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L9825
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Fault condition 2) "open load" or "output short circuit to GND" : the output is switched off and the voltage at the
output drops below the diagnostics threshold, because the load current is lower than the output diagnostic cur-
rent source, the load is interrupted. The diagnostic bit is low.
For outputs 3 to 8 the output status signals, are fed directly to the SPI register.
Table 3. Diagnostic for outputs 1 to 8 in SPI controlled mode.
The fault condition 1) "output short circuit to Vbat" :
For outputs 3 to 6 is the same as of outputs 1 and 2.
For outputs 7 and 8 : the output was switched on and the voltage at the output exceeds the diagnostics thresh-
old. The output operates in current regulation mode or has been switched off due to thermal shutdown. The sta-
tus bit is low.
Fault condition 2) "open load" or "output short circuit to GND" is the same as of outputs 1 and 2.
At the falling edge of NCS the output status data are transferred to the shift register. When NSC is low, data bits
contained in the shift register are transferred to SDO output et every rising CLK edge.
Figure 3. The Pulse Diagram to Read the Outputs Status Register
Figure 4. The Structure of the Outputs Status Register
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)
NCS
CLK
SDI
SDO
MSB
LSB
654321
MSB
LSB
654321