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LM4935RLEVAL Datasheet(PDF) 40 Page - Texas Instruments |
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LM4935RLEVAL Datasheet(HTML) 40 Page - Texas Instruments |
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40 / 91 page  0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 PCM_CLK PCM_SDO/ PCM_SDI PCM_SYNC Short frame sync mode (PCM_LONG = 0) Long frame sync mode (PCM_LONG = 1) LM4935, LM4935RLEVAL SNAS296D – OCTOBER 2005 – REVISED MARCH 2006 www.ti.com Figure 4-15. PCM Serial Data Format (16 bit Slave Example) When SAR SDO data is passed to the I2S, it is left aligned (MSB aligned) to allow lower I2S resolutions to be used. If the DAC is driven from the PCM interface then the left channel of the DAC is used and the right channel is inactive. 4.2.33 GPIO CONFIGURATION REGISTER This register is used to control the GPIO system. Table 4-32. GPIO (0x1Ah) Bits Field Description 2:0 GPIO_SEL This sets the function of the GPIOs when the Audio Interface is not using them. GPIO_SEL GPIO 1 GPIO 2 0002 0 0 0012 READABLE SPI_SDO 0102 LS_AMP_ENABLE SPI_SDO 0112 GPIO_DATA SPI_SDO 1002 0 SPI_SDO 1012 READABLE SAR_SDO 1102 LS_AMP_ENABLE SAR_SDO 1112 GPIO_DATA SAR_SDO Setting GPIO_SEL = “010” with the GPIO_TEST_MODE bit (register 0X26h) set configures the GPIOs for digital mic operation. With this setting, GPI01 will output VADC_CLK_OUT to provide a clock for the digital mic. GPIO2 will accept digital mic data. GPIO1's LS_AMP_ENABLE setting will be logic high whenever the loudspeaker amplifier is enabled. This is useful for enabling an external amplifier for stereo loudspeaker applications. 4:3 SAR_CH_SEL This field selects the SAR output channel for the 2nd (Right) I2S channel or for SAR_SDO via GPIO2. SAR_CH_SEL Selected Channel 002 VSAR_1 012 VSAR_2 102 D_VDD/2 or BB_VDD 112 A_VDD/2 5 I2S_MODE If set the I2S operates in left justified mode (sometimes referred to as DSP mode). See example below. (Note 30) 6 PCM_LONG If set the PCM interface uses LONG frame sync which is essentially an inverted short frame sync. 7 GPIO_DATA If GPIO_SEL is set to GPIO_DATA then the content of this field is passed to GPIO1 as an output. 40 Application Information Copyright © 2005–2006, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LM4935 LM4935RLEVAL |
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