Datasheet

L6474 Functional description
Doc ID 022529 Rev 3 23/52
Figure 7. OSCIN and OSCOUT pin configurations
Note: When OSCIN is UNUSED, it should be left floating.
When OSCOUT is UNUSED it should be left floating.
6.9 Overcurrent detection
When the current in any of the power MOSFETs exceeds a programmed overcurrent
threshold, the STATUS register OCD flag is forced low until the overcurrent event has
expired and a GetStatus command is sent to the IC (see Section 9.1.13 and Section 9.1.9).
Overcurrent event expires when all the power MOSFET currents fall below the programmed
overcurrent threshold.
The overcurrent threshold can be programmed through the OCD_TH register in one of 16
available values ranging from 375 mA to 6 A with steps of 375 mA (see Section 9.1.9).
It is possible to set whether or not an overcurrent event causes the MOSFET turn-off
(bridges in high impedance status) acting on the OC_SD bit in the CONFIG register (see
Section 9.1.12). The OCD flag in the STATUS register is raised anyway (see Tabl e 28 ,
Section 9.1.13).
When the IC outputs are turned off by an OCD event, they cannot be turned on until the
OCD flag is released by a GetStatus command.
Attention: The overcurrent shutdown is a critical protection feature. It is
not recommended to disable it.