Gosuncn Technology Group Co. Ltd. GM500U1A Manual De Usuario
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16
GM500_U1A
Hardware Development Guide
Figure 2–1 Pin Assignment
NOTE:
Keep all NC pins unconnected.
2.3. P
IN
D
ESCRIPTION
The following table shows the IO Parameters Definition.
Table 2-1 IO Parameters Definition
Type
Description
IO
Bidirectional input/output
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
OD
Open drain
The logic levels are described in the following table.
Table 2-2 Logic levels Description
Parameter
Min
Max
Unit
VIH
0.65*VDD_IO
VDD_IO+0.3
V
VIL
-0.3
0.35* VDD_IO
V
VOH
VDD_IO-0.45
VDD_IO
V
VOL
0
0.45
V
NOTE:
VDD_IO is the voltage level of pins.
The following tables show the GM500_U1A’s pin definition.
Table 2-3 Pin Description
Power Supply
Pin Name
Pin NO.
I/O
Description
DC Characteristics
Comment
V_BAT
50.51
PI
Power supply for
module
Vmax = 4.2V
Vmin = 3.4V
Vnorm = 3.8V
It must be able to provide sufficient
current in a transmitting burst which
typically rises to 2.0A
VREF_1V8
5
PO
Provide 1.8V for
external circuit
Vnorm = 1.8V
Imax = 300mA
Power supply for external GPIO’S pull
up circuits
PLL_1V8
4
PO
Provide 1.8V for
external circuit
Vnorm = 1.8V
Imax = 20mA
This pin can only be used for WiFi
interface, and can left
unconnected when not used.
interface, and can left
unconnected when not used.
GND
3,9,11,20,21,31,36,
46,49,52, 61,63,78,
Ground