Quectel EC20 Circuit Diagrams

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Radom.XIANG
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Quectel Wireless Solutions
PROJECT
SIZE
TITLE
VER
87
1.0
DATE
2015/3/30
EC20 Reference Design
A2
SD Design
Notes:
1. The RC circuit on SD lines is recommended to be reserved for adjust.
2. Route SD lines with 50ohm trace impedance.
3. Total routing length < 100mm is recommended.
4. Spacing to all other signals with more than 2x line width.
5. The parasitic capacitance of ESD components should be smaller than 15pF.
SD Design
C702
33pF
C701
0.1uF
R702
33R
R703
0R
R705
0R
R706 0R
R707
0R
R713
120K
D707
ESD9X3.3ST5G
R714
1K
CMD
DATA3
DATA2
DATA0
DATA1
VSS
VDD
CLK
DETECT
J701
SDCARD
G
S
D
Q701
SI2333CDS-T1
Q702
DTC043ZEBTL
R701
10K
C703
NM
C704
NM
C705
NM
C706
NM
C707
NM
C708
NM
R708
51K
R709
51K
R710
51K
R711
51K
R712
51K
R704 0R
D701
ESD9L5.0ST5G
D702 D703 D704 D705 D706
VDD_EXT
[1]
SD_INS_DET
[3,5]
VDD_3.0V
[2]
SD_PWR_EN
[1]
SD1_CLK
[1]
SD1_CMD
[1]
SD1_DATA3
[1]
SD1_DATA2
[1]
SD1_DATA1
[1]
SD1_DATA0
[1]
VDD_SDIO
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Quectel EC20 Specifications

General

Brand	Quectel
Model	EC20
Category	PCI Card
Language	English