07XSC200 datasheet(33/51 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

07XSC200

Figure 13. Auto-retry State Machine

5.3.2

Auto-retry

The auto-retry circuitry is used to reactivate the output(s) automatically in case of overcurrent or overtemperature or undervoltage

failure conditions to provide a high availability of the load.

Auto-retry feature is available in Fault mode. It is activated in case of internal retry signal is set to logic [1]:

retry[x] = OC[x] or OT[x] or UV.

The feature retries to switch-on the output(s) after one auto-retry period (tAUTO) with a limitation in term of number of occurrence

(16 for each output). The counter of retry occurrences is reset in case of Fail-safe to Normal or Normal to Fail-safe mode

transitions. At each auto-retry, the overcurrent detection will be set to default values in order to sustain the inrush current.

The Figure 13 describes the auto-retry state machine.

5.3.3

Diagnostic

Output Shorted to VPWR Fault

The 07XSC200 incorporates output shorted to VPWR detection circuitry in OFF state. Output shorted to VPWR fault is detected if

output voltage is higher than VOSD(THRES) and reported as a fault condition when the output is disabled (OFF). The output shorted

to VPWR fault is latched into the status register after the internal gate voltage is pulled low enough to turn OFF the output. The

OS[0:1] and OL_OFF[0:1] fault bits are set in the status register and FSB pin reports in real time the fault. If the output shorted

to VPWR fault is removed, the status register will be cleared after reading the register.

The open output shorted to VPWR protection can be disabled through SPI (OS_DIS[0:1] bit).

OpenLoad Faults

The 07XSC200 incorporates three dedicated OpenLoad detection circuitries on the output to detect in OFF and in ON state.

OFF

Latched

OFF

Auto-retry

OFF

Auto-retry

(SC=1)

(OV=1)

(fault_control=1 and OV=0)

(fault_control=0 or OV=1)

(fault_control=0)

(SC=1)

(Retry=1)

=> count=count+1

(Retry=1)

(count=16)

(after Retry Period and OV=0)

(OpenloadOFF=1

or ShortVpwr=1

(OpenloadOFF=1

or ShortVpwr=1

(OpenloadOFF=1

or ShortVpwr=1

(OpenloadON=1)

or OV=1)

if hson=1

if hson=0

if hson=1

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