參數(shù)資料
型號(hào)： LM4935WL
廠商： National Semiconductor Corporation
元件分類： ADC
英文描述： Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
中文描述： 音頻子系統(tǒng)的雙模單聲道立體聲耳機(jī)和揚(yáng)聲器放大器的高效率和多功能模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 61/112頁(yè)
文件大?。?/td> 5017K
代理商： LM4935WL
12.0 Status & Control Registers
(Continued)
Only the 8 MSBS [11:4] from the 12 bits of SAR output data can be read back using the I
2
C interface.
The SPI interface can be used to access all 12 bits of the SAR output data. In this case, GPIO2 should be set to SAR_SDO by
setting GPIO_SEL in register (0x1Ah). The SAR channel selected by SAR_CH_SEL in the GPIO register is then output onto
GPIO2 as follows:
In applications where the 8 MSBS [11:4] from the SAR output data is enough resolution, GPIO2 should be set to SPI_SDO by
setting GPIO_SEL in register (0x1Ah). The SAR data is then output on GPIO2 as follows:
If the user performs a write to the GPIO register the changes will not take effect until the next SPI operation so SAR data can be
read while the next channel is being selected. The SAR data is sampled at the start of the SPI transaction to ensure that the data
is stable during the read operation.
All 12 bits of the SAR output data for up to 2 SAR channels can be read back simultaneously through the bi-directional I
2
S
interface. This is accomplished by setting I2S_SDO_DATA (bit [7:6] of (0x19h)) to the desired SAR channel(s).
As mentioned previously in the
Digital Audio Data Formats
section, when SAR SDO is passed to the I
2
S bus, the SAR SDO’s
MSB is aligned with the MSB of I2S_SDO.
20134108
FIGURE 14. SPI SAR Read Transaction (GPIO2 set to SAR_SDO)
20134107
FIGURE 15. SPI SAR Read Transaction (GPIO2 set to SPI_SDO)
L
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4935WLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
LM4936 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C)
LM49360 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
LM49360RL 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
LM49360RLX 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
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