Neoway S720 Installation manual

Hardware User Guide
Issue 1.1

S720 Hardware User Guide
Copyright
Copyright © Neoway Technology Co., Ltd. All rights reserved.
ii
Copyright © Neoway Technology Co., Ltd 2022. All rights reserved.
No part of this documentmaybe reproduced or transmitted in any form or by anymeans without prior written
consent of Neoway Technology Co., Ltd.
is the trademark of Neoway Technology Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
This document provides guide for users to use S720.
This document is intended for system engineers (SEs), development engineers, and test engineers.
THIS GUIDE PROVIDES INSTRUCTIONS FOR CUSTOMERS TO DESIGN THEIR APPLICATIONS.
PLEASE FOLLOW THE RULES AND PARAMETERS IN THIS GUIDE TO DESIGN AND COMMISSION.
NEOWAY WILL NOT TAKE ANY RESPONSIBILITY OF BODILY HURT OR ASSET LOSS CAUSED BY
IMPROPER OPERATIONS.
THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE DUE TO
PRODUCT VERSION UPDATE OR OTHER REASONS.
EVERY EFFORT HAS BEEN MADE IN PREPARATION OF THIS DOCUMENT TO ENSURE ACCURACY
OF THE CONTENTS, BUT ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS
DOCUMENT DO NOT CONSTITUTE A WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.
Neoway provides customers complete technical support. If you have any question, please contact your
account manager or email to the following email addresses:
[e-mail]
[e-mail]
Website: http://www.neoway.com

S720 Hardware User Guide
Contents
Copyright © Neoway Technology Co., Ltd. All rights reserved.
iii
Contents
About This Document..................................................................................ix
1 Safety Recommendations ...................................................................... 11
2 About S720.............................................................................................12
2.1 Product Overview....................................................................................................................... 12
2.2 Block Diagram............................................................................................................................ 13
2.3 Basic Features ........................................................................................................................... 14
3 Reference Standards .............................................................................17
4 Module Pins ...........................................................................................18
4.1 Pin Layout .................................................................................................................................. 18
4.2 Pin Description........................................................................................................................... 19
5 Application Interfaces.............................................................................31
5.1 Power Interfaces ........................................................................................................................ 31
5.1.1 VBAT.................................................................................................................................. 31
5.1.2 Charging and Battery ........................................................................................................ 35
5.1.3 Power Output..................................................................................................................... 37
5.1.4 VRTC................................................................................................................................. 39
5.2 Control Interfaces....................................................................................................................... 39
5.2.1 Startup............................................................................................................................... 40
5.2.2 Shutdown........................................................................................................................... 42
5.2.3 Volume up/down................................................................................................................ 43
5.3 Peripheral Interfaces.................................................................................................................. 44
5.3.1 USB ................................................................................................................................... 44
5.3.2 UART................................................................................................................................. 46
5.3.3 USIM.................................................................................................................................. 50
5.3.4 SD...................................................................................................................................... 52
5.3.5 I2C..................................................................................................................................... 54
5.4 Audio Interface........................................................................................................................... 55
5.4.1 Analog Audio Input ............................................................................................................ 55
5.4.2 Analog Audio Output.......................................................................................................... 56
5.4.3 Headphone........................................................................................................................ 58
5.5 Video Interfaces ......................................................................................................................... 60
5.5.1 LCD ................................................................................................................................... 60
5.5.2 TP...................................................................................................................................... 64
5.5.3 Camera.............................................................................................................................. 65
5.6 RF Interface ............................................................................................................................... 68
5.6.1 ANT_MAIN/ANT_DRX Antenna Interface ......................................................................... 68
5.6.2 ANT_WIFI/BTAntenna Interface....................................................................................... 70
5.6.3 ANT_GNSS Antenna Interface.......................................................................................... 70
5.6.3.1 Reference Design of Active GNSS Antenna .................................................................. 70

S720 Hardware User Guide
Contents
Copyright © Neoway Technology Co., Ltd. All rights reserved.
iv
5.6.3.2 Reference Design of Passive GNSS Antenna ............................................................... 71
5.6.4 Antenna Assembling.......................................................................................................... 72
5.7 GPIO Interfaces ......................................................................................................................... 75
5.8 Multi-Function Interfaces............................................................................................................ 76
5.9 Other Interfaces ......................................................................................................................... 77
5.9.1 ADC ................................................................................................................................... 77
5.9.2 USB_BOOT....................................................................................................................... 78
5.9.3 Motor Driver....................................................................................................................... 78
6 Electrical Characteristics and Reliability.................................................80
6.1 Electrical Characteristics............................................................................................................ 80
6.2 Temperature Characteristics...................................................................................................... 80
6.3 ESD Protection........................................................................................................................... 81
7 RF Characteristics..................................................................................82
7.1 Operating Bands ........................................................................................................................ 82
7.2 TX Power and RX Sensitivity..................................................................................................... 83
7.3 GNSS Technical Parameters ..................................................................................................... 83
7.4 WLAN/BT Characteristics .......................................................................................................... 84
8 Mechanical Characteristics.....................................................................85
8.1 Dimensions................................................................................................................................. 85
8.2 Label........................................................................................................................................... 86
8.3 Packing....................................................................................................................................... 86
8.3.1 Tray.................................................................................................................................... 86
8.3.2 Moisture............................................................................................................................. 88
9 Mounting................................................................................................89
9.1 PCB Package............................................................................................................................. 89
9.2 Application Foot Print................................................................................................................. 90
9.3 Stencil......................................................................................................................................... 90
9.4 Solder Paste............................................................................................................................... 91
9.5 SMT Oven Temperature Profile.................................................................................................. 91

S720 Hardware User Guide
Figures
Copyright © Neoway Technology Co., Ltd. All rights reserved.
v
Figures
Figure 2-1 Block diagram................................................................................................................. 13
Figure 4-1 S720 pin definition (top view) ......................................................................................... 18
Figure 5-1 Power supply recommended design 1 ........................................................................... 32
Figure 5-2 Power supply recommended design 2 ........................................................................... 33
Figure 5-3 Power supply recommended design 3 ........................................................................... 33
Figure 5-4 Power supply recommended design 4 ........................................................................... 34
Figure 5-5 Reference design of the battery connection................................................................... 37
Figure 5-6 Reference design of the VRTC power supply ................................................................ 39
Figure 5-7 Reference design of startup controlled by a button........................................................ 40
Figure 5-8 Reference design of startup controlled by an MCU........................................................ 40
Figure 5-9 Reference design of automatic start once powered up.................................................. 41
Figure 5-10 Startup process............................................................................................................. 42
Figure 5-11 S720 forcibly shutdown process................................................................................... 43
Figure 5-12 Reference design of the volume up/down control connection...................................... 43
Figure 5-13 Reference design of USB Micro interface (with OTG function) connection ................. 45
Figure 5-14 Reference design of UART connection ........................................................................ 46
Figure 5-15 Recommended level conversion circuit 1..................................................................... 47
Figure 5-16 Recommended level conversion circuit 2..................................................................... 48
Figure 5-17 Recommended level conversion circuit 3..................................................................... 49
Figure 5-18 Reference design of the USIM card (with hot-swap) interface..................................... 50
Figure 5-19 Reference design of the USIM card (without hot-swap) interface................................ 51
Figure 5-20 Reference design of the SD card (with hot-swap) interface......................................... 53
Figure 5-21 Reference design of the I2C connection ...................................................................... 54
Figure 5-22 Main/auxiliary sisonic MIC (MEMS) reference design.................................................. 55
Figure 5-23 Main/auxiliary electret MIC (ECM) reference design.................................................... 56
Figure 5-24 Recommended design of the EAR/SPK interface........................................................ 57
Figure 5-25 Reference design of the headphone circuit (CTIA)...................................................... 59

S720 Hardware User Guide
Figures
Copyright © Neoway Technology Co., Ltd. All rights reserved.
vi
Figure 5-26 Headphone interface diagram ...................................................................................... 59
Figure 5-27 LCD reference design................................................................................................... 62
Figure 5-28 Reference design of the backlight................................................................................ 63
Figure 5-29 TP interface example.................................................................................................... 65
Figure 5-30 Reference design of 2-lane camera interface connection............................................ 67
Figure 5-31 L-type network .............................................................................................................. 68
Figure 5-32 T-type network .............................................................................................................. 69
Figure 5-33 π-type network.............................................................................................................. 69
Figure 5-34 Recommended RF PCB design ................................................................................... 70
Figure 5-35 GNSS RF structure....................................................................................................... 70
Figure 5-36 GNSS active antenna reference design....................................................................... 71
Figure 5-37 Reference design of passive GNSS antenna............................................................... 72
Figure 5-38 Murata RF connector encapsulation specifications...................................................... 73
Figure 5-39 RF cable connections................................................................................................... 73
Figure 5-40 Antenna layout.............................................................................................................. 74
Figure 5-41 Layout around the antenna........................................................................................... 74
Figure 5-42 Reference design of USB force download ................................................................... 78
Figure 5-43 Reference design of the motor interface ...................................................................... 79
Figure 8-1 S720 Top and side view dimensions (unit: mm)............................................................. 85
Figure 8-2 S720 label....................................................................................................................... 86
Figure 8-3 Tray package.................................................................................................................. 87
Figure 8-4 Tray................................................................................................................................. 88
Figure 9-1 Bottom view of S720 package (unit: mm)....................................................................... 89
Figure 9-2 Top view of S720 package (unit: mm) ............................................................................ 90
Figure 9-3 Oven temperature profile................................................................................................ 91

S720 Hardware User Guide
Tables
Copyright © Neoway Technology Co., Ltd. All rights reserved.
vii
Tables
Table 2-1 Variants and frequency bands.......................................................................................... 12
Table 2-2 Basic features of S720..................................................................................................... 14
Table 4-1 IO definition and DC characteristics................................................................................. 19
Table 4-2 Pin description.................................................................................................................. 20
Table 5-1 Charging interface pinout................................................................................................. 36
Table 5-2 Power output description.................................................................................................. 37
Table 5-3 Control interface definitions.............................................................................................. 39
Table 5-4 USB interface description................................................................................................. 44
Table 5-5 UART interface pinouts .................................................................................................... 46
Table 5-6 USIM interface pinouts..................................................................................................... 50
Table 5-7 SD interface pinouts......................................................................................................... 52
Table 5-8 I2C interface pinouts ........................................................................................................ 54
Table 5-9 Analog audio input interface pinouts................................................................................ 55
Table 5-10 Analog audio output interface pinouts............................................................................ 56
Table 5-11 Headphone interface pinouts.......................................................................................... 58
Table 5-12 LCD interface pinouts..................................................................................................... 60
Table 5-13 TP interface pinouts ....................................................................................................... 64
Table 5-14 Camera interface pinouts............................................................................................... 65
Table 5-15 RF antenna interface pinouts......................................................................................... 68
Table 5-16 GPIO interface description............................................................................................. 75
Table 5-17 Pin definition description ................................................................................................ 76
Table 5-18 ADC interface pinout ...................................................................................................... 78
Table 5-19 USB_BOOT interface description .................................................................................. 78
Table 5-20 Motor driver interface description................................................................................... 78
Table 6-1 S720 operating conditions................................................................................................ 80
Table 6-2 S720 temperature characteristics .................................................................................... 80
Table 6-3 S720 ESD protection characteristics................................................................................ 81

S720 Hardware User Guide
Tables
Copyright © Neoway Technology Co., Ltd. All rights reserved.
viii
Table 7-1 S720 operating bands...................................................................................................... 82
Table 7-2 S720 TX power and RX sensitivity description ................................................................ 83
Table 7-3 GNSS Technical parameters............................................................................................ 83
Table 7-4 S720 WLAN/BTTX power and RX sensitivity................................................................... 84

S720 Hardware User Guide
About This Document
Copyright © Neoway Technology Co., Ltd. All rights reserved.
ix
About This Document
Scope
This document is applicable to the S720 series.
It defines the features, indicators, and test standards of the S720 module and provides reference for
the hardware design of each interface.
Audience
This document is intended for system engineers (SEs), development engineers, and test engineers.
Change History
Issue
Change
Changed By
1.0
Initial release.
Yin Xiaoliang
1.1
Changed the typical value of VBAT to 3.6 V.
Yin Xiaoliang
Conventions
Symbol
Indication
Indicates danger or warning. This information must be followed. Otherwise, a
catastrophic module or user device failure or bodily injury may occur.
Indicates caution. This symbol alerts the user to important points about using the
module. If these points are not followed, the module or user device may fail.
Indicates instructions or tips. This symbol provides advices or suggestions that
may be useful when using the module.

S720 Hardware User Guide
About This Document
Copyright © Neoway Technology Co., Ltd. All rights reserved.
x
Related Documents
Neoway_S720_Datasheet
Neoway_S720_Product_Specifications
Neoway_S720_EVK_User_Guide

S720 Hardware User Guide
Chapter 1 Safety Recommendations
Copyright © Neoway Technology Co., Ltd. All rights reserved.
11
1 Safety Recommendations
Ensure that this product is used in compliance with the requirements of the country and the
environment. Please read the following safety recommendations to avoid body hurts or damages of
product or workplace:
Do not use this product at any places with a risk of fire or explosion such as gasoline stations, oil
refineries, and so on.
If the product is used in a place with flammable gas or dust such as propane gas, gasoline, or
flammable spray, the product will cause an explosion or fire.
Do not use this product in environments such as hospital or airplane where it might interfere with
other electronic equipment.
If the product is used in medical institutions or on airplanes, electromagnetic waves emitted by
this product may interfere with surrounding equipment.
Follow the requirements below in design and use of the application for this module:
Do not disassemble the module without permission from Neoway. Otherwise, we are entitled to
refuse to provide further warranty.
Design your application correctly by referring to the HW design guide document and our review
feedback on your PCB design. Connect the product to a stable power supply and lay out traces
following fire safety standards.
Avoid touching the pins of the module directly in case of damages caused by ESD.
Do not insert/remove a USIM card or move a memory card from the module while it is still
switched on.

S720 Hardware User Guide
Chapter 2 About S720
Copyright © Neoway Technology Co., Ltd. All rights reserved.
12
2 About S720
S720 is a smart cellular module developed based on the quad-core SOC platform, supporting LTE-
FDD, LTE-TDD,WCDMA, and GSM communications, as well as GNSS, Bluetooth 4.2, andWi-Fi 2.4G.
It supports various peripheral interfaces including touch panel, camera, MIC, speaker, headphone,
keyboard, and USB 2.0.
2.1 Product Overview
Figure 2-1 lists the variant and frequency bands that S720 supports.
Table 2-1 Variants and frequency bands
Variant
Region
Category
Band
GNSS
Wi-Fi
BT
CA
China
Cat 4
LTE-FDD: B1/B3/B5/B8
LTE-TDD:
B34/B38/B39/B40/B41
WCDMA: B1/B5/B8
GSM: 900/1800MHz
Supported
Supported
Supported
EA
Europe
Cat 4
LTE-FDD:
B1/B3/B5/B7/B8/B20/B28
LTE-TDD: B38/B40/B41
WCDMA: B1/B5/B8
GSM: 850/900/1800MHz
Supported
Supported
Supported
S720 runsAndroid 10 OS and has dimensions of (40.50±0.1) mm ×(40.50±0.1) mm ×(2.85±0.2) mm.
Thereare274pinsonthemoduleand theirpads areintroducedin 146-pinLCC +128-pinLGApackage.
Applicable to smart POS, smart gateway, video surveillance, driving recorder, DVR, vehicle payment
equipment, law enforcement equipment, smart handheld device, smart wearable device, vending
machine, logistics cabinet and other terminals, S720 can meet the requirements for high speed and
multimedia functions in industrial and consumer applications.

S720 Hardware User Guide
Chapter 2 About S720
Copyright © Neoway Technology Co., Ltd. All rights reserved.
13
2.2 Block Diagram
S720 consists of the following functionality units:
Baseband
Crystal
Power management unit
LPDDR3 + eMMC memory
Digital interfaces (USB/USIM/UART/I2C/Camera/SDIO3.0/LCD/TP)
Analog interfaces (Audio/ADC)
RF section (2G/3G/4G antenna/GNSS antenna/2.4G Wi-Fi&Bluetooth antenna)
Figure 2-1 Block diagram
RF front-end module
Transceiver
Baseband
eMCP
LPDDR3
eMMC
USB2.0 USIM*2 CAM*2 I2C UART GPIOsSDIO
ANT_DIV ANT_GNSSANT_MAIN ANT_WIFI/BT
VBAT
PWRKEY
ADC
26 MHz
TSX
26 MHz
32 kHz
SAW
Audio
TP LCM
Power
manager
26 MHz
LAN
32 kHz
VDD_SDIO
VDD_SD
USIM1_VDD
USIM2_VDD
VDD1V85
VDD28
VDDCAMIO
VDDCAMA
VDDCAMCORE
VDDCAMMOT
SAW
Diplexer

S720 Hardware User Guide
Chapter 2 About S720
Copyright © Neoway Technology Co., Ltd. All rights reserved.
14
2.3 Basic Features
Table 2-2 Basic features of S720
Parameter
Description
Physical features
Dimensions: (40.50±0.1) mm ×(40.50±0.1) mm ×(2.85±0.2) mm
Weight: about 10.4 g
Package: 146-pin LCC + 128-pin LGA
Temperature ranges
Operating: -30°C to +75°C
Storage: -40°C to +90°C
Operating voltage (DC)
VBAT: 3.5 V- 4.2 V, typical value: 3.6 V
Operating current (DC)
Sleep mode1): TBD
Idle mode2): TBD
Certification approval
CCC*, SRRC*
Platform Features
Application processor
Quad-core 64-bit ARM Cortex-A53 processor, main frequency up to
1.4 GHz.
GPU
Mali-T820 MP1 GPU, frequency up to 680 MHz
Operating System
Android 10
Storage
1 GB LPDDR3 + 8 GB eMMC (default)
2 GB LPDDR3 + 16 GB eMMC (optional)
RF Characteristics
Wireless rate
GPRS: Max 107 kbps (DL)/Max 85.6 kbps (UL)
EDGE: Max 296 kbps (DL)/Max 236.8 kbps (UL)
WCDMA: HSDPA, Max 42 Mbps (DL)/Max 11.2 Mbps (UL)
FDD-LTE: Cat4, Max 150 Mbps (DL)/Max 50 Mbps (UL)
TDD-LTE: Cat4, Max 130 Mbps (DL)/Max 35 Mbps (UL)
Transmit power
EGSM900: 33 dBm+1/-3 dB (Power Class 4)
DCS1800: 30 dBm+1/-3 dB (Power Class 1)
EDGE 900 MHz: 27 dBm±3 dB (Power Class E2)
EDGE 1800 MHz: 26 dBm±3 dB (Power Class E2)
WCDMA: 24 dBm+1/-3 dB (Power Class 3)
FDD-LTE: 23 dBm+1/-3 dB (Power Class 3)
TDD-LTE: 23 dBm+1/-3 dB (Power Class 3)
Satellite positioning
GPS/BDS/GLONASS
Antenna Interfaces
2G/3G/4G antenna, 4G diversity reception antenna, GNSS antenna,
and 2.4G Wi-Fi/BT antenna
All of each has a characteristic impedance of 50 Ω.

S720 Hardware User Guide
Chapter 2 About S720
Copyright © Neoway Technology Co., Ltd. All rights reserved.
15
Multimedia
Display interface
One 4-lane MIPI_DSI interface, with a maximum speed of 1.5
Gbps/lane
Resolution up to HD+(1440x720)@60fps
Camera interfaces
Two MIPI_CSI interfaces, with a maximum speed of 1.5 Gbps/lane
2-lane MIPI used by the rear camera, resolution up to 8 MP
1-lane MIPI used by the front camera, resolution up to 2 MP
Video encoding and
decoding
Encoding: H.264/H.263/MPEG4 - 1080p@30fps
Decoding: H.264/H.263/MPEG4/VP8 - 1080p@30fps
Graphics engine
Mali-T820 MP1 GPU, 3D high-performance graphics engine with a
frequency up to 680 MHz
Audio
Audio format
GSM-FR, GSM-EFR, GSM-HR, AMR, AMR-NB, AMR-WB, EVS-NB,
EVS-WB, EVS-SWB, MP3, AAC, AAC+, PCM
Audio input
Three MICs, one main MIC, one auxiliary MIC, one headphone MIC
Audio output
Class AB stereo headphone output
Class AB differential earpiece output
Class D differential loudspeaker amplifier output
Connection Features
UART
One 4-pin UART interface supporting hardware flow control. Two 2-
pin UART interfaces, of which the Debug UART is only used for
commissioning. Their frequency can reach up to 2 Mbit/s.
I2C
Four I2C interfaces, used in camera, touch panel, sensor, and other
peripherals
USIM
Two (U)SIM interfaces
Supports (U)SIM card: 1.8 V and 3.0 V
Supports duals card dual standby
USB
One high-speed USB 2.0 interface
Supports USB 2.0 high-speed mode and USB OTG; can be used for
data transmission, software debug, and software update
SDIO
One SDIO interface, supporting SD3.0 protocol and 1.8 V/3.0 V SD
card
ADC
One ADC interface supports a sampling resolution up to 12 bits;
voltage detection range: 0.1 V - 1.2 V.
WLAN
Supports AP mode and STA mode
2.4 GHz frequency band, supporting 802.11 b/g/n and the rate up to
72.2 Mbps
Bluetooth
BLE 4.2 or earlier version

S720 Hardware User Guide
Chapter 2 About S720
Copyright © Neoway Technology Co., Ltd. All rights reserved.
16
Debug Interface
Forcible download mode
Forcible USB startup control
* indicates in development.
"Sleep mode1)": The module enters flight mode and disables all RF functions.
"Idle mode2)": The module enters a low power consumption state. In this state, the peripheral interface of the
module is disabled, but the radio frequency (RF) function is normal. The module will exit the idle mode when
there is an incoming call or text message, and will re-enter the idle mode when the incoming call or voice call
ends.

S720 Hardware User Guide
Chapter 3 Reference Standards
Copyright © Neoway Technology Co., Ltd. All rights reserved.
17
3 Reference Standards
S720 is designed by referring to the following standards:
3GPP TS 36.521-1 V10.0.0 User Equipment(UE) conformance specification; Radio transmission
and reception
3GPP TS 21.111 V9.0.0 USIM and IC card requirements
3GPP TS 31.102 V9.19.0 Characteristics of the Universal Subscriber Identity Module (USIM)
application
3GPP TS 31.111 V9.12.2 Universal Subscriber Identity Module (USIM) Application Toolkit
(USAT)

S720 Hardware User Guide
Chapter 4 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
18
4 Module Pins
There are 274 pins on S720 and their pads are introduced in 146-pin LCC + 128-pin LGA package. It
supports interfaces including USB, MIPI, SDIO, UART,ADC, I2C and so on.
4.1 Pin Layout
The following figure shows the pad layout of S720.
Figure 4-1 S720 pin definition (top view)
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
38
146
145
144
124
123
122
121
120
119
118
117
116
115
114
113
112
111
143
142
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
125
110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74
147
187
222
221
220
219
218
217
216
215
214
176
148
188
223
250
249
248
247
246
245
244
213
175
186
185
184
183
182
181
180
179
178
177
150
190
225
252
271
265
242
211
173
151
191
226
253
264
241
210
172
149
189
224
251
270
269
268
267
266
243
212
174
153
193
228
255
262
239
208
170
154
194
229
256
257
258
259
260
261
238
207
169
152
192
227
254
263
240
209
171
156
196
197
198
199
200
201
202
203
204
205
167
157
158
159
160
161
162
163
164
165
166
155
195
230
231
232
233
234
235
236
237
206
168
274
272
273
POWER GND UART OTHER ANT RESERVED USB
AUDIO SD CAMERA LCM GPIO TP SIM

S720 Hardware User Guide
Chapter 4 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
19
4.2 Pin Description
The following table lists the IO definitions and DC characteristics.
Table 4-1 IO definitionand DC characteristics
IO Type
B
Digital input/output, CMOS logic level
DO
Digital output, CMOS logic level
DI
Digital input, CMOS logic level
PO
Power output
PI
Power input
AO
Analog output
AI
Analog input
AIO
Analog input/output
Level Feature
Interface type
Power domain
Logic level
USIM
P1: 1.8 V/3.0 V self-adaptive
1.8 V level feature:
VIH =0.7*VUSIM~VUSIM
VIL =0V~0.3VUSIM
VOH=0.9*VUSIM~VUSIM
VOL=0V~0.1VUSIM
3V level feature:
VIH =0.7*VUSIM~VUSIM
VIL =0V~0.3VUSIM
VOH=0.9*VUSIM~VUSIM
VOL=0V~0.1VUSIM
SDIO
P2: 1.8 V/3.0 V self-adaptive
1.8 V level feature:
VIH =0.7*VSDIO~VSDIO
VIL =0V~0.3VSDIO
3V level feature:
VIH =0.7*VSDIO~VSDIO
VIL =0V~0.3VSDIO

S720 Hardware User Guide
Chapter 4 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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VOH=0.9*VSDIO~VSDIO
VOL=0V~0.1*VSDIO
VOH=0.9*VSDIO~VSDIO
VOL=0V~0.1*VSDIO
GPIO
P3: 1.85 V
VIH =0.7*VIO~VIO
VIL =0V~0.3VIO
VOH=0.9*VIO~ VIO
VOL=0V~0.1*VIO
Table 4-2 Pin description
Signal
Pin
I/O type
Function description
Level feature
Remarks
Power Interfaces
VBAT_BB
1, 2
PI
Power input of the module
baseband
Vmin = 3.5 V
Vnorm = 3.6 V
Vmax = 4.2 V
Providing at least 3 A current to VBAT is
required.
VBAT_RF
145, 146
PI
Power input of the module RF
Vmin = 3.5 V
Vnorm = 3.6 V
Vmax = 4.2 V
VDD1V85
111
PO
1.85 V power output
Vnorm = 1.85 V
Imax = 100 mA
Used only for pull-up or level conversion.
It is always on.
Leave this pin floating if it is not used.
VDD28
129
PO
2.8 V power output
Power supply for LCM and sensor
Vnorm = 2.8 V
Imax = 150 mA
Add a bypass capacitor (1.0 μF- 2.2 μF)
externally when using this pin.
It is always on to supply power.
Leave this pin floating if it is not used.
VDDCAMIO
125
PO
1.8 V power output
I/O power supply for cameras,
sensors and other peripherals
Vnorm = 1.8 V
Imax = 200 mA
Add a bypass capacitor (1.0 μF- 2.2 μF)
externally when using this pin.
Leave this pin floating if it is not used.