FRDM-KL43Z hardware description
FRDM-KL43Z User’s Guide, Rev. 1
NXP Semiconductors
5
to produce the main power supply. The other two sources are not regulated on-board.
provides the
operational details and requirements for the power supplies.
Note that the OpenSDA circuit is only operational when a USB cable is connected and is supplying power
to OpenSDA USB. However, protection circuitry is in place to allow multiple sources to be powered at
once.
Figure 3. Power supply schematic
Table 2. FRDM-KL43 power requirements
Supply source
Valid range
OpenSDA operational?
Regulated
on-board?
OpenSDA USB
5 V
Yes
Yes
KL43 USB
5 V
No
Yes
V
IN
Pin
4.3–9 V
No
Yes
3.3 V Pin
1.71–3.6 V
No
No
Coin cell battery
1.71–3.6 V
No
No
