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I encountered the following problem while debugging CC3135. Can you help me answer it.
We use SOP0 and SOP1 as control pins for switching between 5Gwifi TX and RX switches.
However, when testing 5GWIFI, we found that while the MCU was communicating with CC3135, the output levels of SOP0 and SOP1 were 92mv
However, when the communication between MCU and CC3135 is disconnected, and the PC is connected to the EMU board, and the EMU board is connected to
CC3135 (with TX, RX, GND, NHIB, RTS, CTS ports), the output levels of SOP0 and SOP1 are 3.3v.
May I ask what is the reason for this phenomenon? Is there any configuration that hasn't been done? How can I solve these problems?
Greetings,
When you gathered these values what was the device state, was it trying to output a 5Ghz RF signal on both situations? Have you provided a pull down resistor to GND on pins 21, 34 and 35 as mentioned in our CC3x35 Hardware Design Checklist (Rev. A) and CC3135, CC3235 SimpleLink
Wi-Fi® and IoT Solution Layout Guidelines when designing the board? You may send your design to https://www.ti.com/tool/SIMPLELINK-WIFI-DESIGN-REVIEWS to review your product design with the CC3135 TI device.
Note he SOP lines are input pins when booting up, once the device boots up the SOP pins are GPIO and are controlled by the radio. When controlling the RF switch the device will output up to VIO level on SOP0 and SOP1.
Image above taken from CC3135 SimpleLink Wi-Fi® Dual-Band Network Processor Solution for MCU Applications Datasheet (Lit# SWAS037B)
Know that the SOP lines can also be used for factory restore (which is explained in our SimpleLink Wi-Fi® CC3x20, CC3x3x Network Processor User Guide), and Section 4.10 "BLE / 2.4-GHz Radio Coexistence" in the Network Processor User’s Guide (lit SWRU455) explains how to use Coexistence.
BR,
Jessica M. Torres
Greetings,
You may refer to the Country codes and channels listed in Appendix C of the SimpleLink Wi-Fi® CC3x20, CC3x3x Network Processor User Guide.
BR,
Jessica M. Torres
