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USB334X 数据表(PDF) 74 Page - Microchip Technology |
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USB334X 数据表(HTML) 74 Page - Microchip Technology |
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74 / 92 page  USB334x DS00002646A-page 74 2009-2018 Microchip Technology Inc. 7.1.3.3 Headset Audio Mode Address = 33h (read / write) 7.1.3.4 Vendor Rid Conversion Address = 36-38h (read), 36h (write), 37h (set), 38h (clear) VdatDet 4rd 0 VDAT_DET Comparator output. IdatSinkEn must be set to 1 to enable the comparator. 0b: No voltage is detected on DP or Linestate[1:0] is not equal to 00b. 1b: Voltage detected on DP, and Linestate[1:0] = 00b. Note: VdatDet can also be read from the Carkit Interrupt Status register described in Section 7.1.2.3, "Carkit Interrupt Status," on page 71. Reserved 5-7 rd Read only, 0. Note: The charger detection should be turned off before beginning USB operation. USB-IF Charger Detection Bits 2:0 should be set to 000b. Field Name Bit Access Default Description HeadsetAudioEn 3:0 rd/w 0000b When this field is set to a value of ‘1010’, the Head- set Audio Mode is enabled as described in Section 6.8.1, "Headset Audio Mode," on page 61. Reserved 7:4 rd 0h Read only, 0. Field Name Bit Access Default Description RidValue 2:0 rd/w 000b Conversion value of Rid resistor 000: 0Ω 001: 75Ω 010: 100 KΩ 011: 200 KΩ 100: 440 KΩ 101: ID floating 111: Error Note: RidValue can also be read from the Carkit Interrupt Status Register. RidConversionDone 3rd (Note 7-4) 0b Automatically asserted by the USB334x when the Rid Conversion is finished. The conversion will take 282uS. This bit will auto clear when the RidValue is read from the Rid Conversion Register. Reading the RidValue from the Carkit Interrupt Status Register will not clear either RidConversionDone status bit. Note: RidConversionDone can also be read from the Carkit Interrupt Status Register. Field Name Bit Access Default Description |
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