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MM912F634CV2AP Datasheet(PDF) 60 Page - Freescale Semiconductor, Inc |
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MM912F634CV2AP Datasheet(HTML) 60 Page - Freescale Semiconductor, Inc |
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60 / 335 page  Functional Description and Application Information Power Supply MM912F634 Freescale Semiconductor 60 Figure 17. MM912F634 Power Supply 4.4.1 Voltage Regulators VDD (2.5 V) & VDDX (5.0 V) To supply the MCU die and minor additional loads two cascaded voltage regulators have been implemented, VDDX (5.0 V) and VDD (2.5 V). External capacitors (CVDD) and (CVDDX) are required for proper regulation. 4.4.2 Power Up Behavior / Power Down Behavior To guarantee safe power up and down behavior, special dependencies are implemented to prevent unwanted MCU execution. Figure 18 shows a standard power up and power down sequence. VDDX (5V) Regulator VDD (2.5V) Regulator HSUP (18V) Regulator HS1 & HS2 ADC ÷ HSUP HS1 HS2 VDDX VDD ADC 2.5V Reference VDDXINTERNAL VDDINTERNAL ADC2p5 CVDDX CVDD CADC CHSUP HVI LVI LBI LVR LVRX VROV bg1p25sleep |
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