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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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900844 датащи(PDF) 51 Page - Freescale Semiconductor, Inc |
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900844 датащи(HTML) 51 Page - Freescale Semiconductor, Inc |
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51 / 118 page  Analog Integrated Circuit Device Data Freescale Semiconductor 51 900844 FUNCTIONAL DEVICE OPERATION POWER STATES AND CONTROL Figure 17. 900844 Internal Power Tree Block Diagram As part of the turn on sequence, the 900844 enables a set of internal supplies that provide power to the rest of the circuitry: 1. VCOREREF: This is the main bandgap and reference voltage for all internal circuitries. 2. VCORE: This is the supply for the internal analog circuitry. 3. VCOREDIG: This is the supply for the internal digital circuitry. Table 21 summarizes the voltage references on the 900844. There is an internal node called the Best of Supply node (VBOS), which supplies the Real Time Clock and the Keep Alive Registers. This ensures that power to these critical circuits is maintained for maximum life. VBOS represents the highest of the VBAT and VCOINCELL input voltages. When VCOREDIG is > 1.2 V, an internal switch is closed, and the circuitry that was powered from VBOS is now powered from VCOREDIG. Table 21. 900844 Internal Power Supply Summary Reference Parameter Target VCOREREF (Bandgap & Regulators Reference) Output Voltage 1.2 V Bypass Capacitor 100 nF typ. VCOREDIG (Digital Core Supply) Output Voltage 1.5 V Bypass Capacitor 2.2 μF typ. VCORE (Analog Core Supply) Output Voltage 2.775 V Bypass Capacitor 2.2 μF typ. VBAT VCOINCELL VBOS VCORERTC Keep Alive Bandgap 1.2V CLOCK RC/XTAL Keep Alive Registers 1.2V 0.9V VPWR VCOREREF VCOREDIG VCORE UVDET EN EN EN EN Closed when VCOREDIG > 1.2V 1.5V Digital Supply 1.2V Reference Supply 2.775V Analog Supply ACTIVE STATE RTC STATE |
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