The " LAN8720AI-CP -TR" is a part from Microchip Technology, a company known for offering a wide range of semiconductor products, particularly in networking and embedded systems.
Here’s an overview of the requested information:
Package Type
The LAN8720AI-CP-TR is typically available in the QFN (Quad Flat No-lead) package, which is a surface-mount technology package with leads underneath the chip. It comes in a 28-pin configuration.
Pin Function Table
Below is a detai LED pin function table for the LAN8720AI-CP-TR (28 pins in total):
Pin # Pin Name Function Description 1 VDD_3V3 Power supply input (3.3V). The LAN8720 requires a stable 3.3V power source. 2 GND Ground pin for the device. Connect to the system ground. 3 TXD0 Transmit data output, bit 0. This pin transmits the low byte of the Ethernet data. 4 TXD1 Transmit data output, bit 1. This pin transmits the high byte of the Ethernet data. 5 TX_EN Transmit Enable. This signal indicates that data is available to be transmitted on the TXD0 and TXD1 lines. 6 TX_ER Transmit Error. Indicates if there is an error during data transmission. 7 RXD0 Receive data input, bit 0. This pin receives the low byte of the Ethernet data. 8 RXD1 Receive data input, bit 1. This pin receives the high byte of the Ethernet data. 9 RX_DV Receive Data Valid. This signal indicates that valid data is present on RXD0 and RXD1. 10 RX_ER Receive Error. This signal indicates if there is an error during data reception. 11 COL Collision Detect. This signal is activated when a collision occurs in the Ethernet network. 12 CRS Carrier Sense. This pin is used to indicate whether the network medium is in use. 13 MDIO Management Data Input/Output. Used for communicating with the PHY via the MDIO interface . 14 MDC Management Data Clock . Used with MDIO to manage the PHY’s configuration and status. 15 LED0 LED Output 0. Indicates status (e.g., link status or speed) based on the configuration of the LED pins. 16 LED1 LED Output 1. Similar to LED0, it is used for showing other status information (e.g., activity, link speed). 17 VDD_IO Power supply input for I/O (3.3V). This pin supplies the voltage to I/O logic circuits. 18 RESET Reset. A low signal on this pin resets the device, restarting the Ethernet connection process. 19 REF_CLK Reference clock input (25 MHz). This clock signal is used for timing operations in the PHY. 20 TX_CLK Transmit clock. Used for synchronization during data transmission. 21 RX_CLK Receive clock. Used for synchronization during data reception. 22 SMI_MODE Serial Management Interface mode. This pin configures the device for the appropriate operation mode. 23 INT Interrupt output. This pin can be used to signal when there is a specific event or condition (e.g., link up/down). 24 PHYAD[4] PHY address bit 4. Used to configure the device's address in a multi-device network. 25 PHYAD[3] PHY address bit 3. 26 PHYAD[2] PHY address bit 2. 27 PHYAD[1] PHY address bit 1. 28 PHYAD[0] PHY address bit 0.Pin Function FAQs
Q: What is the voltage requirement for the LAN8720AI-CP-TR? A: The LAN8720AI-CP-TR requires a 3.3V power supply for both VDD3V3 and VDDIO pins.
Q: What is the function of the RXD0 and RXD1 pins? A: RXD0 and RXD1 are receive data input pins that handle the low and high bytes of Ethernet data, respectively.
Q: How does the TXEN pin work? A: TXEN is the Transmit Enable pin, which indicates that the device is ready to transmit data on the TXD0 and TXD1 pins.
Q: What is the role of the CRS and COL pins? A: CRS (Carrier Sense) signals whether the network medium is busy, and COL (Collision Detect) signals when a collision is detected in the Ethernet network.
Q: Can I use the LAN8720AI-CP-TR with a 5V power supply? A: No, the LAN8720AI-CP-TR operates on 3.3V, and applying 5V may damage the device.
Q: What type of clock signal is required for the LAN8720AI-CP-TR? A: The device requires a 25 MHz reference clock, provided through the REF_CLK pin.
Q: What is the purpose of the MDIO and MDC pins? A: MDIO and MDC are used for the Management Data Input/Output and Management Data Clock, respectively, to communicate with the PHY for configuration and status monitoring.
Q: How do the LED0 and LED1 pins function? A: LED0 and LED1 output status indicators for various conditions such as link status, speed, or activity, based on configuration.
Q: What is the RESET pin used for? A: The RESET pin is used to reset the LAN8720AI-CP-TR device. A low signal initiates a reset of the chip.
Q: What does the PHYAD pins do? A: The PHYAD pins (PHYAD[0] to PHYAD[4]) define the PHY address for the device when there are multiple PHYs on the network.
Q: How can I determine if the LAN8720AI-CP-TR is functioning correctly? A: You can monitor the INT pin, which will indicate any specific conditions or events such as link status changes.
Q: What should be done if the device is not transmitting data? A: Check the TX_EN pin to ensure it is properly activated, and verify the integrity of the TXD0 and TXD1 pins for data output.
Q: What is the significance of the RXER pin? A: RXER indicates a reception error, signaling that the received data was corrupted or invalid.
Q: Can the LAN8720AI-CP-TR be used in both full-duplex and half-duplex modes? A: Yes, the LAN8720AI-CP-TR supports both full-duplex and half-duplex Ethernet modes, which can be configured via the management interface.
Q: Is it necessary to use the TXCLK and RXCLK pins? A: Yes, both the TXCLK and RXCLK pins are essential for synchronization during the data transmission and reception process.
Q: What happens if I do not connect the CRS pin? A: The CRS pin is important for carrier sensing; if not connected, the PHY might not properly detect network activity.
Q: How do I configure the device for 10Mbps or 100Mbps operation? A: The LAN8720AI-CP-TR automatically negotiates the speed based on the connected network's capabilities.
Q: Can the LAN8720AI-CP-TR handle both 10/100 Mbps Ethernet speeds? A: Yes, the LAN8720AI-CP-TR supports both 10Mbps and 100Mbps Ethernet speeds.
Q: What kind of external components are needed for this device? A: Typically, you need external components like capacitor s for power stability and an external clock source for the reference clock.
Q: What is the function of the VDDIO pin? A: VDDIO provides power to the I/O logic circuits of the LAN8720AI-CP-TR, and it should be supplied with a 3.3V voltage.
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