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MCP2210T-I-SS bảng dữ liệu(HTML) 5 Page - Microchip Technology |
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5 / 82 page  2011 Microchip Technology Inc. DS22288A-page 5 MCP2210 1.5 USB Transceiver The MCP2210 has a built-in, USB 2.0, full-speed transceiver internally connected to the USB module. The USB transceiver obtains power from the VUSB pin, which is internally connected to a 3.3V internal regulator. The best electrical signal quality is obtained when VUSB is locally bypassed with a high-quality ceramic capacitor. The internal 3.3V regulator draws power from the VDD pin. In certain scenarios, where VDD is lower than 3.3V+ internal LDO dropout, the VUSB pin must be tied to an external regulated 3.3V. This will allow the USB transceiver to work correctly, while the I/O voltage in the rest of the system can be lower than 3.3V. As an example, in a system where the MCP2210 is used and the I/O required is of 2.2V, the VDD of the chip will be tied to the 2.2V digital power rail, while the VUSB pin must be connected to a regulated 3.3V power supply. 1.5.1 INTERNAL PULL-UP RESISTORS The MCP2210 device has built-in pull-up resistors designed to meet the requirements for full-speed USB. 1.5.2 MCP2210 POWER OPTIONS The following are the main power options for the MCP2210: • USB Bus Powered (5V) • Self Powered (from 3.3V to 5V), while the VUSB pin is supplied with 3.3V (regulated). If the VDD is powered with 5V, then the VUSB will be powered by the internal regulator and the VUSB pin will need only a decoupling capacitor 1.5.2.1 Internal Power Supply Details MCP2210 offers various options for power supply. To meet the required USB signaling levels, MCP2210 device incorporates an internal LDO used solely by the USB transceiver, in order to present the correct D+/D voltage levels. Figure 1-1 shows the internal connections of the USB transceiver LDO in relation with the VDD power supply rail. The output of the USB transceiver LDO is tied to the VUSB line. A capacitor connected to the VUSB pin is required if the USB transceiver LDO provides the 3.3V supply to the transceiver. FIGURE 1-1: MCP2210 INTERNAL POWER SUPPLY DETAILS The provided VDD voltage has a direct influence on the voltage levels present on the GPIO and SPI module pins (GP8-GP0, MOSI, MISO and SCK). When VDD is 5V, all of these pins will have a logical ‘1’ around 5V with the variations specified in Section 4.1 “DC Char- acteristics”. For applications that require a 3.3V logical ‘1’ level, VDD must be connected to a power supply providing the 3.3V voltage. In this case, the internal USB transceiver LDO cannot provide the required 3.3V power. It is necessary to also connect the VUSB pin of the MCP2210 to the 3.3V power supply rail. This way, the USB transceiver is powered up directly from the 3.3V power supply. 1.5.2.2 USB Bus Powered (5V) In Bus Power Only mode, the entire power for the application is drawn from the USB (see Figure 1-2). This is effectively the simplest power method for the device. FIGURE 1-2: BUS POWER ONLY LDO 3.3V USB Transceiver D+ VDD VUSB D- IN OUT VDD VUSB VSS VBUS |
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