1. The code is downloaded to the MC9S12C32 device by the LINkit board H1
standard 6-pin BDM multilink connector header (see MM908E624 board description in Figure 10).
B.3.3
FreeMASTER Tool
The FreeMASTER tool has to be installed on a PC together with the BDM plug-in, which creates the data
line between the PC and MC9S12C32 LINkit board. The FreeMASTER tool can be downloaded from the
Freescale FreeMASTER web pages Reference [7.]. To obtain the BDM plug-in, see advanced information
on the Freescale FreeMASTER web pages.
B.4
Application Executing
When the application hardware and software setup is complete, connect the power supply voltage and run
the FreeMASTER tool by double clicking on the Project.pmp file. If the FreeMASTER is running, go to
the tool bar (see Figure 27), select Project -> Options and check if the “Comm” and “MAP Files” folders
setup is correct (see Figure 28 and Figure 29). If the folder setup is not correct, correct it and then click on
“Save Project” to save the new project setting. For a proper application run, the “Stop Communication”
button should not be pushed, as Figure 27 shows.
Save Project
Stop Communication
Figure 27. FreeMASTER Tool Bar
If the communication between the FreeMASTER and MC9S12C32 is not running yet, try to disconnect
and then again connect the BDM multilink connector to the LINkit board. Then close the FreeMASTER
tool and re-open it.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
53
System Setup
Figure 28. FreeMASTER “Comm” Folder Setup
Figure 29. . FreeMASTER “MAP Files” Folder Setup
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
54
Freescale Semiconductor
System Setup
If the MM908E624 boards OUTs current is too high and the transition behavior of the power supply source
is so slow, the drop in the power supply source voltage may cause the MC9S12C32 LINkit reset. To avoid
this, connect between the MM908E624 board and MC9S12C32 LINkit board LIN power supply inputs
diode and increase the LINkit board decoupling capacitor C1 (see schematic in Figure 11) value up to
220uF/35V (Figure 30).
LIN Bus
GND
SIO
VSUP
+
220uF / 35V
Diode e.g.
1N4007
Figure 30. MC9S12C32 LINkit Board Bottom View
If it is necessary to measure the MM908E624 supply current, e.g. in device Sleep mode, disconnect the
diode D1 (see schematic in Figure 8) from the MM908E624 board and use these free pads for the current
measurement device connection1 (see Figure 31).
A
Diode D1
Current
Flow
Figure 31. MM908E624 Board Bottom View
1. Be aware, that the MM908E624 is not protected against incorrect power supply voltage polarity now. Don’t push the
MM908E624 board keyboard (S1, S2), otherwise the measured power supply current value will not be correct.
MM908E624 Window Lift / Sun Roof LIN Slave, Rev. 0.2
Freescale Semiconductor
55
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AN3147
Rev. 0.2, 11/2005
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