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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Part Number
Marketing Status
Package
Grade
ECCN (US)
Budgetary Price (US$)*
Quantity
Country of Origin
Operating Temperature (°C) (max)
More info
Order from Distributors
Order from ST
STWBC-WATR
Active
VFQFPN 32 5x5x1.0 Industrial 3A991A2 2.5125 1000 PHILIPPINES 105
MORE INFO

Operating Temperature (°C) (min):

-40

Output Power (W) (typ):

2.5

No availability of distributors reported, please contact our sales office
STWBC-WA
Active
VFQFPN 32 5x5x1.0 Industrial 3A991A2 2.5125 1000 PHILIPPINES 105
MORE INFO

Operating Temperature (°C) (min):

-40

Output Power (W) (typ):

2.5

Check Availability

Distributor availability ofSTWBC-WA

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2 1 Order Now
RS COMPONENTS EUROPE 99 1 Order Now

Distributor reported inventory date: 2019-06-24

Distributor Name

DIGIKEY

Stock

2

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

99

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-06-24

Buy now

STWBC-WATR

Marketing Status

Active

Package

VFQFPN 32 5x5x1.0

Unit Price (US$)

2.5125*

Grade

Industrial

ECCN (US)

3A991A2

Unit Price (US$)

2.5125

Quantity

1000

Country of Origin

PHILIPPINES

(max)

105

Operating Temperature (°C)

(min)

-40

Output Power (W) (typ)

2.5

STWBC-WA

Marketing Status

Active

Package

VFQFPN 32 5x5x1.0

Unit Price (US$)

2.5125*

Distributor availability ofSTWBC-WA

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2 1 Order Now
RS COMPONENTS EUROPE 99 1 Order Now

Distributor reported inventory date: 2019-06-24

Distributor Name

DIGIKEY

Stock

2

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

99

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-06-24

Grade

Industrial

ECCN (US)

3A991A2

Unit Price (US$)

2.5125

Quantity

1000

Country of Origin

PHILIPPINES

(max)

105

Operating Temperature (°C)

(min)

-40

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

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS11797
      Digital controller for wireless battery charger transmitters for wearable and smartwatch applications
      1.0
      787.37 KB
      PDF
      DS11797

      Digital controller for wireless battery charger transmitters for wearable and smartwatch applications

    • Description Version Size Action
      AN5223
      2.5W wireless charger transmitter evaluation board deconfiguration guide for 1-watt wearable applications
      1.0
      4.08 MB
      PDF
      AN4900
      How to tune STEVAL-ISB038V1 wireless charging evaluation kit for wearable applications
      4.0
      1.1 MB
      PDF
      AN5223

      2.5W wireless charger transmitter evaluation board deconfiguration guide for 1-watt wearable applications

      AN4900

      How to tune STEVAL-ISB038V1 wireless charging evaluation kit for wearable applications

Publications and Collaterals

    • Description Version Size Action
      STWBC-WA - Wireless power for IoT devices 06.2018
      1.5 MB
      PDF

      STWBC-WA - Wireless power for IoT devices

    • Description Version Size Action
      Power Management Guide 06.2019
      5.5 MB
      PDF
      Products and solutions for Wearable devices 1.0
      2 MB
      PDF

      Power Management Guide

      Products and solutions for Wearable devices

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.