TWRKL43ZUG Tower Module, User’s Guide, Rev. 1, 08/2014
Freescale Semiconductor, Inc.
Hardware description
6.7
UART
UART2 can be connected to OpenSDA or TWR-Elevators through jumpers J3 and J5.
J3 UART2_TX_TGTMCU – PTE22/UART2_TX
J3 UART2_RX_TGTMCU – PTE23UART2_RX
Figure 4. UART2 connection to OpenSDA CDC serial/elevator
6.8
Infrared port
An infrared transmit and receive interface is implemented as shown in
Figure 5
. The LPUART0_TX
(PTE20/ ADC0_DP0/LPUART0_TX) pin directly drives an infrared diode. The receiver uses an infrared
phototransistor connected to LPUART0_RX (PTE21/ ADC0_DM0/ UART0_RX) through a low-pass
filter.
Figure 5. Infrared circuit
6.9
Accelerometer
An FXOS8700CQ 6-Axis Xtrinsic sensor with integrated linear accelerometer and magnetometer is
connected to the MKL43Z256VLH4 MCU through I
2
C module, I
2
C1, and GPIO/IRQ signals, PTD6 and
PTD7. The device can be configured to generate inertial wake-up interrupt signals from any combination
of the configurable embedded functions allowing the FXOS8700CQ to monitor events and remain in a
