Device Connection And Layout Fundamentals; Pcb Layout Guidelines - Texas Instruments SimpleLink CC3220MOD Series Manual

www.ti.com

10.2 Device Connection and Layout Fundamentals

10.2.1 Power Supply Decoupling and Bulk Capacitors
Depending upon routing resistors and battery type, TI recommends adding two 100-µF ceramic capacitors to
help provide the peak current drawn by the CC3220MODx and CC3220MODAx modules.
The module enters a brown-out condition whenever the input voltage dips below V
8-4 and Figure 8-5). This condition must be considered during design of the power supply routing
specifically if operating from a battery. For more details on brown-out consideration, see
10.2.2 Reset
The module features an internal RC circuit to reset the device during power ON. The nRESET pin must be held
below 0.6 V for at least 5 ms for the device to successfully reset.
10.2.3 Unused Pins
All unused pins can be left unconnected without any concern to leakage current.

10.3 PCB Layout Guidelines

This section details the PCB guidelines to speed up the PCB design using the CC3220MODx and
CC3220MODAx modules. The integrator of the CC3220MODx and CC3220MODAx modules must comply with
the PCB layout recommendations described in the following subsections to minimize the risk with regulatory
certifications for the FCC, IC, CE, MIC, and SRRC. Moreover, TI recommends customers follow the guidelines
described in this section to achieve similar performance to that obtained with the TI reference design.
10.3.1 General Layout Recommendations
Ensure that the following general layout recommendations are followed:
• Have a solid ground plane and ground vias under the module for stable system and thermal dissipation.
• Do not run signal traces underneath the module on a layer where the module is mounted.
10.3.2 CC3220MODx RF Layout Recommendations
The RF section of this wireless module gets top priority in terms of layout. It is very important for the RF section
to be laid out correctly to ensure optimum performance from the module. A poor layout can cause low-output
power, EVM degradation, sensitivity degradation, and mask violations.
Copyright © 2021 Texas Instruments Incorporated
Note
Product Folder Links: CC3220MOD CC3220MODA
CC3220MOD, CC3220MODA
SWRS206E – MARCH 2017 – REVISED MAY 2021
(see
BROWN
Section
Submit Document Feedback
Figure
8.7.
67