NXP Semiconductors
UM11152
NXQ1TXH5DB1355 plugin board
UM11152
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© NXP B.V. 2018. All rights reserved.
User manual
Rev. 1 — 6 December 2018
10 / 15
4.2 log
The log command is used to toggle the logging on and off. When the logging is on,
the NXQ1TXH5DB1355 board sends the commands which are explained below to the
terminal.
The number at the beginning of each line is the timestamp. It is the time (in msec) that
has passed since the receiver was placed on the charger. The keywords after timestamp
can be:
• freq
Operating frequency (Hz) of the charger.
• dut
Duty cycle (%) of the full bridge in; generally, it is at 50 %.
• dcvolt
Supply voltage (mV) of the NXQ1TXH5.
• Icrms
RMS current (mA) through the coil. The calculation of this current is based on the
voltage that is measured on pin VSEN.
• ptx
Input power (mW) of the full bridge. It excludes the dissipation in LEDs.
• prx
Received power (mW) that the receiver reports. This power is not the power received in
the load, but the power received in the magnetic field.
• ppad
Calculated loss in the charger (mW). ppad = FOD_E * Icrms
2
/ 1000. When the value of
FOD_E is not correct, the calculated loss is wrong.
• pfor
Calculated foreign power (mW). pfor = ptx − ppad − prx.
• temp
Temperature (°C) of the NXQ1TXH5 chip.
• qidata: <headerid> <data> <checksum>
–
<headerid> specified in the Qi specification
–
<data> payload, length is dependent on headerid.
–
<checksum>, the exor function of the headerid and all data bytes
Two important qidata messages are described below:
•
qidata
03
00 03 control error packet (CEP) message
The first byte indicates the message ID, in this case the CEP message. The second
byte shows the content of the message. It is a two's complement signed integer that
ranges from −128 to +127.
–
Values > 0 indicate that the receiver wants to receive (much) more power.
–
Values < 0 indicate that the receiver wants to receive (much) less power.
During most of the time the receiver receives the correct amount of power, so the CEP
message is "03 00 03".
•
qidata
04
81 85 received power packet (RPP) message
The first byte indicates the message, in this case the RPP message. The second byte
shows the content of the message. It is an unsigned integer that ranges between 0 and
256. The received power can be calculated with
Equation 1
:
(1)