Nuvoton CODEC 8812 series User Manual

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Nuvoton CODEC 8812 series User Manual Manual pdf 41 page image

CODEC Motherboard Manual Version 1.3 Page 41 of 66 April 12, 2016CODEC Motherboard19.1 Summary of Power Options and LimitsIMPORTANT: Physical orientation of the various power selection jumpers is NOT the same.Each jumper must be examined carefully to determine its Pin #1 designator and orientation. Theconnector Pin #1 is marked with a white square in the silkscreen pattern on the PCB.ConnectorNameSignalNameSupply Rangeand LimitsOptionJumperNamePower optioning descriptionImportant: Note carefully the differingpin #1 positions on each jumperCON1 USB USB host limited n/aPower is normally supplied entirely from the USB host.Series diodes will substitute power from the greater ofeither P1 or from J26 if either source is greater than5Vdc from the USB host.P1 5vDC Center Pin =Positive (+V) 0.0Vdc to 5.5Vdc n/aNote: There is no jumper for this option. Series diodespass power from P1 if this voltage is greater than 5Vdccoming from USBJ6 DGND 0V (digital ground) n/a n/aJ18 EXT_VDDC 1.6Vdc to 3.6Vdc J17Pin 1-2 shorted selects External VDDC via J18Pin 3-4 shorted selects VDDC=VDDBPin 5-6 shorted selects VDDC=1.8VdcJ19 EX_VDDA2.5V to 3.6VVDDA must be ≥VDDCJ21 Pin 1-2 shorted selects external VDDA via J19Pin 2-3 shorted selects VDDA = 3.3VdcJ22 EXT_VDDB 1.8V to 3.6VVDDB must be ≥VDDCJ20 Pin 1-2 shorted selects External VDDB via J22Pin 2-3 shorted selects VDDB=3.3VdcJ26 EXT_+5V_IN 0.0Vdc to 5.5Vdc n/aNote: There is no jumper for this option. Series diodespass power from J26 if this voltage is greater than 5Vdccoming from USBJ36 EX_VDDSPK 2.5V to 5.0V J25Pin 1-2 shorted selects external VDDSPK via J36Pin 3-4 shorted selects built-in 5.0VdcPin 5-6 shorted selects VDDSPK = VDDADefault factory configuration highlighted in colorTable 1: POWER OPTIONS19.2 Main 5Vdc PowerAll power is usually supplied to the NAU8822-EVB USB interface via the USB connector. Itshould be noted that the voltage supplied via USB is nominally 5Vdc. However, this voltagesupplied by the external USB host may be significantly less, especially if driving a loudspeaker athigh volume using the device on the daughter card.With most USB host devices and USB cables, it is not possible to achieve the full rated 1-Watt ofloudspeaker power using only USB as the power source. Additionally, long or poor quality USBcables can cause the EVB to operate unreliably. The USB cable used with the EVB should be ahigh quality product and not longer than 1-meter.If the primary purpose to use alternative power is to drive the speaker output to the full ratedpower, it is preferred to simply substitute an external supply for VDDSPK via J36. EVB operationis simpler if the main 5Vdc power other than for VDDSPK is supplied from the USB host.