AMIS-30621 Datasheet, PDF (34/59 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS−30621
V_BB
to
control
block
30 kW
RxD
LIN
protocol
Filter
LIN
handler
TxD
Slope
Control
LIN address
from OTP
HW0
HW1
HW2
Figure 21. LIN Interface
Slave Operational Range for Proper Self
Synchronization
The LIN interface will synchronize properly in the
following conditions:
• Vbat w 8 V V_BB w 7.3 V
• Ground shift between master node and slave node <
±1 V
It is highly recommended to use the same type of reverse
battery voltage protection diode for the Master and the Slave
nodes.
Functional Description
Analog Part
The transmitter is a low−side driver with a pull−up resistor
and slope control. The receiver mainly consists of a
comparator with a threshold equal to V_BB/2. Figure 5 shows
the characteristics of the transmitted and received signal.
See AC Parameters for timing values.
Protocol Handler
This block implements:
• Bit Synchronization
• Bit Timing
• The MAC Layer
• The LLC Layer
• The Supervisor
Error Status Register
The LIN interface implements a register containing an
error status of the LIN communication. This register is as
follows:
Table 24. LIN ERROR REGISTER
Bit 7
Bit 6
Bit 5
Not used
Not used
Not used
Bit 4
Not used
Bit 3
Time out
error
Bit 2
Data error
Flag
Bit 1
Header error
Flag
Bit 0
Bit error Flag
With:
• Time out error: The message frame is not fully
completed within the maximum length T_{FRAME_MAX}
• Data error flag: Checksum error ⊕ StopBit error ⊕
Length error
• Header error flag:Parity ⊕ SynchField error
• Bit error flag: Difference in bit sent and bit monitored
on the LIN bus
A GetFullStatus frame will reset the error status
register.
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