LAN8720A-CP-TR Detai LED explanation of pin function specifications and circuit principle instructions

The model " LAN8720A-CP -TR" is a part of the LAN8720 series Ethernet PHY (Physical Layer) transceiver from Microchip Technology. It is used for 10/100 Ethernet communication over copper cables.

The LAN8720A-CP-TR uses a QFN-32 (Quad Flat No-leads) package, which has 32 pins. Here is a detai LED description of each of the 32 pins and their functions, as well as 20 common frequently asked questions (FAQs) regarding the LAN8720A-CP-TR:

Pin Function Table for LAN8720A-CP-TR:

Pin Number Pin Name Pin Type Pin Function Description 1 VSS Power Ground pin for the device. 2 X1 Input External oscillator input. 3 X2 Output External oscillator output. 4 AN1 Analog Analog signal input for the auto-negotiation circuit. 5 AN0 Analog Analog signal input for the auto-negotiation circuit. 6 RXD0 Digital Ethernet receive data bit 0 (from PHY to MAC). 7 RXD1 Digital Ethernet receive data bit 1 (from PHY to MAC). 8 RXD2 Digital Ethernet receive data bit 2 (from PHY to MAC). 9 RXD3 Digital Ethernet receive data bit 3 (from PHY to MAC). 10 TXD0 Digital Ethernet transmit data bit 0 (from MAC to PHY). 11 TXD1 Digital Ethernet transmit data bit 1 (from MAC to PHY). 12 TXD2 Digital Ethernet transmit data bit 2 (from MAC to PHY). 13 TXD3 Digital Ethernet transmit data bit 3 (from MAC to PHY). 14 TX_CLK Digital Transmit clock output for synchronous transmission. 15 RX_CLK Digital Receive clock input. 16 MDIO Digital Management data input/output for communication with the MAC layer. 17 MDC Digital Management data clock for communication with the MAC layer. 18 INT Digital Interrupt output pin to indicate event status or error. 19 VDD Power Power supply pin (typically 3.3V). 20 NC No Connect No connection (floating). 21 RGMIIRXCTL Digital Receive control signal (RGMII mode only). 22 RGMII_RXD0 Digital Receive data bit 0 (RGMII mode only). 23 RGMII_RXD1 Digital Receive data bit 1 (RGMII mode only). 24 RGMII_RXD2 Digital Receive data bit 2 (RGMII mode only). 25 RGMII_RXD3 Digital Receive data bit 3 (RGMII mode only). 26 RGMIITXCTL Digital Transmit control signal (RGMII mode only). 27 RGMII_TXD0 Digital Transmit data bit 0 (RGMII mode only). 28 RGMII_TXD1 Digital Transmit data bit 1 (RGMII mode only). 29 RGMII_TXD2 Digital Transmit data bit 2 (RGMII mode only). 30 RGMII_TXD3 Digital Transmit data bit 3 (RGMII mode only). 31 RESETn Active Low Reset pin for the device (active low). 32 LED0 Digital LED output to indicate the device's status (can be configured for different states).

20 Common FAQs for LAN8720A-CP-TR:

What is the LAN8720A-CP-TR? The LAN8720A-CP-TR is an Ethernet PHY transceiver from Microchip, designed to interface with MAC devices for Ethernet communication over copper cables at 10/100 Mbps speeds. What is the pin count of the LAN8720A-CP-TR? The LAN8720A-CP-TR comes in a 32-pin QFN package. How do I connect the LAN8720A-CP-TR to a microcontroller? You need to connect the MDIO, MDC, TX/RX lines, and the clock inputs/outputs between the microcontroller and the PHY. Ensure the power supply is correctly connected to VDD and VSS. What voltage does the LAN8720A-CP-TR operate on? The LAN8720A-CP-TR typically operates at 3.3V for VDD. What is the purpose of the X1 and X2 pins on the LAN8720A-CP-TR? X1 and X2 are used for the external clock oscillator input and output to synchronize the PHY’s operations. What is the function of the RESETn pin? The RESETn pin is used to reset the PHY device when held low. It’s an active-low reset input. Can the LAN8720A-CP-TR be used for both 10Base-T and 100Base-T Ethernet? Yes, the LAN8720A-CP-TR supports both 10Base-T and 100Base-T Ethernet standards. What is the function of the LED0 pin? LED0 can be configured to indicate the status of the PHY (e.g., link status, speed, activity). How does the auto-negotiation feature work on the LAN8720A-CP-TR? The auto-negotiation feature allows the PHY to automatically select the highest possible link speed (10 Mbps, 100 Mbps) and duplex mode (half/full).

How do I configure the MAC to communicate with the LAN8720A-CP-TR?

The MAC should be configured to use the MDIO and MDC interface for management and to send/receive Ethernet frames via the TX/RX pins.

What is the purpose of the RGMII interface?

The RGMII interface is used to provide higher-speed Ethernet communication (1000 Mbps or Gigabit) compared to the standard MII interface.

What is the function of the AN0 and AN1 pins?

AN0 and AN1 are analog pins used for auto-negotiation signals during the link establishment process.

Can I use the LAN8720A-CP-TR with an external clock source?

Yes, the LAN8720A-CP-TR can operate with an external clock source connected to the X1 and X2 pins.

What type of Ethernet cable is compatible with the LAN8720A-CP-TR?

The LAN8720A-CP-TR supports standard Ethernet cables, including Cat5 or higher, for 10/100 Ethernet communication.

What is the purpose of the RX_CLK pin?

RX_CLK is used to input the clock signal for the Ethernet receive operation, especially in RGMII mode.

Is the LAN8720A-CP-TR backward compatible with older Ethernet standards?

Yes, it supports backward compatibility with both 10Base-T and 100Base-T Ethernet standards.

How do I reset the LAN8720A-CP-TR?

Reset the device by pulling the RESETn pin low for at least 10 µs and then releasing it.

What is the function of the MDIO and MDC pins?

MDIO and MDC are used for managing the PHY device, allowing the MAC to configure and monitor the PHY settings through a management protocol.

Can the LAN8720A-CP-TR interface directly with a PC?

No, the LAN8720A-CP-TR requires an Ethernet MAC or microcontroller to interface with a PC or other network devices.

How do I handle interrupts from the LAN8720A-CP-TR?

The INT pin can be monitored to detect interrupt signals indicating various statuses such as link changes or error conditions.

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