Hardware Reference Guide

Note

Please refer to Hardware reference manual provided by respective module vendors for Module documentation.

Logicrom Spark LTE-G

Logicrom Spark LTE-G stands as an Arduino-compatible development board, meticulously crafted by Waybyte Solutions. Engineered to mirror the form factor of Arduino UNO R3/R4 boards, it offers the added convenience of selectable IO voltage levels (defaulting to 5V, with the option to switch to 3.3V). This shared design simplifies the process of directly interfacing existing Arduino shields with the Logicrom Spark board, expediting prototyping and development.

The Logicrom Spark LTE-G board hosts an impressive suite of features, including:

• Up to 30 GPIOs

• 3 ADC interfaces

• 2 PWM-capable IOs

• 2 UARTs

• 1 SPI LCD interface

• 1 SPI interface

• 2 I2C ports, one of which is Qwiic compatible

• USB 2.0 slave functionality, supporting 2 virtual serial ports for application use

• 1 SD interface

• 1 USIM slot

• On-chip GNSS

• Bluetooth 4.2

Boasting a developer-friendly design, the Logicrom Spark facilitates programming with ease, whether through the Arduino framework or the Logicrom OpenCPU SDK. Whether you’re an experienced product engineer or an enthusiastic hobbyist, the Logicrom Spark emerges as the perfect choice for your prototyping and development endeavors.

Board Description

Logicrom Spark LTE-G (LTE Cat.1 with GNSS) compatible with Arduino

#	Key Component	Description
1	EC200U-CN-AA	A module with UIS8910DM at its core, manufactured by Quectel. For more information, see EC200U Hardware Reference Manual.
2	Power Jack	DC power supply, range 5V - 16V.
3	Type-C USB port	USB interface for communication and firmware flashing, Power supply for the board.
4	Reset	Module reset button.
5	USB Boot	Force USB boot button, for emergency flashing.
6	I/O Connector 1	Most of the pins on the EC200U module are broken out to the pin headers on the board. You can program EC200U to enable multiple functions such as PWM, ADC, I2C, SPI, etc.
7	I/O Connector 2	Analog and PWM pins are available on this connector.
8	Power Connector	Power input and output connector with reset control.
9	IO Level select	To select IO level between 5V (default) and 3.3V.
10	Qwiic I2C Connector	I2C port compatible with Qwiic ecosystem.
11	LEDs	LED indicator for Network, RX/TX activity and Arduino LED_BUILTIN
12	LCD Interface	SPI LCD interface for resolution upto 320x240px.

Power Supply Options

There are three mutually exclusive ways to provide power to the board:

• USB port, default power supply

• Power Jack or VIN on power pin header

• 5V from power pin header

Header Block

There are 5 broadly categorized header blocks on Logicrom Spark board. Following are the details of each header block group.

Digital IO Header

Name	Type [1]	Function [2]
TX	O	UART0_TX
RX	I	UART0_RX
D2	I/O	GPIO24, SD_CMD
D3	I/O	GPIO10, SD_CLK [3]
D4	I/O	GPIO25, SD_D0
D5	I/O	GPIO26, SD_D1
D6	I/O	GPIO27, SD_D2
D7	I/O	GPIO28, SD_D3
D8	I/O	GPIO18_ALT
D9	I/O	GPIO19_ALT
D10	I/O	GPIO23, SPI1_SS [4]
D11	I/O	GPIO2, SPI1_MOSI
D12	I/O	GPIO3, SPI1_MISO
D13	I/O	GPIO0, SPI1_CLK
GND	G	Ground
SDVDD	P	SD Card power
SDA	I/O	GPIO17, I2C0_SDA
SCL	I/O	GPIO16, I2C0_SCL

Analog IO Header

Name	Type [1]	Function [2]
A0	AI/O	AIN0, IO11 [5]
A1	AI/O	AIN1, IO12 [5]
A2	AI/O	AIN2, IO20_ALT [5], UART1_RX
D19	I/O	GPIO21_ALT, UART1_TX
D20~	I/O	GPIO5, PWM_CH0
D21~	I/O	GPIO13, PWM_CH1

Power Header

Name	Type [1]	Function
NC	-	Not connected
VDD	P	IO VDD level (output)
RST	I	Reset Input
3V3	P	3.3V power output, 200mA max
5V	P	5V power output, 2A max when on external supply
VIN	P	VCC input 5-16V, 1A min

IOREF Select

No.	Name	Type [1]	Function
1	3V3	P	3.3V
2	VDD	P	IO VDD level
3	5V	P	5V

Note

Pin 2-3 of IOREF is connected via jumper to select 5V as default IO VDD level.

LCD Header

No.	Name	Type [1]	Function [2]
1	RST	O	LCD Reset control
2	GND	G	Ground
3	CS	I/O	LCD Chip select, GPIO3_ALT
4	DIO	I/O	LCD Data IO, GPIO0_ALT
5	CLK	I/O	LCD Clock, GPIO2_ALT
6	DC	I/O	LCD Data/Command select, GPIO1_ALT

[1] (1,2,3,4,5)

P: Power supply; I: Input; O: Output; A: Analog.

[2] (1,2,3)

GPIO pins as per Logicrom OpenCPU SDK

[3]

SD_CLK line is not a mux function of IO, It can be enabled by resistor swapping. See Hardware schematic for more information.

[4]

SPI_SS is not Hardware function of this IO. Use GPIO to control this line to use as SPI CS. If hardware chipselect line is required, use CS_HW test point on board. Refer Hardware schematic for more information.

[5] (1,2,3)

Analog input is not a multiplexed IO pin. To enable IO function resistor swapping to be done. Hardware schematic for more information.

Pin Layout

Start Application Development

Before powering up your board, please make sure that the board is in good condition with no obvious signs of damage. Create your project selecting “Logicrom Spark LTE-G” as your board in platformIO. Follow the steps for preferred framework.

Logicrom OpenCPU SDK

To start your development with Logicrom OpenCPU SDK, follow the quick start guide Creating Project in PlatformIO using Logicrom OpenCPU SDK.

Arduino

To run your first Arduino application on your Logicrom Spark board, follow the quick start guide Creating Project in PlatformIO using Arduino Framework.

Related Documents

• Logicrom Spark LTE-G schematic (PDF)

• EC200U Hardware Reference Manual (PDF)