LAN8742A-CZ-TR Detailed explanation of pin function specifications and circuit principle instructions
The LAN8742A-CZ-TR is a product from Microchip Technology. It is a Fast Ethernet PHY (Physical Layer Device), which is designed for use in various Ethernet communication systems. This chip supports a range of Ethernet standards and offers an interface between a Media Access Controller (MAC) and a physical network medium (typically twisted pair cables for Ethernet). The LAN8742A is used for applications that require high-speed, reliable networking in embedded systems, industrial networks, and other Ethernet-based designs.
Package Information:
The LAN8742A-CZ-TR comes in a QFN-32 package, which has 32 pins. The QFN (Quad Flat No-lead) package is a surface-mount technology package with no leads, offering a smaller footprint and better performance compared to traditional leaded packages.
Pin Function Table for LAN8742A-CZ-TR (32 Pins)
Here’s the detai LED list of each pin function for the LAN8742A-CZ-TR. It includes all 32 pins:
Pin Number Pin Name Function Description 1 VDD_3V3 Power supply for the chip (3.3V) 2 VDD_3V3 Power supply for the chip (3.3V) 3 RXD0 Receive Data, bit 0 (Serial data from PHY) 4 RXD1 Receive Data, bit 1 (Serial data from PHY) 5 RXD2 Receive Data, bit 2 (Serial data from PHY) 6 RXD3 Receive Data, bit 3 (Serial data from PHY) 7 RX_CLK Receive Clock (Clock signal for RX data) 8 TXD0 Transmit Data, bit 0 (Data sent from PHY) 9 TXD1 Transmit Data, bit 1 (Data sent from PHY) 10 TXD2 Transmit Data, bit 2 (Data sent from PHY) 11 TXD3 Transmit Data, bit 3 (Data sent from PHY) 12 TX_CLK Transmit Clock (Clock signal for TX data) 13 COL Collision Detect (Indicates network collision) 14 CRS Carrier Sense (Indicates network activity) 15 LED1 LED1 output for link/activity status (Indicator for link) 16 LED2 LED2 output for speed/status (Indicator for speed) 17 MII_MDIO Management Data Input/Output (Data transfer line for management interface) 18 MII_MDC Management Data Clock (Clock line for management interface) 19 RESETn Reset input (Active-low reset signal) 20 XTAL_IN Crystal Oscillator Input (Clock input for PHY) 21 XTAL_OUT Crystal Oscillator Output (Clock output from PHY) 22 AVDD_3V3 Analog power supply (3.3V for analog functions) 23 AVSS Analog ground (Common ground for analog functions) 24 NC No Connect (Not used) 25 VSS Ground pin (Common ground for the chip) 26 VSS Ground pin (Common ground for the chip) 27 VSS Ground pin (Common ground for the chip) 28 VDD_3V3 Power supply for the chip (3.3V) 29 VDD_3V3 Power supply for the chip (3.3V) 30 LED3 LED3 output for power status (Indicates power status) 31 LED4 LED4 output for fault/error indication (Indicates error) 32 VSS Ground pin (Common ground for the chip)FAQ for LAN8742A-CZ-TR
Here are the 20 most frequently asked questions (FAQ) for the LAN8742A-CZ-TR:
Q: What is the power supply voltage for the LAN8742A-CZ-TR? A: The LAN8742A-CZ-TR requires a 3.3V power supply for its operation.
Q: What is the package type of the LAN8742A-CZ-TR? A: The LAN8742A-CZ-TR comes in a QFN-32 package.
Q: How many pins does the LAN8742A-CZ-TR have? A: The LAN8742A-CZ-TR has 32 pins.
Q: What does the RESETn pin do? A: The RESETn pin is an active-low reset signal used to reset the device.
Q: Can the LAN8742A-CZ-TR support 1000BASE-T Ethernet? A: No, the LAN8742A-CZ-TR supports Fast Ethernet (10/100Mbps), not Gigabit Ethernet (1000BASE-T).
Q: How does the LED1 function? A: LED1 indicates the link/activity status on the network, such as whether there is an active Ethernet connection.
Q: What is the purpose of the MIIMDIO pin? A: The MIIMDIO pin is used for the Management Data Input/Output interface to communicate configuration data.
Q: How is the transmit data handled by the LAN8742A-CZ-TR? A: Transmit data is handled through the TXD0 to TXD3 pins, which send serial data from the PHY to the MAC.
Q: What does the CRS pin indicate? A: The CRS pin indicates network activity by signaling when there is traffic on the network.
Q: How do the RXD0 to RXD3 pins function? A: The RXD0 to RXD3 pins receive serial data from the PHY to the MAC.
Q: What is the function of the TXCLK pin? A: The TXCLK pin provides the clock signal for transmitting data from the PHY.
Q: Is the LAN8742A-CZ-TR compatible with full-duplex Ethernet? A: Yes, the LAN8742A-CZ-TR supports full-duplex Ethernet.
Q: Can the LAN8742A-CZ-TR operate without an external oscillator? A: No, the LAN8742A-CZ-TR requires an external crystal oscillator connected to the XTALIN and XTALOUT pins.
Q: How does the LAN8742A-CZ-TR detect network collisions? A: The LAN8742A-CZ-TR uses the COL pin to detect collisions on the network.
Q: What type of network speeds does the LAN8742A-CZ-TR support? A: The LAN8742A-CZ-TR supports 10Mbps and 100Mbps network speeds.
Q: Does the LAN8742A-CZ-TR support Power over Ethernet (PoE)? A: No, the LAN8742A-CZ-TR does not support Power over Ethernet (PoE).
Q: How many LEDs can be controlled by the LAN8742A-CZ-TR? A: The LAN8742A-CZ-TR can control up to 4 LEDs, LED1 to LED4.
Q: What is the role of the AVDD3V3 pin? A: The AVDD3V3 pin provides 3.3V power for the analog functions of the PHY.
Q: How do the LED indicators work? A: The LEDs indicate different statuses such as link activity, speed, power, and error conditions.
Q: Can the LAN8742A-CZ-TR be used in industrial networking applications? A: Yes, the LAN8742A-CZ-TR is suitable for use in embedded and industrial networking applications due to its reliable performance in various environments.
This completes the detailed explanation and pin functions for the LAN8742A-CZ-TR.
