Functional description
FRDM-K32L3A6 Freedom Development Board, User’s Guide, Rev. B0, 09/2019
6
NXP Semiconductors
2.3.1 Virtual serial port
A serial port connection is available between the OpenSDAv3.0 MCU and pins PTC7 and PTC8 of the
K32L3A6.
NOTE
To enable the Virtual COM features, a driver must be installed. Download the driver at
https://developer.mbed.org/handbook/Windows-serial-configuration
3 Functional description
The six-layer board provides the K32L3A6 and power supply with a DC-DC Buck converter, and
Bypass modes. The layout for this base-level functionality can be used as a reference layout for your
target board.
3.1 Clocks
The FRDM-K32L3A6 board provides a 32.768 kHz to provide an accurate low power time base:
32.768 kHz Crystal Oscillator (for accurate low-power time base)
o
A 32.768 kHz crystal Y1 is provided
o
Internal load capacitors provide the entire crystal load capacitance
o
To measure the 32.768 kHz oscillator frequency, enable the RTC_CLKOUT signal to be
available on the TAMPER1 pin. This can be observed at J4-3
3.2 Power management
There are several different ways to power and measure current on the FRDM-K32L3A6 board. The
FRDM-K32L3A6 power distribution scheme is shown in
Figure 5
:
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from