Heltec Sufficient IoT Hub A Linux Based IoT Terminal Device User Manual

: June 15, 2024
: HELTEC

Table of Contents

Document version
Copyright Notice
Disclaimer
Sufficient IoT Hub Overview
Specifications **
Extended Interface
System
Typical hardware features
Resource
FCC Statement
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Sufficient IoT Hub
A Linux Based IoT Terminal Device User Manual

Document version

Version	Time	Description	Remark
Rev. 1.0	12/14/2022	Documents creating	Navi
Rev. 1.1	3/1/2023	Information update	Aaron Lee

Copyright Notice

All contents in the files are protected by copyright law, and all copyrights are reserved by Chengdu Heltec Automation Technology Co., Ltd. (hereinafter referred to as Heltec).
Without written permission, all commercial use of the files from Heltec are forbidden, such as copy, distribute, reproduce the files, etc., but non- commercial purpose, downloaded or printed by individual are welcome.

Disclaimer

Chengdu Heltec Automation Technology Co., Ltd. reserves the right to change, modify or improve the document and product described herein. Its contents are subject to change without notice. These instructions are intended for you use.

Sufficient IoT Hub Overview

The Sufficient IoT Hub is a Linux system-in-package with a dual-core 64-bit ARM A7 processor running at 1GHz and 128MB of DDR3. This is an IoT-only device that includes LoRa, Wi-Fi, and Bluetooth. We created a dedicated Sufficient IoT OS for it, which also includes a CLI application and web UI to operate onboard resources directly. So that even if the user has no programming experience, they can efficiently operate PWM, I2C, SPI, LoRa, and other protocols to develop whatever they desire.
It can, for instance, be used to read sensor data from I2C and transmit it via LoRaWAN, as an MQTT broker, as a LoRa Server in a local area network, or even as a LoRa gateway via an expansion panel.

Sufficient IoT Hub are available in the following product variants:
Table 1.1 Product model list

No.	Model	Description
1	Sufficient IoT Hub (LF)	433~510MHz working LoRa Node frequency, used

for China mainland (CN470) LPW band.
2| Sufficient IoT Hub (HF)| For EU868, IN865, US915, AU915, AS923, KR920 and other LPW networks with operating frequencies between 863~928MHz.

1.1 Product Features
➢ Allwinner T1113-S3 processor, Dual-Core ARM Cortex™ -A7 800MHz CPU.

128MB SiP DDR3 RAM, Micro TF card slot.
Work with Sufficient IoT OS, a dedicated OS for this device, it’s based on Linux
(5.4.61 Kernel, 32-bits) Debian 10 Operating system.
Built in Sufficient IoT application, allow user to operate onboard resources efficiently.

➢ On-board Peripherals

XR829 (Wi-Fi and Bluetooth capabilities available)
SX1262 (provides LoRa node functionality)

➢ On-Board Interface

One 10/100M Ethernet interface (RJ45 connector)
One TF card slot
A three-wire debug serial port
One 5V power input connector
One USB HOST Type C interface
A TWI interface
Two universal UART interfaces
One SPI interface
One ADC interface
Two PWM interfaces

➢ Interact

A reset button
Two functional button
A power light.
A user-defined light

➢ Input power：+5V or +3.3V
➢ Operating temperature：-40°C～85 °C
➢ Encryption chip.

Specifications **

**

2.1 General specifications
Table 2-1: General specifications

Parameters	Description
MCU	Dual-Core ARM CortexTM-A7 CPU, 800MHz.
LoRa Chip	SX1262
LoRa Frequency	863～870MHz, 902～928MHz, 470～510MHz
LoRa Max. TX Power	21 ± 1 dBm
Wi-Fi	802.11 b/g/n
Ethernet	100M RJ45 socket
Supply voltage	+5V, +3.3V
Power consumption	Max. ≈ 150mA, standby ≈ 100mA
Operating temperature	-40 ~ 85 ℃
Dimensions	90 x 41 x 11 mm
Clock Inputs	• OSC — 32.768KHz external crystal.

• DCXO — 24MHz external crystal.

2.2 Operating conditions
2.2.1 Power supply range
Except when USB or 5V Pin is connected separately, only a single power supply can be connected.
Table 2-2: Power supply range

Power supply mode	Minimum	Typical	Maximum	Company
5V Power Adapter(≥500mA)	4.7	5	5.5	V
Type-C USB(≥500mA)	4.7	5	5.5	V
5V Pin (≥500mA)	4.7	5	5.5	V

2.2.2 Power output
Table 2-3: Power output

Output Pin	Minimum	Typical	Maximum	Company
5V Pin			2000	mA
3.3V Pin			2000	mA

2.2.3 Power characteristics
Table 2-4: Power characteristics

Mode	Condition	Typical	Company
IDLE	USB powered	98	mA
Wi-Fi	USB powered	110	mA
Ethernet	USB powered	100	mA
SX1262_TX	22dBm, USB powered	150	mA
SX1262_RX	USB powered	108	mA

2.3 LoRa RF characteristics
2.3.1 Transmit power
Table 2-5 Transmit power

Operating frequency band	Maximum power value/[dBm]
470~510 MHz	21 ± 1
867~870 MHz	21 ± 1
902~928 MHz	21 ± 1

2.3.2 Receiving sensitivity
The following table gives typically sensitivity level of the Sufficient IoT Hub (L/H).
Table 2-6: Receiving sensitivity.

Signal Bandwidth/[KHz]	Spreading Factor	Sensitivity/[dBm]
125	SF12	-139
125	SF10	-130
125	SF7	-124

2.5 Onboard Resource

2.6 Pin definition
2.6.1 Pin assignment
2.6.2 Pin description

The function described in red font is only for illustration, indicating that the pin has been used for special functions and cannot be used as GPIO.

General purpose GPIO row of 32 pin ports. They allow you to integrate Sufficient loT Hub into your projects, and these expansion ports can be configured for many different purposes.
Table 2-7: Sufficient IoT Hub pin description

No.	Name	Type	Function 1	GPIO NUM (PA0=0) 2
1	GND	P	Ground.	–
2	5V	P	Input/Output 5V.	–
3	GND	P	Ground	–
4	3.3V	P	Output 3.3V, power supply or external device.	–
5	PE13	I/O	PE13	141
6	PE12	I/O	PE12	140
7	PD0	I/O	PD0, User key.	96
8	PD22	I/O	PD22, User key.	118
9	TWI2_SDA	I/O	PD21 , TWI2_SDA	–
10	TWI2_SCK	I/O	PD20 , TWI2_SCK	–
11	UART2_TX	I/O	PD1 , UART2_TX	–
12	UART2_RX	I/O	PD2 , UART2_RX	–
13	PD3	I/O	PD3	99
14	PD4	I/O	PD4	100
15	PD5	I/O	PD5	101
16	PD6	I/O	PD6	102
17	UART4_TX	I/O	PD7 , UART4_TX	–
18	UART4_RX	I/O	PD8 , UART4_RX	–
19	PD9	I/O	PD9	105
20	RESET	I, OD	Reset Signal (low active)	–
21	SPI1_CS	I/O	PD10 , SPI1_CS	–
22	SPI1_CLK	I/O	PD11 , SPI1_CLK	–
23	SPI1_MISO	I/O	PD13 , SPI1_MISO	–
24	SPI1_MOSI	I/O	PD12 , SPI1_MOSI	–
25	PD14	I/O	PD14	110
26	PD15	I/O	PD15	111
27	PD18	I/O	PD18, PWM2	–

¹The function described in red font is only for illustration, indicating that the pin has been used for special functions and cannot be used as GPIO.
²GPIO number in system, the calculation formula is: M * 32 + n (M is pin group, A=0, B=1, etc.). For example —

PB2: 1 * 32 + 2 = 34.

28	PD19	I/O	PD19, PWM3	–
29	UART3_RX	I/O	PB7, UART3_RX, debug RX	–
30	UART3_TX	I/O	PB6, UART3_TX, debug TX	–
31	PB5	I/O	PB5	37
32	PB4	I/O	PB4	36
33	PB3	I/O	PB3	35
34	PB2	I/O	PB2	34
35	TP-X1	AI	TP-X1	–
36	TP-X2	AI	TP-X2	–
37	TP-Y1	AI	TP-Y1	–
38	TP-Y2	AI	TP-Y2	–
39	GND	P	Ground	–
40	ADC	AI	ADC	–
41	USB1_P	A I/O	USB1_P	–
42	USB1_N	A I/O	USB1_N	–
43	GND	P	Ground	–
44	GND	P	Ground	–

Extended Interface

3.1 Power connector
The Sufficient IoT Hub requires an operating voltage of 5V and an operating current of 500mA DC. Most 5V-DC adapters with 2.1mm inner aperture plugs can be used to drive the Sufficient IoT Hub today.

3.2 Ethernet Interface
This is a standard RJ45 Ethernet connector which facilitates your project to access the Internet. You can connect it directly to your router or you can connect it to your computer to share the Wi-Fi network.

3.3 Reset button
The reset button is used to reboot the board, and the most logical way to trigger a reboot operation is in the operating system; using a hardware reboot may corrupt the files being processed. Of course, if your system is no longer able to respond to software commands, the reset button is the only way to trigger a reboot.

3.4 Debugging Interface
The development board uses serial port 3 (PB6, PB7) as the debug output serial port, the baud rate of the serial port is 115200, connect the serial port 3 to the computer above the serial software, you can see the printout.

3.5 USB Host Port
The Sufficient IoT Hub is equipped with a USB Host port.

3.6 MicroSD card slot
Instead of a hard drive like a computer, the Sufficient IoT Hub uses a Micro SD as a hard drive to store the operating system, programs and personal data.

System

Sufficient IoT OS is an operating system specially optimized for this product. Based on Linux 5.4.61 Kernel, Debian10, we have made a lot of tailoring and optimization on the operating system for the hardware platform, making it very suitable for working with this set of hardware.
In addition, we also prepared a set of Sufficient IoT Application, make it easier for users to operate its hardware resources. The Sufficient IoT Application include a CLI model and a web UI model.

Typical hardware features

5.1 Physical dimensions

Resource

6.1 Relevant resource

User manual
Datasheet

Heltec Contact Information
Heltec Automation Technology Co., Ltd
Chengdu, Sichuan, China
Email: support@heltec.cn
Phone: +86-028-62374838
https://heltec.org

FCC Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.

To assure continued compliance, any changes or modifications not expressly approved by the party.
Responsible for compliance could void the user’s authority to operate this equipment. (Example- use only shielded interface cables when connecting to computer or peripheral devices).
This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

This device may not cause harmful interference, and
This device must accept any interference received, including interference that may cause undesired operation.

FCC Radiation Exposure Statement:
The equipment complies with FCC Radiation exposure limits set forth for uncontrolled enviroment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body.

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