Neoway N720 OpenLinux - Table 2-2 Pin Description

N720 OpenLinux
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
8
P4
SDC interface voltage,
compatible with 1.8V/2.85V
1.8V Voltage
Feature:
V
IH
=1.27V~2V,
V
IL
= -0.3V~0.58V
V
OH
=1.4V~1.8V,
V
OL
=0V~0.45V
2.85V Voltage
Feature:
V
IH
=1.8V~3.15V,
V
IL
= -0.3V~0.7V
V
OH
=2.1V~2.85V,
V
OL
=0V~0.36V
P7
GPIO of PM chipset can be
divided into three types: 1.2V,
1.8V, and VBAT. They are
used for output because their
IO cannot adapt automatically.
V
IH
=0.65*V
IO
~(V
IO
+0.3V),
V
IL
=-0.3V~0.35*V
IO
V
OH
=(V
IO
-0.45)V~V
IO
V
OL
=0V~0.45V
(V
IO
is GPIO voltage, 1.2V/1.8V/VBAT)
When V
IO
is 1.8V
High: 0.9mA
Medium: 0.6mA
Low: 0.15 mA
P8
Level of GPIO for power
management chipset, fixed to
1.8V
V
IH
=1.26V~2.1V
V
IL
=-0.3V~0.63V
V
OH
=1.35V~1.8V
V
OL
=0V~0.45V
High: 0.9mA
Medium: 0.6mA
Low: 0.15 mA
Table 2-2 Pin Description
Signal
Pin
I/O
Function
Level
Feature
Remarks
Power Interface
VBAT
27, 28,
29
PI
Main power supply input
V
max
=4.3V
Supply at most 2A
DVDD_1P8
45
PO
1.8V power output
V
norm
=1.8V
I
max
=50mA
Used only for level
shifting.
Leave this pin
floating if it is not
used.
DVDD_XO_1P8
53
PO
1.8V power output
V
norm
=1.8V
I
max
=20mA
Used to pull up the
crystal oscillator of
external WLAN
module
Leave this pin
floating if it is not
used.