UM1657 Datasheet, PDF (23/48 Pages) STMicroelectronics – SPIRIT1 development kit

UM1657
Figure 9. STEVAL-IKR001Vx
Hardware description
1.6.2
STEVAL-IKR001Vx (RF module)
The RF module includes 5 different possible BOM lists, on the same layout PCB. Each one
optimized for different RF band as follow:
 169 MHz
 315 MHz
 433 MHz
 868 MHz
 915 MHz
The band indication is reported with a dummy resistor on the board, in A Figure 10.
A SMA connector on the RF module, in B Figure 10, allows connection with RF instruments
as spectrum analyzer and signal generator to the SPIRIT1 by RF cable or also connect an
antenna as the one included in the demo kit. The board is powered through the RF
daughterboard connector, in D Figure 10, by the RF motherboard and communicates
through this connector by SPI and some GPIOs with the microcontroller.
The VCC_RF pin of the RF daughterboard connector is linked to the Vbat of the SPIRIT1
through a jumper that can be also removed to measure the current consumption, in C
Figure 10.
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