Datasheet

LAN8740A/LAN8740Ai
DS00001987A-page 14  2013-2015 Microchip Technology Inc.
TABLE 2-6: ANALOG REFERENCE PINS
Num Pins Name Symbol Buffer Type Description
1 External 1%
Bias Resistor
Input
RBIAS AI This pin requires connection of a 12.1 kΩ (1%)
resistor to ground.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
Note: The nominal voltage is 1.2 V and the
resistor will dissipate approximately
1 mW of power.
TABLE 2-7: POWER PINS
Num Pins Name Symbol Buffer Type Description
1 +1.8 V to +3.3 V
Variable I/O
Power
VDDIO P +1.8 V to +3.3 V variable I/O power.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
1 +1.2 V Digital
Core Power
Supply
VDDCR P Supplied by the on-chip regulator unless config-
ured for regulator off mode via the REGOFF
con-
figuration strap.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
Note: 1 µF and 470 pF decoupling capaci-
tors in parallel to ground should be
used on this pin.
1 +3.3 V Channel
1 Analog Port
Power
VDD1A P +3.3 V Analog Port Power to Channel 1.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
1 +3.3 V Channel
2 Analog Port
Power
VDD2A P +3.3 V Analog Port Power to Channel 2 and the
internal regulator.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
1 Ground VSS P Common ground. This exposed pad must be con-
nected to the ground plane with a via array.