KSZ8851 Eval Board Schematics

5
4
3
2
KSZ8851SNL (32-pin) Demo Board Black Diagram
REVISION HISTORY
DATE:
Headers 5x2
D
RJ45
04/21/10
Reset
T
KSZ8851SNL
STATUS LEDs
Power
+1.8V
+2.5V
+3.3V
EEPROM
AT93C46
Crystal
25 MHz
C
C
KSZ8851SNL Demo Board
with SPI Interface
T
LED3
U3
(MIC5209YM)
Header 5x2
JP 2/3
U1
KSZ8851SNL
Crystal
1.1
LED2
JP 4/5/6
RJ-45
Removed JP3 for EESK strapping option
Add JP3 for connection between VDD_IO and 1.8V
(if VDD_IO is 1.8V)
Changed the LED pulled up to 3.3V
Add 4.7K pull up on SO pin
Reset
B
LED1
1.0
1st Demo Board Design
MIC5209YM
x 2
DEMO BOARD PLACEMENT
U2
(EEPROM)
REVISION
DESCRIPTION
D
12/07/07
LAN1
1
B
Table of Contents
Page 1: Revision History & Block Diagram
Page 2: KSZ8851SNL 32-pin Ethernet Controller Chip
2.25"
U4
(MIC5209YM)
A
A
3.75"
MICREL SEMICONDUCTOR
Title
KSZ8851SNL DEMO BOARD
MICREL SEMICONDUCTOR CONFIDENTIAL
5
4
3
2
Size
B
Document Number
Block and Revision History
Date:
Wednesday, April 21, 2010
Rev
1.1
Sheet
1
1
of
2
5
4
TP1
1.8A
VDD
TP2
FB1
1
C1
+
0.1uF
D
VDD_IO
2
TP3
C5
1.8V
0.1uF
2
1
FBEAD
C6
1.8A
3.3VA
1.8V
VDD_IO
FB3
1
C4
+
1
3.3V
FB2
C3 FBEAD
C2
2
VDD_IO 3.3VA
+ C7
C9
1 JP3
2
FBEAD
C8
+
C10
C11
2
JP3 -> ON: VDD_IO=1.8V;
OFF: VDD_IO=2.5/3.3V
C12
0.1uF 0.01uF
4.7uF
VDD
D
4.7uF 0.1uF 0.01uF
0.1uF 0.1uF
4.7uF
R1
4.7uF
3.3VA
T1
R29
R4
49.9
0
C13
0.1uF
16
11
RXP1
RXM
12
RXM1
RXP
28
SCLK
TXP
14
TXP1
33
31
SI
TXM
15
TXM1
33
26
CSN
27
SO
R11
R12
33
VDD
R6
33
R8
C
VDD_A3.3
HEADER 5X2
9
U1
25
30
Series resistors 33 ohm
are not required if the
CPU is driving the SPI
interface to KSZ8851M at
the same board
VDD_IO
VDD_IO
GND
SCLK
SI
CSN
SO
2
4
6
8
10
VDD_A1.8
1
3
5
7
9
49.9
VDD_CO1.8
VDD_D1.8
5.0V_IN
RSTN
PME
INTRN
GND
4.7K
5
23
JP1
R14
8
9
RX1P
7
10
R5
6
11
RX1M
3
14
TX1P
2
15
R7
1
16
TX1M
C15
KSZ8851SNL
INTRN
LED2
220
R20
2
10K
33
2
2
R21
PME
RSTN
+ C18
10uF
LED0
LED1
1
32
LED0
LED1
EECS
EESK
EED_IO
10
7
6
EECS
EESK
EED_IO
ISET
17
R22
X1
20
X2
21
R13
49.9
R15
49.9
Vin_5.0V
C23
47uF
0.1uF
1
EN
C29
+
3
3
ADJ
4
1
2
3
4
C21
22PF
C26
R27
470pF
2.49K
C25
10uF
1
CS
SK
DI
DO
VCC
NC
ORG
GND
8
7
6
5
2
U5
GND
VDD
4
2.46K
R31
5.54K
R32
1 JP4
2 3.3V
1 JP5
2 2.5V
1 JP6
2 1.8V
VDD_IO Option
C30
R33
470pF
2.49K
2
1 JP2
2
R28
6 RXM1
GND
VR
D2
5 3.3VA
.
.
2 RX1M
.
2 TX1M
GBLC03C_0
D3
TX1P 1
4.7K
TXP1 3
Strapping Options:
.
.
4 TXM1
.
GBLC03C_0
SRV05-4
JP2 (EED_IO) -> ON: EEPROM present; OFF: EEPROM not present
ESD protection is required for POE application
(Parts are not designed on this demo board)
C27
C28
+
TANT
ADJ
5
6
7
8
GND
GND
GND
GND
EN
R30
.
ON: EEPROM present
U4
1.50K
B
.
RX1P 1
VDD is 3.3V if only JP4 is ON
VDD is 2.5V if only JP5 is ON
VDD is 1.8V if only JP6 is ON
MIC5209YM
1
Place SIGNAL_GND return of
this cap close to SIGNAL_GND
at 5V input power to board
0.1uF
VDD
A
CHASSIS_GND
220
R26
Vin_5.0V
3
SIGNAL_GND
C19
Power 3.3V
0.1uF (red LED)
VOUT = 1.24 X [ 1 + ( 2.49k/ 1.5K ) ]
OUT
1000pF / 2kV
LED3
1.50K C24
+
EED_IO
IN
1000pF / 2kV
C17
LINK/ACT
LINK
VDD
U2
RXP1 1
R25
22uF
2
P1LED0
(LINK=LED ON)
(ACT= LED Blink)
(100BT=LED ON)
AT93C46 SO8
OUT
TANT
FBEAD
C22
+
IN
GND
GND
GND
GND
2
4
LEDSEL0
P1LED1
(bit9 in CGCR)
0
100BT
1
ACT
LEDx2
Green LEDs
MIC5209YM
2
1
C
3.3V
5
6
7
8
TANT
1
2
C16
3.01K (1%)
U3
FB4
B
Digikey 399-3443-1-ND 1808
3.3V
LED1
220
R16
220
R18
Y1
C20
22PF
5.0V_IN TP4
75
10uF
25MHZ Crystal
8
13
18
19
R23
DGND
DGND
DGND
DGND
33
Reset
1
3
AGND
AGND
AGND
PME ON (green LED)
4
22
24
29
S1
2
4
1
R10
75
0.1uF
R19
1N4148
R9
Pulse H1102
R24
R17
D1
1
2
3
4
5
6
7
8
75
0
1
3
75
C14
+
3.3V
33
J1
RJ-45 Jack
10
9
R3
4.7K
R2
4.7K
5.0V_IN
CHASSIS_GND
1.8V
3
A
10uF
0.1uF
MICREL SEMICONDUCTOR
Title
KSZ8851SNL DEMO BOARD
5
4
3
2
Size
B
Document Number
KSZ8851SNL
Date:
Thursday, April 22, 2010
Rev
1.1
Sheet
1
2
of
2