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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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SPSB100 Datenblatt(PDF) 16 Page - STMicroelectronics |
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SPSB100 Datenblatt(HTML) 16 Page - STMicroelectronics |
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16 / 213 page  Figure 10. Battery drop behavior VS VFBB digital por_n BOOST enable analog por_n BUCKs on BUCKs off SBSB100 state IRQ ACTIVE or REC-1 or REC-2 or INIT state BOOST switching BYPASS ON BOOST switching executes Power-Up sequence REC-1 Trig WD ACTIVE 13.5V Safety checks REC-2 INIT State depends on SW action No IRQ, but flag is set FBB_UV_EW FBB_UV POR not reaches SPSB100 restarts Always high Always high VFBB_UV_F # 4.9 or 5.75V VVS_UV_EW VPORVS_F # 2.15V VFBB_UV_EW programmable from 8.36V to 5V VFBB_UV_R # 5.25 or 6.25V VFBB_REG # 8 or 9.5V VTH_BYPASS_Rn # 9 or 10.5V VTH_BYPASS_Fn # 8.75 or 10V VFBB_OK_R # 7.2 or 9V VS_UV_EW (1) (1) (1) Digital comparator in ACTIVE – Full-Power & REC -1, programmable threshold. IRQ flags : EW = Early warning Overvoltage cases are not critical for the boost itself (the bypass is ON) but for the regulators (BUCKs, LDOs…) that are directly supplied. These are managed according to configured thresholds (through VFBB_OV threshold) which trigger in any case a power down sequence. Power up is initiated as long as the voltage decreases below the overvoltage FBB_OV_F. Undervoltage cases are critical for the regulators (BUCKs, LDOs…) that are directly supplied. These are managed according to configured thresholds (through VFBB_UV_F threshold) which trigger in any case a power down sequence. Power-up is initiated as long as the voltage increase above the undervoltage related threshold VFBB_UV_R. SPSB100 Functional description DS14640 - Rev 2 page 16/213 |
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