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This application report describes a preamble quality-based antenna-diversity patch for the CC13xx
SimpleLink™ Sub-1 GHz ultra-low power wireless microcontroller (MCU).
Recommended register settings discussed in this application report can be downloaded from
http://www.ti.com/lit/zip/SWRA523.
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Trademarks
SimpleLink, SmartRF are trademarks of Texas Instruments.
ARM, Cortex are registered trademarks of ARM Limited (or its subsidiaries).
All other trademarks are the property of their respective owners.
SWRA523B - September 2016 - Revised March 2017
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ABSTRACT
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List of Figures
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Copyright © 2016-2017, Texas Instruments Incorporated
SWRA523B - September 2016 - Revised March 2017
CC13xx Antenna Diversity
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CC13xx Antenna Diversity
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Table of Contents
Related Manuals for Texas Instruments CC13 Series
Summary of Contents for Texas Instruments CC13 Series
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Page 1: Table Of Contents
Test 4 PER for Boards Using ANT1, ANT2, or Diversity (DIV) Trademarks SimpleLink, SmartRF are trademarks of Texas Instruments. ARM, Cortex are registered trademarks of ARM Limited (or its subsidiaries). All other trademarks are the property of their respective owners. -
Page 2: Introduction
TX state. This condition ensures that an acknowledgment is sent with the same antenna that received the last packet. CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 3: Antenna Diversity Flow Chart
PQT2 Measure RSSI2 Toggle the switch Toggle the switch RSSI2 > RSSI? Sync Search Figure 1. Antenna Diversity Flow Chart SWRA523B – September 2016 – Revised March 2017 CC13xx Antenna Diversity Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 4: Register Overrides To Be Removed From Smartrf™ Studio Code Export
Run the MCE and RFE patches contains a smartrf_settings.c file that has the complete override list to be used with the patch. CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 5: Configuration Registers
The registers can be read using the CMD_READ_RFREG API command but can be written only as an override (when doing a CMD_PROP_RADIO_DIV_SETUP). SWRA523B – September 2016 – Revised March 2017 CC13xx Antenna Diversity Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 6: Building A Software Example
4. Add the following line or lines to the int main(void) function before starting the BIOS. Adding these lines is to connect the RFC_SMI_CL_OUT signal to wanted DIOs (ANTENNA_SELECT and ANTENNA_SELECT_INV). PINCC26XX_setMux(pinHandle, PIN_ID(ANTENNA_SELECT), PINCC26XX_MUX_RFC_SMI_CL_OUT); PINCC26XX_setMux(pinHandle, PIN_ID(ANTENNA_SELECT_INV), PINCC26XX_MUX_RFC_SMI_CL_OUT); CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 7: Smartrf™ Studio Setup For Tx
For the transmitter, use the SmartRF Studio and the 50-kbps setting with the preamble count set to 6 bytes (see Figure Figure 2. SmartRF™ Studio Setup for TX SWRA523B – September 2016 – Revised March 2017 CC13xx Antenna Diversity Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 8: Measurement Results
-105 Input Power Level (dBm) D001 Figure 3. PER vs Input Power Level (6-Byte Preamble, 6-dB Attenuator on One Antenna) CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 9: Per Vs Input Power Level (8-Byte Preamble, 6-Db Attenuator On One Antenna)
−100 −110 −50 Offset Frequency (ppm) Figure 5. PER vs Input Power Level (6-Byte Preamble, 6-dB Attenuator on One Antenna) SWRA523B – September 2016 – Revised March 2017 CC13xx Antenna Diversity Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 10: Per Vs Input Power Level (8-Byte Preamble, 6-Db Attenuator On One Antenna)
−100 −110 −50 Offset Frequency (ppm) Figure 6. PER vs Input Power Level (8-Byte Preamble, 6-dB Attenuator on One Antenna) CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 11: Block Diagram Of Antenna Diversity Test Setup
Control signals for the switch are made available on two of the CC1310 DIOs and are used to select the appropriate antenna through the switch. SWRA523B – September 2016 – Revised March 2017 CC13xx Antenna Diversity Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 12: Antenna Diversity Test Board
(AntSelect0Cnt and AntSelect1Cnt would include antenna selection in cases where packets were discarded due to CRC errors). CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 13: Test 1 Per For Boards Using Ant1, Ant2, Or Diversity (Div)
The board using antenna diversity (DIV) and the board connected to ANT2 yielded the same PER. The CC1310EM connected to ANT1 yielded a significantly higher PER. SWRA523B – September 2016 – Revised March 2017 CC13xx Antenna Diversity Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 14: Test 3 Per For Boards Using Ant1, Ant2, Or Diversity (Div)
2403 3000 19.9 The board using antenna diversity (DIV) yielded a lower PER than the single-antenna boards (ANT1 and ANT2). CC13xx Antenna Diversity SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated... -
Page 15: References
References www.ti.com References 1. Texas Instruments, CC13xxEM-7793_4L, Reference Design 2. Texas Instruments, SmartRF Studio 7 3. Texas Instruments, SimpleLink™ CC13x0 Software Development Kit 4. Texas Instruments, SWRA523 (.zip file with recommended settings and overrides) SWRA523B – September 2016 – Revised March 2017... - Page 16 Deleted patch storage information from Section 3 Changes from September 2, 2016 to December 23, 2016 ....................Page ........................• Changed Section 5 Revision History SWRA523B – September 2016 – Revised March 2017 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated...
- Page 17 IMPORTANT NOTICE FOR TI DESIGN INFORMATION AND RESOURCES Texas Instruments Incorporated (‘TI”) technical, application or other design advice, services or information, including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to assist designers who are developing applications that incorporate TI products;...