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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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EM357-RTR 数据表(PDF) 217 Page - List of Unclassifed Manufacturers |
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EM357-RTR 数据表(HTML) 217 Page - List of Unclassifed Manufacturers |
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217 / 240 page  EM351 / EM357 16 Integrated Voltage Regulator The EM35x integrates two low dropout regulators to provide 1.8 V and 1.25 V power supplies, as detailed in Table 16-1. 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 Chapter 6, System Modules. An example of decoupling capacitors and PCB layout can be found in the application notes (see Ember’s various EM35x reference design documentation). Table 16-1. Integrated Voltage Regulator Specifications Spec Point 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 than 100 nF ceramic 1V25 regulator capacitor 1.0 µF Ceramic capacitor (0603) 1V8 regulator output current 0 50 mA Regulator output current 1V25 regulator output current 0 10 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 1V8 regulator start-up time 50 µs 0 V to POR threshold 2.2 µF capacitor 1V25 regulator start-up time 50 µs 0 V to POR threshold 1.0 µF capacitor 16-1 120-035X-000D Preliminary |
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