3.2 xWR6843ISK/IWR6843ISK-ODS Block Diagram
shows the functional block diagram.
Figure 3-5. Block Diagram of xWR6843ISK/IWR6843ISK-ODS
3.3 PCB Storage and Handling Recommendations
The immersion silver finish of the PCB provides a better high-frequency performance, but is also prone to
oxidation in open environments. This oxidation causes the surface around the antenna region to blacken.
To avoid oxidation, the PCB should be stored in an ESD cover and kept at a controlled room temperature with
low humidity conditions. All ESD precautions must be taken while using and handling the EVM.
3.4 Power Connections
The antenna module is powered by the 3.3 V from the 60-pin HD connectors. When power is supplied, an on-
board PMIC and LDO generate the voltages. The PGOOD LED glows to indicate all voltage rails are in limits.
Note
After the 3.3-V supply is provided to the EVM, TI recommends toggling the NRST signal once to
ensure a reliable boot-up state; this signal is accessible on the 60-pin HD connector.
3.4.1 Higher Power Applications
For higher power application tespoint T13 (5V) and T12 (GND) can be used to supply power the EVM.
xWR6843ISK / IWR6843ISK-ODS REV C
34
mmWaveICBoost and Antenna Module
SWRU546D – OCTOBER 2018 – REVISED NOVEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
