STWBC-WA

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Digital controller for wireless battery charger transmitters for wearable and smart watches applications

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  • The STWBC-WA is STMicroelectronics’ wireless battery charger transmitter application optimized for wearable usage.

    Thanks to its 5 V native supply, the STWBC-WA device is ideal to operate with USB power supplies.
    Wireless battery charging systems replace the traditional power supply cable by means of electromagnetic induction between a transmitting pad or dongle (TX) and a battery-powered unit (RX), such as a smartwatch or sports gear.
    The power transmitter unit is responsible for controlling the transmitting coil and generating the correct amount of power requested by the receiver unit. The receiver unit continuously provides the transmitter the correct power level requested, by modulating the transmitter carrier through controlled resistive or capacitive insertion. Generating the correct amount of power guarantees the highest level of end-to-end efficiency due to reduced energy waste. It also helps to maintain a lower operational temperature.
    The digital wireless battery transmitter can adapt to the amount of energy transferred by the coil by modulating the frequency, duty cycles or coil input voltage.

    Key Features

    • Digital controller for wireless battery charger transmitters
    • Optimized for < 3 W applications
      • Smartwatches and healthcare
      • Internet of Things (IoT) battery-powered smart devices
      • Remote controllers
    • Cost effective half-bridge topology with integrated drivers
    • Optional full-bridge configuration for 3 W applications
    • VIN range: 3 V to 5.5 V
      • Supports USB VIN
    • Active presence detector
    • Parametric customization via graphical interface
    • 2 firmware options:
      • Turnkey solution for quick design
      • APIs available for application customization
    • Peripherals available via APIs
      • ADC, with 10-bit precision
      • UART
      • I2C master fast/slow speed rate
      • GPIOs
    • Memory
      • Flash and EEPROM with read-while-write (RWW) and Error Correction Code (ECC)
      • Program memory: 32 Kbytes Flash; data retention: 15 years at 85 °C after 10 kcycles at 25 °C
      • Data memory: 1 Kbyte true data EEPROM; data retention: 15 years at 85 °C after 100 kcycles at 85 °C
      • RAM: 6 Kbytes
    • Transmitter reference design:
      • Evaluation board order code: STEVAL-ISB038V1T
      • 2-layer PCBs
      • Active object detection
      • Graphical user interface for application monitoring
      • Interoperable with receiver: STEVAL-ISB038V1R
    • Operating temperature
      • -40 °C up to 105 °C
    • Package
      • VFQFPN32

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Related Applications

Power Supplies and Converters

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      STSW-ISB045FW

      Active

      Firmware for the STEVAL-ISB045V1 wireless charger transmitter evaluation kit based on STWBC-WA

      Evaluation Tool Software ST

      STSW-STWBCFWDT

      Active

      STWBC firmware downloader tool

      Evaluation Tool Software ST

      STSW-STWBCGUI

      Active

      Graphical user interface for wireless power transmitter evaluation boards based on the STWBC chip family

      Evaluation Tool Software ST
      STSW-ISB045FW

      Description:

      Firmware for the STEVAL-ISB045V1 wireless charger transmitter evaluation kit based on STWBC-WA
      STSW-STWBCFWDT

      Description:

      STWBC firmware downloader tool
      STSW-STWBCGUI

      Description:

      Graphical user interface for wireless power transmitter evaluation boards based on the STWBC chip family
    • Part number
      Status
      Description
      Type
      Supplier

      STEVAL-ISB045V1

      Active

      2.5 W wireless charger transmitter evaluation kit

      PSU and Converter Solution Eval Boards ST
      STEVAL-ISB045V1

      Description:

      2.5 W wireless charger transmitter evaluation kit

CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STWBC-WA
Active
VFQFPN 32 5x5x1.0 Industrial Ecopack2
STWBC-WATR
Active
VFQFPN 32 5x5x1.0 Industrial Ecopack2

STWBC-WA

Package:

VFQFPN 32 5x5x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFQFPN 32 5x5x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STWBC-WATR

Package:

VFQFPN 32 5x5x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFQFPN 32 5x5x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Grade
Budgetary Price (US$)*/Qty
More info
min
max
STWBC-WATR No availability of distributors reported, please contact our sales office
Active
3A991A2 NEC Tape And Reel VFQFPN 32 5x5x1.0 -40 105 Industrial 2.5125 / 1k
MORE INFO

Unit Price (US$):

2.5125

Country of Origin:

CHINA

Output Power (W) (typ):

2.5

STWBC-WA Available at 3 distributors

Distributor availability ofSTWBC-WA

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 804 1 Order Now
RS COMPONENTS EUROPE 89 1 Order Now
ANGLIA Live EUROPE 50 1 Order Now

Distributor reported inventory date: 2020-10-17

Distributor Name

DIGIKEY

Stock

804

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

89

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

50

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-17

Active
3A991A2 NEC Tray VFQFPN 32 5x5x1.0 -40 105 Industrial 2.5125 / 1k
MORE INFO

Unit Price (US$):

2.5125

Country of Origin:

CHINA

Output Power (W) (typ):

2.5

STWBC-WATR

Marketing Status

Active

ECCN (US)

3A991A2

Budgetary Price (US$)*/Qty

2.5125 / 1k

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 32 5x5x1.0

Operating Temperature (°C)

(min)

-40

(max)

105

Grade

Industrial

Budgetary Price (US$)* / Qty

2.5125 / 1k

Country of Origin

CHINA

Output Power (W) (typ)

2.5

STWBC-WA

Marketing Status

Active

ECCN (US)

3A991A2

Budgetary Price (US$)*/Qty

2.5125 / 1k

Distributor availability ofSTWBC-WA

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 804 1 Order Now
RS COMPONENTS EUROPE 89 1 Order Now
ANGLIA Live EUROPE 50 1 Order Now

Distributor reported inventory date: 2020-10-17

Distributor Name

DIGIKEY

Stock

804

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

89

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

50

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-17

ECCN (EU)

NEC

Packing Type

Tray

Package

VFQFPN 32 5x5x1.0

Operating Temperature (°C)

(min)

-40

(max)

105

Grade

Industrial

Budgetary Price (US$)* / Qty

2.5125 / 1k

Country of Origin

CHINA

Output Power (W) (typ)

2.5

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors