CS42L51_07 Datasheet, PDF (49/88 Pages) Cirrus Logic – Low Power, Stereo CODEC with Headphone Amp

CS42L51
6. REGISTER DESCRIPTION
All registers are read/write except for the chip I.D. and Revision Register and Interrupt Status Register which are
read only. See the following bit definition tables for bit assignment information. The default state of each bit after a
power-up sequence or reset is listed in each bit description.
All “Reserved” registers must maintain their default state.
Note: Certain functions are only available when the “Signal Processing Engine to DAC” option is selected using
the DATA_SEL[1:0] bits, as described in section “DAC Data Selection (DATA_SEL[1:0])” on page 58.
6.1 Chip I.D. and Revision Register (Address 01h) (Read Only)
7
Chip_ID4
6
Chip_ID3
5
Chip_ID2
4
Chip_ID1
3
Chip_ID0
2
Rev_ID2
1
Rev_ID1
0
Rev_ID0
Chip I.D. (Chip_ID[4:0])
Default: 11011
Function:
I.D. code for the CS42L51. Permanently set to 11011.
Chip Revision (Rev_ID[2:0])
Default: 001
Function:
CS42L51 revision level. Revision B is coded as 001. Revision A is coded as 000.
6.2 Power Control 1 (Address 02h)
7
Reserved
6
5
4
3
2
1
PDN_DACB PDN_DACA PDN_PGAB PDN_PGAA PDN_ADCB PDN_ADCA
0
PDN
Notes:
1. To activate the power-down sequence for individual channels (A or B,) both channels must first be pow-
ered down either by enabling the PDN bit or by enabling the power-down bits for both channels. En-
abling the power-down bit on an individual channel basis after the CODEC has fully powered up will
mute the selected channel without achieving any power savings.
Recommended channel power-down sequence: 1.) Enable the PDN bit, 2.) enable power-down for the se-
lect channels, 3.) disable the PDN bit.
Power Down DAC X (PDN_DACX)
Default: 0
0 - Disable
1 - Enable
Function:
DAC channel x will either enter a power-down or muted state when this bit is enabled. See Note 1 above.
DS679F1
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