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GPL32611B Datasheet(PDF) 18 Page - Generalplus Technology Inc. |
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GPL32611B Datasheet(HTML) 18 Page - Generalplus Technology Inc. |
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18 / 22 page  GPL32611B © Generalplus Technology Inc. Proprietary & Confidential 18 Oct. 02, 2018 Version: 1.3 7. RECOMMENDED BOARD LAYOUT 7.1. Power and Ground All power and ground pins are connected as in the following diagram for general application. The decoupling capacitor of 0.1 F and 10F should be connected to each corresponding power pin of the IC and 0.1uF capacitor must be as close as possible to the power pin. The POWER BEAD is optional for higher quality. GPL3260xB 3.3V VDD12 VSS V12_REG VSS_REG VSS_REG VSS_CLKEGN VSS_USB VSS_VDAC VSS_ADC VSS_DA16 Ground POWER BEAD 10 F V33_RTC 2.2 F 2.2 F VSS_PWM VDD12_MIPI 0.1 F Ground POWER BEAD V12_FB V33_REG VSS_REG 0.1 F V33_PWM VSS_PWM 0.1 F V33_USB VSS_USB 0.1 F V33_CLKGEN VSS_CLKGEN 0.1 F 0.1 F V33_VDAC VSS_VDAC 0.1 F V33_ADC VSS_ADC 0.1 F V33_DA16 VSS_DA16 0.1 F VDD33 VSS 0.1 F POWER BEAD POWER BEAD POWER BEAD POWER BEAD POWER BEAD POWER BEAD POWER BEAD 0.1 F VSS POWER BEAD POWER BEAD POWER BEAD POWER BEAD POWER BEAD POWER BEAD POWER BEAD VSS POWER BEAD 7.2. Crystal and PLL When the 12MHz crystal is utilized in the system, normally for USB application, no additional circuit is required. For TV application requiring precise 12M clocks, please refer the follow diagram for crystal circuit connection. X12MI X12MO 12MHz C1* C2* Note*: C1 and C2 suggest values by follow rules: ic stray L 2 1 C 2 x ) C C ( C C ic C : IC internal capacitance is equal 15p 10%. stray C ：Stray capacitance in the circuit and PCB board get by measurement. L C : Load capacitance of 12M crystal get by crystal spec. Note2: if Vpp ’s min = 1.2V @VDD =3.3V or Vpp’s min = 1V @VDD =2.6V, the 12MHz crystal works normally. X32KI X32KO CL2* 32768 Hz CL2* BM[2] A Crystal (32768Hz) may be used for applications requiring precise time clocks. See the above diagram for details. Note*: Please refer to the crystal’s application circuit. If 12MHz crystal is disabled to reduce cost of system BOM (Bill of Materials), please refer to the following diagram for crystal circuit connection. X32KI X32KO 32768 Hz CL2* CL2* BM[2] X12MI 7.5K 3.3n 47n Note1: If 12M crystal is not utilized in the system, it will not support USB and TV function. GPL3261xB |
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