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MCP2210-I-SO Datasheet(PDF) 6 Page - Microchip Technology |
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MCP2210-I-SO Datasheet(HTML) 6 Page - Microchip Technology |
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6 / 82 page  MCP2210 DS22288A-page 6 2011 Microchip Technology Inc. In order to meet the inrush current requirements of the USB 2.0 specifications, the total effective capacitance appearing across VBUS and ground must be no more than 10 µF. If it is more than 10 µF, some kind of inrush limiting is required. For more details on Inrush Current Limiting, see the current Universal Serial Bus Specifi- cation. According to the USB 2.0 specification, all USB devices must also support a Low-Power Suspend mode. In the USB Suspend mode, devices must consume no more than 500 µA (or 2.5 mA for high powered devices that are remote wake-up capable) from the 5V VBUS line of the USB cable. The host signals the USB device to enter Suspend mode by stopping all USB traffic to that device for more than 3 ms. The USB bus provides a 5V voltage. However, the USB transceiver requires 3.3V for the signaling (on D+ and D- lines). During USB Suspend mode, the D+ or D- pull-up resis- tor must remain active, which will consume some of the allowed suspend current budget (500 µA/2.5 mA). The VUSB pin is required to have an external bypass capacitor. It is recommended that the capacitor be a ceramic cap, between 0.22 and 0.47 µF. Figure 1-3 shows a circuit where the MCP2210 internal LDO is used to provide 3.3V to the USB transceiver. The voltage on the VDD affects the voltage levels onto the GP and SPI module pins (GP8-GP0, MOSI, MISO and SCK). With VDD at 5V, these pins will have a logic ‘1’ of 5V with the variations specified in Section 4.1 “DC Characteristics”. FIGURE 1-3: 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 or lower power supplies. When such an option is avail- able in the target system, MCP2210 can be powered up (VDD) from the existing power supply rail. The typi- cal connections for MCP2210 powered from 3.3V rail are shown in Figure 1-4. In this example MCP2210 has both VDD and VUSB lines tied to the 3.3V rail. These tied connections disable the internal USB transceiver LDO of the MCP2210 to regulate the power supply on VUSB pin. Another consequence is that the ‘1’ logical level on the GP and SPI pins will be at the 3.3V level, in accordance with the variations specified in Section 4.1 “DC Characteristics”. FIGURE 1-4: USING AN EXTERNALLY PROVIDED 3.3V POWER SUPPLY 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 |
Similar Part No. - MCP2210-I-SO |
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Similar Description - MCP2210-I-SO |
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