Fibocom SC126 Installation instructions

SC126
Hardware Guide
V1.2

Disclaimer
This document serves as the user guide of the product. Customers shall design their
products according to the information provided in the document. Fibocom shall not be
liable for any damages caused by failure to comply with the relevant operations, design
specifications or safety rules. Due to product version update or other reasons, Fibocom
reserves the rights to modify any information in this document at any time without prior
notice and without any responsibility. Unless otherwise specified, all the statements,
information and suggestions contained in the document do not constitute any explicit or
implicit guarantee.
Copyright Statement
Copyright ©2022Fibocom Wireless Inc. All rights reserved.
Unless specifically authorized by Fibocom, the recipient of the document shall keep the
received documents and information confidential and shall not use it for any purpose
other than the implementation and development of this project. Without the prior written
permission of the copyright holder, any company or individual is prohibited to excerpt,
copy any part of or the entire document, or distribute the document in any form. For any
violation of confidentiality obligations, unauthorized use or malicious use of the
document and information in other illegal forms, Fibocom has the rights to pursue legal
responsibility.
Trademark Statement
The trademark is registered and owned by Fibocom Wireless Inc.
Other trademarks, product names, service names, and company names appearing in this
document are the properties of their respective owners.

Contact
Website: https://www.fibocom.com
Address: Floor 10-14, Block A, Building 6, Shenzhen International Innovation Valley,
Dashiyi Road, Xili Community, Xili Street, Nanshan District, Shenzhen
Tel: [phone]
Safety Instruction
Do not operate wireless communication products in areas where use of radio is not
recommended without proper equipment certification. These areas include environments
where radio interference may occur, such as flammable and explosive environments, and
medical equipment, aircraft, or any other equipment that may be subject to any form of
radio interference.
Any driver or operator of a vehicle must not operate a wireless communication product
while controlling the vehicle. Doing so will reduce the driver's control and operation of
the vehicle, posing a safety risk.
The wireless communication product does not guarantee a valid connection under any
circumstances, for example, when the (U)SIM is in arrears or invalid. In case of emergency,
use the emergency call function in power-on state, and make sure the equipment is in an
area with sufficient signal strength.

Contents
Copyright © Fibocom Wireless Inc. 1
Contents
Applicable Models.............................................................................................4
Change History..................................................................................................5
1 Foreword .........................................................................................................6
1.1 Description ..................................................................................................................... 6
1.2 Reference Standards.................................................................................................... 6
2 Product Overview...........................................................................................8
2.1 General Description ..................................................................................................... 8
2.2 Main Performance........................................................................................................ 9
2.3 Function Block Diagram............................................................................................13
2.4 Pin Definition................................................................................................................15
2.4.1 Pin Distribution .....................................................................................................15
2.4.2 Pin Description......................................................................................................16
3 Application Interfaces..................................................................................30
3.1 Power Supply ...............................................................................................................30
3.1.1 Power input............................................................................................................30
3.1.2 VRTC.........................................................................................................................32
3.1.3 VPH_PWR................................................................................................................33
3.1.4 Power output.........................................................................................................33
3.2 Control Signal ..............................................................................................................34
3.2.1 Power On/Off ........................................................................................................34
3.2.1.1 Power-On.........................................................................................................34
3.2.1.2 Power-off and Reset......................................................................................36
3.2.1.3 Sleep/Wakeup.................................................................................................37
3.2.1.4 Volume Control ..............................................................................................37
3.3 USB interface ...............................................................................................................37
3.4 UART...............................................................................................................................41
3.5 SPI...................................................................................................................................42
3.6 SD....................................................................................................................................42
3.7 SIM..................................................................................................................................44

Contents
Copyright © Fibocom Wireless Inc. 2
3.8 GPIO...............................................................................................................................45
3.9 I2C...................................................................................................................................47
3.10 ADC ..............................................................................................................................48
3.11 Battery Supply Interface .........................................................................................48
3.11.1 Charging Description........................................................................................49
3.12 Motor Driver Interface ............................................................................................49
3.13 LCD...............................................................................................................................49
3.14 TP..................................................................................................................................52
3.15 Camera........................................................................................................................53
3.15.1 Camera 0..............................................................................................................55
3.15.2 Camera 1..............................................................................................................56
3.15.3 Camera 2..............................................................................................................57
3.15.4 Design Considerations .....................................................................................58
3.16 Audio............................................................................................................................59
3.16.1 Definition of Audio Interface...........................................................................59
3.16.2 MIC Circuit Design .............................................................................................61
3.16.3 Receiver Circuit Design.....................................................................................62
3.16.4 Headphone Interface Circuit Design ............................................................62
3.17 Force Download Interface......................................................................................62
4 Antenna Interface ........................................................................................64
4.1 MAIN/DRX Antenna ....................................................................................................64
4.1.1 Operating Bands ..................................................................................................64
4.1.2 Circuit Reference Design ....................................................................................67
4.2 WIFI/BT Antenna .........................................................................................................67
4.2.1 Operating Bands ..................................................................................................68
4.2.2 Circuit Reference Design ....................................................................................68
4.3 GNSS Antenna .............................................................................................................68
4.3.1 GNSS operating frequency ................................................................................69
4.3.2 Circuit Reference Design ....................................................................................69
4.4 Antenna Requirements .............................................................................................70
5 RF PCB Layout Design Guide ......................................................................72

Contents
Copyright © Fibocom Wireless Inc. 3
6 WIFI and Bluetooth......................................................................................75
6.1 WIFI Overview..............................................................................................................75
6.2 WIFI Performance.......................................................................................................75
6.3 Bluetooth Overview....................................................................................................77
6.4 Bluetooth Performance.............................................................................................78
7 GNSS ..............................................................................................................79
7.1 Overview........................................................................................................................79
7.2 GNSS Performance.....................................................................................................79
8 Electricity, Reliability and RF Performance ...............................................80
8.1 Recommended Parameters .....................................................................................80
8.2 Operating Current ......................................................................................................80
8.3 RF Transmit Power......................................................................................................88
8.4 RF Receiver Sensitivity ...............................................................................................89
8.5 Electrostatic Protection .............................................................................................92
9 Structure Specifications...............................................................................93
9.1 Product Appearance ..................................................................................................93
9.2 Structural Dimensions ...............................................................................................93
9.3 Recommended PCB Soldering Pad Design..........................................................94
9.4 Recommended Thermal Design .............................................................................94
10 Production and Storage ............................................................................95
10.1 SMT ..............................................................................................................................95
10.2 Packaging and Storage...........................................................................................95
Appendix A Acronyms and Abbreviations................................................. 102
Appendix B GPRS Encoding Scheme ......................................................... 105
Appendix C GPRS Multi-timeslot ................................................................ 106
Appendix D EDGE Modulation and Encoding Method............................ 107

Applicable Models
Copyright © Fibocom Wireless Inc. 4
Applicable Models
No.
Applicability Model
Description
1
SC126-NA-10
16GB e.MMC+16Gb LPDDR4X.SDRAM, 4G frequency
band, Android 12, applicable in North America
2
SC126-EAU-10
16GB e.MMC+16Gb LPDDR4X.SDRAM, 4G frequency
band, Android 12, applicable in Europe
3
SC126-CN-10
16GB e.MMC+16Gb LPDDR4X.SDRAM, 4G frequency
band, Android 12, applicable in China

Change History
Copyright © Fibocom Wireless Inc. 5
Change History
V1.2（2022-07-30）
Added CN RF parameters
V1.1 (2022-06-13)
Revised some description errors and added EAU RF parameters.
V1.0 (2022-04-06)
Initial version

1 Foreword
Copyright © Fibocom Wireless Inc. 6
1 Foreword
1.1 Description
This document describes the electrical characteristics, RF performance, structure size,
application environment, etc. of SC126 series module (hereinafter referred to as module).
With the assistance of the document and other instructions, the developers can quickly
understand the hardware functions of the module and develop products.
1.2 Reference Standards
This product is designed with reference to the following standards:
⚫ 3GPP TS 51.010-1 V10.5.0: Mobile Station (MS) conformance specification; Part 1:
Conformance specification
⚫ 3GPP TS 34.121-1 V10.8.0: User Equipment (UE) conformance specification; Radio
transmission and reception (FDD); Part 1: Conformance specification
⚫ 3GPP TS 34.122 V10.1.0: Technical Specification Group Radio Access Network; Radio
transmission and reception (TDD)
⚫ 3GPP TS 36.521-1 V10.6.0: User Equipment (UE) conformance specification; Radio
transmission and reception; Part 1: Conformance testing
⚫ 3GPP TS 21.111 V10.0.0: USIM and IC card requirements
⚫ 3GPP TS 51.011 V4.15.0: Specification of the Subscriber Identity Module -Mobile
Equipment (SIM-ME) interface
⚫ 3GPP TS 31.102 V10.11.0: Characteristics of the Universal Subscriber Identity Module
(USIM) application
⚫ 3GPP TS 31.11 V10.16.0: Universal Subscriber Identity Module (USIM) Application
Toolkit(USAT)

1 Foreword
Copyright © Fibocom Wireless Inc. 7
⚫ 3GPP TS 36.124V10.3.0: Electro Magnetic Compatibility (EMC) requirements for mobile
terminals and ancillary equipment
⚫ 3GPP TS 27.007 V10.0.8: AT command set for User Equipment (UE)
⚫ 3GPPTS27.005 V10.0.1: Use of Data Terminal Equipment - Data Circuit terminating
Equipment (DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast
Service (CBS)
⚫ IEEE 802.11n WLAN MAC and PHY, October 2009 + IEEE 802.11-2007 WLAN MAC and
PHY, June 2007
⚫ IEEE Std 802.11b, IEEE Std 802.11a, IEEE Std 802.11g, IEEE Std 802.11n, IEEE Std
802.11ac, IEEE Std 802.11ax;
⚫ IEEE 802.11-2007 WLAN MAC and PHY, June 2007
⚫ Bluetooth Radio Frequency TSS and TP Specification 1.2/2.0/2.0 + EDR/2.1/2.1+
EDR/3.0/3.0 +HS, August 6, 2009
⚫ Bluetooth Low Energy RF PHY Test Specification, RF-PHY.TS/4.0.0, December 15, 2009
⚫ Bluetooth Low Energy RF PHY Test Specification, RF-PHY.TS/4.2.0, November 7, 2014
⚫ Bluetooth Low Energy RF PHY Test Specification, RF-PHY.TS/5.0.2, December 07,2017
⚫ Bluetooth Low Energy RF PHY Test Specification, RF-PHY.TS/5.1.0, December 07,2018

2 Product Overview
Copyright © Fibocom Wireless Inc. 8
2 Product Overview
2.1 General Description
The module integrates core components such as Baseband, eMCP, PMU, Transceiver, PA;
it supports long distance multi-mode communication such as FDD/TDD-LTE, WCDMA,
GSM and WIFI/BT short-distance radio transmission technology, as well as GNSS wireless
positioning technology. The module is embedded with Android operating system and
supports various interfaces such as MIPI/USB/UART/SPI/I2C. It is the optimal solution for
the core system of wireless smart products. Its corresponding network modes and
frequency bands are as follows:
Table 1. SC126-NA supported bands
Mode
Band
FDD-LTE
Band 2/4/5/7/12/13/17/25/26/66/71
TDD-LTE
Band 41 (2496-2690MHz)
WIFI802.11a/b/g/n/ac
2402-2482MHz; 5170-5835MHz
BT5.0
2402-2480MHz
GNSS
GPS/GLONASS/BeiDou
Table 2. SC126-EAU supported bands
Mode
Band
GSM
GSM850/EGSM900/DCS1800/PCS1900
WCDMA
Band 1/2/3/5/8
FDD-LTE
Band 1/2/3/4/5/7/8/20/28
TDD-LTE
Band 38/40/41 (2496-2690MHz)
WIFI802.11a/b/g/n/ac
2402-2482MHz; 5170-5835MHz

2 Product Overview
Copyright © Fibocom Wireless Inc. 9
Mode
Band
BT5.0
2402-2480MHz
GNSS
GPS/GLONASS/BeiDou
Table 3. SC126-CN supported bands
Mode
Band
GSM
EGSM900/DCS1800
WCDMA
Band 1/8
FDD-LTE
Band 1/3/5/8
TDD-LTE
Band 34/39/38/40/41(2496-2690MHz)
WIFI802.11a/b/g/n/ac
2402-2482MHz;5170-5835MHz
BT5.0
2402-2480MHz
GNSS
GPS/GLONASS/BeiDou
2.2 Main Performance
The module is available in LCC + LGA package with 262 pins, including 146 LCC pins and
116 LGA pins. The dimension is 40.5 (±0.15)mm × 40.5 (±0.15)mm × 2.55 (±0.2)mm. It can
be embedded in various M2M applications. It is suitable for the development of smart
devices such as smart POS, cash registers, robots, UAVs, smart homes, security
monitoring, multimedia terminals, ECR, and face payment terminals. The following table
describes the detailed performance.
Table 4. Performance specifications
Performance
Description
Power Supply
DC: 3.5-4.4V, typical voltage: 3.8V
Application
ARM® Cortex-A53 Quad-core 64-bit CPU up to 2.0GHz

2 Product Overview
Copyright © Fibocom Wireless Inc. 10
Performance
Description
processor
Memory
16Gb LPDDR4X+16GB eMMC Flash1)
Power class
Class 4 (33dBm ±2dB) for GSM850/EGSM900
Class 1 (30dBm ±2dB) for DCS1800/PCS1900
Class E2 (27dBm±3dB) for GSM850/EGSM900 8-PSK
Class E2 (26dBm±3dB) for DCS1800/PCS1900 8-PSK
Class 3 (24dBm+1/-3dB) for WCDMA bands
Class 3 (23dBm ±2dB) for LTE FDD bands
Class 3 (23dBm ±2dB) for LTE TDD bands
GSM/GPRS/EDGE
features
R99:
CSD transmission rate: 9.6kbps, 14.4kbps
GPRS:
Support GPRS multi-slot class 33
Coding formats: CS-1/CS-2/CS-3 and CS-4
Up to 5 Rx time slots per frame
EDGE:
Support EDGE multi-slot class 33
Support GMSK and 8-PSK
Uplink encoding format: CS 1-4 and MCS 1-9
Downlink encoding format: CS 1-4 and MCS 1-9
WCDMA features
Support 3GPP R8 DC-HSPA+
Support 16-QAM, 64-QAM and QPSK modulation
CAT7 HSUPA: maximum uplink rate 5.76Mbps
CAT14 HSDPA: maximum downlink rate 42Mbps

2 Product Overview
Copyright © Fibocom Wireless Inc. 11
Performance
Description
LTE features
Support FDD/TDD R10
Support FDD/TDD CAT4
Support 1.4-20M RF bandwidth
Downlink support 2 × 2 MIMO
Maximum uplink rate 50Mbps, maximum downlink rate 150Mbps
WLAN features
Support 2.4G and 5G WLAN wireless communication, support
802.11a, 802.11b, 802.11g, 802.11n and 802.11ac, the maximum
rate is up to 433Mbps
Bluetooth features
BT5.0 (BR/EDR + BLE)
Satellite positioning
GPS/GLONASS/BeiDou
LCD Interface
4-Lane MIPI_DSI interface
Support for 1080P maximally
Camera interface
Two 4-Lane MIPI_CSI interfaces, which can be configured as 4+4
Lanes or 4+2+1 Lanes
ISPx2 (13MP+13MP or 25MP)
Audio interface
Input: 3 analog MIC inputs
Output: Stereo headphone output
Differential receiver output
Differential Lineout output, which requires an external audio PA
USB interface
One USB 3.1 interface that is downward compatible with USB 2.0
interface USB 3.1 interface supports the SS (5 Gbps) mode but
does not support software download. USB 2.0 interface supports
the HS (480 Mbps) mode and software download, and is downward
compatible with FS and LS interface. USB supports the OTG
function and HUB extensible interface supports USB OTG.

2 Product Overview
Copyright © Fibocom Wireless Inc. 12
Performance
Description
(U)SIM interface
Two (U)SIM card interfaces, support (U)SIM card: 1.8/3V adaptive
Support dual-SIM dual-standby and hot plugging
UART interface
Three UART serial interfaces, with the maximum rate up to 4Mbps
One 4-line serial interface, supports hardware flow control
One 2-line serial interface
One 2-lane debug serial interface
SDIO Interface
Support SD3.0 and 4-bit SDIO; SD card supports hot plugging
I2C interface
4 sets of I2C interfaces for TP, camera, sensor, etc.
ADC Interfaces
One general ADC
RTC
Support
Antenna Interface
MAIN antenna, DRX antenna, GNSS antenna, WIFI/BT antenna
Physical
characteristics
Dimensions: 40.5 (±0.15)mm × 40.5 (±0.15)mm × 2.55 (±0.2)mm
Packaging: 146 LCC pins +116 LGA pins
Weight: ~9.7 g
Temperature range
Operating temperature: -30°C to 75°C2)
Storage temperature: -40°C to -85°C
Software update
USB/OTA/SD
RoHS
RoHS compliant
1) The storage capacity varies according to the actual model.
2) When the module is operating within this temperature range, the
functions of it are normal and the relevant performance meets the 3GPP
standard.

2 Product Overview
Copyright © Fibocom Wireless Inc. 13
2.3 Function Block Diagram
Function block diagram shows the main hardware features of the module, including:
⚫ Baseband
⚫ Wireless transceiver
⚫ Power Management
⚫ Memory
⚫ Peripheral interface
◦ Communication expansion interface (USB/UART/I2C/SD)
◦ (U)SIM card interface
◦ MIPIDSI interface
◦ MIPICSI interface
◦ Analog audio interface

2 Product Overview
Copyright © Fibocom Wireless Inc. 14
Control
Air Interface Memory
Multimedia Connectivity
PA
Duplex
Switch
LNA SAW
SAW Switch
SAW
Diplexer
VPH_PWR
VBAT
VRTC
AUDIO
ADC
RESET
PWRKEY
LCD TP CAM I2CSPI UART (U)SIM SD GPIO USB VoL key
XO
PRxTRx DRx
2.4G 5G
ANT_MAIN ANT_GNSS ANT_DIV ANT_WIFI /BT
LDO OUT
SAW
Figure 1. Function block diagram

2 Product Overview
Copyright © Fibocom Wireless Inc. 15
2.4 Pin Definition
2.4.1 Pin Distribution
Figure 2. Pin distribution

2 Product Overview
Copyright © Fibocom Wireless Inc. 16
"NC" indicates No Connect, and the pin for this position is reserved and does
not need to be connected.
2.4.2 Pin Description
Table 5. I/O parameters description
Type
Description
I/O
Input/Output
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
OD
Open drain
Module pins are described in the following table:
Table 6. Description of module pins
Pin Name
Pin No.
I/O
Pin Description
Remarks
Power interface
VBAT
1, 2,
145,
146
PI
Main power supply
--
VRTC
126
PI/PO
RTC power supply
--
VDD_2V8
129
PO
2.8V voltage output
--

2 Product Overview
Copyright © Fibocom Wireless Inc. 17
Pin Name
Pin No.
I/O
Pin Description
Remarks
LDO15_1V8
111
PO
LDO L15 1.8V power output
--
VPH_PWR
259
PO
General-purpose peripheral
power output
--
LDO19_UIM2
21
PO
UIM2 card power supply
--
LDO18_UIM1
26
PO
UIM1 card power supply
--
IOVDD_1V8
125
PO
LDO 1.8V power output
--
LDO17A_3V0
228
PO
LDO L17 3.0V power output
--
LDO4_SDIO
32
PO
LDO L4 SD pull-up power
output
--
LDO21_SD
38
PO
LDO L21 2.9V SD card power
output
--
Motor interface
VIB_DRV_P
28
PO
Motor driver pin
- -
Ground
GND
3, 7, 12, 15, 27, 51, 62, 69, 76, 78, 85, 86, 88, 89, 120, 122, 130,
132, 135, 140, 143, 144, 147, 148, 149, 150, 160, 161, 162, 163,
164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176,
177, 178, 180, 181, 182, 184, 185, 186, 188, 189, 192, 193, 198,
200, 201, 208, 209, 211, 212, 213, 214, 215, 216, 217, 218, 235,
245, 246, 250, 251, 262
74
Battery Supply Interface
VBAT_SNS
133
AI
Battery positive detection
Connected to the
positive pole of
the battery.
VBAT_M
258
AI
Battery negative detection
Connected to the