NXP Semiconductors NXQ1TXH5DB1355 User manual

UM11152
NXQ1TXH5DB1355 plugin board
Rev. 1 — 6 December 2018 User manual
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Keywords NXQ1TXH5DB1355, NXQ1TXH5DB1401, NXQ1TXH5, plugin board, LPC824
Abstract This manual describes how to use the NXQ1TXH5DB1355 board in
combination with a NXQ1TXH5 design. The document describes how to
connect the NXQ1TXH5DB1355 board to a PC and the NXQ1TXH5. This
enables engineers to verify operation of the NXQ1TXH5 in a customer
specific design. This eases the design of a wireless power transmitter using
the NXQ1TXH5.

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
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Revision history
Rev Date Description
v.1 20181206 first issue

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NXQ1TXH5DB1355 plugin board
UM11152 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
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1 Introduction
This document describes how to use the NXQ1TXH5DB1355 plugin board.
The NXQ1TXH5DB1355 board can be used in combination with the NXQ1TXH5DB1401
demo board or with a customer-specific design. The NXQ1TXH5DB1355 plugin board
contains a microcontroller, the LPC824M201JDH20. This microcontroller interfaces
between the I2C from the NXQ1TXH5 and the UART.
The NXQ1TXH5DB1355 can be used for the following tasks:
•Read out Qi operating phase (ping, power transfer, foreign object detected, fault state)
•Verifying parameter setup via configuration resistors
•Read out chip temperature, switching frequency
•Foreign power calibration
This information helps designers with the verification and testing of their NXQ1TXH5
application.

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.
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2 NXQ1TXH5DB1355 board connections
Figure 1. NXQ1TXH5DB1355 board connections
The NXQ1TXH5DB1355 board as shown in Figure 1 can be used in combination with the
TTL-232R- 3V3 cable from FTDI.
Table 1 shows the pinout of the connector on the FTDI cable. The NXQ1TXH5DB1355
board only uses GND, TXD, and RXD. The FTDI cable connects to header X4 of the
NXQ1TXH5DB1355 board.
Table 1. Pinout connector FTDI cable
Pin number Name Color Description
1 GND black device ground supply pin
2 CTS# brown clear to send control input/handshake signal
3 VCC red +5 V output
4 TXD orange transmit asynchronous data output
5 RXD yellow receive asynchronous data input
6 RTS# green receive to send control output/handshake signal
The NXQ1TXH5DB1355 is connected to the I2C interface of the NXQ1TXH5. The pull-
up resistors for the SDA and SCL lines are already on the NXQ1TXH5DB1355 board.
Connect the SDA, SCL, and GND pins of header X3 to the design with the NXQ1TXH5.
To power the components on the NXQ1TXH5DB1355 board, connect a 5 V supply to pin
9 and its GND connection. This supply can be obtained from a separate lab supply or
from the NXQ1TXH5 application.

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
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Table 2. Header X3 point
Pin number Name Description
1 GND device ground supply pin
2 DATA_S not used
3 GND device ground supply pin
4 WS not used
5 GND device ground supply pin
6 BCK not used
7 SDA serial data
8 SCL serial clock
9 +5V device 5 V supply pin
10 +5V device 5 V supply pin

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NXQ1TXH5DB1355 plugin board
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3 Logging with the NXQ1TXH5DB1355 board
The UART output of the NXQ1TXH5DB1355 board can be viewed in a terminal program
like Putty or Teraterm. This chapter describes how to install and set up these tools.
3.1 Installation
•Download and install the FTDI driver from http://www.ftdichip.com/Drivers/VCP.htm
•Install Teraterm from http://ttssh2.osdn.jp
Figure 2. NXQ1TXH5DB1355 board connected to NXQ1TXH5DB1401 board
•Connect the NXQ1TXH5DB1355 board to the NXQ1TXH5DB1401 board as indicated
in Figure 2.
•Start Teraterm and select the right COM port
•Go to Setup > Serial port and set the values as indicated in Figure 3.

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
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Figure 3. Serial port settings in terminal program
•Supply power to the NXQ1TXH5DB1401 board and you see the message as indicated
in Figure 4.
Figure 4. Message after power-up
•Place a receiver on the charging pad.
•Click in the black terminal screen and type “version” followed by pressing the Enter key.
The word “version” is not displayed on the screen when local echo is off.
Figure 5. Message after typing “version” (see Section 4.1 for an explanation)
•Click in the black screen and type "log" followed by clicking Enter. The word "log" is not
displayed on the screen when local echo is off.

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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
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You see messages scrolling by as indicated in Figure 6.
Figure 6. Messages scrolling over the screen during charging (see Section 4.2 for an
explanation)

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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
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4 Commands and messages
This chapter explains the two commands that can be sent from a terminal to the
NXQ1TXH5DB1355 board and the response to those two commands.
4.1 Version
The values that are shown after typing "version" can be used to verify if the correct
parameters are set with the configuration resistors.
• LED mode
Indicates the LED mode that is selected with the resistor that is connected to the CNF4
pin.
• fod thr
Indicates the threshold level for the foreign object power (FOD_T in mW) that is
selected with the resistor to the CNF3 pin.
• fod e
Indicates the value of the equivalent loss resistance (FOD_E in mOhm) that is set with
the resistor to the CNF2 pin.
• cur limit
Indicates the current limit (mA) that is set with the resistor to the CNF1 pin.
• vbat limit
Indicates the voltage (mV) where the Smart Power Limiting (SPL) becomes active.
• ping duty
Duty cycle during the ping.
• ping freq
Frequency during the ping.
• pwm min freq
Minimum operating frequency of the NXQ1TXH5.
Figure 7 shows the connection of the configuration resistors. For more information
on this topic, see the application note "NXQ1TXH5/101 one-chip 5 V Qi wireless
transmitter" (Ref. 1), which is available from the NXP website.
aaa-031702
ADC
CNF1
CNF_IN
5 V
CNF2
CNF3
CNF4
SPR/SPL
FOD-E
FOD thres
config
5 V
R11
R7 R8 R9 R10
Figure 7. NXQ1TXH5 configuration

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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
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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 * Icrms2 / 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)