Datasheet

L9826 Functional description
Doc ID 7214 Rev 10 15/19
5.3.1 Diagnostic on Outputs 1 and 2 controlled via NON1/NON2
Fault condition (1) "output shorted to Vbat"
The output has been previously switched-on and its voltage exceeds the diagnostics
threshold. It operates in current regulation mode or it is switched-off if thermal shutdown
threshold (T
JSC
) is reached. The status bit is low.
Fault condition (2) "open load" or "output shorted to GND"
The output is switched-off and its voltage drops below the diagnostics threshold because
the load current is lower than the output diagnostic current source. The diagnostic bit is low.
5.3.2 Diagnostic on Outputs 1 to 8 controlled via SPI
Fault condition (1) "output shorted to Vbat"
The output was previously switched-on, its voltage exceeds the diagnostic threshold and the
result is that the output is switched-off. The diagnostic bit is high.
Fault condition (2) "open load" or "output shorted to GND"
It is the same behavior explained for the outputs 1 and 2 (see paragraph 5.3.1), at NCS
falling edge the output status data are transferred to the shift register.
Load diagnostic: when the output is in OFF condition a typical diagnostic current of 60 µA is
sinked.
Table 8. Diagnostic table for outputs 1 and 2 in parallel controlled mode
Output 1, 2 Output-voltage Status-bit Output-mode
off > DG-threshold high correct operation
off < DG-threshold low fault condition 2)
on < DG-threshold high correct operation
on > DG-threshold low fault condition 1)
Table 9. Diagnostic table for outputs 1 to 8 in SPI controlled mode
Output 1 ... 8 Output-voltage Status-bit Output-mode
off > DG-threshold high correct operation
off < DG-threshold low fault condition 2)
on < DG-threshold low correct operation
on > DG-threshold high fault condition 1)