Datasheet

ENC28J60
DS39662E-page 4 .  2006-2012 Microchip Technology Inc.
FIGURE 1-2: TYPICAL ENC28J60 BASED INTERFACE
TABLE 1-1: PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
SPDIP,
SOIC, SSOP
QFN
V
CAP 1 25 P — 2.5V output from internal regulator. A low Equivalent Series Resistance (ESR)
capacitor, with a typical value of 10 µF and a minimum value of 1 µF to ground,
must be placed on this pin.
V
SS 2 26 P — Ground reference.
CLKOUT 3 27 O — Programmable clock output pin.
(1)
INT 428O—INT interrupt output pin.
(2)
NC 5 1 O — Reserved function; always leave unconnected.
SO 6 2 O — Data out pin for SPI interface.
(2)
SI 7 3 I ST Data in pin for SPI interface.
(3)
SCK 8 4 I ST Clock in pin for SPI interface.
(3)
CS 9 5 I ST Chip select input pin for SPI interface.
(3,4)
RESET 10 6 I ST Active-low device Reset input.
(3,4)
VSSRX 11 7 P — Ground reference for PHY RX.
TPIN- 12 8 I ANA Differential signal input.
TPIN+ 13 9 I ANA Differential signal input.
RBIAS 14 10 I ANA Bias current pin for PHY. Must be tied to ground via a resistor (refer to
Section 2.4 “Magnetics, Termination and Other External Components”
for details).
V
DDTX 15 11 P — Positive supply for PHY TX.
TPOUT- 16 12 O — Differential signal output.
TPOUT+ 17 13 O — Differential signal output.
V
SSTX 18 14 P — Ground reference for PHY TX.
V
DDRX 19 15 P — Positive 3.3V supply for PHY RX.
V
DDPLL 20 16 P — Positive 3.3V supply for PHY PLL.
V
SSPLL 21 17 P — Ground reference for PHY PLL.
V
SSOSC 22 18 P — Ground reference for oscillator.
OSC1 23 19 I ANA Oscillator input.
OSC2 24 20 O — Oscillator output.
V
DDOSC 25 21 P — Positive 3.3V supply for oscillator.
LEDB 26 22 O — LEDB driver pin.
(5)
LEDA 27 23 O — LEDA driver pin.
(5)
V
DD 28 24 P — Positive 3.3V supply.
Legend: I = Input, O = Output, P = Power, ANA = Analog Signal Input, ST = Schmitt Trigger
Note 1: Pins have a maximum current capacity of 8 mA.
2: Pins have a maximum current capacity of 4 mA.
3: Pins are 5V tolerant.
4: Pins have an internal weak pull-up to V
DD.
5: Pins have a maximum current capacity of 12 mA.
TRANSFORMER
MCU
TX/RX
Buffer
MAC PHY
LEDA
LEDB
SI
SO
SCK
INT
SDO
SDI
SCK
INT
X
ENC28J60
TPIN+/-
TPOUT+/-
ETHERNET
RJ45
I/O
CS