The contents and format of the status groups and the LER are as follows :

LVD:

Bit

Logical 1

Logical 0 (default value)

0

1

2

3

O0 low voltage

O1 low voltage

O2 low voltage

O3 low voltage

O0 voltage normal

O1 voltage normal

O2 voltage normal

O3 voltage normal

The Low Voltage Detector (LVD) indicates the voltage level on the output lines, even when the lines are

disabled. The low-voltage condition becomes active (logical 1) if the output reaches the Low Voltage

Threshold (VLVD).

LEC:

Bit

Logical 1

Logical 0

0

1

2

3

SWITCH ON

SWITCH ON

SWITCH ON

SWITCH ON

SWITCH OFF

SWITCH OFF

SWITCH OFF

SWITCH OFF

The Line Enable Command (LEC) indicates the status of the DMOS SWITCH OUTPUT.

OLD:

Bit

Logical 1

Logical 0 (default value)

0

1

2

3

O0 open loop

O1 open loop

O2 open loop

O3 open loop

O0 current normal

O1 current normal

O2 current normal

O3 current normal

The Open Loop Detector (OLD) indicates the open-loop condition on the output lines. The open-loop

condition becomes active (logical 1) if the current on the line drops below the threshold value ISOC.

COD:

Bit

Logical 1

Logical 0 (default value)

0

1

2

3

O0 current overload

O1 current overload

O2 current overload

O3 current overload

O0 current normal

O1 current normal

O2 current normal

O3 current normal

The Current Overload Detector (COD) indicates the current-overload condition on the output lines. The

overload condition becomes active (logical 1) if the output current approaches the value programmed by

an external resistor between ILIM and VBB.

TOR :

Bit

Logical 1 (default value)

Logical 0

0

1

2

3

O0 operational

O1 operational

O2 operational

O3 operational

O0 off

O1 off

O2 off

O3 off

The Thermal Overload Register (TOR) contains the overload status of the output line drivers. If the de-

vice temperature reaches 130

will be switched off. The corresponding bits in the TOR will be set to a logical 0. To initialize any of the

bits in the TOR, the microprocessor must first turn off the output line drivers via the LER. However, the

TOR bits cannot be deactivated if the 160

via the LER after the TOR condition is removed. The TOR is a read-only register.

STLC5444

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