ST STEVAL-ISB68WTX, Руководство пользователя, Страница: 3 / 18

2 Board configuration
The configuration settings of the STWLC68JRF chip are retrieved from the OTP memory at power-up, but they
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 delivering 2.5 W using 5 V supply
• The output load to be adjusted gradually in steps of 10 mA to avoid high load transient
• The output current limit is set to 2 A
• The inverter maximum operating frequency set to 205 kHz, minimum operating frequency set to 110 kHz
• The duty cycle range minimum 20%, maximum 50%
• The ping frequency is set to 150Khz, ping interval set to 2seconds
• External TX device monitor feature is enabled
• TX Ping is disabled when external TX is detected
• TX Control Error Packet (CEP) time out set to 800msecs
• Frequency HOP frequency used in case of ASK modulation failure is set to 2900 Hz
• Control Error Packet time out max count set to 6
• Following interrupts are enabled by default
–
Over Temperature Protection Interrupt (OTP)
– Over Current Protection Interrupt (OCP)
– End of Power Transfer Packet Interrupt (EPT)
– EXT TX device detect interrupt
• Switch to Qi TX Mode is disabled, need to enable it for starting TX mode
• Enable Tx ping can be used to start the ping (default it is enabled) disable TX ping
• Disable TX ping can be used to stop the Ping (power transfer will be terminated)
• Enable FOD detection (default it is disabled)
• Following Default Protection Threshold settings used
• Over Temperature Protection at 90 °C
• The default setting for the over-temperature protection consists in disabling the TX inverter output in case
one of the temperature sensors detects more than 90 °C
• Over Current Protection (OCP) at 2 A resulting in Tx Inverter output disconnection
• Over Voltage Protection (OVP) at 10 V resulting in Tx inverter output disconnection
2.1 Board configuration and test points
The STEVAL-ISB68WTX has several connectors and test points to ease access to key signals.
UM2901
Board configuration
UM2901 - Rev 1
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