CC3120MOD Datasheet, PDF (35/52 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Network Processor Internet-of-Things Module Solution for MCU Applications

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CC3120MOD
SWRS205 – MARCH 2017
7.1.2 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 CC3120MOD module.
NOTE
The module enters a brown-out condition whenever the input voltage dips below V_BROWN (see
Figure 5-4 and Figure 5-5). 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 Section 5.7.
7.1.3 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.
7.1.4 Unused Pins
All unused pins can be left unconnected without any concern to leakage current.
7.2 PCB Layout Guidelines
This section details the PCB guidelines to speed up the PCB design using the CC3120MOD Module.
Follow these guidelines to ensure that the design minimizes the risk with regulatory certifications including
FCC, IC, CE, TELEC, and China.
7.2.1 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.
• RF traces must have 50-Ω impedance.
• RF trace bends must be made with gradual curves, and 90 degree bends must be avoided.
• RF traces must not have sharp corners.
• There must be no traces or ground under the antenna section.
• RF traces must have via stitching on the ground plane beside the RF trace on both sides.
• RF traces must be as short as possible. The antenna, RF traces, and the module must be on the edge
of the PCB product in consideration of the product enclosure material and proximity.
Copyright © 2017, Texas Instruments Incorporated
Applications, Implementation, and Layout
35
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