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Open-Circuit Detection Principle

Short-Circuit Detection Principle (TLC5917 Only)

NoFault

ShortFault

Minimum

Return

Threshold

Maximum

Trigger

Threshold

3.1V

2.5V

2.2V

V

OUT

Minimum

Trigger

Threshold

V

OUT,TTh

V

OUT,RTh

TLC5916, TLC5917

8-BIT CONSTANT-CURRENT LED SINK DRIVERS

SLVS695A – JUNE 2007 – REVISED MARCH 2008

error status can be read as an error status code in the Special Mode. For open-circuit error detection, a channel

must be on.

Table 1. Open-Circuit Detection

CONDITION OF OUTPUT

STATE OF OUTPUT PORT

ERROR STATUS CODE

MEANING

CURRENT

Off

0

Detection not possible

(1)

0

Open circuit

On

(1)

Channel n error status bit 1

Normal

(1)

status can be read as an error status code in the Special Mode. For short-circuit error detection, a channel must

be on.

Table 2. Shorted-Load Detection

CONDITION OF OUTPUT

STATE OF OUTPUT PORT

ERROR STATUS CODE

MEANING

VOLTAGE

Off

0

Detection not possible

0

Short circuit

On

1

Normal

Figure 18. Short-Circuit Detection Principle

20

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