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2.2
Channels and Network
The ISL40 operates over one of two preset selectable channels (frequencies) using a single line such
as the vehicle’s battery power line. A SIG40 master and up to 15 ISL40 slave devices can be connected
to each of the channels over the same line. Each of them can receive a message that controls either 4
output pins and returns a message consisting of its 8 input pins status or control 8 output pins and
return status of its 4 input pins according to the device setup. By selecting other channels, more than
one network may be used over same line for different applications.
Channel frequencies: 3.58MHz to 6.5MHz.
Data transfer rate:
Cable length:
up to 57.6Kbps.
Depends on external loads connected to the DC line.
2.3 The ISL40 Device
Figure 2.1 outlines the building blocks of the ISL40 device.
O u tp u t
In p u t
IS L 4 0
M e s s a g e H a n d le r
ID
T im in g
S ig n a lin g
G e n e ra to r a n d
D e te c to r
3 2 .7 6 8 K
X ta l
O s c illa to r
L IN
M e s s a g e
H a n d le r
C e ra m ic
F ilte r
S le e p
C o n tro l
M o d e m
C e ra m ic
F ilte r
T x /R x
Figure 2.1 - ISL40 Logical Blocks
2.4 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 Signaling activity on the bus.
If no activity is detected, the device is switched off.
© 2007 Yamar Electronics Ltd.
2
DS-ISL40 R1.6
YAMAR [ YAMAR ELECTRONICS LTD. ]
