Functional description
FRDM-K32L3A6 Freedom Development Board, User’s Guide, Rev. B0, 09/2019
NXP Semiconductors
7
Figure 5. FRDM-K32L3A6 power management circuit
The FRDM-K32L3A6 board will typically be powered by a 5V source by one of the following means:
OpenSDA micro USB type B connector (J12)
K32L3A6 micro USB type B connector (J8)
Through the Freedom development board header J3 pin-10
Optional 5V regulator populated at J15
The 5V supply then powers an adjustable regulator, U43, and a 1.8V regulator, U45. The adjustable
regulator is preset to provide a nominal 3.3V output. The adjustable regulator output can be controlled
by connecting an external supply in series with a 3.9k resistor to J52-1. The external supply range of
0.9V to 2.7V will adjust the regulator output from 3.6V to 1.8V.
The K32L3A6 and supporting circuitry can then be powered using the adjustable regulator or a CR2032
coin cell selected by means of J18. The 1.8V regulator provides the ability to run the device with split
supplies.
Typical power supply configurations are shown in
Table 1
FRDM-K32L3A6 power supply configurations
Description
J10
J48
J14
J16
J19
Single Supply Operation, IO @ 3.3V
1-2
1-2
1-2
1-2
1-2
Single Supply Operation, RF & IO @ 1.8V
1-2
1-2
2-3
2-3
open
Dual IO, 3.3V and 1.8V
1-2
1-2
1-2
1-2
2-3
Full bypass
open
open
open
open
open
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