AMIS-30621 Datasheet, PDF (36/43 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30621 LIN Microstepping Motordriver
Data Sheet
9.2.4 LIN Controller
9.2.4.1 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-30621 is compliant
with the LIN rev. 1.2 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.
9.4.2.4 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.
AMI Semiconductor - Rev. 1.4
www.amis.com
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