N21
Hardware User Guide
Copyright © Neoway Technology Co., Ltd. All rights reserved.
5
2.2 Pin Description
Table 2-1 lists the definition of IO types.
Table 2-1 IO definition
IO Type
DO Digital output, COMS logic level
DI
Digital input, COMS logic level
PO
Power output
PI
Power input
AO
Analog output
AI
Analog input
Level Feature
P1
1.8V/3.0V
1.8 V level feature:
V
IH
=1.26V~1.8V
V
IL
=-0.3V~0.36V
V
OH
=1.44V~1.8V
V
OL
=0V~0.4V
3.0 V level feature:
V
IH
=2V~3V
V
IL
=-0.3V~0.57V
V
OH
=2.28V~3V
V
OL
=0V~0.4V
P2
2.8V digital IO
V
IH min
=1.96V V
IL max
= 0.84V
V
OH min
=2.38V V
OLmax
=0.42V
P3
1.1V of V_RTC power domain
V
IH min
=0.68V V
IH max
= 1.41V
V
IL min
=-0.3V V
IL max
= 0.36V
Table 2-2 Pin Description
Signal
Pin I/O
Function
Level
Remarks
Power Supply Pins
VBAT
2, 3 PI
Main
power
input
V
max
=4.3V
VDDIO_2P8
17
PO
2.8V
power
output
V
norm
=2.8V
I
max
=50mA
Used only for level shifting.
Leave this pin floating if it is
not used.
GND
1, 4, 10, 21
Ensure that all GND pins are
