17XSF500 Datasheet, PDF (31/70 Pages) Freescale Semiconductor, Inc – Penta 17 mOhm High Side Switch

Normal mode
The enabling of the high current window (OCHI1… OCHI3) is dependent on CHx signal.
When no control input pin is enabled, the control of the overcurrent window depends on the ON bits inside channel control
registers #2… #7 or the output control register #8.
When the corresponding CHx signal is
• toggled (turn OFF and then ON), the OCHI window counter is reset and the full OCHI windows are applied
current
IOCHI1
IOCHI2
Overcurrent Threshold Profile
IOCHI3
OCLO fault detection
IOCLO
Channel Current
ON bit =0 ON bit =1
time
Figure 17. Resetable Overcurrent Profile
• rewritten (logic [1]), the OCHI window time is proceeding without reset of the OCHI counter
current
IOCLO
OCLO fault detection
time
ON bit =1 rewriting
Figure 18. Over Current Level Fixed to OCLO
Fail mode
The enabling of the high current window (OCHI1… OCHI3) is dependent on INx_ON toggle signal.
The enabling of output (OUT1… 5) is dependent on CHx signal.
Analog Integrated Circuit Device Data
Freescale Semiconductor
MC17XSF500
31