LTE Series (A) DB with LTE-FDD/TDD and GNSS Support

Product Overview #

The LTE Series (A) EVB is a wireless communication development board that can be used for educational purposes or as a part of a final product. This board supports LTE-TDD and LTE-FDD, also it can support GNSS and Bluetooth due to the selected variant that was indicated on Table.

This document introduces the LTE (A) Series evaluation boards which is a high performance board to start working with many LTE modules that this product supports. This document can help to quicky understand features, interfaces, electrical characteristics and mechanical details of the supported products. This document is applicable to the variants and products listed on table 1.

Supported Module List #

Model	Description	EICUT Part NO.
EC200U-EU LTE Ser(A) Evaluation Board	• Based on Quectel EC200UEUAB module • LTE CAT1 2G, GNSS, Bluetooth	E0270
EC200A-EU LTE Ser(A) Evaluation Board	• Based on Quectel EC200AEUHA module • LTE CAT4 3G 2G, Diverse Antenna	E0260
EC25-EUX LTE Ser(A) Evaluation Board	• Based on Quectel EC25-EUX module • LTE CAT4 3G 2G, Diverse Antenna	E0200
SLM320E LTE Ser(A) Evaluation Board	• Based on MeiG Smart SLM320E module • LTE CAT1 2G, GNSS, Bluetooth	E0675
SLM770A LTE Ser(A) Evaluation Board	• Based on MeiG Smart SLM770A module • LTE CAT1 / 2G / GNSS / Bluetooth	E0261

Feature List #

Power Supply
- Supply voltage via USB-C or pin-header
- Voltage range: 4.5–5.5 V
- Typical: 5 V
Cellular Features
- LTE-FDD & LTE-TDD support
- GSM/GPRS support, Max. 85.6 kbps (DL) / 85.6 kbps (UL)
- 3G support (available on some variants)
- SMS & Call support
GNSS
- Supports GPS / GLONASS / Galileo / BDS / QZSS constellations
- Available only on EC200U, EC25, and SLM320E models
Bluetooth
- Available only on EC200U, EC25, and SLM320E models
Other Interfaces
- USB 2.0 port (slave mode only)
- 14-pin header
- Nano SIM (USIM)
- SD Card slot
- U.FL antenna connectors
- LED indicators
- Power Key switch
- Reset switch
- BOOT switch
Physical Characteristics
- Size: — (not specified)
- Weight: — (not specified)
Temperature Ranges
- Operating: −35 °C to +75 °C
- Extended: −40 °C to +85 °C
- Storage: −40 °C to +90 °C
RoHS
- All hardware components are fully compliant with EU RoHS directive

Board Resources #

Function Description #

Following Figure indicates the interface definitions of the LTE Series(A) DB series.

Item NO.	Interface	Reference No.	Description
1	Sim Card	SIM1	Nano SIM connector; compatible with all USIMs.
2	SD Card	SD CARD	TF (Micro SD) card for data R/W via AT commands or Open CPU.
3	Push Button	SW1	USB BOOT selection for flashing and debugging.
4	Push Button	SW2	RESET option; connected to the module’s RESET pin.
5	Push Button	SW3	POWER KEY to power up the LTE module; works only when the “J1” jumper cap is not present.
6	Jumper Cap	J1	POWER KEY. When present, the module powers on when board power is applied.
7	14 Pin-Header	J2	14-pin expansion I/O connector.
8	BT/Div Antenna	Wi-Fi/BT or Div	For EC25, EC200U, SLM320: connected to on-board Wi-Fi/BT SMD chip antenna. For EC200A, SLM770A: connected to IPEX UFL as diversity antenna.
9	GNSS Antenna	GNSS ANT	Active antenna IPEX-UFL; only for EC25, EC200U, SLM320.
10	Main Antenna	MAIN ANT	IPEX UFL for main cellular antenna connection.
11	LED	D3	Connected to STATUS pin on LTE module (active-low).
12	LED	D2	Connected to NET STATUS pin on LTE module (active-high).
13	LED	D1	Connected to NET MODE pin on LTE module (active-high).
14	LTE Module	U21	Main LTE module.
15	USB TYPE-C	USB	Used for both power supply and USB device data with the LTE module.
16	Jumper Cap	J3	Connected to the module’s VBUS pin; enables/disables the module’s USB device.

LTE Series (A) DB Accessories #

The following figure indicates the accessories on the LTE Series(A) EVB package.

Development Board Dimension #

The following Figure indicates the dimensions of the LTE Series(A) EVB.

LTE Series(A) EVB Dimension — **LTE Series(A) DB Dimension : 58.04 × 78.23 mm**

Dimension and Package #

Item	Description
Dimensions	58.04 × 78.23 mm
G.W Weight	0.12 KG

FAQ #

What modules are supported by the LTE Series (A) Evaluation Board?

Quectel EC200U-EU, EC200A-EU, EC25-EUX, MeiG SLM320E and SLM770A modules are fully supported on the same EVB platform with minor differences in antennas and features.

How to power the LTE Series (A) EVB?

You can power the board via USB-C (recommended) or through the 5V pin on the 14-pin header. Accepted voltage range is 4.5–5.5 V (typical 5 V).

Which modules support GNSS and Bluetooth?

GNSS and Bluetooth are available on EC200U-EU, EC25-EUX, and SLM320E variants. EC200A-EU and SLM770A do not include GNSS/BT.

How to turn on the LTE module?

Two ways:
• Place the J1 jumper cap → module powers on automatically when 5 V is applied.
• Remove J1 jumper and press the POWER KEY (SW3) button for ~1 second.

What are the LED indicators for?

• D1 (NET MODE): Indicates current network technology (LTE/3G/2G)
• D2 (NET STATUS): Shows registration status (blinking = searching, solid = registered)
• D3 (STATUS): Module powered on (active-low)

Can I use an external cellular antenna?

Yes. The board has MAIN ANT (required) and DIV ANT (diversity, only on EC200A & SLM770A) U.FL connectors. You can also use the onboard SMD antenna on EC200U/EC25/SLM320E models for BT/Wi-Fi.

Is USB used only for power or also for data?

Both. The USB-C port provides power and exposes the module’s USB 2.0 device interface (AT commands, firmware upgrade, virtual COM ports). Keep J3 jumper installed for normal USB operation.

How to enter USB Boot / DFU mode for flashing?

Hold the SW1 (BOOT) button while powering the board (or press RESET while holding BOOT). The module will enter USB Download / DFU mode for QFlash or Quectel/MeiG upgrade tools.

What is the operating temperature range?

Normal operating: −35 °C to +75 °C
Extended range: −40 °C to +85 °C
Storage: −40 °C to +90 °C

What are the board dimensions?

Board size: 58.04 × 78.23 mm — compact and easy to integrate into final products.