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L9779WD-SPI Datasheet(PDF) 65 Page - STMicroelectronics |
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L9779WD-SPI Datasheet(HTML) 65 Page - STMicroelectronics |
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65 / 141 page  DocID027721 Rev 2 65/141 L9779WD-SPI Functional description 140 6.10.1 Ignition pre-drivers functionality description The 4 ignition pre-drivers are push-pull output with diagnosis and over current protection circuit. They can drive IGBT Darlington transistors. The load is switched on with a current and switched off with I_LS_cont current. They are driven by logical-AND of SPI control bit and dedicated parallel input IGN1...IGN4. When Reset_L9779 signal or OUT_DIS bit is asserted, output IGNx becomes high impedance. By SPI command it is possible to have the low-side stage always off, in this case there is an external pull down resistor that discharges The IGNx output in Off phase. This Bit is present in CONFIG_REG2 bit0 and its name is LS_IGN_OFF. Table 28. Ignition pre-drivers electrical characteristics Pin Symbol Parameter Test condition Min Typ Max Unit IGN1 to 4 VDD5 Supply voltage range Info only 4.9 - 5.1 V Vign Output voltage high level I_cont = 15 mA 4.35 - V Ileak_out Leakage current - -10 - 10 µA I_lim High-side current limitation - 19 - 33 mA I_LS_cont LS path continuous current capability Add also the RDSON Test -- 30 mA I_LS_RD S on LS RDSON - 3 - 14 IOVC High side over current detection - 7 - 14 mA VLVT Output short-circuit to Gnd threshold voltage -1.6 1.8 2 V Vign_scb SCB detection voltage - VDD5 +0.1V - VDD5 +2V - Iol OL detection current - 100 - 850 µA Tdon Output on delay time CIgn = 10 nF - - 10 µs Tign_filt OVC/Open load diagnosis filter time, Test by scan -50 - 100 µs Tr Output on rise time CIgn = 10 nF - - 10 µs Tdoff Output off delay time CIgn = 10 nF - - 10 µs Tf Output off fall time CIgn = 10 nF - - 10 µs Rload Resistive load For info only 1 - 10 kΩ Cout Output capacitance loads For info only 4 - 15 nF |
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