ST STEVAL-ISB68WTX Operation & User’s Manual

STWLC68JRF can deliver up to 2.5 W power to a Qi complaint wireless receiver. Fully integrated STWLC68JRF require few external components for board design and can work with 5-20 V input power supply. With External USB-to-I2C bridge, the ...

The board features: • STWLC68JRFwireless power transmitter chip with up to 2.5 W output power capability • Low power applications with 5 V input voltage (supplied externally or USB adapter) • Very few external components, optimized BOM and PCB spac ...

can be temporary changed via GUI once the ISB68WTX is powered and the modified values are kept until a reset of chip occurs. The default STWLC68JRF settings are the following: • The coil and resonant capacitors are designed for de ...

Figure 3. STEVAL-ISB68WTX layout 2.2 Connection to USB I2C converter board Connect external USB converter board to P3 connector, please ensure right connections for GND, SDA, SCL pins , as shown in below picture. UM2901 Connection to USB I2C converter board UM2901 - Rev 1 page 4/18 ...

2.3 USB to I2C converter board The USB to I2C bridging dongle is the tool that allows interfacing the receiver to the Graphical User Interface running on a PC. Three LEDs monitor the operation of the bridge: D1 (green) indicates I2C bus activity. D2 (red) indicates correct initialization of the U1 chip D3 (yell ...

The power to the board can be supplied using 5V/2A USB adapter, connected through J1 (microUSB receptacle) or using external 5V power source. Ensure a stable supply using high quality cables with minimal DC resistance for best overall efficiency. 2.5 Board configuration The configuration settings of the STWLC68JRF chip are retrieved fr ...

The TX is responsible for controlling the transmitting coil and generating the correct amount of power requested by the RX. The RX continuously provides the transmitter with the correct power level requested, by modulating the transmitter carrier through the controlled resis ...

3.2 Communication and control The 32-bit core MCU is the supervisor of the whole device and manages all the functional blocks to establish and maintain communication with the receiver. Ensure adherence to Qi standard specifications (wherever required), optimize the efficiency by properly adjusting the operating point and guarante ...

3.4 FOD STWLC68JRF has FOD detection feature. Any excess power loss in wireless power transfer can be monitored and the device can stop power transfer. The FOD detection is enabled by setting TX_FOD_EN bit to 1 in register 0x0021h. The AUTO FOD detection threshold can be set in AUTO_FOD_THR register 0x00EBh. FOD is detected ...