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L9663 bảng dữ liệu(PDF) 21 Page - STMicroelectronics |
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L9663 bảng dữ liệu(HTML) 21 Page - STMicroelectronics |
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21 / 104 page  DocID028693 Rev 1 21/104 L9663 Power supply 103 If an overcurrent condition on PSIx is detected, the current limitation is active and after a filter time tfilt a fault bit is set and the interface is shut off. In order to switch on again, the interface must be first switched off by SPI and then switched on, as for over temperature. The channels’ switch off by overcurrent can be disabled if the corresponding bits STG_MASK for every channel are set in the SPI registers. During start up, a configurable blanking time is implemented (128 μs/5 ms/10 ms, see BLANKING_SEL bits in SPI register); during this time current limitation is active, even though the interface will not shut off for overcurrent, thermal shutdown is always active, the PSI5 receiver is disabled, and some fault flags are masked (short to battery, under voltage, leakage to ground). The quiescent current is monitored for minimum and maximum value, depending on the range selected by SPI (CH1_CR1, QC_SEL bits). In failure case the corresponding bit in the diagnostic register is set (SR2). The voltage at PSIx is compared with VAS to monitor short to battery condition: if an over voltage occurs PSIx is disconnected from VAS and the corresponding bit in diagnostic register is set (STBx in SR2), In over voltage condition also low quiescent current bit is set (OLx in SR2) after a transient time. Figure 10. Block diagram Transceiver 1 |
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