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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) 15 Page - STMicroelectronics |
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SPSB100 Datenblatt(HTML) 15 Page - STMicroelectronics |
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15 / 213 page  If the BOOST function is not used (USER-NVM BOOST_DIS = ’1’ or SPI bit BOOST_OFF = 1): • At power-up, the bypass control is enabled, turning on the external switch (BYPASS_STATUS = 1), as soon as the state machine reaches the INIT state and following successful safety checks. • In ACTIVE–FULL-POWER mode and in RECOVERY-1 state, the BYPASS switch is turned on whatever the VS voltage (BYPASS_STATUS = 1). • In ACTIVE–LOW-POWER mode, DEEP-SLEEP or RECOVERY-2 state, the BYPASS controller is disabled, turning off the external switch (BYPASS_STATUS = 0). The block diagram of the device when boost is not used is shown in the figure Figure 8. Note: The D1_rev_protection diode is needed only if there is not a reverse battery protection solution already implemented in the application. Figure 8. Boost controller disabled block diagram Logic GLB Boost Driver Stage FBB Vth Boost_En PWM Duty Cycle Control AND Enable VS Vbat D1_rev_protection Output voltage sense GBY Bypass Driver V compth1 V compth2 V compth3 Rpr CVBAT DLB 3.2.1 Power-up/down and voltage drop behavior The boost role is crucial for SPSB100 operation, so its behavior related to normal or accidental variation of voltage supply should be clearly defined. General behavior is described in the following figures. Figure 9. Battery plug/unplug behavior VS VFBB 1xVT analog 3.3V begins to rise BGP, dig 3.3V woken up digital por_n all 3.3V monitoring ok clocks, vref, iref available starts osc, vref, iref Read NVM START - UP POWER-OFF START-SM VFBB_UV_R # 5.25 or 6.25V BOOST enable VFBB high enough in INIT state to start the BOOST IP VS high enough => no need to boost INIT analog por_n VS < 3V not enough to ensure the BOOST performances, IRQ sent to MCU POWER-OFF BUCKs on BUCKs off SBSB100 state BOOST switching executes Power-Up sequence REC-1 Trig WD VS high enough => no need to boost State depends on SW action IRQ ACTIVE ACTIVE or REC-1 or REC-2 or INIT state VS_UV_EW FBB_UV_EW 13.5V Early Warning IRQ sent to MCU SW able to react SPSB100 forces transition to INIT via REC-2 with active pull down on regulator outputs, SPSB100 ready to restart FBB_UV IRQ flags : Safety checks BOOST switching BOOST switching VFBB high enough to start Power-Up sequence (1) (1) (1) (1) Digital comparator in ACTIVE – Full-Power & REC -1, programmable threshold. BYPASS ON BYPASS turned ON REC-2 INIT No IRQ, but flag is set EW = Early warning VFBB_UV_F # 4.9 or 5.75V VFBB_REGn # 8 or 9.5V VTH_BYPASS_Rn # 9 or 10.5V VTH_BYPASS_Fn # 8.75 or 10V BYPASS turned OFF VFBB_OK_R # 7.2 or 9V VVS_UV_EW Programmable From 2.6 to 9.8V VVS_UV_EW VS_UV_EW VFBB_UV_EW programmable from 8.36V to 5V VPORVS_F # 2.15V VPORVS_R # 4.75 SPSB100 Functional description DS14640 - Rev 2 page 15/213 |
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