LTE-A Module Series
EM12-G Hardware Design
EM12-G_Hardware_Design 24 / 62
LDO_IN
C1
C2
MIC29302WU
U1
IN
OUT
E
N
G
N
D
A
D
J
2
4
1
3
5
VCC
100nF
C3
470uF
C4
100nF
R2
100K 1%
51K 1%
R3
470uF
470R
51K
R4
R1
MCU_POWER
_ON/OFF
47K
4.7K
R5
R6
C5
C6
33pF
10pF
TVS
D1
Figure 5: Reference Design of Power Supply
In order to avoid damages to the internal flash, please do not switch off the power supply directly when
the module is working. It is suggested that the power supply can be cut off after pulling down
FULL_CARD_POWER_OFF# for about 100ms.
3.4. Turn on and off Scenarios
3.4.1. Turn on the Module
Driving the FULL_CARD_POWER_OFF# pin to a high level will power on the module. The following table
shows the definition of FULL_CARD_POWER_OFF#.
Table 6: Definition of FULL_CARD_POWER_OFF# Pin
Pin Name
Pin No.
Description
DC Characteristics
Comment
FULL_CARD
_POWER_
OFF#
6
A signal to control power-on/-off
of the module. When it is at low
level, the module powers off.
When it is at high level, the
module powers on.
V
IH
max=4.4V
V
IH
min=0.7V
V
IL
max=0.5V
Pulled down
internally.
NOTE