ST STEVAL-ISB68WA, User Manual, Page: 4 / 18

Figure 4. Receiver module wiring
Additional control signals and programmable general-purpose I/O pins are available at the STWLC68JRH, but
they are not used in the module to keep the reference solution as simple as possible. The STWLC68JRH chip can
handle up to 400 kHz speed over the I2C bus.
Table 2 summarizes the default STWLC68JRH settings that are
retrieved from OTP memory at power-up. Values eventually changed via I2C registers are lost if the receiver
module is removed from the transmitter, unless VOUT or VRECT rails are externally kept above 4V (e.g. as per
Figure 7 b).
Table 2. Receiver module default settings
Parameter Default setting
Output voltage 5.0 V
Minimum VRECT 4 V (output is disconnected if VRECT voltage is lower than this value)
Dummy load 40 mA (minimum load current to ensure ASK communication stability)
Nominal chip idle current consumption 17 mA (application dependent)
Output current threshold for deeper ASK
modulation
100 mA (if the output current is higher than this value, auxiliary
modulation pins CLAMP1 and CLAMP2 are activated)
GPIO0 pin function Open drain, low when output is enabled (D3 LED)
INT pin function
Open-drain, low in case of over-temperature, over-current or over-
voltage condition.
Over-Temperature protection
Lower 80°C threshold leading to output disconnection and EPT
generation to terminate power transfer. Upper 125°C threshold leading to
AC1 and AC2 pins short-to-ground.
Over-Voltage protection (VRECT rail)
Lower 12 V threshold leading to temporary IEXT activation (VRECT
clamping). Upper 25 V threshold leading to AC1 and AC2 pins short-to-
ground.
Over-Current protection
1.5 A threshold leading to output disconnection and EPT generation to
terminate the power transfer.
UM2693
Wireless power receiver module
UM2693 - Rev 1
page 4/18