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MC10XS3435DHFK Datasheet(PDF) 33 Page - Freescale Semiconductor, Inc |
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MC10XS3435DHFK Datasheet(HTML) 33 Page - Freescale Semiconductor, Inc |
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33 / 51 page  Analog Integrated Circuit Device Data Freescale Semiconductor 33 10XS3435 FUNCTIONAL DEVICE OPERATION PROTECTION AND DIAGNOSTIC FEATURES Figure 13. Autoretry State Machine AUTORETRY The autoretry circuitry is used to reactivate the output(s) automatically in case of over-current or over-temperature or under-voltage failure conditions to provide a high availability of the load. Autoretry 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 autoretry 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 autoretry, the over- current detection will be set to default values in order to sustain the inrush current. The Figure 13 describes the autoretry state machine. DIAGNOSTIC Output Shorted to VPWR Fault The 10XS3435 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[0:3] and OL_OFF[0:3] fault bits are set in the status register and FS 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[0:3] bit). Open-Load Faults The 10XS3435 incorporates three dedicated open-load detection circuitries on the output to detect in OFF and in ON state. Open-load Detection In Off State The OFF output open-load fault is detected when the output voltage is higher than VOLD(THRES) pulled up with internal current source (IOLD(OFF)) and reported as a fault condition when the output is disabled (OFF). The OFF Output open-load fault is latched into the status register or when the internal gate voltage is pulled low enough to turn OFF the output. The OL_OFF[0:3] fault bit is set in the status register. If the open load fault is removed (FS output pin goes to high), the status register will be cleared after reading the register. The OFF output open-load protection can be disabled through SPI (OLOFF_DIS[0:3] bit). OFF ON Latched OFF Autoretry OFF Autoretry ON (SC=1) (OV=1) (fault_control=1 and OV=0) (fault_control=0 or OV=1) (fault_control=0) (fault_control=0) (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) (OpenloadON=1) or OV=1) or OV=1) or OV=1) if hson=1 if hson=0 if hson=1 |
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