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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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AN4635 Scheda tecnica(PDF) 24 Page - STMicroelectronics |
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AN4635 Scheda tecnica(HTML) 24 Page - STMicroelectronics |
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24 / 34 page  Power consumption comparison AN4635 24/34 DocID027290 Rev 1 6.8 ULP bit setting The role of the ULP bit is to disconnect the internal voltage reference during Stop mode. The power analysis screen-shot in Figure 9 illustrates that this setting (black line) achieves lower power consumption in the Stop mode, but produces significant peaks when waking up (compared to green trace without ULP). The microcontroller waiting for incoming data in the ULP mode consumes approximately 0,8 µA compared to almost 3 µA without ULP mode, but if it wakes from idle mode too frequently, the effect is negated by the voltage reference startup peaks. Figure 9. ULP bit effect Table 11. Configurations - ULP bit effect Curve in Figure 9 Black Green Idle mode between transmissions Stop JTAG interface OFF Current average over phases 2, 3 and 4 16.29 µA 15.85 µA Clock 500 kHz MSI Voltage regulator Range 3 AHB/APB ratio 1/1 ULP/FWU +/+ -/- |
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