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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9918 датащи(PDF) 28 Page - STMicroelectronics |
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L9918 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 109 page  Following lists reports feature and functions active during the pre-excitation in case VBSPLINRG < VB and in case VBSPLINRG > VB respectively. VBSPLINRG < VB+: • EXC duty cycle fixed to 25% (except in case current limitation active). • LRC function disabled. • Phase regulation disabled. • Default Excitation current limitation selectable with NVM bit selection (IMAX_VE). • Safety function enabled. To be noted that in this case current limitation threshold can’t be set by LIN communication. It can just be set by NVM programming. VBSPLINRG > VB+: • EXC duty cycle goes to 100% (except in case current limitation active). • LRC function enabled without LRC return (LRC return value=0s); • Phase regulation disabled • Default Excitation current limitation selectable with NVM bit selection (IMAX_VE) • Excitation current limitation by LIN protocol enabled, so LIN protocol can impose a lower current limitation value. • Safety function enabled. Figure 12 and 13 reports two examples of device behavior when SV_FORD_EN = 1. It can be noticed that while VBSPLINRG < B+, EXC DC remains steady to 25%. While VBSPLINRG > B+, EXC duty cycle is affected by LRC and current limitation function. When these functions are not applied, EXC DC goes to 100%. Figure 12. Pre-excitation specific mode: example 1 L9918 EXC characteristics DS13000 - Rev 2 page 28/109 |
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