Neoway N720 - Page 17

N720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 9
UIM_CLK
37
DO
UIM clock
1.8 V USIM:
V
OL
max = 0.45 V;
V
OH
min = 1.35 V
3V USIM:
V
OL
max = 0.4 V
V
OH
min = 2.6 V
1.8 V/3 V
UIM_DETECT
39
DI
UIM detect
V
IL
min = -0.3 V;
V
IL
max = 0.63 V
1.8 V
USB
VBUS
40
PI
USB voltage test
3.3 V~5.2 V,
typically 5 V
Used for firmware download and data
transmission
Differential trace for DM and DP with 90 Ω
impedance
USB_DM
41
IO
USB data negative
signal
USB2.0
USB_DP
42
IO
USB data positive
signal
USB2.0
USB _ID
43
AI
Identify host and
device
1.8 V
Leave this pin unconnected if it is not used.
Audio (Optional)
PCM_CLK
9
IO
PCM clock signal
V
OL
max=0.45V;
V
OH
min=1.35V
1.8V
The audio function is optional. It requires
PCM, I2C, and I2S_MCLK signals. Leave
these pins unconnected if they are not used.
PCM_DOUT
10
DO
PCM data output
V
OL
max=0.45V;
V
OH
min=1.35V
1.8V
PCM_DIN
11
DI
PCM data input
V
IL
min=-0.3V;
V
IL
max=0.45V;
V
IH
min=1.6V;
1.8V