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© 2007 Yamar Electronics Ltd.

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DS-ISL40 R1.6

4.1

Application interface

4.1.1

HDO

The HDO pin outputs the data that is being received from the DC-BUS. It can be used to monitor the

incoming data.

4.1.2

SigIn[0:3]

Four input signals to the ISL40. On a Read or Read Change command the pins status is being send

back to the Master in the lower nibble of the returned data byte.

4.1.3

SigO[0:3]

Four output signals from ISL40. The pins state is changed when the Master issues a Write command.

The pins status is defined in the lower nibble of the Write command’s OUT byte.

4.1.4

SigIO[4:7]

Four input or output signals of the ISL40, depending on the nExtendIn pin. When configured as inputs

their status is being send back to the Master in the upper nibble of the return data byte. When they are

configured as outputs their state is defined in the upper nibble of the Write command’s OUT byte.

4.1.5

nExtendIn

Determines if the SigIO[4:7] pins are inputs or outputs. 1= outputs, 0 = inputs.

4.1.6

ID[1:4]

Four ID address input pins. Using the ID address each ISL40 on the network or a specified group of

ISL40 can receive individual commands.

4.2

Sleep control

4.2.1

AutoSleep

When AutoSleep pin is set to High the device will automatically enters sleep mode after about 8

seconds without reception.

4.2.2

nSleep

Sleep control input from external signal. Should be connected to High (Vcc).

4.2.3

Wake

Local wakeup input. Negative or positive edge triggered. This pin can be connected to an external

switch in the application. When the pin is triggered the device will wake up and send a wake up

message to all the devices on the network.

4.2.4

INH

Inhibit output for enabling the host (or an external voltage regulator powering the host. This output is

LOW when in Sleep Mode, and HIGH in normal operation and after a wakeup event.

4.3

Frequency control

4.3.1

AutoFreqCh

When high, the device automatically switches frequency after about 4 seconds without bus activity.