Product Info

LTE Standard Module Series
EM05-G Hardware Design
EM05-G_Hardware_Design 28 / 69
LDO_IN
C1
C2
MIC29302WU U1
IN
OUT
EN
GND
ADJ
2 4
1 3 5
100 nF
C3
C4
100 nF
R2
R3
470R
51K
R4
R1
MCU_POWER_ON/OFF
47K
4.7K
R5
R6
C5
C6
33 pF
10 pF
TVS
D1
82K 1%
47K 1%
3.3V
470 μF
470 μF
Figure 8: Reference Circuit for the Power Supply
To avoid damaging internal flash, do not switch off the power supply when the module is working normally.
It is suggested that the power supply should be cut off after pulling down RESET# for about 100 ms.
3.3.3. Monitor the Power Supply
AT+CBC can be used to monitor the voltage value of VCC. For more details, see document [3].
3.4. Turn on
FULL_CARD_POWER_OFF# is used to turn on/off the module. When the input signal is asserted high (≥
1.19 V), the module will turn on.
This input signal is 3.3 V tolerant and can be driven by either 1.8 V or 3.3 V GPIO. Also, it has internally
pulled down with a 100 kΩ resistor.
NOTE