The CP2104-F03-GM is a product from Silicon Labs, specifically from their CP210x series of USB-to-UART bridge controllers.
Pinout and Package Information
The CP2104 typically comes in a QFN-28 (Quad Flat No-lead) package. This package has 28 pins, which are organized in a compact form with no leads protruding from the body. Below is a breakdown of the CP2104's pinout.
Pin Function Table
Here’s a detailed explanation of the pin functions for the CP2104-F03-GM package (28 pins):
Pin Number Pin Name Pin Type Pin Function Description 1 VDD Power Supply Power input for the CP2104. This pin should be connected to the 3.3V supply voltage. 2 GND Ground Ground pin for the CP2104. It should be connected to the ground of the power supply. 3 TXD Digital Output Transmit Data pin, used to send data from the CP2104 to a UART receiver (typically connected to an external microcontroller). 4 RXD Digital Input Receive Data pin, used to receive data from an external UART transmitter (typically from a microcontroller). 5 RTS Digital Input/Output Request to Send pin used for flow control in UART communication. Can be configured as an input or output. 6 CTS Digital Output/Input Clear to Send pin used for UART flow control. Can also be configured as an input or output. 7 DTR Digital Output Data Terminal Ready pin, used to indicate that the CP2104 is ready to communicate (output to modem or external device). 8 DSR Digital Input Data Set Ready pin, used by external devices to indicate readiness for communication (input from modem or external device). 9 RI Digital Input Ring Indicator pin used in communication systems to indicate that a ring signal (telephone) is present. 10 DCD Digital Input Data Carrier Detect pin used to indicate a valid carrier signal in modem communication. 11 VDDIO Power Supply Provides supply voltage to the I/O logic circuits, typically 3.3V or 5V depending on system requirements. 12 NC No Connect No connection, unused pin. 13 NC No Connect No connection, unused pin. 14 SUSPEND Digital Input Suspend input for controlling USB suspend mode, useful for power management. 15 USB_DP USB Data+ USB data line for USB communications. 16 USB_DM USB Data- USB data line for USB communications. 17 GPIO0 Digital Input/Output General Purpose Input/Output pin 0, can be used for custom signaling (configurable as input or output). 18 GPIO1 Digital Input/Output General Purpose Input/Output pin 1, can be used for custom signaling (configurable as input or output). 19 GPIO2 Digital Input/Output General Purpose Input/Output pin 2, can be used for custom signaling (configurable as input or output). 20 GPIO3 Digital Input/Output General Purpose Input/Output pin 3, can be used for custom signaling (configurable as input or output). 21 GPIO4 Digital Input/Output General Purpose Input/Output pin 4, can be used for custom signaling (configurable as input or output). 22 GPIO5 Digital Input/Output General Purpose Input/Output pin 5, can be used for custom signaling (configurable as input or output). 23 GPIO6 Digital Input/Output General Purpose Input/Output pin 6, can be used for custom signaling (configurable as input or output). 24 GPIO7 Digital Input/Output General Purpose Input/Output pin 7, can be used for custom signaling (configurable as input or output). 25 GPIO8 Digital Input/Output General Purpose Input/Output pin 8, can be used for custom signaling (configurable as input or output). 26 GPIO9 Digital Input/Output General Purpose Input/Output pin 9, can be used for custom signaling (configurable as input or output). 27 GPIO10 Digital Input/Output General Purpose Input/Output pin 10, can be used for custom signaling (configurable as input or output). 28 GPIO11 Digital Input/Output General Purpose Input/Output pin 11, can be used for custom signaling (configurable as input or output).20 FAQ for CP2104-F03-GM
1. Q: What is the CP2104-F03-GM used for?A: The CP2104-F03-GM is a USB-to-UART bridge, allowing for serial communication over USB. It converts USB signals into UART (RS232/TTL) signals.
2. Q: What is the typical application of the CP2104-F03-GM?A: It is commonly used in applications requiring USB communication with microcontrollers, sensors, and other devices that utilize UART.
3. Q: How do I connect the CP2104 to a microcontroller?A: Connect the TXD pin to the RXD pin of the microcontroller and the RXD pin to the TXD pin of the microcontroller.
4. Q: How do I provide power to the CP2104?A: The VDD pin should be connected to a 3.3V supply, while the GND pin should be connected to ground.
5. Q: Can I use the CP2104 in a 5V system?A: Yes, the CP2104 can operate at 5V levels if configured appropriately, but ensure the logic levels are compatible with your system's voltage requirements.
6. Q: How do I configure flow control for UART communication?A: You can configure RTS and CTS pins for hardware flow control, while DTR and DSR can be used for controlling communication readiness.
7. Q: What is the significance of the USBDP and USBDM pins?A: These pins are used for differential data transfer in USB communications, with USBDP being the positive line and USBDM the negative line.
8. Q: Is the CP2104 capable of bidirectional communication?A: Yes, UART communication via the TXD and RXD pins allows bidirectional data transmission between devices.
9. Q: How do I use the GPIO pins?A: GPIO pins can be configured as input or output depending on your application. They are useful for custom signaling or controlling peripherals.
10. Q: What happens if I leave unused pins floating?A: Unused pins like NC (no connection) can be left floating, but it is recommended to leave them unconnected to avoid potential interference.
11. Q: How does the CP2104 handle suspend mode?A: The SUSPEND pin can be used to put the CP2104 into low-power suspend mode when the USB host enters suspend mode.
12. Q: Can I use the CP2104 for 1.8V logic level systems?A: The CP2104 operates at 3.3V, and using it with 1.8V logic levels would require level-shifting components for compatibility.
13. Q: Does the CP2104 support USB 2.0?A: Yes, the CP2104 supports USB 2.0 full-speed communication (12 Mbps).
14. Q: What is the maximum data rate of the CP2104?A: The CP2104 can handle UART communication speeds up to 1 Mbps.
15. Q: Can I configure the CP2104 for different baud rates?A: Yes, the CP2104 allows you to configure different baud rates through the software drivers.
16. Q: What is the role of the DCD pin in communication?A: The DCD pin signals whether the modem has detected a carrier signal, which is used to indicate a valid communication link.
17. Q: Does the CP2104 require external drivers?A: Yes, the CP2104 requires specific drivers from Silicon Labs for communication with the computer.
18. Q: How do I handle error handling in UART communication with the CP2104?A: The CP2104 provides error signaling over the UART lines and can handle framing, parity, and buffer overflow errors.
19. Q: Can I control the CP2104's behavior programmatically?A: Yes, the CP2104’s behavior, including GPIO configurations and UART parameters, can be controlled using appropriate software libraries and drivers.
20. Q: How do I interface with the CP2104 using a microcontroller?A: You can interface with the CP2104 through the TXD/RXD pins for UART data transfer, and configure its flow control and GPIO pins as needed.