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Apalis Carrier Board Design Guide
Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l
l
Page | 23
drawn does not exceeds 10mA. The ETH1_ACT signal is used as reference for the ETH1_MDI3-
signal in the MXM3 connector, a strapping capacitor of 1nF should be placed to GND close to the
MXM3 connector.
2.4.2.1
Gigabit Ethernet Schematic Example (Integrated Magnetics)
All currently available Toradex Apalis modules do not require a center tap voltage. Only 100nF
capacitors are required on the center tap pins of the magnetics. Connecting the center tap signals
together can degrade the signal quality and is therefore not recommended. However, in order to
be compatible with any future modules which require a center tap voltage, we still recommend to
add the circuit below with non-assembled zero ohm resistors.
Figure 16: Gigabit Ethernet with integrated magnetics reference schematic
2.4.2.2
Gigabit Ethernet Schematic Example (Discrete Magnetics)
If discrete magnetics are used instead of a RJ-45 Ethernet jack with integrated magnetics, special
care has to be taken to route the signals between the magnetics and the jack. These signals are
required to be high-voltage isolated from the other signals. It is therefore necessary to place a
dedicated ground plane under these signals which has a minimum separation of 2mm from every
other signal and plane. Additionally, a separate shield ground for the LAN device is needed. Try to
place the magnetics as close as possible to the Ethernet jack. This reduces the length of the signal
traces between the magnetics and jack.
100nF
16V
C3
100nF
16V
C6
100nF
16V
C7
2A
220R@100MHz
L1
GND
150R
R2
150R
R1
SHIELD
MM70-314-310B1
ET
50
Apalis - Gigabit Ethernet
2 of 25
ETH1_MDI0-
48
ET
56
ETH1_MDI1-
54
ET
32
ETH1_MDI2-
34
ET
38
ETH1_MDI3-
40
ETH1_ACT
42
ETH1_LINK
44
ETH1_CTREF
46
X1B
ETH1_MDI0_N
ETH1_MDI1_P
ETH1_MDI1_N
ETH1_MDI2_P
ETH1_MDI2_N
ETH1_MDI3_P
ETH1_MDI3_N
ETH1_MDI0_P
ETH1_ACT
ETH1_LINK
ETH1_CTREF
L829-1J1T-43
CT0
12
D1+
4
D1-
5
D0+
11
D0-
10
CT1
6
C
13
A
14
C
15
A
16
1
2
3
6
yellow
green
orange
4 X 75R
1000pF 2kV
S
S
2
S
S
1
CT2
1
D2+
3
D2-
2
4
5
CT3
7
D3+
8
D3-
9
7
8
C
17
X2
ETH1_MDI0_N
ETH1_MDI1_P
ETH1_MDI1_N
ETH1_MDI2_P
ETH1_MDI2_N
ETH1_MDI3_P
ETH1_MDI3_N
ETH1_MDI0_P
ETH1_ACT
ETH1_LINK
ETH1_CTREF
ETH1_ACT_C
ETH1_LINK_C
ETH1_CTREF_1
ETH1_CTREF_0
ETH1_CTREF_2
ETH1_CTREF_3
ETH1_CTREF_0
ETH1_CTREF_3
ETH1_CTREF_2
ETH1_CTREF_1
0R
R4
0R
R5
100nF
16V
C5
100nF
16V
C2
ETH1[0..10]
0R
R6
0R
R7
GND
GND
GND
GND
3.3V_SW
3.3V_SW
ETH1_CTREF_ALL
150R
R3
NA
47uF
6.3V
+C4
GND
ETH1_LINK_GB
1nF
50V
C1
GND
NA
NA
NA
NA
NA
NA
NA