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MCP2200 bảng dữ liệu(PDF) 7 Page - Microchip Technology |
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MCP2200 bảng dữ liệu(HTML) 7 Page - Microchip Technology |
7 / 44 page 2011 Microchip Technology Inc. DS22228B-page 7 MCP2200 FIGURE 1-4: TYPICAL POWER SUPPLY OPTION USING THE 5V PROVIDED BY THE USB 1.5.2.3 3.3V Self Powered Typically, many embedded applications are using 3.3V power supplies. When such an option is available in the target system, MCP2200 can be powered up from the existing 3.3V power supply rail. The typical connections for MCP2200 are shown in Figure 1-5. In this example MCP2200 has both VDD and VUSB lines tied to the 3.3V rail. These tied connections disable the internal USB transceiver LDO of the MCP2200 to reg- ulate the power supply on VUSB pin. Another conse- quence is that the ‘1’ logical level on the GPIO pins will be at the 3.3V level, in accordance with the variations specified in Section 3.1, DC Characteristics. FIGURE 1-5: USING AN EXTERNALLY PROVIDED 3.3V POWER SUPPLY 1.6 GPIO Module The GPIO Module is a standard 8-bit I/O port. 1.6.1 CONFIGURABLE PIN FUNCTIONS The pins can be configured as: • GPIO – individually configurable general purpose input or output • SSPND – USB Suspend state • USBCFG – indicates USB configuration status • RxLED – indicates USB receive traffic • TxLED – indicates USB transmit traffic 1.6.1.1 SSPND Pin Function The SSPND pin (if enabled) reflects the USB state (Suspend/Resume). The pin is active ‘low’ when the Suspend state has been issued by the USB host. Likewise, the pin drives ‘high’ after the Resume state is achieved. This pin allows the application to go into Low Power mode when USB communication is suspended, and switches to a full active state when USB activity is resumed. 1.6.1.2 USBCFG Pin Function The USBCFG pin (if enabled) starts out ‘low’ during power-up or after Reset, and goes ‘high’ after the device successfully configures to the USB. The pin will go ‘low’ when in Suspend mode and ‘high’ when the USB resumes. LDO 3.3V USB Transceiver D+ VDD VUSB D- IN OUT 5V (USB Bus) or external power supply LDO 3.3V D+ VDD VUSB D- IN OUT 5V (USB Bus) or external power supply External USB Transceiver 3.3V LDO |
Số phần tương tự - MCP2200_11 |
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Mô tả tương tự - MCP2200_11 |
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