UART to Wi-Fi Bridge with 24 VAC Power Reference Design


Design files


This reference design uses our SimpleLink Wi-Fi CC3200 internet-on-a-chip wireless MCU module to create a data bridge between existing hardware with a logic-level UART interface and a Wi-Fi network. The design also contains a simple switcher power supply with a wide-input range suitable for 24-V HVAC systems. The UART interface has buffers to allow this design to interface with equipment that has logic levels between 3.3 V and 5 V.

  • Simple switcher power supply with a wide input voltage range of 18 V to 30 V AC and 12 V to 48 V DC
  • Cortex M4 provides adaptability to customer communication protocols
  • UART input with logic-level translator can be used with 3.3 V or 5 V logic
  • Enables adding a Wi-Fi data stream to existing hardware without needing a hardware redesign
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUA40A.PDF (2234 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Detailed overview of design layout for component placement

TIDRFF7.ZIP (1599 K)

Files used for 3D models or 2D drawings of IC components

TIDCAI1.ZIP (2282 K)

Design file that contains information on physical board layer of design PCB

TIDRFF6.PDF (1752 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LMR16006SIMPLE SWITCHER® 4V to 60V, 600mA Step-Down Regulator with Low Iq

Data sheet: PDF | HTML
ESD & surge protection ICs

TPD1E10B0612-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package

Data sheet: PDF | HTML
Fixed-direction voltage translators

SN74LV1T34Single Power Supply BUFFER Logic Level Shifter (no enable)

Data sheet: PDF | HTML
Wi-Fi products

CC3100SimpleLink™ 32-bit Arm Cortex-M3 Wi-Fi® wireless network processor

Data sheet: PDF | HTML
Wi-Fi products

CC3100MODSimpleLink™ Wi-Fi CERTIFIED™ network processor module for Internet-of-Things with 2 TLS/SSL

Data sheet: PDF
Wi-Fi products

CC3200SimpleLink™ 32-bit Arm Cortex-M4 Wi-Fi® wireless MCU with 2 TLS/SSL and 256kB RAM

Data sheet: PDF | HTML
Wi-Fi products

CC3200MODSimpleLink™ 32-bit Arm Cortex-M4 Wi-Fi® and Internet-of-Things wireless module

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide UART to Wi-Fi Bridge With 24-V AC Power Design Guide (Rev. A) Jul. 23, 2015
Technical article Add connectivity to existing hardware with our UART to Wi-Fi bridge Sep. 08, 2015

Related design resources

Reference designs

TIDA-00380 CAN to Wi-Fi Gateway Reference Design TIDA-00485 Non-Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design TIDA-00486 Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design

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