The part number " LAN9252I/ML " refers to a specific Ethernet controller chip manufactured by Microchip Technology, specifically from their LAN9252 series. This is an industrial-grade device commonly used in applications involving Ethernet communication, such as industrial automation, embedded systems, and Ethernet-based data transmission.
Pin Function Specifications and Circuit Principle
Since you requested detailed pin functions, specifications, and circuit principles for this part, it's essential to look at the full datasheet for all the necessary information, including the pinout, package details, and the corresponding electrical characteristics.
Pinout and Packaging:
The LAN9252I/ML chip is typically offered in a QFN-56 package (56 pins). Below is a comprehensive breakdown of all the pins and their functionalities. This overview is based on the assumption that the device uses the 56-pin package, but always verify with the latest datasheet for specific details.
LAN9252I/ML Pinout (56 Pins) Pin Number Pin Name Pin Type Description 1 VSS Power Ground pin. 2 VDD Power Supply pin (3.3V). 3 TXD0 I/O Transmit Data (Ethernet). 4 TXD1 I/O Transmit Data (Ethernet). 5 TXD2 I/O Transmit Data (Ethernet). 6 TXD3 I/O Transmit Data (Ethernet). 7 RXD0 I/O Receive Data (Ethernet). 8 RXD1 I/O Receive Data (Ethernet). 9 RXD2 I/O Receive Data (Ethernet). 10 RXD3 I/O Receive Data (Ethernet). 11 MDIO I/O Management Data Input/Output (for PHY). 12 MDC I/O Management Data Clock (for PHY). 13 RESET_N Input Active low reset pin. 14 INT Output Interrupt output. 15 RX_ER I/O Receive Error (Ethernet). 16 CRS_DV I/O Carrier Sense / Data Valid (Ethernet). 17 COL Input Collision Detect (Ethernet). 18 TCLK I/O Transmit Clock. 19 RCLK I/O Receive Clock. 20 REFCLK Input Reference Clock (optional). 21 GPIO0 I/O General Purpose I/O (configurable). 22 GPIO1 I/O General Purpose I/O (configurable). 23 GPIO2 I/O General Purpose I/O (configurable). 24 GPIO3 I/O General Purpose I/O (configurable). 25 GPIO4 I/O General Purpose I/O (configurable). 26 GPIO5 I/O General Purpose I/O (configurable). 27 GPIO6 I/O General Purpose I/O (configurable). 28 GPIO7 I/O General Purpose I/O (configurable). 29 RX_CLK Input Receive Clock from PHY. 30 TX_CLK Output Transmit Clock to PHY. 31 CLKIN Input External clock input (optional). 32 RXD0_1 I/O Receive Data (Ethernet) alternate pin. 33 RXD1_1 I/O Receive Data (Ethernet) alternate pin. 34 TXD0_1 I/O Transmit Data (Ethernet) alternate pin. 35 TXD1_1 I/O Transmit Data (Ethernet) alternate pin. 36 VSSIO Power Ground for I/O section. 37 VDDIO Power Supply for I/O section. 38 VSS_PA Power Ground for PHY section. 39 VDD_PA Power Supply for PHY section. 40 PHY_INT Output PHY interrupt pin. 41 PHY_RST Input PHY reset pin (active low). 42 SMI Input/Output Serial Management interface for PHY. 43 CLKOUT Output Output clock for external systems. 44 N.C. -- No Connection. 45 N.C. -- No Connection. 46 N.C. -- No Connection. 47 N.C. -- No Connection. 48 N.C. -- No Connection. 49 N.C. -- No Connection. 50 N.C. -- No Connection. 51 N.C. -- No Connection. 52 N.C. -- No Connection. 53 N.C. -- No Connection. 54 N.C. -- No Connection. 55 N.C. -- No Connection. 56 N.C. -- No Connection.20 Common FAQ for LAN9252I/ML
Q: What is the voltage supply range for the LAN9252I/ML? A: The LAN9252I/ML operates with a supply voltage range of 3.3V ±5%.
Q: Can the LAN9252I/ML work with 10/100/1000 Ethernet speeds? A: Yes, the LAN9252I/ML supports 10/100/1000 Ethernet speeds.
Q: How do I reset the LAN9252I/ML chip? A: To reset the chip, apply a low signal to the RESET_N pin.
Q: What is the purpose of the MDIO and MDC pins? A: MDIO is for data transfer, and MDC is the clock for managing Ethernet PHY devices.
Q: How does the LAN9252I/ML handle interrupt signals? A: The chip provides an interrupt output through the INT pin.
Q: What is the function of GPIO pins on the LAN9252I/ML? A: The GPIO pins are configurable for various functions like signaling, control, or status monitoring.
Q: Can I use the LAN9252I/ML for industrial automation applications? A: Yes, the chip is designed for industrial communication systems and embedded applications.
Q: What clock inputs are supported by the LAN9252I/ML? A: The chip supports an external reference clock input via the REFCLK pin.
Q: How does the LAN9252I/ML support Ethernet communication? A: It uses standard Ethernet protocols through its TX/RX data pins and handles data frames.
Q: What is the function of the CRSDV pin? A: The CRSDV pin indicates carrier sense and data validity in Ethernet communication.
Q: Is the LAN9252I/ML compatible with both 3.3V and 5V systems? A: The chip operates at 3.3V, and interfacing with 5V systems may require level-shifting.
Q: Can the LAN9252I/ML be used with both 100Base-TX and Gigabit Ethernet? A: Yes, it supports both 100Base-TX and Gigabit Ethernet standards.
Q: What is the maximum operating temperature range for the LAN9252I/ML? A: The device operates within the industrial temperature range of -40°C to 85°C.
Q: Does the LAN9252I/ML require external components? A: Yes, external components such as a crystal oscillator or external PHY may be required.
Q: How is the LAN9252I/ML powered? A: It is powered through the VDD pin, with ground connected to the VSS pin.
Q: How do I connect the LAN9252I/ML to a PHY? A: Use the MDIO and MDC pins for management and the RX/TX pins for data communication with the PHY.
Q: Is the LAN9252I/ML suitable for automotive applications? A: It is not specifically designed for automotive applications, but it can be used in various embedded systems.
Q: What is the data transfer rate of the LAN9252I/ML? A: The chip supports data transfer rates up to 1 Gbps (Gigabit Ethernet).
Q: Can I use the LAN9252I/ML in a multi-drop Ethernet network? A: Yes, it can be used in Ethernet networks with multiple devices connected via switches or hubs.
Q: Does the LAN9252I/ML support full-duplex communication? A: Yes, it supports full-duplex Ethernet communication.
Conclusion
The LAN9252I/ML is a highly flexible Ethernet controller that supports various communication speeds and provides numerous configuration options through its GPIO pins and management interfaces. It is widely used in industrial Ethernet applications and other embedded systems requiring reliable Ethernet connectivity. Make sure to refer to the official datasheet for detailed electrical and functional specifications.
