6.6 Typical performance characteristics
6.6.1 Power-up waveforms
The following figure shows a typical power-up sequence when the device is supplied from USB PD.
When the digital core is awake and all checks are done, the device switches the USB PD to a 5 V mode and its
Vbuck into a 3.6 V mode to lower the power consumption. After that, the device raises the USB PD voltage to 9 V
and Vbuck to 5 V before each digital ping and returns it back if there is no response to the ping.
Note: The device performs digital ping because there is an object placed on the Tx coil. If no object is present after
startup, only analog ping is performed.
Figure 40. Device power up
UM3286
STEVAL-WBC2TX70 description
UM3286 - Rev 1
page 58/84
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