• Through the Freedom development board header J3 pin-8 by supplying voltage on signal P5-9V_VIN, this would supply
the FRDM-KW36 through LDO 3V3 (U16).
— An external LDO can be populated on header J26 to regulate P5-9V_VIN which feedbacks to header J3 pin-5
(P5V_USB). This LDO is not provided.
• From an external battery (Coin-cell – CR2032). Use selector J35 pins 2-3.
• From an external DC supply in the following ways:
— Connect an adapter that can supply 1.71 to 3.6 VDC to J35 pin 2. If the KW36 DC-DC is configured in buck mode,
then, the voltage should be in the range of 2.1 V to 3.6 V.
— Connect an adapter that can supply 12V to the connector J32, J23 pin 3 or J13 pin 2. This option is to power
CAN/LIN functionality in the board. At the same time, it also provides voltage to the regulator U15 which provides 5V
signal to P5V that also powers the KW36 through P3V3_LDO (U16). J35 needs to be in 1-2 position.
The jumper/headers J28 and J24 can supply current to various board components and can be used to measure the current (if
desired). Green LED marked as LED2 is available as a power indicator.
Power headers (J24, J28 and J35) can supply either the LED, MCU, or peripheral circuits. Measure the current by inserting a
current meter in place of a designated jumper. See
for details on jumper descriptions.
The FRDM-KW36 can be configured to use any of the DCDC converter operating modes. These modes are Bypass, Buck
(Manual-Start) and Buck (Auto-Start).
highlight the jumper settings for each of these
modes. The board is configured in Buck (Auto-Start) by default. If different DCDC mode is desired, cut traces (bottom layer of
the board) and jumpers (J27, J28, J29, J30, J31 and J38) should be populated to be able to configure the desired DCDC mode.
Figure 15. Jumper settings for Bypass mode
Figure 16. Jumper settings for Buck mode (manual start)
NXP Semiconductors
Functional description
FRDM-KW36 Freedom Development Board User’s Guide, Rev. 4, 01/2020
User's Guide
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