aduc7032 Analog Devices, Inc., aduc7032 Datasheet - Page 120

• Manufacturer Part Number: aduc7032
• Description: Microconverter Integrated, Precision Battery Sensor
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
LIN Frame Break Symbol
As shown in Figure 40, the LIN “break” symbol is used to signal
the start of a new frame. It lasts at least 13 bit periods and a
slave must be able to detect a “break” symbol, even if it expects
data or is in the process of receiving data. The ADuC7032
accomplishes this by using the LHSVAL1 Break Condition and
LIN Frame Synchronization Byte
The baud rate of the communication via LIN is calculated from
the SYNC Byte. This can be seen in Figure 41. The time
between the first falling edge of the Sync Field and the fifth
falling edge of the Sync Field is measured. This is then divided
LIN Frame Protected Identifier
After receiving the LIN synch field, the required baud rate for
the UART is calculated. The UART is then configured, which
allows the ADuC7032 to receive the Protected Identifier, as
shown in Figure 42. The Protected Identifier consists of two
sub-fields, the identifier and the identifier parity. The six bit
identifier contains the identifier of the target for the frame. The
START
START
BIT
BIT
T
ID0
T
BIT
BIT
START
BIT
ID1
Figure 42 : LIN Identifier Byte Field
Figure 41 : LIN Synch byte Field
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Figure 40 : LIN Break Field
ID2
T
BREAK
ID3
> 13T
BIT
Break Error detect functionality as described earlier. The
“break” period does not have to be accurately measured, but if a
bus fault condition (bus held low) occurs it must be flagged.
by eight to give the baud rate of the data that will be
transmitted. The ADuC7032 implements the timing of this
Sync byte in hardware. For more information on this feature,
please refer to LIN Hardware Synchronization.
identifier signifies the number of data bytes to be either
received or transmitted. The number of bytes is user
configurable at system level design. The parity is calculated on
the identifier, and is dependent on the revision of LIN the
system is designed for.
ID4
ID5
P0
DELIMIT
BREAK
P1
STOP
STOP
BIT
BIT
ADuC7032