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L9969T Datasheet(PDF) 47 Page - STMicroelectronics |
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L9969T Datasheet(HTML) 47 Page - STMicroelectronics |
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47 / 70 page  In DIA_REG1 the errors are stored. A read process does not reset DIA_REG1. Reported errors are: Open Load (OL), Over Temperature (OT), Short Circuit (SCG1, SCG2, SCB1, SCB2, SCL). General description, how the DIA_REG1 and the DIA_REG2 are related together: • Any time, an error is detected, the HBR is switched off (exception: Open Load diagnosis) • The detected error is to be confirmed or in the case of short circuit to clarify, if single SC or SCL • The confirmed error is set in DIA_REG1 • The HBR can only becomes active again after a Power-On Reset (POR), after a disable-enable sequence (ENDISR), or after setting DIACLR1 • The HBR is disabled by the operating software in the control unit, this is the usual procedure • Some other action from the operating software in the control unit may happen, f.i. resetting DIA_REG1 • So in the DIA_REG1 there is still the error code or the DIA_REG is reset • Finally the HBR will be enabled again (ENDISR or DIACLR1) by the operating software If a fault is detected, the H-bridge is switched off and the error is entered in the DIAREG1 (short circuit error after confirmation). After EN/DIS sequence or setting DIACLR1 the diagnostic related to the error in DIAREG1 is transferred to DIAREG2 and DIAREG1 is cleared. If now another error happens, the H-bridge is switched off and the new error is entered in the DIAREG1. Remarks: The errors can be reset selectively. By writing STATCON_REG.DIACLR2 = 0, this resets all errors in DIA_REG2, that is the previous errors. By writing STATCON_REG.DIACLR1 = 0, this transfers all latched errors from DIA_REG1 to DIA_REG2 and resets DIA_REG1 afterwards, if there is no under voltage condition existing. To completely delete the whole error log, the following sequence has to be transmitted via SPI: • STATCON_REG.DIACLR1 = 0 • STATCON_REG.DIACLR2 = 0 Undervoltage at VS (there is no error but condition): If there is any error stored and additional the condition ‘undervoltage’ occurs, the condition ‘undervoltage’ is reported as long as the undervoltage condition is present. If the undervoltage condition disappears, the previously reported error is present again until it is reset. NABE_DIS always shows directly the status of the power stages. NABE_DIS is set to ‘0’, if the power stages are disabled by NABE or DIS or (NABE and DIS). Table 34. Register DIA_REG2 Bit 7 6 5 4 3 2 1 0 Bit-Name CurrRed CurrLim OT Var2 DIA21 DIA20 DIA11 DIA10 POR 1 1 1 0 1 1 1 1 SPIR 1 1 1 x 1 1 1 1 ENDISR 1 1 x x x x x x RDR 1 1 x x x x x x DIACLR2 1 1 1 x 1 1 1 1 Controller access: read/write (write-access: WR_DIA2)) (read-access: RD_DIA2 Bit Name Description 7 CurrRed Temperature depend current reduction (TDCR) [no error] 0: TDCR is active (latched) (r) 1: TDCR is not active 6 CurrLim Current Limitation (CL) [no error] 0: CL is active (latched) (r) L9969x Functional description DS14029 - Rev 6 page 47/70 |
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