Lierda LTE Cat.1 bis OpenCPU Product Overview
Note
This document introduces Lierda LTE Cat.1 bis OpenCPU core capabilities, OpenSDK base-package selection, module capability comparison, knowledge-base directory, and resource entries.
1. OpenCPU Capabilities
Cat.1 bis OpenCPU is an open application-development solution for cellular IoT terminals. Developers can run their business applications inside the communication module, reducing external MCU dependency and making terminal designs lighter, more compact, and easier to iterate.
Lierda OpenCPU uses a separated base-package architecture: Lierda maintains the stable base package, while customers develop, compile, and upgrade their upper-layer App code independently. Developers can focus on business logic, peripheral adaptation, and product functions without repeatedly handling the full system project.
Core capabilities include:
Separated Base Package: Stable maintenance of the lower-level system, cellular stack, and standard interfaces reduces base adaptation risks.
Independent App Partition: User Apps can be managed and upgraded independently, making post-mass-production iteration and maintenance easier.
Fast Compilation: The workflow mainly compiles the upper-layer App project, reducing wait time during frequent debugging and verification.
Standard Interfaces: Common system, cellular, and peripheral capabilities are exposed through standardized APIs for easier project reuse.
Complete Toolchain: Covers code compilation, firmware download, log capture, runtime analysis, and issue localization.
Full Firmware Upgrade: Supports project-oriented FOTA file generation to reduce differential-package and multi-version maintenance costs.
Open Resources: SDKs, API documents, sample code, and quick-start materials are available for public access.
Production Friendly: Clear mapping between base packages, modules, and project parameters reduces repeated confirmation during bring-up.
2. OpenCPU Module Selection Table
Module Series |
Chipset |
OpenSDK Base Package |
Compatible Module Models |
Notes |
|---|---|---|---|---|
NT26-K B Series |
EC716E |
K2B_A |
NT26K2B3 |
For K Series Cat.1 bis OpenCPU solution |
NT26-K E Series |
EC716E |
K2E_A |
NT26K2E0 |
GNSS positioning module |
NT26-F C Series |
EC718PM |
/ |
NT26F6C0 |
Wide-voltage module |
NT26-F D Series |
EC718PM |
F6D_A |
NT26F6D0, NT26F6D0-GL, NT26F6D0-EU, NT26F6D0-LA, NT26F6D0-NA, NT26F8D0 |
D Series base package |
Note
Before project import, verify whether the PROJECT, MODEM, and MODEMPKG Makefile variables match. For OTA, SECBOOT, VoLTE, or peripheral-driver requirements, also confirm base-package feature switches and project configuration.
3. Module Basic Capabilities
Product |
NT26-KCN B Series |
NT26-KCN E Series |
NT26-FCN C Series |
NT26-FCN D Series |
|---|---|---|---|---|
Product Image |
|
|
|
|
Form Factor |
LCC+LGA |
LCC+LGA |
LCC |
LGA |
Dimensions (mm) |
17.7×15.8×2.4 |
17.7×15.8×2.4 |
17.7×15.8×2.4 |
17.7×15.8×2.4 |
Pin Count |
109 |
109 |
44 |
109 |
LTE Category |
LTE Cat.1 bis |
LTE Cat.1 bis |
LTE Cat.1 bis |
LTE Cat.1 bis |
Frequency Bands |
FDD: B1/3/5/8 TDD: B34/38/39/40/41 |
FDD: B1/3/5/8 TDD: B34/38/39/40/41 |
FDD: B1/3/5/8 TDD: B34/38/39/40/41 |
FDD: B1/3/5/8 TDD: B34/38/39/40/41 |
FLASH |
2MB/4MB |
4MB |
4MB |
4MB/8MB |
RAM |
1MB |
1MB |
4MB |
4MB |
Weight (approx.) (g) |
1.4 |
1.4 |
1.4 |
1.4 |
Operating Temperature |
-30°C~+75°C |
-30°C~+75°C |
-30°C~+75°C |
-30°C~+75°C |
Extended Temperature |
-40°C~+85°C |
-40°C~+85°C |
-40°C~+85°C |
-40°C~+85°C |
Data Transmission |
||||
LTE Data Rate (Max)(Mbps) |
LTE-FDD: 10 (DL)/5 (UL) LTE-TDD: 8.96(DL)/3.1(UL) |
LTE-FDD: 10 (DL)/5 (UL) LTE-TDD: 8.96(DL)/3.1(UL) |
LTE-FDD: 10 (DL)/5 (UL) LTE-TDD: 8.96(DL)/3.1(UL) |
LTE-FDD: 10 (DL)/5 (UL) LTE-TDD: 8.96(DL)/3.1(UL) |
SMS |
Optional |
Optional |
Optional |
Optional |
Protocols |
Supported TCP/UDP/HTTP/SSL*/MQTT/FOTA/PPP*/RNDIS*/FTP*/ECM*, etc. |
Supporteds TCP/UDP/HTTP/SSL*/MQTT/FOTA/PPP*/RNDIS*/FTP*/ECM*, etc. |
Supporteds TCP/UDP/HTTP(S)/SSL/MQTT(S)/FOTA/FTP/LWM2M, etc. |
Supporteds TCP/UDP/HTTP(S)/SSL/MQTT(S)/FOTA/PPP/RNDIS/FTP/ECM, etc. |
Interfaces |
||||
(U)SIM |
x 2 |
x 2 |
x 1 |
x 2 |
UART |
x 3 |
x 1 |
x 3 |
x 3 |
USB 2.0 |
× 1 |
x 3 |
/ |
x 1 |
I2C |
× 1 |
x 1 |
x 1 |
x 1 |
Audio Analog (PWM) |
Single-ended |
Single-ended |
Differential |
/ |
Audio Digital (PCM/I2S) |
/ |
/ |
Supported |
Supported |
ADC |
× 2 |
× 2 |
x 3 |
x 2 |
Antenna |
× 1 |
× 2 |
x 1 |
x 1 |
VDD_EXT |
Off in sleep mode (can be customized to remain powered)* |
Off in sleep mode (can be customized to remain powered)* |
Off in sleep mode |
Off in sleep mode |
Enhanced Features |
||||
GNSS |
/ |
GPS/BDS (BeiDou-only Supporteded) |
/ |
/ |
Wi-Fi Scan |
Optional |
Optional |
Optional |
Supported |
BlueTooth |
/ |
/ |
/ |
/ |
DFOTA |
Supported |
Supported |
Supported |
Supported |
(U)SIM Card Detection |
Supported |
Supported |
/ |
Supported |
Audio Playback/Recording |
/ |
/ |
Optional |
Optional |
VoLTE (Software Feature) |
/ |
/ |
/ |
Optional |
Firmware Update |
Upgrade via USB/UART or DFOTA |
Upgrade via USB/UART or DFOTA |
Upgrade via UART or DFOTA |
Upgrade via USB/UART or DFOTA |
Electrical Features |
||||
Supply Voltage Range |
3.3V~4.5V, typical value 3.8V |
3.3V~4.5V, typical value 3.8V |
2.3V~4.5V, typical value 3.8V |
3.3V~4.5V, typical value 3.8V |
Transmit Power |
23dBm ± 2.7dB |
23dBm ± 2.7dB |
23dBm ± 2.7dB |
23dBm ± 2.7dB |
Power Consumption (USB Disconnected) |
Shutdown 0.74 μA 6.5 μA @ AT+CFUN=0 0.22 mA @ LTE-FDD PF = 128 0.14 mA @ LTE-FDD PF = 256 3.72 mA @ Idle LTE-FDD PF = 64 |
Shutdown 0.86 μA 3.1 μA @ Sleep AT+CFUN=0 0.17 mA @ LTE-FDD PF = 128 0.15 mA @ LTE-FDD PF = 256 4.1 mA @ Idle LTE-FDD PF = 64 |
3.14 μA @ AT+CFUN=0 0.273 mA @ LTE-FDD PF = 128 0.142 mA @ LTE-FDD PF = 256 3.47 mA @ Idle LTE-FDD PF = 64 |
Shutdown 0.9 μA 2.6 μA @ AT+CFUN=0 0.21 mA @ LTE-FDD PF = 128 0.15 mA @ LTE-FDD PF = 256 3.27 mA @ Idle LTE-FDD PF = 64 |
Software Features |
||||
USB Serial Driver |
Windows10/11 |
Windows10/11 |
Windows10/11 |
Windows10/11 |
RIL Driver |
Android 7/8/10/11/12/13/15 |
Android 7/8/10/11/12/13/15 |
Android 7/8/10/11/12/13/15 |
Android 7/8/10/11/12/13/15 |
RNDIS Driver |
Windows10/11,Linux2.6/3.x/4.x |
Windows10/11,Linux2.6/3.x/4.x |
Windows10/11,Linux2.6/3.x/7.x |
Windows10/11,Linux2.6/3.x/6.x |
ECM Driver |
Linux2.6/3.x/4.x |
Linux2.6/3.x/4.x |
Linux2.6/3.x/7.x |
Linux2.6/3.x/6.x |
TTS |
/ |
/ |
Supported |
Supported |
Certifications |
Mandatory Certifications: NAL/SRRC/CCC Carrier Certifications: Telecom Entry/China Mobile Entry/China Unicom Entry* Environmental Certifications: RoHS |
Mandatory Certifications: NAL/SRRC/CCC Carrier Certifications: Telecom Entry/China Mobile Entry/China Unicom Entry* Environmental Certifications: RoHS |
Mandatory Certifications: NAL/SRRC/CCC Carrier Certifications: Telecom Entry/China Mobile Entry/China Unicom Entry* Environmental Certifications: RoHS |
Mandatory Certifications: NAL/SRRC/CCC Carrier Certifications: Telecom Entry/China Mobile Entry/China Unicom Entry* Environmental Certifications: RoHS |
Application Areas |
IPC, POS, financial payment, smart metering, intelligent sharing, positioning and tracking, etc. |
|||
Others |
||||
Note1 |
* Indicates the feature is under development or available as an option. |
* Indicates the feature is under development or available as an option. |
||
Note2 |
This selection table only displays AT pass-through, for more functions please refer to OpenCPU. |
This selection table only displays AT pass-through, for more features please refer to OpenCPU. |
||
Note 3 |
NT26-KCN Series |
NT26-KCN Series |
NT26-FCN Series |
NT26-FCN Series |
Note
Notes: '/' indicates that the item is unsupported or not applicable. '*' usually indicates a feature under development or available as an option. Final specifications are subject to the latest datasheet, certification materials, and project confirmation.
4. Knowledge Base Directory
01 OpenCPU Basics: Solution positioning, separated base-package architecture, independent App partition, toolchain, and open resources.
02 Module Selection and Base Packages: NT26-K B Series, NT26-K E Series, NT26-F C Series, and NT26-F D Series.
03 SDK Quick Start: SDK layer structure, directory structure, basePkg package, and examples projects.
04 Build and Flash: Model and project confirmation, Windows build, Linux Make build, firmware output, and flashing.
05 Capability Supplements: Full OTA, SECBOOT, logs and issue localization, and demo examples.
06 Resources and Support: GitHub SDK, public documentation, issue submission, and technical support entry.