FRDM-K28F hardware description
Freedom Board for Kinetis K28F (FRDM-K28F), User's Guide, Rev. 0, 04/2017
NXP Semiconductors
5
Table 1. FRDM-K28F power requirements
Supply source
Valid range
OpenSDA v2.2 operational
Regulated on-board
OpenSDA v2.2 USB
5 V
Yes
Yes
K28F USB
5 V
No
Yes
P5-9V_VIN pin
5 V
–9 V
No
Yes
3.3 V VDD header (J18)
1.71 V
–3.6 V
No
No
1.8 V VDDIO_E header (J15)
1.71 V
–3.6 V
No
No
1.2 V VDD_CORE header (J22)
1.17 V
–1.32 V (RUN mode)
1.33 V
–1.47 V (HSRUN mode)
No
No
NOTE
The OpenSDA v2.2 circuit is only operational when a USB cable is
connected and supplies power to the OpenSDA v2.2 USB. However, a
protection circuitry is provided to enable multiple sources to be powered
at once. By default, the FRDM-K28F VDD_CORE = 1.2 V is operating in
the RUN mode. To operate in the HSRUN mode, supply 1.33 V–1.47 V
externally.
CAUTION
When 3.3 V is supplied directly through the Freedom platform
compatibility header J3, enable the protection diode D9 by opening the
J26 shorting header.
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