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MCP2200-I/SO bảng dữ liệu(PDF) 6 Page - Microchip Technology |
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MCP2200-I/SO bảng dữ liệu(HTML) 6 Page - Microchip Technology |
6 / 34 page MCP2200 DS22228A-page 6 2010 Microchip Technology Inc. 1.5 USB Transceiver The MCP2200 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 the 3.3V regulator. The best electrical signal quality is obtained when VUSB is locally bypassed with a high quality ceramic capacitor. 1.5.1 INTERNAL PULL-UP RESISTORS The MCP2200 devices have built-in pull-up resistors designed to meet the requirements for full-speed USB. 1.5.1.1 Bus Power Only In Bus Power Only mode, all power for the application is drawn from the USB (Figure 1-2). This is effectively the simplest power method for the device. 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 not, some kind of inrush limiting is required. For more details, see Section 7.2.4 of the “Universal Serial Bus Specification”. 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. During USB Suspend mode, the D+ or D- pull-up resistor must remain active, which will consume some of the allowed suspend current budget (500 µA/ 2.5 mA). FIGURE 1-2: BUS POWER ONLY 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. 1.6.1.3 RxLED Pin Function (IN Message) The ‘Rx’ in the pin name is in respect to the USB host. The RxLED pin is an indicator for USB ‘IN’ messages. This pin will either pulse low for a period of time (configurable for ~100 ms or ~200 ms), or toggle to the opposite state for every message received (IN message) by the USB host. This allows the application to count messages or provide a visual indication of USB traffic. 1.6.1.4 TxLED Pin Function (OUT Message) The ‘Tx’ in the pin name is in respect to the USB host. The TxLED pin is an indicator for USB ‘OUT’ messages. This pin will either pulse low for a period of time (configurable for ~100 ms or ~200 ms), or toggle to the opposite state for every message transmitted (OUT message) by the USB host. This allows the application to count messages or provide a visual indication of USB traffic. VDD VUSB VSS VBUS |
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