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MC34708 数据表(PDF) 89 Page - Freescale Semiconductor, Inc |
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MC34708 数据表(HTML) 89 Page - Freescale Semiconductor, Inc |
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89 / 159 page  Analog Integrated Circuit Device Data 89 Freescale Semiconductor MC34708 Functional Block Description 7.8.4 Mini/Micro USB Switch The MC34708 is able to multiplex the 5 pins to support UART and high-speed USB2.0 data communications, a mono/stereo- audio/microphone headset, or other accessories. To identify what accessory is plugged into the Mini or Micro-USB connector, the MC34708 supports various detection mechanisms, including the VBUS detection and ID detection. A highly accurate 5-bit ADC is offered to distinguish the 32 levels of ID resistance, and to identify the button pressed in a cord remote control, while an Audio Type 1 cable is attached. After identifying the accessory attached, the MC34708 configures itself to support the accessory and interrupts a host via the INT pin. The processor can evaluate what caused the interrupt via the SPI/I2C bus. The MC34708 is also able to identify some non-supported accessories, such as video cables, phone-powered devices, etc. Figure 20. USB Interface 7.8.4.1 Supplies The MC34708 provides the regulators required to power the PHY in the i.MX50, i.MX51, and i.MX53 processors, which are VUSB2 (detailed Linear Regulators (LDOs)), and VUSB. The IC also provides the 5.0 V supply for USB OTG operation. The VUSB regulator is used to supply 3.3 V to the external USB PHY. The input to the VUSB regulator can be supplied from the VBUS wire of the cable when supplied by a host (PC or Hub), or by the SWBST voltage via the VINUSB pin. The VUSB regulator is powered from the SWBST boost supply to ensure OTG current sourcing compliance through the normal discharge range of the main battery. The VUSBSEL SPI bit is used to make the selection between a host or OTG mode operation. ID VBUS VUSB VUSB2 UART USB Audio GND ID VBUS VINUSB VUSB VINUSB2 VUSB2 DP DM TXD RXD D+ D- SPKR SPKRL MIC VBUS M0 M1 MOTG Switches Switches Switches Regulator Regulator Detect Detect To/From Application Processor To/From Audio IC To/From Mini-USB Connector SWBST (5.0 V boosted supply) 3.3 V USB Analog supply BP 2.5V USB Analog supply To/from Mini-USB Connector |
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