Details

---

BUY LAN8740A-EN https://www.utsource.net/itm/p/12612268.html

Parameter	Description	Value
Device Type	High-Speed Ethernet Transceiver	-
Interface Standard	Supports 10BASE-T, 100BASE-TX, 1000BASE-T	-
Operating Voltage (Vcc)	Supply Voltage	3.3V ± 5%
Operating Temperature Range	Industrial Temperature Range	-40°C to +85°C
Data Rate	Maximum Data Rate	1 Gbps
Package Type	QFN Package	48-pin
Pin Pitch	Pin Spacing	0.5 mm
Dimensions	Package Size	7 mm x 7 mm
ESD Protection	Human Body Model (HBM)	±2 kV
Power Consumption	Typical Power Consumption	350 mW (1000BASE-T), 150 mW (100BASE-TX)
Standby Mode	Low Power Mode Current	< 50 μA
Wake-on-LAN	Wake-up Feature	Supported
LED Indicators	Status Indicators	Link, Activity, Speed, Full-Duplex
MDI/MDIX Support	Auto MDI/MDIX	Supported
Jumbo Frame Support	Maximum Frame Size	9 KB
EMC Compliance	Electromagnetic Compatibility	Meets EN 55022 Class B and IEC 61000-4-2, 4-3, 4-4, 4-5, 4-6, 4-8, 4-11
RoHS Compliance	Restriction of Hazardous Substances	Compliant

Instructions for Use

1. Power Supply:

   • Connect the 3.3V supply to the Vcc pin and ensure it is stable within ±5%.
   • Use appropriate decoupling capacitors (0.1 μF and 10 μF) close to the power pins to filter out noise.

2. Reset and Initialization:

   • Apply a reset signal to the RESET# pin to initialize the device.
   • The reset signal should be active low and held for at least 100 μs.

3. Configuration:

   • Configure the transceiver using the Management Data Input/Output (MDIO) interface.
   • Set the desired operating mode (10BASE-T, 100BASE-TX, 1000BASE-T) via the MDIO interface.

4. PHY Address:

   • The default PHY address is 0x00. If multiple devices are used on the same MDIO bus, configure unique addresses for each device.

5. Link Establishment:

   • The transceiver automatically negotiates the highest possible link speed with the connected device.
   • Monitor the LED indicators to confirm link status and activity.

6. Low Power Mode:

   • To enter low power mode, set the appropriate register bit via the MDIO interface.
   • The device will consume less than 50 μA in this mode.

7. Wake-on-LAN:

   • Enable the wake-on-LAN feature by setting the appropriate register bit.
   • The device can be woken up by a magic packet or a specific pattern of network traffic.

8. Jumbo Frames:

   • Enable jumbo frame support by configuring the maximum frame size to 9 KB via the MDIO interface.

9. MDI/MDIX:

   • The device supports auto MDI/MDIX, eliminating the need for crossover cables in most scenarios.

10. EMC Considerations:

    • Ensure proper PCB layout and grounding to minimize electromagnetic interference.
    • Follow the recommended PCB layout guidelines provided in the datasheet.

11. Storage and Handling:

    • Store the device in a dry, cool environment to prevent moisture damage.
    • Handle the device with ESD precautions to avoid damaging the sensitive components.

For detailed information, refer to the LAN8740A-EN datasheet and application notes provided by the manufacturer.

(For reference only)