ALC5640VB 데이터 시트보기 (PDF) - Realtek Semiconductor

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ALC5640VB

Multi-Channel Audio Hub/CODEC and SounzReal Digital Sound Effect for Mobile Devices

Realtek Semiconductor 

ALC5640-VB

Datasheet

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 7 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. Software starts to initialize ALC5640.

Power Off Sequence: (Sequentially turn off power pins)

1. Power down all Codec function (Write 0x0000’h to register MX-00’h)

2. Pull LDO1_EN pin (Pin#44) to DGND (If internal LDO is used to generate DCVDD)

3. MICVDD power supply off (If MICVDD is supplied by external power)

4. DBVDD power supply off (This step is required if DBVDD is supplied higher than 1.8V)

5. DBVDD/AVDD/DACREF/CPVDD power supply off

6. DCVDD power supply off (If DCVDD is supplied by external power)

7. SPKVDD power supply off

Multi-Channel Audio Hub/CODEC and SounzRealTM

12

Digital Sound Effect for Mobile Devices

Rev. 0.91

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