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MCP2200 Datasheet(PDF) 5 Page - Microchip Technology |
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MCP2200 Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 44 page  2011 Microchip Technology Inc. DS22228B-page 5 MCP2200 EQUATION 1-1: SOLVING FOR ACTUAL BAUD RATE 1.3.3 CUSTOM BAUD RATES Custom baud rates are configured by sending the SET_LINE_CODING USB command, or by using the DLL. See Section 2.0 “Configuration” for more information. 1.3.4 HARDWARE FLOW CONTROL Hardware flow control uses the RTS and CTS pins as a handshake between two devices. The RTS pin of one device is typically connected to the CTS of the other device. RTS is an active low output that notifies the other device when it is ready to receive data by driving the pin low. The MCP2200 trip point for de-asserting RTS (high) is 63 characters. This is one character short of “buffer full”. CTS is an active low input that notifies the MCP2200 when it is ready to send data. The MCP2200 will check CTS just before loading and sending UART data. If the pin is asserted during a transfer, the transfer will con- tinue. Refer to Figure 1.4. FIGURE 1-1: RTS/CTS CONNECTIONS EXAMPLE 1.3.4.1 Flow Control Disabled The buffer pointer does not increment (or reset to zero) if the buffer is full. Therefore, if hardware flow control is not enabled and an overflow occurs (i.e., 65 unprocessed characters received), the new data overwrites the last position in the buffer. 1.4 USB Protocol Controller The USB controller in the MCP2200 is full-speed USB 2.0 compliant. • Composite device (CDC + HID): - CDC: USB-to-UART communications - HID: I/O control, EEPROM access and initial configuration • 128 byte buffer to handle data throughput at any UART baud rate: - 64-byte transmit -64-byte receive • Fully configurable VID and PID assignments, and descriptors (stored on-chip) • Bus powered or self-powered 1.4.1 DESCRIPTORS During configuration, the supplied PC interface stores the descriptors in the MCP2200. 1.4.2 SUSPEND AND RESUME The USB Suspend and Resume signals are supported for power management of the MCP2200. The device enters Suspend mode when “suspend signaling” is detected on the bus. The MCP2200 exits Suspend mode when any of the following events occur: 1. “Resume signaling” is detected or generated 2. A USB “Reset” signal is detected 3. A device Reset occurs 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. 1.5.2 MCP2200 POWER OPTIONS The following are the main power options for the MCP2200: • USB Bus Powered (5V) • 3.3V Self Powered ActualRate 12MHz int x ------------------- = Where: x 12MHz DesiredBaud ----------------------------------- = RTS RTS CTS CTS I am ready to receive I’ll transmit if okay I am ready to receive I’ll transmit if okay MCU MCP2200 |
Similar Part No. - MCP2200_13 |
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Similar Description - MCP2200_13 |
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