The LAN8720AI-CP-TR is a product manufactured by Microchip Technology, and it is an Ethernet PHY (Physical Layer) integrated circuit. The specific function of this IC is to provide Ethernet connectivity to embedded systems, enabling them to communicate over a network. The device is part of the LAN8720 family, which is typically used in low- Power , cost-effective applications.
Package Type and Pin Function Specifications:
The LAN8720AI-CP-TR comes in the QFN-32 (Quad Flat No-lead) package, which has 32 pins in total. Below is a detai LED breakdown of the pin functions for this IC:
Pinout Overview of LAN8720AI-CP-TR:
Pin Number Pin Name Pin Function Description 1 TXD0 Transmit Data (bit 0) 2 TXD1 Transmit Data (bit 1) 3 TXD2 Transmit Data (bit 2) 4 TXD3 Transmit Data (bit 3) 5 TXEN Transmit Enable 6 RXD0 Receive Data (bit 0) 7 RXD1 Receive Data (bit 1) 8 RXD2 Receive Data (bit 2) 9 RXD3 Receive Data (bit 3) 10 RXDV Receive Data Valid 11 RXER Receive Error (indicates if an error occurred while receiving data) 12 MDC Management Data Clock (used for communicating with the PHY management interface ) 13 MDIO Management Data Input/Output (used for PHY management interface) 14 VSS Ground Pin (used to connect the IC to ground) 15 VDD Power Supply Pin (typically 3.3V) 16 REFCLK Reference Clock Input (used for clocking the PHY interface) 17 CLK25M 25 MHz Clock Output (provides a clock output for the system) 18 RST Reset Pin (used to reset the PHY) 19 MDINT Interrupt Pin (used for interrupt signaling from the PHY to the host) 20 LED_LINK LED Indicator for Link Status (indicates network link status) 21 LED_ACTIVITY LED Indicator for Activity (indicates network activity) 22 LED_SPEED LED Indicator for Speed (indicates the link speed) 23 INT_N Interrupt Signal (used for system notifications) 24 ECR Extended Control Register (for special PHY control settings) 25 CLK_RMII Clock for Reduced Media Independent Interface (RMII) 26 TX_CLK Transmit Clock (used for the transmitting side of the PHY) 27 RX_CLK Receive Clock (used for the receiving side of the PHY) 28 VSS Ground Pin (another ground pin) 29 VDD Power Pin (another power pin for the IC) 30 RXER Receive Error Pin (to indicate errors during reception) 31 TX_EN Transmit Enable Pin (controls the transmitting of data) 32 SPD_SEL Speed Selection Pin (used to select the speed of the PHY)Detailed Function Explanation for Each Pin:
TXD0 to TXD3: These pins are used to transmit data. The 4 bits represent one byte of data, and the data is sent in parallel over the Ethernet link. RXD0 to RXD3: These pins are used to receive data. Similar to the TXD pins, these pins carry data in parallel from the Ethernet connection. TXEN: This pin is used to enable or disable the transmission of data. It ensures that the PHY only sends data when appropriate. RXDV: Indicates when valid data is being received. It is asserted when the data is valid on the receive data pins. RXER: This pin indicates if there is an error with the received data. MDC and MDIO: These pins are part of the PHY’s management interface, used for configuration and status reporting through the MDIO protocol. VSS and VDD: These are the ground and power pins, typically for 3.3V power supply. REFCLK: Provides the reference clock for the Ethernet interface, often from an external source. CLK25M: This pin outputs a 25 MHz clock, used for timing in the system. RST: Used to reset the device to its default state. MDINT: Used to signal interrupts from the PHY to the host system. LEDLINK, LEDACTIVITY, LED_SPEED: These pins control status LEDs to indicate the link, activity, and speed status of the Ethernet connection. ECR: This pin is used for extended configuration and control settings. CLK_RMII: Provides the clock for the Reduced Media Independent Interface, used to reduce the pin count and power consumption compared to the standard MII interface. TXCLK and RXCLK: These pins provide the clock signals for data transmission and reception, ensuring proper synchronization of data transfer.Frequently Asked Questions (FAQ):
1. What is the purpose of the LAN8720AI-CP-TR? The LAN8720AI-CP-TR is an Ethernet PHY designed to provide physical layer connectivity for embedded systems, enabling them to communicate over Ethernet networks.
2. What is the voltage requirement for the LAN8720AI-CP-TR? The LAN8720AI-CP-TR typically operates with a 3.3V power supply, with its VDD pins requiring this voltage.
3. Can the LAN8720AI-CP-TR support 10/100 Ethernet speeds? Yes, the LAN8720AI-CP-TR supports both 10 Mbps and 100 Mbps Ethernet speeds through an MII or RMII interface.
4. What does the TXD0–TXD3 pins represent? The TXD0–TXD3 pins are used to transmit data bits (bits 0-3) in parallel over the Ethernet network.
5. How does the RXD0–RXD3 work? The RXD0–RXD3 pins are used to receive data bits (bits 0-3) in parallel from the Ethernet network.
6. What is the purpose of the TXEN pin? The TXEN pin enables or disables the transmission of data. It is essential for controlling data flow.
7. What is the function of the RXDV pin? The RXDV pin indicates whether the received data is valid, signaling the receiver to process the data.
8. What kind of error does the RXER pin detect? The RXER pin detects errors during the reception of data, such as misalignment or framing errors.
9. Can the LAN8720AI-CP-TR be configured through the MDIO interface? Yes, the MDIO interface allows configuration and management of the LAN8720AI-CP-TR via the MDC and MDIO pins.
10. What does the REFCLK pin provide? The REFCLK pin provides the reference clock signal needed for proper timing in the PHY interface.
11. What is the purpose of the RST pin? The RST pin is used to reset the LAN8720AI-CP-TR to its default state, clearing all internal registers.
12. How does the MDINT pin function? The MDINT pin is used to signal an interrupt from the PHY to the host system, typically indicating a status change or an error.
13. What information does the LEDLINK pin provide? The LEDLINK pin indicates whether a network link is established, lighting up when the PHY detects a valid link.
14. How does the LEDACTIVITY pin work? The LEDACTIVITY pin lights up to indicate network activity, signaling data transmission or reception.
15. What does the LE DSP EED pin indicate? The LEDSPEED pin shows the connection speed (10/100 Mbps) through a status LED.
16. Is there a way to configure the PHY’s extended settings? Yes, the ECR pin allows for the configuration of extended control register settings to modify PHY behavior.
17. Can the LAN8720AI-CP-TR support both MII and RMII interfaces? Yes, the LAN8720AI-CP-TR supports both MII (Media Independent Interface) and RMII (Reduced Media Independent Interface) for data transfer.
18. What is the function of the CLKRMII pin? The CLKRMII pin provides the clock signal required for the RMII interface.
19. What is the role of the TXCLK pin? The TXCLK pin provides the clock signal used for transmitting data on the PHY.
20. How is the RXCLK pin used? The RXCLK pin provides the clock signal used for receiving data from the Ethernet link.
These are the full specifications and FAQs for the LAN8720AI-CP-TR, ensuring that all pins and functionalities are detailed clearly.