Sch
e
ma
tic
a
nd
La
yo
uts
2016
Micr
ochip T
e
ch
nol
ogy
I
n
c.
DS
50002449A
-page 29
FIGURE A-4:
BOARD SCHEMATIC 4 OF 4
VDDL_EN
3.3V
AVDDH
3.3V
VDDIO
3.3V
5.0V
AVDDL
DVDDL
VDDL
VDDL
3.3V
5.0V
3.3V_U2
5.0V
3.3V
VDDL
DC_IN_EXT
5V_HDR
EXT_GND
DC_IN
3.3V
3.3V_U2
3.3V
SIGD
(3)
GND
Place GND test points evenly across PCB.
GND
GND
GND
KSZ8061 Power
3.3V Power for KSZ8061MNX
VOUT = 1.24 X [ 1 + ( R114 / R115 ) ]
VOUT = 1.25 X [ 1 + ( R112 / R113 ) ]
VDDL Power for KSZ8061MNX
Open: Regulator enabled
Closed: Regulator controlled by SIGD pin of KSZ8061
3.3V Power for Second PHY (KSZ8081MNX)
Jumper
Closed: Second PHY (KSZ8081) is powered
Open: Second PHY is unpowered
3.3V
VDDL
2.1mm Power
Jack
VOUT = 1.24 X [ 1 + ( R117 / R118 ) ]
Power source options:
DC_IN_EXT (J26) must be used for EMC testing.
5V_HDR (J44) may be used in non-EMC environment.
DC_IN_EXT:
Nominal: 5V
Maximum: 13V or limited by attached MII board
Jumper
Closed: KSZ8061 is powered
Open: KSZ8061 is unpowered
When using terminal block (3.3V only),
1. Remove JP1 and JP4 to disable LDOs U4 and U5.
2. Install R98.
TP1
TP1
C5
2.2uF
C5
2.2uF
D2
LED - RED SMD
D2
LED - RED SMD
2
1
FB4
FBEAD
FB4
FBEAD
1
2
+
C1
220uF / 50V Elect
+
C1
220uF / 50V Elect
JP4
JUMPER
JP4
JUMPER
R115
1.50K
R115
1.50K
FB3
FBEAD
FB3
FBEAD
1
2
C6
1uF
C6
1uF
U6
MIC5305_adj / MQF
U6
MIC5305_adj / MQF
EN
1
GN
D
2
VIN
3
VOUT
4
ADJ
5
BYP
6
+
C28
10uF Tant
+
C28
10uF Tant
JP1
JUMPER
JP1
JUMPER
C25
10uF
C25
10uF
JP2
JUMPER
JP2
JUMPER
J8
PWRJACK-TH
J8
PWRJACK-TH
1
3
2
R114
2.49K
R114
2.49K
FB1
FBEAD
FB1
FBEAD
1
2
R94
opt
R94
opt
+
C15
10uF Tant
+
C15
10uF Tant
JP3
3X1
JP3
3X1
1
2
3
TP3
TP3
C56
1uF
C56
1uF
R99
4.7K
R99
4.7K
C60
2.2uF / 50V
C60
2.2uF / 50V
R117
2.49K
R117
2.49K
C54
1uF
C54
1uF
C58
1uF
C58
1uF
U5
MIC29302WU / TO-263-5
U5
MIC29302WU / TO-263-5
EN
1
VIN
2
GN
D
3
VOUT
4
ADJ
5
R116
220
R116
220
R112
1.50K
R112
1.50K
+
C19
10uF Tant
+
C19
10uF Tant
R46
4.7K
R46
4.7K
U4
MIC29302WU / TO-263-5
U4
MIC29302WU / TO-263-5
EN
1
VIN
2
GN
D
3
VOUT
4
ADJ
5
R98
opt
R98
opt
R95
opt
R95
opt
TP2
TP2
R89
4.7K
R89
4.7K
+
C13
10uF Tant
+
C13
10uF Tant
TP12
TP12
TP4
TP4
J9
Term_Block_2
J9
Term_Block_2
1
2
C2
0.1uF
C2
0.1uF
R113
26.7K
R113
26.7K
+
C84
22uF Tant
+
C84
22uF Tant
L1
TDK ZJYS81
L1
TDK ZJYS81
1
2
4
3
C27
10uF
C27
10uF
TP33
TP33
FB2
FBEAD
FB2
FBEAD
1
2
C72
1uF
C72
1uF
C77
2.2uF / 50V
C77
2.2uF / 50V
C81
1uF
C81
1uF
+
C14
10uF Tant
+
C14
10uF Tant
R118
1.50K
R118
1.50K
+
C85
22uF Tant
+
C85
22uF Tant
C83
1uF
C83
1uF