Datasheet

VS1053b Datasheet

9 FUNCTIONAL DESCRIPTION

9.6.2 SCI_STATUS (RW)

SCI_STATUS contains information on the current status of VS1053b. It also controls some

low-level things that the user does not usually have to care about.

Name Bits Description

SS_DO_NOT_JUMP 15 Header in decode, do not fast forward/rewind

SS_SWING 14:12 Set swing to +0 dB, +0.5 dB, .., or +3.5 dB

SS_VCM_OVERLOAD 11 GBUF overload indicator ’1’ = overload

SS_VCM_DISABLE 10 GBUF overload detection ’1’ = disable

9:8 reserved

SS_VER 7:4 Version

SS_APDOWN2 3 Analog driver powerdown

SS_APDOWN1 2 Analog internal powerdown

SS_AD_CLOCK 1 AD clock select, ’0’ = 6 MHz, ’1’ = 3 MHz

SS_REFERENCE_SEL 0 Reference voltage selection, ’0’ = 1.23 V, ’1’ = 1.65 V

SS_DO_NOT_JUMP is set when a WAV, Ogg Vorbis, WMA, MP4, or AAC-ADIF header is

being decoded and jumping to another location in the ﬁle is not allowed. If you use soft reset or

cancel, clear this bit yourself or it can be accidentally left set.

If AVDD is at least 3.3 V, SS_REFERENCE_SEL can be set to select 1.65 V reference voltage

to increase the analog output swing.

SS_AD_CLOCK can be set to divide the AD modulator frequency by 2 if XTALI/2 is too much.

SS_VER is 0 for VS1001, 1 for VS1011, 2 for VS1002, 3 for VS1003, 4 for VS1053 and VS8053,

5 for VS1033, 7 for VS1103, and 6 for VS1063.

SS_APDOWN2 controls analog driver powerdown. SS_APDOWN1 controls internal analog

powerdown. These bit are meant to be used by the system ﬁrmware only.

If the user wants to powerdown VS1053b with a minimum power-off transient, set SCI_VOL to

0xffff, then wait for at least a few milliseconds before activating reset.

VS1053b contains GBUF protection circuit which disconnects the GBUF driver when too much

current is drawn, indicating a short-circuit to ground. SS_VCM_OVERLOAD is high while the

overload is detected. SS_VCM_DISABLE can be set to disable the protection feature.

SS_SWING allows you to go above the 0 dB volume setting. Value 0 is normal mode, 1 gives

+0.5 dB, and 2 gives +1.0 dB. Settings from 3 to 7 cause the DAC modulator to be overdriven

and should not be used. You can use SS_SWING with I2S to control the amount of headroom.

Note: Due to a ﬁrmware bug in the VS1053b volume calculation routine clears SS_AD_CLOCK

and SS_REFERENCE_SEL bits. Write to SCI_STATUS or SCI_VOLUME, and sample rate

change (if bass enhancer or treble control are active) causes the volume calculation routine to

be called. See the VS1053b Patches w/ FLAC Decoder plugin for a workaround:

http://www.vlsi.ﬁ/en/support/software/vs10xxplugins.html

Version: 1.22, 2014-12-19 40