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AN2633 の電気的特性と機能

AN2633のメーカーはMotorola Semiconductorsです、この部品の機能は「LIN Drivers Application Note」です。


製品の詳細 ( Datasheet PDF )

部品番号 AN2633
部品説明 LIN Drivers Application Note
メーカ Motorola Semiconductors
ロゴ Motorola Semiconductors ロゴ 




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AN2633 Datasheet, AN2633 PDF,ピン配置, 機能
Application Note
AN2633/D
Rev. 1, 3/2004
LIN Drivers for SLIC Module
on the MC68HC908QL4
Freescale Semiconductor, Inc.
By: Matt Ruff
8/16 Bit Systems Engineering
Austin, Texas
Overview
This application note describes three versions of a slave LIN driver developed
for the slave LIN interface controller (SLIC) module on the MC68HC908QL4
(QL4) microcontroller unit (MCU). The slave driver comes with the Motorola
QL4 LIN kit evaluation board, which also contains AN2573/D: LIN Kits LIN
Evaluating Boards, which demonstrates the functionality of the driver.
The slave driver also comes with the M68EVBQL4 evaluation board (EVB)
from Metrowerks, along with a compatible version of the application code for
the EVB. The software for the LIN kit, including this driver, can be downloaded
from the Motorola LIN website: http://motorola.com/semiconductors/LIN
Local Interconnect
Network (LIN)
LIN (local interconnect network) is a low-cost communication protocol often
used in automotive applications that do not require the bandwidth and
versatility of CAN. The LIN bus uses only a single data wire and can
communicate at speeds up to 20 kbps. A LIN network has a single master and
multiple slaves, so bus arbitration is not required.
The driver and application was developed from the LIN Specification Package.
(See References for this and other useful resources.)
NOTE:
With the exception of mask set errata documents, if any other Motorola
document contains information that conflicts with the information in the device
data sheet, the data sheet should be considered to have the most current and
correct data.
Cyclone® and MultiLink® are registered trademarks of P&E Microcomputer Systems, Inc.
This product incorporates SuperFlash® technology licensed from SST.
© Freescale Semiconductor, Inc., 2004. All rights reserved.
For More Information On This Product,
Go to: www.freescale.com
© Motorola, Inc., 2004
Free Datasheet http://www.Datasheet4U.com

1 Page





AN2633 pdf, ピン配列
Freescale Semiconductor, Inc.
AN2633/D
SLIC Module Operation, Features, and Benefits
SLIC Module Operation, Features, and Benefits
The SLIC module on the QL4 represents a level of hardware support for LIN
slave applications that offers unparalleled performance. This increased
performance enables LIN slave node designers to do much more with smaller
devices than possible with UART-based solutions.
True Autobauding
up to 120 kbps with
No Software
Changes
The SLIC module automatically performs two very importantbut distinctly
separatefunctions while establishing communication on the LIN bus:
Autosynchronization
Autobauding
Automatic LIN message frame synchronization (autosynchronization) is the
ability to detect an idle bus and correctly determine when a LIN message frame
header has begun.
In many standard UART solutions, this operation can prove problematic,
because it is possible to erroneously detect a 0x00 data character as a break
symbol, even when within LIN timing specifications. This can happen if the
driver software uses the standard UART break-detection circuitry without
actually measuring the length of the break symbol. (The ESCI on many
Motorola HC08 MCUs contains a feature controlled by a bit called the LINR bit
which prevents this error.)
Autobauding is the ability to derive the LIN bus speed from the synchronization
byte in the header. Autobauding is possible only if the header is synchronized
to the beginning of the message frame. The SLIC handles autobauding and
sets up to transmit or receive the rest of the message frame at this speed.
Then, the SLIC receives the identifier for the message frame and checks the
parity bits to ensure the data integrity of the identifier byte. No software
intervention is required until this point, when the ID is presented to the
application or driver software. The software performs a lookup and then
decides what to do for this message frame.
Because LIN was designed to use inexpensive RC oscillators, the SLIC module
was designed to allow an input clock tolerance of about ±50% and ensure that
the accuracy of LIN communication is ±1% or less. This wide range of clock
accuracy means that in any LIN slave application, it is not necessary to trim the
internal oscillator to establish and maintain LIN communications. (Motorola
internal RC oscillators, such as the one on the HC908QL4 device, typically
come from the factory with a guaranteed tolerance of ±25% before trimming.)
This also means that ROM devices are perfectly suited to be used without any
nonvolatile memory at all, because they would never need to store a trim value.
LIN Drivers for SLIC Module on the MC68HC908QL4
For More Information On This Product,
Go to: www.freescale.com
3
Free Datasheet http://www.Datasheet4U.com


3Pages


AN2633 電子部品, 半導体
AN2633/D
Freescale Semiconductor, Inc.
time spent inside the communications interrupt handlers. This time is valuable
because other interrupts cannot be handled during this time.
Hardware LIN Kit Demo Board
NOTE:
The LIN kit demo board is made from a QL4 with an added LIN interface, which
consists of an MC33399 LIN transceiver and a 5-V regulator (an LT1121 chip).
The board can be programmed using either the RS-232 MON08 interface or a
Cyclone® or MultiLink® tool.
The board requires three jumpers (J2, J4, and J5) for programming it using the
RS-232 MON08 interface. The jumper J2 is however not needed when using a
MultiLink or Cyclone tool to program or debug.
If you plan to use MON08 tools for debugging, you must avoid manipulating pin
PTA0 since that will disturb the communication with the tool.
VBat ~12 V 8 LT1121 1
53
2.2 k
1 k
5V
100 k
47 k
J2
(MONITOR
MODE)
27 k
J4
5 V (DEBUG)
7 IRQ
5
VDD
8
RESET
9.1 V
78
47 k
ZENER
LIN
6 LIN VSup
INH EN 2
13 B7
MC68HC908QL4
MC33399 Rx 1
16 B4 (SLC Rx)
3 WAKE
GND
5
10 k
Tx 4
15 B5 (SLC Tx)
OSCILLATOR MODULE
(DEBUG)
2 OSC1
J5
VSS
4
GND
100 nF
A1 6
100 k
RESET
PUSH-BUTTON
S1
B0
B1
B2
9
12
11
14
B6
1 k1 k1 k1 k
Figure 3. Schematic of QL4 LIN Kit Board
6 LIN Drivers for SLIC Module on the MC68HC908QL4
For More Information On This Product,
Go to: www.freescale.com
Free Datasheet http://www.Datasheet4U.com

6 Page



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