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© 2007 Yamar Electronics Ltd.

2

DS-ISL40 R1.6

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:

up to 57.6Kbps.

Cable length:

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.

M e s s a g e H a n d le r

S ig n a lin g

G e n e r a t o r a n d

D e t e c t o r

I S L 4 0

T x / R x

O u t p u t

I n p u t

M o d e m

C e r a m ic

F ilt e r

T im in g

3 2 . 7 6 8 K

X t a l

O s c il la t o r

L I N

M e s s a g e

H a n d l e r

C e r a m i c

F ilt e r

S le e p

C o n t r o l

I D

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.