The part number "LAN91C111I-NU" you have mentioned refers to a specific component from Nuvoton Technology, which is known for producing integrated circuits (ICs) related to networking and communications. Specifically, the LAN91C111I-NU is an Ethernet controller, part of the LAN91 series.
Key Specifications and Pinout Description
This IC is typically found in a LQFP-100 (Low-Profile Quad Flat Package) package, which means it has 100 pins. Below is a detailed explanation of the pins, their functions, and additional FAQs.
Pinout Table (100 Pins) Pin No. Pin Name Description 1 VDD Power supply for the chip (3.3V typically). 2 VSS Ground pin. 3 TXD0 Transmit data line 0 (Ethernet TX). 4 TXD1 Transmit data line 1 (Ethernet TX). 5 TXD2 Transmit data line 2 (Ethernet TX). 6 TXD3 Transmit data line 3 (Ethernet TX). 7 TX_EN Transmit enable (Ethernet TX). 8 RXD0 Receive data line 0 (Ethernet RX). 9 RXD1 Receive data line 1 (Ethernet RX). 10 RXD2 Receive data line 2 (Ethernet RX). 11 RXD3 Receive data line 3 (Ethernet RX). 12 RX_DV Receive data valid (Ethernet RX). 13 RX_ER Receive error (Ethernet RX). 14 CRS_DV Carrier sense / receive data valid (Ethernet RX). 15 MDC Management data clock (for PHY management interface ). 16 MDIO Management data input/output (for PHY management interface). 17 INT Interrupt signal output (used to signal processor about events). 18 RESET Reset input pin (used to reset the chip). 19 B0 External bus interface pin 0 (used for addressing). 20 B1 External bus interface pin 1 (used for addressing). 21 B2 External bus interface pin 2 (used for addressing). 22 B3 External bus interface pin 3 (used for addressing). 23 B4 External bus interface pin 4 (used for addressing). 24 B5 External bus interface pin 5 (used for addressing). 25 B6 External bus interface pin 6 (used for addressing). 26 B7 External bus interface pin 7 (used for addressing). 27 A0 External bus interface address pin 0. 28 A1 External bus interface address pin 1. 29 A2 External bus interface address pin 2. 30 A3 External bus interface address pin 3. 31 A4 External bus interface address pin 4. 32 A5 External bus interface address pin 5. 33 A6 External bus interface address pin 6. 34 A7 External bus interface address pin 7. 35 RD Read signal (used for external memory operations). 36 WR Write signal (used for external memory operations). 37 CS Chip select signal (used to activate the chip). 38 OE Output enable signal (used for memory output). 39 RSTOUT Reset output signal. 40 VSS Ground pin. 41–100 Additional pins for data, control, power, and other interface functions specific to the LAN91C111I-NUNote: The exact pinout can vary slightly based on the version of the component and the specific configuration, but the general layout should be similar to the one above.
FAQs (Frequently Asked Questions)
Q: What is the LAN91C111I-NU used for? A: The LAN91C111I-NU is an Ethernet controller used for network communication. It facilitates the connection of devices to a network via Ethernet.
Q: How many pins does the LAN91C111I-NU have? A: The LAN91C111I-NU comes in a 100-pin package.
Q: What is the operating voltage for the LAN91C111I-NU? A: The LAN91C111I-NU operates at a voltage of 3.3V.
Q: What type of package does the LAN91C111I-NU come in? A: It comes in an LQFP-100 package, which has 100 pins arranged in a square layout.
Q: What is the pin function of TXD0 to TXD3? A: TXD0 to TXD3 are the transmit data lines used to send Ethernet data from the controller to the network.
Q: What is the function of RXD0 to RXD3? A: RXD0 to RXD3 are the receive data lines used to receive Ethernet data from the network.
Q: How does the RESET pin work? A: The RESET pin is used to reset the Ethernet controller. When activated, it restarts the internal operation of the chip.
Q: What is the function of the CRSDV pin? A: The CRSDV pin is used to indicate carrier sense or receive data validity on the Ethernet interface.
Q: What are the uses of the MDIO and MDC pins? A: The MDIO and MDC pins are used for communication with the PHY (Physical Layer) via the Management Data Interface (MDI) for configuration and control.
Q: How is the LAN91C111I-NU reset? A: The LAN91C111I-NU is reset by applying a low signal to the RESET pin.
Q: Can the LAN91C111I-NU be used with both 10Mbps and 100Mbps Ethernet? A: Yes, the LAN91C111I-NU supports both 10Mbps and 100Mbps Ethernet speeds.
Q: What is the function of the INT pin? A: The INT pin is used to signal an interrupt to the processor, indicating that the Ethernet controller has an event that requires attention.
Q: How is the LAN91C111I-NU powered? A: The LAN91C111I-NU is powered by a 3.3V supply connected to the VDD pin.
Q: What are the pin configurations for the external bus interface? A: The external bus interface is configured with pins such as B0 to B7 for addressing and data communication, and pins like RD, WR, and CS for read/write and chip select signals.
Q: Is there any error indication for the received data? A: Yes, the RX_ER pin is used to indicate receive errors during data reception.
Q: What does the TXEN pin do? A: The TXEN pin enables the transmission of data on the Ethernet network.
Q: Can the LAN91C111I-NU be used in embedded systems? A: Yes, the LAN91C111I-NU is commonly used in embedded systems that require Ethernet connectivity.
Q: What is the function of the OE pin? A: The OE (Output Enable) pin is used to enable or disable the output buffer for data communication.
Q: How is data read from the LAN91C111I-NU? A: Data is read from the LAN91C111I-NU via the RD (Read) pin in conjunction with the external bus interface.
Q: Can I use the LAN91C111I-NU in a custom PCB design? A: Yes, the LAN91C111I-NU can be used in custom PCB designs, ensuring that the proper pinout and power requirements are met.
This detailed guide should give you an in-depth understanding of the LAN91C111I-NU Ethernet controller's pinout, functions, and commonly asked questions.
