M54617P Просмотр технического описания (PDF) - Mitsumi

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M54617P

LAN TRANSCEIVER

Mitsumi 

MITSUBISHI <CONTROL / DRIVER IC>

M54617P

LAN TRANSCEIVER

Table 1. Abnormality mode and abnormality detection function

Abnormality mode

1

GND short

2 BUS(+)

VDD short

3

Open

4

GND short

5 BUS(-)

VDD short

6

Open

7 BUS(+) and BUS(-) short

Error output

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Communication after

abnormality is detected

Yes

Yes

Yes

Yes

Yes

Yes

No

Abnormality

detection method

(2)

(1), (2)

(2)

(1), (2)

(2)

(2)

(1)

ERROR RESET

Error output of the M54617P can be reset by turning to the standby

mode (STB pin (pin 2) = “L”), followed by inputting “H” level to ERR

pin (pin 3). In this case, all operations are cleared that relate to

abnormality detection including overcurrent detection and switching

of Rx output.

STANDBY MODE

The M54617P can be set to the low current dissipation mode by

turning STB pin (pin 2) to level “L”.

Standby mode does not allow the driver and overcurrent detection

function to be operated, but logic abnormality detection function

operates, which permits detection other than abnormality relating

to overcurrent detection. However, it provides error signal output

only, but no switching of Rx output signal.

Rx output when in the standby mode outputs the logic sum of

BUS(+) and BUS(-) signals.

I/O EQUIVALENT CIRCUIT

1 Tx and STB input

2 ERR I/O

3 Rx output

4 BUS(+) and BUS(-) I/O

BUS (+)

BUS (-)

Filter time constant

RC = 110E-9 (standard)

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