AN2573 Freescale Semiconductor / Motorola, AN2573 Datasheet - Page 2

• Manufacturer Part Number: AN2573
• Description: LINkits LIN Evaluation Boards
• Manufacturer: Freescale Semiconductor / Motorola

AN2573/D
LINkits Demonstration Application
2
NOTE:
Slave
GR60
EY16
QY4
QL4
Default ID
round all those present on the bus. The sending of header frames from the
master can also be switched off to demonstrate the slaves’ ability to enter
low-power sleep mode in the absence of LIN activity (not applicable to the QY4
slave).
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.
The master has two modes selected by its slide switch. In one mode, a single
lit LED sweeps up and down the display indicating that no LIN header frames
are being sent. In this mode any slaves connected should be in sleep mode.
With the switch in the other position, the master sends headers for all the IDs
used in the demonstration application and checks to see which are actually
present. If a slave is present, the identification code and data is displayed in
turn for all the IDs for which a response is received. The IDs used are shown in
Table
The master cycles round the IDs of all the slaves that it finds to be present and
displays each slave’s ID using the bottom (leftmost) four LEDs. The two
leftmost LEDs show the slave type, and the next two LEDs show the two LSBs
of its ID using the code shown in
The choice of IDs, their display formats, and the skipping of zero in the data
field ensure that there is at least one 1 in each 4-bit field. These provisions
eliminate the possibility of an all-zero slave display (which would also be
represented in the master display by no illuminated LEDs). The only exception
to this is the ID field displayed by the master for the last configurable QL ID
($10).
$29
$21
$19
$11
Freescale Semiconductor, Inc.
For More Information On This Product,
1.
Table 1. The LIN IDs Used by Each Type of Slave
Configurable IDs
$2A, $2B & $28
$1A, $1B & $18
$22, $23 & $20
$12, $13 & $10
LINkits LIN Evaluation Boards
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1001 (d), 1010, 1011 & 1000
0001 (d), 0010, 0011 & 0000
0101 (d), 0110, 0111 & 0100
1101 (d), 1110, 1111 & 1100
Master LED ID Code
Table
(d: default)
1.
$2C, $2D, $2E & $2F
$1C, $1D, $1E & $1F
$24, $25, $26 & $27
$14, $15, $16 & $17
Alternative IDs
MOTOROLA