CS3318 Cirrus Logic, Inc., CS3318 Datasheet - Page 31

• Manufacturer Part Number: CS3318
• Description: 8-Channel Analog Volume Control
• Manufacturer: Cirrus Logic, Inc.

DS693F1
7. CS3318 REGISTER DESCRIPTIONS
Notes:
7.1
7.1.1
Vol7
7
1. When addressing the CS3318 with the Individual Chip Address, all registers are read/write in I²C Mode
2. When addressing the CS3318 with the Group Chip Addresses, all registers are write-only in both I²C
Ch 1-8 Volume - Addresses 01h - 08h
Volume Control (Bits 7:0)
Default = 11010010
Function:
and write-only in SPI Mode, unless otherwise noted.
and SPI Mode.
The individual volume control registers allow the user to gain or attenuate the respective channels in
0.5 dB increments. The volume changes are implemented as dictated by the ZCMode[1:0] and Tim-
eOut[2:0] bits in the Device Config 2 register (see
page
The value of the Volume Control register is mapped to the desired 0.5 dB step volume setting by the
following equation:
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
its” on page
Vol6
34).
6
* QuarterX = ‘0’. See “¼ dB Control (Bit 0 - 7)” on page 32.
20).
Vol5
Register Value
5
Register Setting
00010100
00010010
11010100
11010011
11010010
11010001
11010000
00010011
11111101
11111100
11111110
-
-
Vol4
Table 5. Example Volume Settings
4
=
(
2
×
Desired Volume Setting in dB
Vol3
3
“Device Configuration 2 - Address 0Ch” on
Gain or Attenuation (dB)*
Vol2
2
+21.5
-95.5
+0.5
+22
+21
-0.5
-95
-96
+1
-1
0
-
-
)
+
210
Vol1
1
“Volume Lim-
CS3318
Vol0
0
31