Hardware Development Guide of Module Product
16
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3.3
Feature of Interface Power Level
3.3.1
Feature of Digital Power Level Signal
Table 3-4 Power Level Range of Digital Signal
Signal
Description
Min
Max
Units
VIH
High level of
input voltage
0.65*VDD_PX 0.3
V
VIL
Low level of
input voltage
-0.3
0.35* VDD_PX V
VOH
High level of
output voltage
VDD_PX-0.45 VDD_PX
V
VOL
Low level of
output voltage
0
0.45
V
3.4
Power Interface
3.4.1
Description of Power PINs
Power VPH_PWR signal (PIN No: 23-26). This is the positive signal of 3.8V power
supply.
GND signal (PIN No: 2/12/14/31/36/38/44/47/54/63/66/69/71/78). This is the power
ground and signal ground of ZM5202, which needs to be connected to the ground
on the system board. If the GND signal is not connected completely, the
performance of ZM5202 will be affected. Besides, there are altogether 30
heat-dissipation wielding panel with PIN No. 79-108.
3.4.2
Requirement of Power Supply
The power supply is recommended to be within the range of 3.4~4.2V. If the
network is in poor situation, the antenna will transmit at the maximum power, and
the transient maximum peak current under 2G mode can reach as high as 2A. So
the power supply capacity for peak current needs to be ab ove 2.5A, and the
average peak current needs to be above 0.9A.
