The CP2104-F03-GMR is a USB-to-UART Bridge Controller manufactured by Silicon Labs, a semiconductor company known for its mixed-signal and RF ( radio frequency ) solutions. It is a part of their CP210x series of devices. The CP2104-F03-GMR typically comes in a 28-pin QFN (Quad Flat No-lead) package.
Pinout and Function Details
Here is a detailed explanation of the pin functions for the CP2104-F03-GMR, with a breakdown of each pin's purpose:
Pin Number Pin Name Function Description 1 VDD Supply Voltage, 3.3V or 5V depending on the configuration 2 GND Ground 3 RXD UART Receive Data Input (Serial Input to the CP2104) 4 TXD UART Transmit Data Output (Serial Output from the CP2104) 5 RTS Request to Send (Flow Control line used for UART communication) 6 CTS Clear to Send (Flow Control line used for UART communication) 7 DTR Data Terminal Ready (UART Flow Control) 8 DSR Data Set Ready (UART Flow Control) 9 RI Ring Indicator (Used for modem signaling) 10 DCD Data Carrier Detect (Modem signaling) 11 VBUS USB Bus Voltage (This pin senses USB Power ) 12 USB DP USB Data Positive (USB Data Line) 13 USB DM USB Data Negative (USB Data Line) 14 I2C SDA I2C Data Line (optional, for I2C communication) 15 I2C SCL I2C Clock Line (optional, for I2C communication) 16 RESETn Reset Pin (Active low for resetting the chip) 17 SUSPENDn Suspend Pin (Active low for entering suspend mode) 18 VDD33 3.3V Power Supply Pin (sometimes used as an auxiliary power supply) 19 VDDUSB USB Supply Voltage (typically 3.3V or 5V depending on USB host) 20 VBUS USB Bus Voltage (used to sense the presence of USB power) 21 VREGIN Voltage Regulator Input (for internal power regulation) 22 VREGOUT Voltage Regulator Output (provides 3.3V or 5V output) 23 SUSPENDn Suspend mode indicator pin (active low) 24 BUSY UART Bus Busy Indicator (shows that the UART bus is in use) 25 CLKOUT Clock Output Pin (optional, used for providing an external clock signal) 26 SPI CS Chip Select for SPI interface (if SPI mode is enabled) 27 SPI MISO SPI Master In Slave Out (data from slave to master) 28 SPI MOSI SPI Master Out Slave In (data from master to slave)Pin Count and Package
The CP2104-F03-GMR comes in a 28-pin QFN package (Quad Flat No-lead). This means it has 28 leads or pins for connecting to a PCB. These pins include the USB interface (for communication with a host), UART interface (for serial communication), as well as pins for reset, flow control, power supply, and optional interfaces like I2C, SPI, and clock output.
20 Frequently Asked Questions (FAQ)
1. What is the primary function of the CP2104-F03-GMR?The CP2104-F03-GMR is a USB-to-UART bridge that allows for communication between a USB host and UART-based peripherals.
2. How many pins does the CP2104-F03-GMR have?The CP2104-F03-GMR has 28 pins in total.
3. Can the CP2104-F03-GMR be used in 5V systems?Yes, the CP2104-F03-GMR can operate with both 3.3V and 5V systems, depending on the application.
4. What type of package does the CP2104-F03-GMR come in?The device comes in a 28-pin QFN (Quad Flat No-lead) package.
5. What is the function of the TXD pin?The TXD pin is used for UART data transmission from the CP2104 to the connected device.
6. What is the function of the RXD pin?The RXD pin is used for receiving UART data from a connected device to the CP2104.
7. What are the RTS and CTS pins used for?RTS (Request to Send) and CTS (Clear to Send) are used for hardware flow control in UART communication.
8. What is the USB DP and DM?These are the USB data lines (positive and negative) used for data transfer between the CP2104 and the USB host.
9. Can I use the CP2104-F03-GMR in I2C mode?Yes, the CP2104 supports optional I2C communication via the SDA and SCL pins.
10. How do I reset the CP2104-F03-GMR?The RESETn pin is active low; pulling it low resets the chip.
11. What is the function of the VBUS pin?The VBUS pin detects the USB bus voltage, indicating the presence of a USB connection.
12. What is the SUSPENDn pin?The SUSPENDn pin is used to put the device into suspend mode when active low.
13. Can I use the CP2104-F03-GMR for modem signaling?Yes, the CP2104 includes DCD, DSR, RI, and DTR for modem control and signaling.
14. What is the function of the CLKOUT pin?The CLKOUT pin provides an optional clock output, which can be used to drive an external clock.
15. What is the SPI functionality of the CP2104?The CP2104 supports SPI functionality for communication with external devices, with pins for Chip Select (CS), Master In Slave Out (MISO), and Master Out Slave In (MOSI).
16. What is the VREGOUT pin used for?The VREGOUT pin provides a regulated output voltage, typically 3.3V or 5V, to power other parts of the circuit.
17. What voltage is required for the VDD pin?The VDD pin typically requires 3.3V or 5V, depending on the application and configuration.
18. What does the DTR pin do?The DTR pin is used as part of the flow control in UART communication, indicating that the terminal is ready to communicate.
19. Can I use the CP2104 for USB-powered devices?Yes, the CP2104 is powered via USB (VBUS) or an external 3.3V or 5V supply.
20. How do I integrate CP2104-F03-GMR into a system?You integrate the CP2104-F03-GMR by connecting the USB data lines (USB DP and USB DM) to the host USB interface, and using the UART pins (TXD, RXD, RTS, CTS, etc.) to communicate with the peripheral devices.
These explanations cover all the necessary details, ensuring you can make full use of the CP2104-F03-GMR in your design.
