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STM32W108HB Datasheet(PDF) 85 Page - STMicroelectronics |
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STM32W108HB Datasheet(HTML) 85 Page - STMicroelectronics |
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85 / 278 page  STM32W108HB STM32W108CC STM32W108CB STM32W108CZ Integrated voltage regulator Doc ID 16252 Rev 14 85/278 7 Integrated voltage regulator The STM32W108 integrates two low dropout regulators to provide 1.8 V and 1.25 V power supplies. The 1V8 regulator supplies the analog and memories, and the 1V25 regulator supplies the digital core. In deep sleep the voltage regulators are disabled. When enabled, the 1V8 regulator steps down the pads supply voltage (VDD_PADS) from a nominal 3.0 V to 1.8 V. The regulator output pin (VREG_OUT) must be decoupled externally with a suitable capacitor. VREG_OUT should be connected to the 1.8 V supply pins VDDA, VDD_RF, VDD_VCO, VDD_SYNTH, VDD_IF, and VDD_MEM. The 1V8 regulator can supply a maximum of 50 mA. When enabled, the 1V25 regulator steps down VDD_PADS to 1.25 V. The regulator output pin (VDD_CORE, (Pin 17) must be decoupled externally with a suitable capacitor. It should connect to the other VDD_CORE pin (Pin 44). The 1V25 regulator can supply a maximum of 10 mA. The regulators are controlled by the digital portion of the chip as described in Section 6: System modules. Table 12. 1.8 V integrated voltage regulator specifications Parameter Min. Typ. Max. Units Comments Supply range for regulator 2.1 3.6 V VDD_PADS 1V8 regulator output -5% 1.8 +5% V Regulator output after initialization 1V8 regulator output after reset -5% 1.75 +5% Regulator output after reset 1V25 regulator output -5% 1.25 +5% V Regulator output after initialization 1V25 regulator output after reset -5% 1.45 +5% Regulator output after reset 1V8 regulator capacitor 2.2 µF Low ESR tantalum capacitor ESR greater than 2 Ω ESR less than 10 Ω De-coupling less than100 nF ceramic 1V25 regulator capacitor 1.0 µF Ceramic capacitor (0603) 1V8 regulator output current 050 mA Regulator output current 1V25 regulator output current 010 mA Regulator output current No load current 600 µA No load current (bandgap and regulators) 1V8 regulator current limit 200 mA Short circuit current limit 1V25 regulator current limit 25 mA Short circuit current limit |
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