CS3318 Datasheet, PDF (36/44 Pages) Cirrus Logic – 8-Channel Analog Volume Control

7.8 Freeze Control - Address 0Fh
7
Reserved
6
Reserved
5
Reserved
4
Reserved
3
Reserved
2
Reserved
1
Reserved
CS3318
0
Freeze
7.8.1
Freeze (Bit 7)
Default = 0
Function:
When the Freeze bit is set, the Freeze function allows modifications to the control port registers with-
out changes taking effect until Freeze bit is cleared. To make multiple changes in the Control Port
registers take effect simultaneously, set the Freeze bit, make all register changes, then clear the
Freeze bit.
7.9 Master 1 Mask - Address 10h
7
M1_Ch8M
6
M1_Ch7M
5
M1_Ch6M
4
M1_Ch5M
3
M1_Ch4M
2
M1_Ch3M
1
M1_Ch2M
0
M1_Ch1M
Each bit in this register serves as a Master 1 mask for its corresponding channel.
If a mask bit is set to ‘1’, the corresponding channel is unmasked, meaning that it will be affected by the
Master 1 volume and muting controls.
If a mask bit is set to ‘0’, the corresponding channel is masked, meaning that it will not be affected by the
Master 1 volume and muting controls.
This register defaults to FFh (all channels unmasked).
7.10 Master 1 Volume - Address 11h
7
M1_Vol7
6
M1_Vol6
5
M1_Vol5
4
M1_Vol4
3
M1_Vol3
2
M1_Vol2
1
M1_Vol1
0
M1_Vol0
7.10.1 Master 1 Volume Control (Bits 7:0)
Default = 11010010
Function:
The Master 1 volume control register allows the user to simultaneously gain or attenuate all un-
masked channels in 0.5 dB increments. The volume changes are implemented as dictated by the ZC-
Mode[1:0] and TimeOut[2:0] bits in the Device Config 2 register (see “Device Configuration 2 -
Address 0Ch” on page 34).
The value of the Master 1 volume control register is mapped to the desired 0.5 dB step Master 1 vol-
ume setting by the following equation:
Register Value = (2 × Desired Volume Setting in dB) + 210
In the equation above, “Desired Volume Setting in dB” is determined by rounding the desired ¼ dB
resolution volume setting down to ½ dB resolution.
It should be noted that input values outside the CS3318’s analog range of +22 dB to -96 dB are valid,
however, the volume of each channel will be limited to the CS3318’s analog range (see “Volume Lim-
its” on page 20).
See Table 5 on page 31 for example register settings.
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DS693F1