TWRKL43ZUG Tower Module, User’s Guide, Rev. 1, 08/2014
10
Freescale Semiconductor, Inc.
TWR-KL43Z jumper options
6.13
USB
The MKL43Z256 features USB full-speed slave controller with on-chip transceiver and 5 V to 3.3 V
regulator, supporting crystal-less recovery. The TWR-KL43Z routes the USB D+ and D- signals from the
KL43Z256 MCU directly to the on-board USB connector (J21).
7
TWR-KL43Z jumper options
NOTE:
Default configuration for power is OpenSDA USB with 3.3V voltage
selection.
Table 5. Jumper options
Jumper Function
Jumper
Default
Position
Jumper Option
KL43 Pin Name
Board power selection
J28
1-2
1-2 P5V_TRG_USB
2-3 VBUS_ELEV
J25
Open
1-2 P5V_KL43_USB
VREG input power selection
J16
1-2
1-2 P5V_TRG_USB
2-3 VBUS_ELEV
P5V_VREGIN_K
L43
J19
Open
1-2 P5V_KL43_USB
P5V_VREGIN_K
L44
Voltage level selection
J35
1-2
1-2 3.3V
2-3 1.8V
VREFH isolation (when onchip
VREF module enabled)
J38
Open
1-2 VREFH to VDDA
VREFH
Digital part of MCU power
J12
1-2
Open - VDD isolated from
MCU_POWER
VDD1, VDD2
Analog part of MCU power
J10
1-2
Open - VDDA_HDR
isolated from
MCU_POWER
VDDA
Isolation between board and
MCU power
J17
1-2
Open - V_BRD isolated
from MCU_POWER
Isolation between MCU
VOUT33 and MCU power
J11
Open
1-2 VOUT_3V3 to
MCU_POWER
VLL3 to VDD enable
J36
Open
1-2 VLL3 to VDD enable
VLL3
