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# [FAQ] TAS2563: Adjusting Digital Volume Control using I2C

Part Number: TAS2563

What is the I2C address to change the digital volume control for playback?

• The I2C addresses for digital volume control is called DVC_PCM. Since digital control is 32 bits, DVC_PCM takes 4 registers(address 0x0C - 0x0F) in total with the first one located in Book 0, Page 2, in register 0x0C.
• DVC_Slew is the register that controls the rate at which volume changes. In similar format, the first register is located in Book 0, Page 2, in register 0x10.
• DVC_Slew =  round(exp(-1/(0.2*fs*time in seconds))*2^31)

How can I adjust the volume?

• To adjust the volume, first you need to convert the volume in dB to decimal.
• Ratio(decimal)  = round(10^(gain/20)  * 2^30)
• Then convert the Ratio in decimal to HEX
• For example: -3dB -> 2d 4e fb d6

• Write the HEX  (32 bits) to DVC_PCM1 - DVC_PCM4
• Example I2C command:
• ```w 98 00 00
w 98 7f 00
w 98 00 02
w 98 0c 2d 4e fb d6
```