N27 Hardware User Guide
Chapter 3 Module Pins
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16
3.2 Pin Description
Table 3-1 lists the definition of IO types
Table 3-1 IO definition
IO Type
B
Digital input/output, COMS logic level
DO
Digital output, COMS logic level
DI
Digital input, COMS logic level
PO
Power output
PI
Power input
AO
Analog output
AI
Analog input
AIO Analog input/output
Level Feature
P3
1.8V digital IO power domain
V
IH min
=1.2V, V
IL max
= 0.3V
V
OH min
=1.35V, V
OLmax
=0.45V
P4
3.3V power supply of USB_PHY core
V
typ
=3.3V
Table 3-2 Pin description
Signal
Pin
I/O
Function
Level Feature
Remarks
Power Interface
VBAT
2, 3
PI
Main power
input
V
min
=3.1V,
V
max
=4.3V,
V
typ
=3.6V
Peak current is up to 3A
VDDIO_1P8
47
PO
1.8V
power
output
V
norm
=1.8V
I
max
=50 mA
Used only for level shifting and
IO power supply.
Leave this pin floating if it is not
used.
GND
1, 4, 10, 22, 32, 46, 58, 60, 67, 70, 72, 73, 74,
75, 76
Ensure that all GND pins are
connected to the ground plane
Control Interfaces
PWRKEY_N
52
DI
ON/OFF
button
P3
Connected to 1.8V through an
internal pull-up resistor
