EVB8720 SMSC, EVB8720 Datasheet - Page 3

• Manufacturer Part Number: EVB8720
• Description: Ethernet Modules & Development Tools LAN8720 Design BRD
• Manufacturer: SMSC

Specifications of EVB8720

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

EVB8720 Evaluation Board User Manual
SMSC EVB8720
2 Board Details
2.1
2.1.1
2.1.2
2.1.3
Power
This section includes the following EVB8720 board details:
+5V Power
Power is normally supplied to the EVB8720’s +3.3V regulator externally via the +5V power pins of the
40-pin connector. If desired, the EVB8720 can be powered without +5V present on the 40-pin
connector (P1) by supplying +5V to the TP2 (red) test point with ground connected to pin 20 of the J1
header.
Note: Before connecting an external power supply to TP2, ensure power is not present on the 40-
VDDIO Power
The LAN8720A’s VDDIO power may be supplied at a voltage other than +3.3V by depopulating resistor
R12 and supplying +1.6V to +3.6V externally via test point TP5 (purple), with ground connected to pin
20 of the J1 header.
Note: Before connecting an external power supply to TP5, ensure that resistor R12 has been
+1.2V Power
The LAN8720A’s internal +1.2V regulator can be optionally disabled. Refer to
+1.2V Regulator Configuration (REGOFF)," on page 7
Power
Configuration
Mechanicals
pin connector’s +5V pins. Connecting +5V simultaneously via the 40-pin connector and TP2
may result in permanent damage to the board.
removed. Connecting an external power supply to TP5 while resistor R12 is populated may
result in permanent damage to the board.
USER MANUAL
3
for additional information.
Section 2.2.4, "Internal
Revision 1.1 (05-24-10)