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EM6821WW15 Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA |
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EM6821WW15 Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA |
7 / 68 page R EM6821 Copyright © 2005, EM Microelectronic-Marin SA 7 www.emmicroelectronic.com 3. Power Supply The EM6821 is supplied by a single external power supply between VDD (Vbat) and VSS (Ground). A built-in voltage regulator generates Vreg providing regulated voltage for the oscillator and the internal logic. The output drivers are supplied directly from the external supply VDD. The internal power configuration is shown below in Figure 5. To supply the internal core logic it is possible to use either the internal voltage regulator (Vreg < VDD) or Vbat directly ( Vreg = VDD). The selection is done by metal 1 mask option. By default the voltage regulator is used. Refer to chapter 18.1.5 for the metal mask selection. The internal voltage regulator is chosen for high voltage systems. It saves power by reducing the internal core logic’s power supply to an optimum value. However, due to the inherent voltage drop over the regulator the minimal VDD is restricted to 1.4 V . A direct Vbat connection can be selected for systems running on a 1.5 V battery. The internal 1 KOhm resistor together with the external capacitor on Vreg is filtering the VDD supply to the internal core. In this case the minimum VDD can be as low as 1.2 V. Figure 5. Internal Power Supply R ef. Logic Term inal Vreg T erm inal V bat R ef. LC D A ll P ad input & output buffers, SV LD C ore Logic, LC D Logic, O scillator V oltage m ultiplier, LC D outputs M1 B M1 A 1kO hm MV reg |
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