In-depth analysis of T-BOX system solution: wireless connection unit

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In-depth analysis of T-BOX system solution: wireless connection unit [Copy link]

 

Section 5: Wireless Connection Unit

In T-BOX, The wireless connection unit mainly includes the following four modules: GSM/GPRS/LTE, GPS, Wi-Fi and Bluetooth.

Figure - 1

1) GSM/GPRS/LTE

GSM/GPRS/LTE are all mobile communication technologies. GSM (Global System for Mobile Communications) is the second generation mobile communication system, which is what we often call 2G; GPRS (General Packet Radio Service) is a general packet radio service developed based on GSM, commonly known as 2.5G; LTE (Long Term Evolution) is the fourth generation mobile communication system, which is 3.9G, and LTE-A is 4G.

Their speed levels are as follows: GSM < GPRS < LTE. Usually, these communication systems do not exist separately, for example, Qualcomm processors integrate 4G communication modules. As mentioned in the previous emergency call unit, when encountering an emergency, the call center uses these communication modules to contact the car owner.

2) GPS

GPS (Global Positioning System) mainly provides the location coordinates of the vehicle for tracking or navigation. As mentioned in the previous emergency call unit, when encountering an emergency, the call center can obtain the specific location of the vehicle through the GPS module, so as to carry out rescue work in time. 3) Wi-Fi In the application of T-BOX, Wi-Fi is mainly used as a wireless hotspot to connect electronic devices in the car, such as mobile phones, tablets, computers, etc. TI's solutions include SimpleLink Wi-Fi solutions and WiLink 8 SimpleLink Wi-Fi solutions rely on microcontroller systems. Microcontrollers only want to add Ethernet functions to send simple status information or receive control commands. Users can quickly start designing without being proficient in RF/Wi-Fi theory, thus shortening the development cycle. WiLink 8 solutions are used in typical microprocessor systems that require high throughput, performance, and integration, such as hard disk drives, e-books, etc. Their differences can be summarized as shown in the following Table-1:

[ tr][td=181] [/table ]

Table- 1

inT-BOX can be used in applications WiLink[/ color] series, such as 查看详情

[tr][td =141]

RX sensitivity (dBm)

[tr ][td=141]

Package

	SimpleLink Wi-Fi		cn/zh-cn/wireless-connectivity/simplelink-solutions/wi-fi/overview/wilink-combo-solutions.html]WiLink
Wireless MCU (SoC)	Network Processor
[p= 21, null, center]Main processor	MCU (internal integration)	MCU (external)	MPU (external)
Operating system [/td][td=2, 1,294] RTOS /None	Linux/Android/RTOS [/td][ Data throughput (MBPS) <20	100
Supported bandwidth (GHz)	2.4		2.4/5
Integrated network protocol TCP/IP	√		[/td][/ tr]
End-to-end security of the Internet of Things	√[/ p]
[p =21, null, center]Low power optimization	√		[ p=21, null, center]
Monitoring Certification [/td][td =2,1,294] √
Wi-Fi+BLE coexistence	√ (BLE external) [/td][td=198 ] √(BLE+BT integration)
SimpleLink MCU platform support	√		[/ p]
Cloud IoT Support	[p=21 , null, center]HomeKit, AWS, Azure, IBM and more		HomeKit
[p=21, null , center]Related products	CC3200 [/td ][td=144] CC3100 [/td ][td=198] WL1801,WL1805,WL1807, [ color=rgb(170, 102, 102)]WL1831,WL1835,WL1837
[p=21 , null, center]WL1805 [/td ][td=95] WL1807 [/td][td=3,1, 95] WL1831 [/td ][td=2,1,95] WL1835 [/td ][td=95] WL1837
Processor	External MPU
Technical support	Wi-Fi				Bluetooth low energy/Wi-Fi
Data throughput (MBPS)	100
-96 [/td ][/tr]
TX current (mA)	247 247	, center]238		247	247		238
Operating temperature range (℃)	-20 to 70[ /p]	-20 to 70		-40 to 85		-20 to 70	[p=21, null ,center]-20 to 70		-40 to 85
MOC (100 pin LGA Module)[/p ]
			[/td][td =95]					[/ td][td=95]

Table - 2

The features of this series are listed as follows:[ /font]

• Simple design: Integrates RF and power management, allowing you to start designing at any time without having RF/Wi-Fi expertise;
• Performance Advantages: Optimized real-time online profile function; low power consumption mode can be used when powered by battery; high throughput; wide coverage. About WiLink series detailed introduction and introduction For guidance, calibration and testing, certification information, etc., please click on the following links:
  • [url =http://processors.wiki.ti.com/index.php/WL18xx?DCMP=wilink8&HQS=wilink8wiki]Welcome to the WiLink 8 Wi-Fi + BT/BLE Main Page[/url] [/ list] TI also provides corresponding evaluation boards: align]
    • WiLink 8 Module 2.4 GHz WiFi + Bluetooth COM8 Kit for Sitara
    4） Bluetooth
    [color=rgb(85, 85, There are many reasons to apply Bluetooth technology to the automotive field: good interoperability with smartphones and wearable devices; low power consumption, which can extend the battery life; The module is small and does not take up much space in the car. It provides cost-effective solutions for many emerging applications, such as car access control, car sharing, remote parking, etc., which has triggered new applications for connected devices such as smartphones. A round of innovation.
    TI's automotive-grade low-power Bluetooth chips include CC2640R2F-Q1 And CC2541- Q1[/url], their differences are shown in the following table:
    [tr][ td=244]

    Standby current

    parameters	查看详情[ /p]
    Temperature range	-40°C to 105°C (Grade 2)
    Bluetooth specification[/p ]	Bluetooth v4.2 +	Bluetooth v4.0
    SW upgrade available for future BLE specification updates [/td][ td=288][p=21, null,center]√
    Supply Voltage Range	1.8 – 3.8 V	2.0 – 3.6 V
    Current Consumption@ Maximum RX Sensitivity Current Consumption @ TX Output Power 0dBm	[p=21, null, left center]6.2 mA 6.9 mA	18.3 mA 18.6 mA
    Operating system	√(TI-RTOS)
    On-chip DC-DC	√
    Shutdown current	150 nA	500 nA
    1 μA	1 μA
    MCU [/td ][td=288] 32-bit ARM Cortex-M3 (48 MHz)	8-bit 8051 (32 MHz)
    Embedded Flash / RAM	128 KB + 8 KB cache / 20 KB + On Chip ROM	256 KB / 8 KB
    Output Power Consumption	+5 dBm	0 dBm
    Receiver sensitivity	-97 dBm	-94 dBm
    Link budget	102 dB	94 dB
    Package	Car-grade RGZ QFN48-7x7 w	RHA QFN40-6x6 w
    Synchronous connection[/p ]	Up to 8 (Multi-Role)	Up to 3 (Central to Peripheral)
    GPIO [/td][t d=288] 31	23

    Table - 3
    TI mainly promotesCC2640R2F-Q1, its features are listed as follows:
    • Ultra-low power consumption: standby current is 1 μA, which can achieve long battery life and low space occupancy in automotive modules;
    • Excellent RF performance and ultra-long transmission distance: sensitivity up to 97dBm, link budget up to 102dB;
    • High reliability: AEC-Q100 certified, temperature range of -40°C to 105°C (Grade 2), wettable side package;
    • Flexible platform support: multi-core SoC with independent application and wireless domains, supporting Bluetooth 4.2 and Bluetooth 5.
    TI has corresponding evaluation board and software support:
    • [url=http://www.ti.com.SimpleLink CC2640R2 SDK - Bluetooth low energy[/url]
    For more technical support and learning materials, please visit:
    • TI Cloud Tools (dev.ti.com)
    • E2E Support Community (www.ti.com/ble-forum)
    • GitHub SW Repository (https://github.com/ti-simplelink)
    • BLE Wiki (www.ti.com/ble-wiki)