Output error detection

AN4374

18/25

DocID025366 Rev 2

Error detection conditions:

During the error detection phases for each channel, the following parameters are checked:

•

The output current in open detection mode (digital key: 9 CLK rising edges when LE is

"1").

•

The output voltage in short detection (digital key: 10 CLK rising edges when LE is "1").

•

Both parameters (output voltage and current) in combined error detection mode (digital

key: 11 CLK rising edges when LE is "1").

The thresholds for the error diagnostics are listed in Table 5:

Table 5. Diagnostics thresholds

Error detection modes

Checked

malfunction

CFG-9 CFG-8

Thresholds (V)

Min.

Typ.

Max.

Open

detection

Combined

mode

Open line or output

short to GND

xx

Short

detection

Short on LED or

00

1.15

2.05

01

2.25

2.75

10

2.75

3.25

11

3.25

3.80