The RTL8211FI-CG is a model of Ethernet transceiver chip designed by Realtek Semiconductor. This chip is primarily used for connecting devices to a local area network (LAN) via Ethernet, providing features such as support for 10/100/1000 Mbps speeds and compatibility with various networking standards. The model name signifies its configuration, with the "FI" denoting a specific product variant, and "CG" usually referring to a particular packaging type, likely related to its environmental specifications.
Packaging and Pinout
The RTL8211FI-CG typically comes in a QFN (Quad Flat No-lead) package, which is a surface-mount package with leads underneath, and it can have various pin counts. However, for the RTL8211FI-CG, the most common package is 48 pins in a QFN-48 form factor.
Pinout List
Here is a detai LED description of the pins for the RTL8211FI-CG in a QFN-48 package:
Pin No. Pin Name Pin Type Description 1 GND Ground Ground connection for the device. 2 VDD33 Power 3.3V power supply input. 3 VDD25 Power 2.5V power supply input. 4 TX0+ Output Differential transmit data signal, positive polarity. 5 TX0- Output Differential transmit data signal, negative polarity. 6 TX1+ Output Differential transmit data signal, positive polarity. 7 TX1- Output Differential transmit data signal, negative polarity. 8 TX2+ Output Differential transmit data signal, positive polarity. 9 TX2- Output Differential transmit data signal, negative polarity. 10 TX3+ Output Differential transmit data signal, positive polarity. 11 TX3- Output Differential transmit data signal, negative polarity. 12 RX0+ Input Differential receive data signal, positive polarity. 13 RX0- Input Differential receive data signal, negative polarity. 14 RX1+ Input Differential receive data signal, positive polarity. 15 RX1- Input Differential receive data signal, negative polarity. 16 RX2+ Input Differential receive data signal, positive polarity. 17 RX2- Input Differential receive data signal, negative polarity. 18 RX3+ Input Differential receive data signal, positive polarity. 19 RX3- Input Differential receive data signal, negative polarity. 20 MII_MDIO Input/Output Management Data Input/Output (for Ethernet management). 21 MII_MDC Input Management Data Clock (for Ethernet management). 22 RESET Input Reset pin for the device. Low active. 23 INT Output Interrupt signal output to notify external systems. 24 RX_ER Input Receive Error, indicates error in reception. 25 LED_LINK Output Link status LED. High indicates a valid link is established. 26 LED_SPEED Output Speed LED. Indicates the current speed of the Ethernet connection (10/100/1000 Mbps). 27 AVDD33 Power 3.3V power input (analog section). 28 AVDD25 Power 2.5V power input (analog section). 29 PWDN Input Power-down control pin. Low puts the device into low-power mode. 30 TX_EN Input Transmit enable signal, enables the transmission of data. 31 RX_CLK Input Receive clock signal for the data. 32 TX_CLK Output Transmit clock signal for the data. 33 REF_CLK Input Reference clock input signal for the device. 34 CTL_TXD0 Output Control signal for transmit data 0. 35 CTL_TXD1 Output Control signal for transmit data 1. 36 CTL_RXD0 Input Control signal for receive data 0. 37 CTL_RXD1 Input Control signal for receive data 1. 38 VDD_ANA Power Analog power supply for internal components. 39 NC No Connection No internal connection, can be left floating. 40 NC No Connection No internal connection, can be left floating. 41 AVSS Ground Ground for analog section of the device. 42 AVSS_2 Ground Ground for analog section of the device. 43 LED_10M Output LED indicator for 10 Mbps speed. 44 LED_100M Output LED indicator for 100 Mbps speed. 45 LED_1000M Output LED indicator for 1000 Mbps speed. 46 N.C. No Connection No internal connection, can be left floating. 47 N.C. No Connection No internal connection, can be left floating. 48 GND Ground Ground connection for the device.Frequently Asked Questions (FAQ)
What is the input voltage for the RTL8211FI-CG? The RTL8211FI-CG operates with input voltages of 3.3V and 2.5V. What is the typical application for the RTL8211FI-CG? The RTL8211FI-CG is used in Ethernet applications for network connections, providing 10/100/1000 Mbps speeds. Can the RTL8211FI-CG work in 10 Mbps mode? Yes, it supports 10/100/1000 Mbps Ethernet standards. How do I reset the RTL8211FI-CG? The reset is controlled via the RESET pin. A low voltage on this pin initiates a reset. What is the purpose of the LED_SPEED pin? The LED_SPEED pin indicates the speed of the Ethernet connection: 10, 100, or 1000 Mbps. What should I connect to the MDIO and MDC pins? MDIO and MDC are for Ethernet management and should be connected to a microcontroller or Ethernet controller for management operations. What is the function of the RX_ER pin? The RX_ER pin indicates whether there is an error in the received data stream. Can I use the PWDN pin to power down the device? Yes, applying a low signal to the PWDN pin will power down the device. What are the main differences between the RTL8211FI-CG and other Realtek Ethernet chips? Differences are mainly in the supported speeds, power requirements, and specific pinouts for each application.What is the function of the REF_CLK pin?
The REF_CLK pin provides a reference clock input for synchronization with the rest of the network.What is the voltage range for the power supply pins (VDD33 and VDD25)?
VDD33 accepts 3.3V, and VDD25 accepts 2.5V.Does the RTL8211FI-CG support full-duplex communication?
Yes, it supports full-duplex Ethernet communication.What kind of package does the RTL8211FI-CG come in?
The RTL8211FI-CG typically comes in a 48-pin QFN package.How do I connect the LEDs to indicate Ethernet link and speed?
The LEDs are controlled via the LEDLINK, LE DSP EED, LED10M, LED100M, and LED_1000M pins.How do I connect the transmitter and receiver data lines?
TX0+, TX0-, RX0+, RX0- are the pins used for transmit and receive data, following differential signaling.What is the RX_CLK signal used for?
RX_CLK provides the clock signal for receiving data.Can the RTL8211FI-CG interface with microcontrollers?
Yes, the chip can interface with microcontrollers through the MDIO and MDC pins for management tasks.What happens if the INT pin is triggered?
The INT pin is used to signal an interrupt, indicating an event like data availability or error detection.How can I interface the RTL8211FI-CG with higher-level devices?
You can connect the RTL8211FI-CG to a higher-level controller through the MII interface.Does the RTL8211FI-CG support error checking?
Yes, it supports error checking through the RX_ER pin and other diagnostic mechanisms.