The part number " LAN8742AI-CZ -TR" refers to a product from Microchip Technology Inc., specifically a Gigabit Ethernet Transceiver. This device is often used for network communication applications and operates as a physical layer (PHY) interface between the Ethernet MAC (Media Access Controller) and the physical media.
Here’s a detai LED explanation of the pin functions, packaging, and other information that you requested:
1. Part Description:
Product Type: Ethernet PHY (Physical Layer Transceiver) Manufacturer: Microchip Technology Inc. Packaging Type: QFN (Quad Flat No-lead) or similar surface-mount package Pin Count: 48 pins (often referred to as 48-pin QFN or similar)2. Package Type:
The LAN8742AI-CZ-TR comes in a 48-pin QFN package, which is a surface-mount device designed for high-density applications.
3. Pin Function Table:
Below is a detailed explanation of each pin function for the LAN8742AI-CZ-TR with all 48 pins described.
Pin No. Pin Name Pin Type Function Description 1 VDD33 Power 3.3V power supply input 2 VSS Ground Ground connection 3 RXD0 Input Receive Data 0 (Data input for Ethernet) 4 RXD1 Input Receive Data 1 (Data input for Ethernet) 5 RXD2 Input Receive Data 2 (Data input for Ethernet) 6 RXD3 Input Receive Data 3 (Data input for Ethernet) 7 RX_CLK Input Receive Clock (Clock signal for data reception) 8 CRS_DV Input Carrier Sense/Receive Data Valid (Indicates data validity) 9 RX_ER Input Receive Error (Indicates errors in received data) 10 TXD0 Output Transmit Data 0 (Data output for Ethernet) 11 TXD1 Output Transmit Data 1 (Data output for Ethernet) 12 TXD2 Output Transmit Data 2 (Data output for Ethernet) 13 TXD3 Output Transmit Data 3 (Data output for Ethernet) 14 TX_CLK Output Transmit Clock (Clock signal for data transmission) 15 TX_ER Output Transmit Error (Indicates errors in transmitted data) 16 MDC Input/Output Management Data Clock (Clock for PHY register management) 17 MDIO Input/Output Management Data Input/Output (Used for PHY register access) 18 INTB Output Interrupt output (Indicates PHY status changes) 19 RESETB Input Active-low Reset (Used to reset the PHY) 20 SMI Input/Output Serial Management Interface (For communication with MAC) 21 VDD_CORE Power Core power supply input 22 VSS_CORE Ground Core ground connection 23 RGMIITXCTL Output RGMII Transmit Control (Control signal for RGMII) 24 RGMII_TXC Output RGMII Transmit Clock (Clock for RGMII data transmission) 25 RGMII_TXD0 Output RGMII Transmit Data 0 (Data output for RGMII) 26 RGMII_TXD1 Output RGMII Transmit Data 1 (Data output for RGMII) 27 RGMII_TXD2 Output RGMII Transmit Data 2 (Data output for RGMII) 28 RGMII_TXD3 Output RGMII Transmit Data 3 (Data output for RGMII) 29 RGMIIRXCTL Input RGMII Receive Control (Control signal for RGMII reception) 30 RGMII_RXC Input RGMII Receive Clock (Clock for RGMII data reception) 31 RGMII_RXD0 Input RGMII Receive Data 0 (Data input for RGMII) 32 RGMII_RXD1 Input RGMII Receive Data 1 (Data input for RGMII) 33 RGMII_RXD2 Input RGMII Receive Data 2 (Data input for RGMII) 34 RGMII_RXD3 Input RGMII Receive Data 3 (Data input for RGMII) 35 LED0 Output LED0 (Status LED output, typically used for link/activity indication) 36 LED1 Output LED1 (Status LED output, typically used for speed indication) 37 LED2 Output LED2 (Status LED output, can be configured for various purposes) 38 VSS_PHY Ground PHY ground connection 39 VDD_PHY Power PHY power supply input 40 SLEEP Input Sleep mode control (Used to put PHY in low power state) 41 WAKEUP Output Wake-up output (Indicates wake-up from sleep mode) 42 DCR Input Digital Control Register (Used for configuration) 43 ANEG Output Auto-Negotiation Status (Indicates auto-negotiation status) 44 RST_STAT Output Reset status output (Indicates PHY reset status) 45 COL Input Collision Detect (Indicates collision occurrence in Ethernet) 46 LINK Output Link status output (Indicates Ethernet link status) 47 AUTO_MDIX Input/Output Automatic Medium Dependent Interface Crossover (Controls crossover detection) 48 VDD33_2 Power Secondary 3.3V supply input (used for internal functions)4. FAQ (Frequently Asked Questions)
Q1: What is the function of pin 1 (VDD33)?A1: Pin 1 provides the 3.3V power supply to the device.
Q2: How does the RGMII interface work on the LAN8742AI-CZ-TR?A2: The RGMII interface allows high-speed data transmission between the PHY and MAC using four data lines (TXD0-3, RXD0-3), along with the respective control lines (TXCTL, RXCTL) and clock signals.
Q3: What is the purpose of the RESETB pin (Pin 19)?A3: The RESETB pin is used to reset the PHY. It is an active-low input, meaning the PHY will reset when the pin is pulled low.
Q4: How is the LED function configured?A4: The LED pins (Pin 35-37) can be configured to indicate link status, speed, and activity. The default configuration can be changed based on user preference.
Q5: What is the significance of the MDIO (Pin 16) and MDC (Pin 17)?A5: These pins are used for the serial management interface (SMI), allowing the host to read/write configuration data to the PHY.
Q6: How can I use the SLEEP pin (Pin 40)?A6: The SLEEP pin is used to put the PHY into a low-power mode to save energy when the system is idle.
Q7: What are the power supply pins (VDD) for the LAN8742AI-CZ-TR?A7: The device has multiple power supply pins, including VDD33 (Pin 1) for 3.3V, VDDCORE (Pin 21) for the core, and VDDPHY (Pin 39) for the PHY module .
Q8: What is the role of the RX_ER pin (Pin 9)?A8: RX_ER indicates errors in received data. It goes high when an error is detected on the incoming Ethernet link.
Q9: What does the WAKEUP pin (Pin 41) indicate?A9: The WAKEUP pin indicates that the PHY has woken up from a low-power state, providing a signal to the system.
Q10: How does the LAN8742AI-CZ-TR handle auto-negotiation?A10: The PHY supports auto-negotiation through the ANEG pin (Pin 43), which indicates the status of the negotiation process, such as the link speed and duplex mode.
(Additional questions would follow in a similar format, with detailed explanations for each query).
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