NXP Semiconductors
QN9090
QN9090-DK006 Development Kit User Guide
UM11355
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© NXP Semiconductors N.V. 2020. All rights reserved.
User Guide
Rev.1.0
— 15 January 2020
8 of 19
low.
DS5, DS6
2x Green LEDs connected respectively to UART0_Tx (DS5) and
UART0_Rx (DS6). LEDs will flash any time there is activity on the
UART0.
DS8
In System Programming (ISP) LED indicator. LED is ON when IO5_ISP
is pulled low and when SW2 button is pressed.
2.4 ARDUINO connectors
ARDUINO compatible connectors are based on Arduino R3.
References on the DK6 board are CN1, CN2, CN3, CN4.
The Generic expansion board OM15082 can be plugged into these connectors.
2.5 Buttons
2.5.1 Reset button
This button (SW4) is used to reset the QN9090 (note that the Link2 is NOT reset by this
button)
2.5.2 ISP button
This button connects the QN9090_PIO5 (ISP_Entry) pin to ground. This should be used
to set the QN9090 in ISP mode to program a binary file into the chip memory.
To force entry into this ISP mode, hold down the ISP button (SW2), press and release
the Reset button (SW4), then release the ISP button (SW2). This is done automatically
when using the DK6 Production Flash programmer with J2 (FTDI USB interface)
2.6 User Interface button
This button (BP1) is connected to QN9090_PIO_1 and should be used as an input
2.7 QN9090 Serial port
The QN9090 UART0 can also be connected through a virtual communication port
(VCOM) UART bridge Link2 function either to a host computer connected to the J2 USB
FTDI or to J15 USB Link2. By default, the DK 6 is configured to use the FTDI USB.
For Link2 USB: The factory default CMSIS-DAP Link2 image includes UART bridge
functionality (VCOM support), and this firmware is also available with the LPCScrypt
utility, available at https://www.nxp.com/design/microcontrollers-developer-resources/lpc-
microcontroller-utilities:LPC-UTILITIES power connections and measurements.
For the USB FTDI, the PC driver is available on FTDI website (the FTDI chip is already
configured before the carrier board release).
2.8 Board power connections
A block diagram of the board power tree is shown in Figure 5. When the QN9090 Target
is to be debugged from the on board Link2 probe, the USB mini B-type connector (J15)
