SIG40 Datasheet, PDF (2/12 Pages) Yamar Electronics Ltd. – for DC-LIN Asynchronous Communication Over Noisy Lines

Proprietary and Confidential Information of YAMAR Electronics Ltd.
2 OVERVIEW
2.1 Signaling System
The SIG40 device is based on a patented Signaling technology. The device transmits and receives a
special signaling carrier, which can be differentiated from noise. The receiver receives the signaling
patterns, extracting them into the original bits. The rest of the spectrum is reserved for additional
communication channels over the same DC noisy lines.
2.2 Channels and Network
The SIG40 operates over one of two preset selectable channels (frequencies) using a single line such
as the vehicle's battery power line. Up to 16 devices can be connected to each of the channels over the
same line. Each of them can broadcast asynchronous data messages to other devices on the bus
according to the LIN protocol. The device is controlled by its host microprocessor through its UART.
Channel frequencies: 3.58MHz to 6.5MHz
Data transfer rate:
19.2Kbps to 57.6Kbps.
Cable length:
See 3.3.9.
2.3 The SIG40 Device
The SIG40 device is responsible to transfer messages to all devices over the line. The device handles
the communication physical layer and Interference detection. The device communicates with its host via
an asynchronous serial port for data transfer and device control. Figure 2.1 outlines the building blocks
of the SIG40 device.
H o s t In te rfac e
T im in g
& Synch
P LL
S le e p
C o ntro l
32K
O s c illa to r
S IG 4 0
P rotoco l
H a n d le r
P ro to c o l
C o n tro lle r
In te rfe re n ce
D e te c to r
H o st I/F
S ig n a lin g
G e n e ra to r a n d
D etector
M odem
T o / F ro m L in e in te rfa c e
Figure 2.1 - SIG40 logical blocks
2.4 Protocol
The LIN protocol is based on a master device communicating with up to 15 slaves using half-duplex
UART data. The device is transparent to the LIN host while providing additional services for the link and
application layers with a built-in Interference detector and frequency management.
2.5 Power Management
Sleep Mode, controlled by the host, saves power by disabling most of the circuits.
During Sleep Mode, the device is switched On for a short period to detect wakeup messages from other
devices on the bus. If no activity is detected, the device is switched back to Sleep.
@ 2007 Yamar Electronics Ltd.
2
DS-SIG40 R1.8