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PCM2903C Datasheet(PDF) 23 Page - Texas Instruments |
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PCM2903C Datasheet(HTML) 23 Page - Texas Instruments |
23 / 31 page ![]() D+/D– SEL1 (Pin 9) 2.5 V (Typ) 0 V Internal Reset Ready for Setup Attach (Connect to USB Bus) SOF Ready for Playback Bus Reset Set Configuration SOF SOF BPZ Bus Idle 3.3 V (Typ) SSPND 700 s m Device Setup 1 ms 5 V = V (Typ) BUS V (Pin 27) DD V L V R OUT OUT First Audio Data Second Audio Data PCM2903C www.ti.com SBFS038 – JUNE 2012 INTERFACE SEQUENCE Power On, Attach, and Playback Sequence The PCM2903C is ready for setup when the reset sequence has finished and the USB bus is attached. In order to perform certain reset sequences defined in the USB specification, VDD, VCCC, VCCP1, VCCP2, and VCCX must rise up within 10 ms / 3.3 V. After connection has been established by setup, the PCM2903C is ready to accept USB audio data. While waiting, the audio data (idle state) and analog output are set to bipolar zero (BPZ). When receiving the audio data, the PCM2903C stores the first audio packet, which contained 1-ms audio data, into the internal storage buffer. The PCM2903C starts playing the audio data when detecting the next start of frame (SOF) packet, as illustrated in Figure 35 and Figure 36. Figure 35. Attach After Power On Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 23 Product Folder Link(s): PCM2903C |
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