Texas Instruments SWRU294, User Manual, Page: 29 / 57

SWRU294
Page 29/40
7.2.2 Power SmartRF TrxEB from external power source
Connect the power from the external power source to the external power source connector on
SmartRF TrxEB and set the power source selection jumpers accordingly. Please see section
6.3.3 for a detailed description on how to power the SmartRF TrxEB from an external power
source.
7.3 Connect signals
7.3.1 Common signals
Table 12 shows the common signals needed to communicate with transceivers on a mounted EM
board. Figure 20 shows where the signals listed Table 12 and Table 13 can be found on the P7
EM I/O breakout header on SmartRF TrxEB.
TrxEB Signal Name TrxEB breakout pin Description
RF_RESET_N P7.10 Signal used to reset EM board
RF_SPI0_SCLK P7.12 EM SPI interface clock signal
RF_SPI0_CS_N P7.14 EM SPI interface chip select signal, active low
RF_SPI0_MOSI P7.16 EM SPI interface MOSI signal
RF_SPI0_MISO P7.18 EM SPI interface MISO signal
GND P7.20 Common ground for EB and external MCU board
Table 12
– Strapping overview to connect common signals to an external MCU
NOTE: When powering the SmartRF TrxEB from an external power source, the TrxEB main
power switch must be in on position for the EB to be powered up.