Silicon Radar SiRad Easy, Manual, Page: 5 / 14

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Evaluation Kit SiRad Easy® r4, SiRad Easy® & SiRad Simple®
User Guide Version 2.5 19-Nov-2021
1.2 Application
SiRad Easy® r4, SiRad Easy® and SiRad Simple® are supposed to be used for short-term evaluation purposes in
laboratory environments. Please see our disclaimer at the end of this document.
IMPORTANT:
The radar front ends are able to use a larger bandwidth than what is allowed in the ISM bands. In most
countries, the bandwidth is limited to 1 GHz between 122 GHz and 123 GHz for production purposes by law.
Please check your local regulations. It remains the customer’s responsibility to assure the operation of the front
end according to local regulations, especially when applying to frequency band allocations outside of the
laboratory environment. Silicon Radar and its distributors will not accept any responsibility for consequences
resulting from the disregard of these instructions and warnings.
2 Hardware Setup SiRad Easy® r4
2.1 Changing the Radar Front End
Figure 2 shows SiRad Easy® r4 with a 122 GHz radar front end board mounted. Follow the instructions below for
changing the front end board.
Figure 2 122 GHz configuration with lens assembled
Disassembly

Disconnect the power from the Evaluation Kit.

Remove the radar front end from the top of the baseband board. Press thumbs and index fingers under
the edges of the radar front end board and pull and press it simultaneously straight out of its connections.
Do not tilt or bend the front end board.
Assembly

The radar front end board can only be connected one way. Place the radar front end board centered onto
the connectors, then press it down until no space is left.
2.2 UART Data Connection & External Power (External UART Header)
The UART header in Figure 3 provides an alternative way to power and connect to the board using a second UART
port. The
Base Board can be powered from the 5V and GND lines of the port. The UART header can also be used
to trigger measurements manually via the trigger line (TI), or receive triggers on each ramp start (TO). Also see the
section about trigger options in the
Protocol Description .