ENC28J60
FIGURE 1-2:
MCU
I/O
SDO
SDI
SCK
CS
SI
SO
SCK
TX/RX
Buffer
MAC
PHY
LEDA
LEDB
TYPICAL ENC28J60-BASED INTERFACE
ENC28J60
TPIN+/-
TPOUT+/-
ETHERNET
TRANSFORMER
RJ45
INT
INT
X
TABLE 1-1:
Pin Name
PINOUT I/O DESCRIPTIONS
Pin Number
Pin
Type
P
Buffer
Type
—
Description
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.
Ground reference.
Programmable clock output pin.
(1)
INT interrupt output pin.
(2)
Reserved function; always leave unconnected.
Data out pin for SPI interface.
(2)
Data in pin for SPI interface.
(3)
Clock in pin for SPI interface.
(3)
Chip select input pin for SPI interface.
(3,4)
Active-low device Reset input.
(3, 4)
Ground reference for PHY RX.
Differential signal input.
Differential signal input.
Bias current pin for PHY. Must be tied to ground via a resistor (refer to
for details).
Positive supply for PHY TX.
Differential signal output.
Differential signal output.
Ground reference for PHY TX.
Positive 3.3V supply for PHY RX.
Positive 3.3V supply for PHY PLL.
Ground reference for PHY PLL.
Ground reference for oscillator.
Oscillator input.
Oscillator output.
Positive 3.3V supply for oscillator.
LEDB driver pin.
(5)
LEDA driver pin.
(5)
Positive 3.3V supply.
SPDIP,
SOIC, SSOP
1
QFN
25
V
CAP
V
SS
CLKOUT
INT
NC
SO
SI
SCK
CS
RESET
V
SSRX
TPIN-
TPIN+
RBIAS
2
3
4
5
6
7
8
9
10
11
12
13
14
26
27
28
1
2
3
4
5
6
7
8
9
10
P
O
O
O
O
I
I
I
I
P
I
I
I
—
—
—
—
—
ST
ST
ST
ST
—
ANA
ANA
ANA
V
DDTX
TPOUT-
TPOUT+
V
SSTX
V
DDRX
V
DDPLL
V
SSPLL
V
SSOSC
OSC1
OSC2
V
DDOSC
LEDB
LEDA
V
DD
Legend:
Note 1:
2:
3:
4:
5:
15
16
17
18
19
20
21
22
23
24
25
26
27
28
11
12
13
14
15
16
17
18
19
20
21
22
23
24
P
O
O
P
P
P
P
P
I
O
P
O
O
P
—
—
—
—
—
—
—
—
ANA
—
—
—
—
—
I = Input, O = Output, P = Power, DIG = Digital input, ANA = Analog signal input, ST = Schmitt Trigger
Pins have a maximum current capacity of 8 mA.
Pins have a maximum current capacity of 4 mA.
Pins are 5V tolerant.
Pins have an internal weak pull-up to V
DD
.
Pins have a maximum current capacity of 12 mA.
DS39662B-page 4
Preliminary
©
2006 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
