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ALC5642R-VF-CG 数据表(PDF) 24 Page - Realtek Semiconductor Corp. |
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ALC5642R-VF-CG 数据表(HTML) 24 Page - Realtek Semiconductor Corp. |
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24 / 156 page  ALC5642-VF Datasheet Multi-Channel Audio Hub/CODEC with embedded Voice DSP and SounzReal TM Digital Sound Effect 12 Rev. 0.93 7.2. Power Supply On/Off Sequence To prevent pop noise and make sure function work normally, following power on and off sequence are recommended. Case1: For SPKVDD is from battery: Power On Sequence: (Sequentially turn on power pins) 1. Pull LDO1_EN pin (Pin#44) to DGND (digital ground) 2. SPKVDD power supply on 3. DCVDD power supply on (This step is required if DCVDD is supplied by external 1.2V power. This step and Step 5 are exclusive.) 4. DBVDD/AVDD/DACREF/CPVDD=1.8V power supply on 5. DBVDD power supply on (This step is required if DBVDD is supplied higher than 1.8V) 6. MICVDD power supply on (This step is required if MICVDD is supplied by external power) 7. Pull LDO1_EN pin (Pin#44) to DBVDD (This step is required if DCVDD is generated by internal LDO. This step and step 3 are exclusive. If DCVDD is supplied by external 1.2V, LDO1_EN must be pulled low.) 8. Initialize voice DSP and codec of ALC5642. 9. Power down voice DSP of ALC5642. (Write 0x0400 ’h to register MX-C6’h) Power Off Sequence: (Sequentially turn off power pins) 1. Power down voice DSP of ALC5642. (Write 0x0400 ’h to register MX-C6’h) 2. Power down all Codec function (Write 0x0000 ’h to register MX-00’h) 3. Pull LDO1_EN pin (Pin#44) to DGND (If internal LDO is used to generate DCVDD) 4. MICVDD power supply off (If MICVDD is supplied by external power) 5. DBVDD power supply off (This step is required if DBVDD is supplied higher than 1.8V) 6. DBVDD/AVDD/DACREF/CPVDD power supply off 7. DCVDD power supply off (If DCVDD is supplied by external power) 8. SPKVDD power supply off |
类似零件编号 - ALC5642R-VF-CG |
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类似说明 - ALC5642R-VF-CG |
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