AN2503 Freescale Semiconductor / Motorola, AN2503 Datasheet - Page 27

• Manufacturer Part Number: AN2503
• Description: Slave LIN Driver for the MC68HC908QT/QY Family
• Manufacturer: Freescale Semiconductor / Motorola

MC33399
Description
Voltage Regulator
Headers, Jumpers,
and Connectors
MOTOROLA
WAKE
V
GND
INH
Pin
LIN
EN
Rx
Tx
SUP
Another important component in the board is the MC33399, the LIN
transceiver. This transceiver is a physical layer component dedicated to
automotive sub-bus applications. It is compliant with LIN specifications, sleep
mode, and wake up capability. The transceiver can wake up from sleep mode
with three different events:
The last two events will be used in this board. The pin description for this
transceiver can be found in
This board also includes a voltage regulator with shutdown capability which
supplies all the circuitry, excluding the LIN transceiver. This will enable the
transceiver to wake all the components when LIN bus activity is detected.
This board allows for direct connectivity with a LIN bus, at the same time
allowing programming and debugging capabilities. This is accomplished by the
jumpers described in
Slave LIN Driver for the MC68HC908QT/QY Family
•
•
•
Freescale Semiconductor, Inc.
Transceiver enable
For More Information On This Product,
Wake-up signal from the wake pin
Active signal in EN pin
LIN bus activity
LIN reception
LIN reception
Power supply
Description
Wake input
LIN bus
Ground
Inhibit
Go to: www.freescale.com
Table 9. MC33399 Pin Usage
Table
Reports the state of the LIN bus
Controls the operation mode
MCU interface that controls the
Provides ground (V
The single-wire bus transmitter
Provides power supply (7 to 27 V).
Used in this board to control an
High-voltage input used to wake
voltage.
(active or sleep).
the device from sleep mode.
state of the LIN output.
and receiver.
external switchable voltage
regulator. Can be negated and
used as an external interrupt to
wake the MCU.
Table
10.
9.
Use
SS
).
Hardware Implementation
Pin 4 of connector
MC68HC908QY4
MC68HC908QY4
MC68HC908QY4
SHDN pin in
Connection
LIN MOLEX
regulator
PTB7 in
PTB2 in
PTA1 in
V
GND
GND
SUP
AN2503/D
27