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SIM5320JE-TE_Hardware Design_V1.01
2012-07-10
21
3
Application Interface Specification
3.1
Power Supply
The power supply range of SIM5320JE-TE is from 3.3V to 4.2V. For the VBAT, the ripple due to
GSM/GPRS emission burst (every 4.615ms
）
may cause voltage drop, and the current consumption rises
typically to peak of 2A. So the power supply must be able to provide sufficient current up to 2A. The
following figure is the VBAT voltage ripple wave at the maximum power transmit phase.
The test condition: VBAT =4.0V, VBAT maximum output current =2A, C
A
=100 µF tantalum capacitor
(ESR=0.7
Ω
) and C
B
=1µF.
Figure
9
: VBAT voltage drop during burst emission (GSM/GPRS)
3.1.1
Power Supply Pin
The VBAT pins are dedicated to connect the supply voltage.
Table 5: Pin description
Pin type
Pin name
Min
Typ
Max
Unit
POWER
VBAT
3.3
3.8
4.2
V
Note: When the module is power off, users must pay attention to the issue about current leakage. Refer to Chapter 3.10.2
Note2.
3.1.2
Design Guide
Mostly, user connects the VBAT pins with one power supply. Make sure that the input voltage at the
VBAT pin will never drop below 3.3V even during a transmit burst when the current consumption rises up
to 2A. If the power voltage drops below 3.3V, the module may be shut down automatically. Using a large
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