AMIS-30623 Datasheet, PDF (40/65 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30623
15.0 Lin Controller
15.1 General Description
The LIN (local interconnect network) is a serial communications protocol that efficiently supports the control of mechatronic nodes in
distributed automotive applications. The interface implemented in the AMIS-30623 is compliant with the LIN rev. 1.3 specifications. It
features a slave node, thus allowing for:
• Single-master / multiple-slave communication
• Self synchronization without quartz or ceramics resonator in the slave nodes
• Guaranteed latency times for signal transmission
• Single-wire communication
• Transmission speed of 19.2 kbit/s
• Selectable length of Message Frame: 2, 4, and 8 bytes
• Configuration flexibility
• Data checksum security and error detection;
• Detection of defective nodes in the network.
It includes the analog physical layer and the digital protocol handler. The analog circuitry implements a low side driver with a pull-up
resistor as a transmitter, and a resistive divider with a comparator as a receiver. The specification of the line driver/receiver follows the
ISO 9141 standard with some enhancements regarding the EMI behavior.
V_BB
to
control
block
RxD
LIN
protocol
handler
TxD
LIN address
Filter
Slope
Control
PC20051124.1
from OTP
Figure 25: LIN Interface
LIN
HW0
HW1
HW2
15.2 Slave Operational Range for Proper Self Synchronization
The LIN interface will synchronize properly in the following conditions:
• Vbb ≥ 8 V
• Ground shift between master node and slave node < ±1V
It is highly recommended to use the same type of reverse battery voltage protection diode for the Master and the Slave nodes.
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