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83C51SND2C-JL 参数 Datasheet PDF下载

83C51SND2C-JL图片预览
型号: 83C51SND2C-JL
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片闪存微控制器与MP3解码器,支持完整的音频接口 [Single-Chip Flash Microcontroller with MP3 Decoder with Full Audio Interface]
分类和应用: 解码器闪存微控制器
文件页数/大小: 235 页 / 2877 K
品牌: ATMEL [ ATMEL ]
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Example Start I2S  
Start DCLK.  
RSTMASK=1.  
RESFILZ=0 and RSTZ=0.  
RESFILZ=1 and RSTZ=1.  
RSTMASK=0.  
Delay 5 ms.  
ONDACL=1 and ONDACR=1.  
Program all DAC settings: audio format, gains...  
Example Stop I2S:  
DAC off: ONDACL=0 and ONDACR=0.  
Stop I2S and DLCK.  
Audio PA Sequence  
PA Power-On Sequence  
To avoid an audible ‘click’ at start-up, the input capacitors have to be pre-charged  
before the Power Amplifier.  
PA Power-Off Sequence  
To avoid an audible ‘click’ at power-off, the gain should be set to the minimum gain (-  
22dB) before setting the Power Amplifier.  
Precharge Control  
The power up of the circuit can be performed independently for several blocks. The  
sequence flow starts by setting to High the block specific fastcharge control bit and sub-  
sequently the associated power control bit. Once the power control bit is set to High, the  
fast charging starts. This action begins a user controlled fastcharge cycle. When the  
fastcharge period is over, the user must reset the associated fastcharge bit and the  
block is ready for use. If a power control bit is cleared a new power up sequence is  
needed.  
The several blocks with independent power control are identified in Table 118. The table  
describes the power on control and fastcharge bits for each block.  
Table 118. Precharge and Power Control  
Powered up block  
Power on control bit  
Precharge Control Bit  
PRCHARGE  
(reg 12; bit 1)  
Vref & Vcm generator  
ONMSTR  
Left line in amplifier  
Right line in amplifier  
Left line out amplifier  
Right line out amplifier  
Left D-to-A converter  
Right D-to-A converter  
Auxiliary input amplifier  
PA Driver output  
ONLNIL  
ONLNIR  
PRCHARGELNIL  
PRCHARGELNIR  
PRCHARGELNOL  
PRCHARGELNOR  
Not needed  
ONLNOL  
ONLNOR  
ONDACL  
ONDACR  
ONAUXIN  
ONPADRV  
Not needed  
PRCHARGEAUXIN  
PRCHARGEPADRV  
Note:  
Note that all block can be precharged simultaneously.  
100  
AT8xC51SND2C  
4341D–MP3–04/05  
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