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TAS5705PAPR 데이터시트(PDF) 51 Page - Texas Instruments |
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TAS5705PAPR 데이터시트(HTML) 51 Page - Texas Instruments |
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51 / 71 page ![]() SERIAL DATA INTERFACE REGISTER (0x04) SYSTEM CONTROL REGISTER 2 (0x05) TAS5705 www.ti.com ...................................................................................................................................................................................................... SLOS549 – JUNE 2008 The TAS5705 supports the serial data modes shown in Table 12. The default is 24-bit, I2S mode. Table 12. Serial Data Interface Control Register (0x04) Format RECEIVE SERIAL DATA WORD D7–D5 D4 D3 D2 D1 D0 INTERFACE FORMAT LENGTH Right-justified 16 000 0 0 0 0 0 Right-justified 20 000 0 0 0 0 1 Right-justified 24 000 0 0 0 1 0 I2S 16 000 0 0 0 1 1 I2S 20 000 0 0 1 0 0 I2S (1) 24 000 0 0 1 0 1 Left-justified 16 000 0 0 1 1 0 Left-justified 20 000 0 0 1 1 1 Left-justified 24 000 0 1 0 0 0 Reserved 000 0 1 0 0 1 Right-justified 18 000 0 1 0 1 0 Reserved 000 0 1 0 1 1 Reserved 000 0 1 1 0 0 Reserved 000 0 1 1 0 1 Reserved 000 0 1 1 1 0 Reserved 000 0 1 1 1 1 Reserved 000 1 0 0 0 0 I2S (32 fS SCLK) 16 000 1 0 0 1 1 Left-justified (32 fS SCLK) 000 1 0 1 1 0 Reserved 000 1 1 0 0 1 Reserved 000 1 1 0 1 1 Reserved 000 1 1 1 0 1 (1) Default values are in bold. Bit D6 is a control bit and bit D5 is a configuration bit. When bit D6 is set low, the system starts playing; otherwise, the outputs are shut down. Bit D5 defines the configuration of the system, that is, it determines what configuration the system runs in when bit D6 is set low. When this bit is asserted, all channels are switching. Otherwise, only a subset of the PWM channels run. The channels to shut down are defined in the shutdown group register (0x19). Bit D5 should only be changed when bit D6 is set, meaning that it is only possible to switch configurations by resetting the DAP and then restarting it again in the new configuration. Bit D3 defines which volume register is used to control the volume of the HP_PWMx outputs when in headphone mode. When set to 0, the HP volume register (0x0C) controls the volume of the headphone outputs when in headphone mode. When bit D3 is set to 1, the channel volume registers (0x08–0x0B, 0x0D) are used for all modes (line out, headphone, speaker). Bits D2–D1 define the output modes. The default is speaker mode with the headphone mode selectable via the external HPSEL terminal. The device can also be forced into headphone mode by asserting bit D1 (all other PWM channels are muted). Asserting bit D2 puts the device into a pseudo-line-out mode where the HP_PWMx and all other PWM channels are active. Bit D3 must also be asserted in this mode, and the HP_PWMx volume is controlled with the main speaker output volume controls via registers 0x08–0x0B and 0x0D. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 51 Product Folder Link(s): TAS5705 |
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