Hardware Design

Smart Machine Smart Decision
SIM8200EA-M2 card Hardware Design _V1.01 21 2019-06-27
capacitor (ESR=0.7Ω).
In addition, in order to guard for over voltage protection, it is suggested to use a D1 diode to
protect the M.2 card.
Table 7: Recommended TVS diode list
No. Manufacturer Part Number VRWM Package
1 JCET ESDBW5V0A1 5V DFN1006-2L
2
Prisemi
PESDHC2FD4V5BH
4.5V
DFN1006-2L
3 WAYON WS05DPF-B 5V DFN1006-2L
4
WILL
ESD5611N
5V
DFN1006-2L
5 WILL ESD56151W05 5V SOD-323
6 WAYON WS4.5DPV 4.5V DFN1610-2L
3.1.2 Recommended Power Supply Circuit
It is recommended that a switching mode power supply or a linear regulator power supply is used.
It is important to make sure that all the components used in the power supply circuit can resist the
current which could be more than 4 A（TBD）.
The following figure shows the linear regulator reference circuit with 5V input and 3.3V output.
Vin
Vout
GND
FB
3
+
PWR_CTRL
R102
R101
VBAT
49.9K(1%)
30K(1%)
+
U101
MIC29302
5
4
1
2
C101 C102
100uF
1uF
DC INPUT
R103
470R
On/Off
FUSE
C103
330uF
C104
100nF
Figure 5: Linear regulator reference circuit
If there is a high dropout between input and VBAT, or the efficiency is extremely important, then a
switching mode power supply will be preferable. The following figure shows the switching mode
power supply reference circuit with 12V input and 3.3V output.
FUSE
Vin
Vout
FB
U101
1
2
3
4
5
LM2596- ADJ
+
100uH
MBR360
L101
C101
+
C102
D102
C103
R102
R101
330uF
VBAT
49.9K(1%)
30K(1%)
100uF
1uF
C104
100nF
DC INPUT
PWR_CTRL
GND
On/Off
Figure 6: Switching mode power supply reference circuit
Note: The Switching Mode power supply solution for VBAT must be chosen carefully against
SIMCom Confidential File