N27 Hardware User Guide
Chapter 3 Module Pins
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19
resistor.
USIM_CLK
8
DO
SIM
card
clock
P3
USIM_RESET
9
DO
SIM
card
reset
P3
USIM_DET
5
DI
SIM detect
P3
USB Interface
USB_VBUS
29
PI
Charging
voltage
check
4.75V~5.25V
Typical value:
5.0V
The interface complies with the
USB2.0 standard.
USB_DM
30
AIO
USB
data
negative
signal
USB_DP
31
AIO
USB
data
positive
signal
USB_VDD_3P3
28
PO
Power supply
for
the
USB_PHY
P4
Do not use it.
Leave this pin floating.
USB_VDD_3P3_
EN
27
B
P3
Reserved
Leave this pin floating.
ADC Interface
ADC2
1
20
AI
Analog-to-
digital signal
conversion
V
max
=1.7V;
V
min
=0.1V
Software (open) version: used
as ADC4. 15-bit, detectable
voltage ranging from 0.1V to
1.7V.
Leave this pin floating if it is not
used.
ADC4
1
21
AI
Analog-to-
digital signal
conversion
V
max
=1.7V;
V
min
=0.1V
Software (open) version: used
as ADC2. 15-bit, detectable
voltage ranging from 0.1V to
1.7V.
Leave this pin floating if it is not
used.
I2C Interface
I2C2_SCL
1
12
B
I2C clock
P3
Software (open) version: used
as I2C2_SCL. Connect it to
1.8V by using an external 2.2
kΩ pull-up resistor. Leave this
pin floating if it is not used.
