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LAN9252I-PT Detailed explanation of pin function specifications and circuit principle instructions

The LAN9252I/PT is a LAN9252 series Ethernet controller from Microchip Technology Inc. It is commonly used for industrial networking applications, such as Industrial Ethernet systems, and it supports EtherCAT (Ethernet for Control Automation Technology) protocols. Below is a comprehensive guide to the specifications and pin functions of the LAN9252I/PT along with detailed FAQs.

Packaging and Pinout of LAN9252I/PT

The LAN9252I/PT comes in a QFN-48 package, meaning it has 48 pins. Here's the complete breakdown of all 48 pins and their functions:

Pin # Pin Name Description 1 VDDIO I/O supply voltage (3.3V) 2 VSS Ground 3 VDD Power supply (3.3V) 4 SCLK SPI Clock input 5 MOSI SPI Master-Out-Slave-In 6 MISO SPI Master-In-Slave-Out 7 nCS Chip Select (Active Low) for SPI 8 RST Reset (Active Low) 9 RXD0 Receive Data (Ethernet) 10 RXD1 Receive Data (Ethernet) 11 TXD0 Transmit Data (Ethernet) 12 TXD1 Transmit Data (Ethernet) 13 MDIO Management Data I/O (MII/GMII) 14 MDC Management Data Clock 15 RX_ER Receive Error (Ethernet) 16 COL Collision Detect (Ethernet) 17 CRSDV Carrier Sense / Data Valid (Ethernet) 18 TX_EN Transmit Enable (Ethernet) 19 RXD2 Receive Data (Ethernet) 20 RXD3 Receive Data (Ethernet) 21 RXD4 Receive Data (Ethernet) 22 RXD5 Receive Data (Ethernet) 23 RXD6 Receive Data (Ethernet) 24 RXD7 Receive Data (Ethernet) 25 TXD2 Transmit Data (Ethernet) 26 TXD3 Transmit Data (Ethernet) 27 TXD4 Transmit Data (Ethernet) 28 TXD5 Transmit Data (Ethernet) 29 TXD6 Transmit Data (Ethernet) 30 TXD7 Transmit Data (Ethernet) 31 TX_CLK Transmit Clock (Ethernet) 32 RX_CLK Receive Clock (Ethernet) 33 INT Interrupt output 34 nINT Active low Interrupt 35 GPIO0 General-purpose I/O 36 GPIO1 General-purpose I/O 37 GPIO2 General-purpose I/O 38 GPIO3 General-purpose I/O 39 GPIO4 General-purpose I/O 40 GPIO5 General-purpose I/O 41 GPIO6 General-purpose I/O 42 GPIO7 General-purpose I/O 43 REFCLK Reference Clock input 44 RXD8 Receive Data (Ethernet) 45 RXD9 Receive Data (Ethernet) 46 TXD8 Transmit Data (Ethernet) 47 TXD9 Transmit Data (Ethernet) 48 VSS Ground

Pin Function FAQs

Q1: What is the purpose of the RST pin (Pin 8)?

A1: The RST pin is used to reset the LAN9252I/PT device. When this pin is driven low, the chip is reset and returns to its initial state.

Q2: How is the VDD pin (Pin 3) powered?

A2: The VDD pin should be supplied with a 3.3V power source to operate the LAN9252I/PT Ethernet controller.

Q3: What is the function of MOSI (Pin 5)?

A3: The MOSI (Master Out Slave In) pin is used for SPI communication. It sends data from the master to the slave.

Q4: What does the nCS (Pin 7) do?

A4: The nCS pin is the Chip Select pin for SPI communication. It should be pulled low to enable communication with the device.

Q5: What does the TX_CLK pin (Pin 31) provide?

A5: The TX_CLK pin outputs a clock signal for Ethernet data transmission.

Q6: What is the GPIO0 to GPIO7 used for?

A6: The GPIO pins (Pins 35-42) are general-purpose input/output pins. They can be configured for different digital functions like control, status monitoring, etc.

Q7: What is the role of the MDC (Pin 14) pin?

A7: The MDC pin provides the clock signal for the management data communication, such as for the MII/GMII Ethernet interface s.

Q8: How do the RXD and TXD pins relate to Ethernet data transmission?

A8: RXD pins (Pins 9-24) are used for receiving data on the Ethernet interface, while TXD pins (Pins 11-30) are used for transmitting data from the LAN9252I/PT.

Q9: What is the significance of the COL (Pin 16)?

A9: The COL pin detects Ethernet collisions. If two devices attempt to send data at the same time, a collision is indicated.

Q10: What does the CRSDV (Pin 17) pin represent?

A10: The CRSDV pin is used to indicate the carrier sense or whether valid data is being transmitted or received over the Ethernet interface.

Q11: How does VDDIO (Pin 1) differ from VDD (Pin 3)?

A11: VDD supplies the main operating power to the LAN9252I/PT, while VDDIO provides power to the I/O pins and logic circuits.

Q12: What is the function of the INT (Pin 33)?

A12: The INT pin is an interrupt output. It signals the host when an event or condition requires attention, such as an error or completion of a transaction.

Q13: How does the RX_ER (Pin 15) work in Ethernet transmission?

A13: The RX_ER pin indicates a receive error on the Ethernet interface, which might occur due to frame errors or CRC mismatches.

Q14: What is the role of the REFCLK pin (Pin 43)?

A14: The REFCLK pin is an input that provides the reference clock signal for the device to operate, often required for Ethernet or other high-speed communication interfaces.

Q15: What is the purpose of the VSS pins (Pins 2, 48)?

A15: The VSS pins provide the ground reference for the LAN9252I/PT.

Q16: Can the LAN9252I/PT work without the MDIO/MDC interface?

A16: No, the MDIO (Pin 13) and MDC (Pin 14) are essential for managing the Ethernet interface via the MII/GMII protocol.

Q17: How does TX_EN (Pin 18) work?

A17: The TX_EN pin enables the transmission of Ethernet data. It indicates when the Ethernet controller is ready to send data.

Q18: How do you reset the LAN9252I/PT?

A18: Resetting is done by pulling the RST pin low, which will reset the device to its initial configuration.

Q19: What happens when the nINT pin (Pin 34) is activated?

A19: The nINT pin signals an active interrupt condition, typically when an error or significant event occurs.

Q20: Is it possible to use the LAN9252I/PT in high-speed applications?

A20: Yes, the LAN9252I/PT is designed to handle high-speed Ethernet transmission and is suitable for applications requiring EtherCAT communication protocols.

This detailed explanation and FAQ list should cover all the necessary aspects of the LAN9252I/PT Ethernet controller’s pin functions and usage.