TWR-KW2xDxxx
Tower KW2xDxxx Hardware Reference Manual, Rev. 0.2
3-12
Freescale Semiconductor
— Shunt J27 to supply 5VDC to the MKW2xDxxx device (U3 pin 24, VREGIN) through the
Micro USB AB connector, This supplies the on-board USB regulator with then provides 3.3
VDC supply (U3 pin 23, VOUT33). See
Figure 3-8., “TWR-KW24D512 Schematic”
.
— Shunt J3 2-3 to supply power to the MKW2xDxxx device. See
Figure 3-8., “TWR-KW24D512
Schematic”
.
3.2.4.5
MKW21D256 (Non-USB) UART2 Support - TWR-MK21D256 Board Only
The MKW21D256 device does not support the USB interface and instead makes use of UART2 port
functionality. In this case, resistors are placed configuring UART2 use for both the TWRPI connector and
TWR elevator interface. (see
Figure 3-1., “TWR-KW2xDxxx Connector and Header Details”
).
•
UART2/Non USB Select
— J27 is open, shunt J3 1-2, supply voltage required though power management configuration.
See
Figure 3-8., “TWR-KW24D512 Schematic”
, and
Section 3.2.3, “Power Management”
.
— The following resistors are placed: R84, R85, R86 and R87, keep as DNP, C27 and C28. See
Figure 3-8., “TWR-KW24D512 Schematic”
.
