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EFP01 数据表(PDF) 33 Page - Silicon Laboratories |
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EFP01 数据表(HTML) 33 Page - Silicon Laboratories |
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33 / 158 page  4.1.4 Single-Cell Boost Configuration (EFP0108) The single-cell boost configuration is a variant of the wired boost configuration intended primarily for use cases where the battery nomi- nal voltage may be below the VDDB pin minimum voltage (1.8V) at startup. In this configuration, the EFP01 uses low-voltage supply circuitry powered from the VDDA pin at startup to generate a voltage output on the VOA supply sufficient to meet the VDDB minimum supply input requirement. After startup and once the VDDB voltage is above this minimum, standard boost operation resumes. Note that this configuration requires connecting VDDB to VOA on the printed circuit board. Single-cell boost configuration is suitable for the following: • Single alkaline (Zn/MnO2), zinc-carbon or lithium iron-disulfide (Li/FeS2) primary cells, or NiMH/NiCd rechargeable cells (0.8 to 1.8 V) The supported operating mode settings for each converter in this configuration are shown below: Table 4.4. Supported Operating Mode Settings Converter / LDO Operating Mode Bitfield Supported Modes DCDC A BB_CTRL3.BB_MODE WiredBoost DCDC B BK_CTRL1.BK_MODE Disabled, BuckOnly, BuckLDO, or LDOOn- ly LDO C LDOC_CTRL.LDOC_ENA_SA Enabled or Disabled In the single-cell boost configuration, up to 3 outputs are available. Typical power supply connections for a single-cell boost configura- tion are shown below. ` VOA VOC 10µF 2.2µH 2.2µH VDDB VOA SW VOC LB LDO C VOA Buck DC-DC B Boost DC-DC A Buck DC-DC A VOB LDO B LA2 LA1 Low Voltage VDDA ` VOB ` VIO I2C SDA I2C SCL IRQ Control 0.1µF 10µF 0.1µF 2.2µF 0.1µF VIO 0.1µF ` To Host MCU Main Supply + – VDD (0.8V–1.8V) 10µF 0.1µF VOC output capacitors only required if enabled Figure 4.4. Single-Cell Boost Configuration EFP01 Energy Friendly PMIC Family Data Sheet Typical Connection Diagrams silabs.com | Building a more connected world. Rev. 1.3 | 33 |
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