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MCP2200-IMQ Datasheet(PDF) 8 Page - Microchip Technology |
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MCP2200-IMQ Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 44 page  MCP2200 DS22228B-page 8 2011 Microchip Technology Inc. 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. 1.7 EEPROM Module The EEPROM module is a 256 byte array of nonvolatile memory. The memory locations are accessed for read/write operations via USB host commands. Refer to Section 2.0 “Configuration” for details on access- ing the EEPROM. The memory cells for data EEPROM are rated to endure thousands of erase/write cycles, up to 100K for EEPROM. Data retention without refresh is conservatively estimated to be greater than 40 years. The host should wait for the write cycle to complete and then verify the write by reading the byte(s). 1.8 RESET/POR 1.8.1 RESET PIN The RST pin provides a method for triggering an external Reset of the device. A Reset is generated by holding the pin low. These devices have a noise filter in the Reset path which detects and ignores small pulses. 1.8.2 POR A POR pulse is generated on-chip whenever VDD rises above a certain threshold. This allows the device to start in the initialized state when VDD is adequate for operation. To take advantage of the POR circuitry, tie the RST pin through a resistor (1 kOhm to 10 kOhm) to VDD. This will eliminate external RC components usually needed to create a POR delay. When the device starts normal operation (i.e., exits the Reset condition), device operating parameters (voltage, frequency, temperature, etc.) must be met to ensure operation. If these conditions are not achieved, the device must be held in Reset until the operating conditions are met. 1.9 Oscillator The input clock must be 12 MHz to provide the proper frequency for the USB module. USB full-speed is nominally 12 Mb/s. The clock input accuracy is ±0.25% (2,500 ppm maximum). FIGURE 1-6: QUARTZ CRYSTAL OPERATION FIGURE 1-7: CERAMIC RESONATOR OPERATION Quartz Crystal 12 MHz OSC1 OSC2 RS(1) RF(2) MCP2200 Note 1: A series resistor (RS) may be required for quartz crystals with high drive level. 2: The value of RF is typically between 2M to 10 M.. Example: muRata CSTCE12M0G15L OSC1 OSC2 Resonator 12 MHz MCP2200 |
Similar Part No. - MCP2200-IMQ |
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Similar Description - MCP2200-IMQ |
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