NXP Semiconductors
UM11152
NXQ1TXH5DB1355 plugin board
UM11152
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2018. All rights reserved.
User manual
Rev. 1 — 6 December 2018
11 / 15
When the receiver is placed on the charger, it sends the values for the "maximum power
value" and "power class" to the charger in the configuration packet (0x51).
In practice, "Power Class" is 0 and the "Maximum power value" is 10 so the RPP value
must be multiplied with 39.06 mW to get the value for prx.
The third byte indicates a checksum: it is the ExOr of the first 2 bytes.
If a Qi 1.0 receiver is placed on the charger, then there is no power reported by the
receiver but the charger assumes prx = 5 W for the FOD calculation.
The logging also gives information about the state in which the charger is:
•
State transfer: The charger is charging
•
State fod: The charger is in protection because the fod is triggered
•
State fatal: The charger is in protection because the receiver has sent a Qi error
message e.g. "internal fault", "battery fault", etc.
•
State overtemp: The charger is in protection because the internal or external
overtemperature protection from the charger has been triggered.