Data Sheet

6

Rev. 1.0, 2009-05-14

IFX1050G

Operation Modes

4

Operation Modes

Figure 3

Mode State Diagram

The IFX1050G is equipped with three different operation modes.

4.1

Normal Mode

In the Normal Mode the device is able to receive data from the CAN bus and to transmit messages to the CAN bus.

The IFX1050G enters Normal Mode by setting the INH input to logical “LOW” and the RM input to logical “HIGH”

(see Figure 3).

4.2

Stand - By Mode

Stand - By Mode is a Low - Power mode with reduced current consumption on the power supply

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In Stand - By Mode the receiver and the transceiver of the IFX1050G are disabled and the device can not receive

any data from the CAN bus, nor transmit any data to the CAN bus. The IFX1050G enters Stand - By Mode by

setting the INH input to logical “HIGH” (see Figure 3).

When the Stand - By mode is not used the INH pin has to be connected to GND in order to switch the IFX1050G

permanently into Normal Mode.

4.3

Receive - Only Mode

The Receive - Only Mode can be used for diagnostic purposes (to check the bus connections between the nodes)

as well as to prevent the bus being blocked by a faulty permanent dominant TxD input signal. In Receive - Only

Mode the output stage of the transceiver IFX1050G is disabled. The IFX1050G can not send any data to the

CAN bus, but is still able to receive data from the CAN bus. The IFX1050G enters Receive - Only Mode by setting

the RM input and the INH input to logical “LOW” (see Figure 3).

In case the Receive - Only Mode is not used, the RM pin can be left open or it can be also connected to the power

supply

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AED02924

Normal Mode

INH = 0

RM = 1

INH = 0

Receive-only Mode

RM = 0

INH = 1

Stand-by Mode

RM = 0 / 1

INH = 0

and RM = 0

INH = 1

INH = 1

INH = 0

and RM = 1

RM = 0

RM = 1