SIM28 reference design with passive antenna(with external LNA and SAW)

SIM28 reference design with passive antenna(with external LNA and SAW)
5
6
4
1
2
3
D
D
SIM28 reference design with passive antenna for best performance (with external LNA and SAW)
U101
19
R2 100R
TXD
20
R3 100R
RXD
21
D1 1
RB521S-30
1
VGPS_3V3
2
2
B
1
(2.3V--4.3V)
23
24
NC5
NC4
SDA
TXD1
SCL
RXD1
TXD
NC1
RXD
EINT0
V_BACKUP
TIMEMARK
VCC
SCS
GND3
NC0
GND
GND
GND
U102
6 RFOUT
GND 1
5 SHDN
GND 2
C
C101
8
7
C1
6
1uF
10nF
R205 1K
5
4
D203
2
DTC143ZE
VGPS_3V3
J102
4 VCC
%,$6
2
1
LED-1
1
Optional
Q201
C2
1
L101 5.6nH
RFIN 3
2
3
SMA_A
RF
TVS6
1uF
B101
D201
4.7UF
IN
1
2
VCC_RF
9
3
VCC_RF
OUT
10
5
GND0
SCLK
4
B
2
TVS2
LED-1C104
22
MISO
R1 0R
11
GND
5
GND
4
GND
3
GND
2
18
RF_IN
BGU7005
12
1
17
MOSI
GND1
2
TVS4
TVS3
16
SIM28 Module
3
15
GND2
1
14
TVS5
13
C
Passive antenna
VCC_RF
SAFEB1G57KE0F00R14
SAFEB1G57KE0F00R14U103
U103
R207
1K
Note: 1. SIM28 does not support charging function to the backup battery,
if a rechargable backup battery used,customer should design the charge circuit.
2. The load-cap of TVS6 should be less than 5pF(Optional)
SIM Technology
A
DRAWN BY
PROJECT
A
TITLE
SIM28 REF design
CHECKED BY
SIZE
VER
SHEET
6
5
4
3
2
1
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