UM1759 datasheet(17/50 Pages) STMICROELECTRONICS

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UM1759

Hardware description

3.3.4

Band

The STEVAL-IDS001Vx has 4 different possible BOM lists, each one optimized for different

RF band as follow:

•

315 MHz

•

433 MHz

•

868 MHz

•

915 MHz

The chip antenna used supports all these four bands of frequency.

3.3.5

RF connector

The STEVAL-IDS001Vx provides two different RF connections: antenna (chip antenna

tuned for all the supported bands, default configuration) and UFL connector. Although the

default configuration allows communication on air, can be useful switch to the UFL

connector to connect the STEVAL-IDS001Vx to RF equipment as spectrum analyzer or RF

signal generator. To switch from antenna to UFL connector the C9 capacitor must be

removed and the C36 capacitor must be soldered. To restore the default configuration and

use the antenna the C36 capacitor must be removed and the C9 capacitor must be

soldered. In Figure 13, the two pads for C9 and C36 are showed together with the chip

antenna and UFL connector. According to the particular BOM, for each band, the value of

C36 is equals to C9.

Figure 13. RF connector scheme

3.3.6

Push buttons

For user interaction the board has two buttons both available to the application, G in F

Figure 11.

3.3.7

LEDs

Two LEDs are available (H in Figure 11).

•

D1: yellow.

•

D2: green.

UM1759 Datasheet(PDF) 17 Page - STMicroelectronics