Texas Instruments | DN009 -- Upgrading from CC1100 to CC1101 (Rev. A) | Application notes | Texas Instruments DN009 -- Upgrading from CC1100 to CC1101 (Rev. A) Application notes

Texas Instruments DN009 -- Upgrading from CC1100 to CC1101 (Rev. A) Application notes
Design Note DN009
Upgrade from CC1100 to CC1101
By Erling Simensen
Keywords
• RF Transceiver
1
• CC1101
• CC1100
Introduction
This document explains the similarities
and differences between the CC1100 and
the CC1101 RF transceivers. The CC1101
is an upgrade of the existing CC1100
transceiver,
and
all
performance
parameters are equal or better on the
CC1101. For most customers the CC1101
can be a drop-in replacement of the
CC1100 transceiver, and this can be
determined by reading the design note.
TI will continue to produce both the
CC1100 and the CC1101 in the future.
Customers using the CC1100 do not need
to change if they do not want to upgrade.
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Design Note DN009
Table of Contents
KEYWORDS.............................................................................................................................. 1
1
INTRODUCTION............................................................................................................. 1
2
ABBREVIATIONS........................................................................................................... 2
3
DIGITAL INTERFACE UPGRADE ................................................................................. 3
3.1
CODE COMPATIBILITY ................................................................................................. 3
3.2
NEW BIT SETTING FOR CLOSE-IN RECEPTION .............................................................. 3
3.3
RETENTION ON ADC DATA RATE SETTINGS ................................................................ 3
3.4
NEW ELECTRONIC REVISION NUMBER......................................................................... 4
4
ANALOG FRONT-END UPGRADE ............................................................................... 4
4.1
RF OUTPUT SPECTRUM ............................................................................................. 4
4.2
FREQUENCY BAND OF OPERATION .............................................................................. 4
5
REFERENCES................................................................................................................ 5
6
GENERAL INFORMATION ............................................................................................ 6
6.1
DOCUMENT HISTORY.................................................................................................. 6
2
Abbreviations
ADC
dB
EM
GFSK
kbps
PCB
Analog to Digital Converter
decibel
Evaluation Module
Gaussian shaped Frequency Shift Keying
kilo bits per second
Printed Circuit Board
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Design Note DN009
3
3.1
Digital Interface Upgrade
Code Compatibility
The digital block is identical on both the CC1100 and the CC1101, so the CC1101 has 100%
code compatibility with the CC1100. All features on the CC1100 also work on the CC1101.
Several customers have already replaced the CC1100 with the CC1101 in their designs
without any issues.
3.2
New Bit Setting for Close-in Reception
The CC1101 includes two previously unused bits which attenuate the incoming signal. This is
useful in scenarios where the RX and TX devices are situated very close and the TX device is
using high output power.
The ability to attenuate an incoming signal is controlled by bit 4 and bit 5 in the FIFOTHR
register. Setting bit 4 to “1” gives 6 dB attenuation of the incoming signal and setting bit 5
gives 12 dB attenuation. Setting both gives 18 dB attenuation. See summary in Table 1.
Description
FIFOTHR.CLOSE_IN_RX[1]
FIFOTHR.CLOSE_IN_RX[0]
No attenuation (same as CC1100)
0
0
6 dB Attenuation
0
1
12 dB Attenuation
1
0
18 dB Attenuation
1
1
Table 1. FIFOTHR.CLOSE_IN_RX Settings
Bits 5:4 of the FIFOTHR register are marked as “reserved” in the CC1100 data sheet and the
meaning of these bits have now been changed for the CC1101 as described.
Example:
Without attenuation: register FIFOTHR = 0x07 (default setting from SmartRF Studio)
With 18 dB attenuation: register FIFOTHR = 0x37
For more information, please see the CC1101 data sheet [1] and DN010 Close-in Reception
with CC1101 [2].
3.3
Retention on ADC Data Rate Settings
The CC1101 can wake up with the ADC configured for optimal sensitivity at low data rates
without writing to any registers upon wakeup. With the CC1100, the TEST registers had to be
written after wakeup in order to accomplish this.
By setting bit 6 of the FIFOTHR register, the CC1101 wakes up with optimum settings for low
data rate (≤ 100 kbps). Further writing to the TEST registers should be avoided because the
chip configures these registers automatically.
Description
FIFOTHR.ADC_RETENTION
CC1101 will wake up with optimal ADC
settings for low data rate (≤ 100 kbps)
1
CC1101 will wake up with optimal ADC
settings for high data rate (> 100kbps)
0
Table 2. FIFOTHR.ADC_RETERNTION Settings
If SmartRF Studio is used to generate register values for CC1101, these settings are
incorporated already.
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Design Note DN009
3.4
New Electronic Revision Number
CC1100 can be replaced by CC1101 without changing register settings. Still it is necessary to
take the version register in account if the firmware checks for this. The chip version is found
in register 0x31 VERSION, and the CC1101 has electronic revision number 0x04, while the
CC1100 has electronic revision number 0x03.
4
4.1
Analog Front-End Upgrade
RF Output Spectrum
The frequency synthesizer of the CC1101 is an optimization of the CC1100 frequency
synthesizer.
Characterization has shown that the output spectrum is the same or better compared to
CC1100 using the same register settings. In general, the phase noise is improved by 4 - 5 dB
on the CC1101 compared to the CC1100.
CC1101 has improved RF performance in the European 863 to 870 frequency band. We
recommend using GFSK modulation for best utilization of the channels in addition to the
latest CC1101EM Reference Design available on the web ([4] and [5]). Old PCB layouts done
for CC1100 will still perform the same or better with the CC1101. Differential load impedance
is the same for CC1100 and CC1101.
4.2
Frequency Band of Operation
CC1101 has expanded the frequency range. In addition to the bands supported by the
CC1100, the CC1101 can operate in the 387 - 400 MHz and 779 - 800 MHz frequency bands.
This gives the frequency coverage shown in Table 3.
Parameter
Min
Max
Unit
Frequency Range
300
348
MHz
387
464
MHz
779
928
MHz
Table 3. Frequency Coverage
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Design Note DN009
5
References
[1]
CC1101 Single-Chip Low Cost Low Power RF-Transceiver, Data sheet (cc1101.pdf)
[2]
DN010 Close-in Reception with CC1101 (swra147.pdf)
[3]
SmartRF Studio (swrc046.zip)
[4]
CC1101EM 315 and 433MHz Reference Design (swrr046.zip)
[5]
CC1101EM 868 and 915MHz Reference Design (swrr045.zip)
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Design Note DN009
6
6.1
General Information
Document History
Revision
SWRA145A
Date
2009.07.14
SWRA145
2007.07.16
Description/Changes
Removed logo from header. Cosmetic changes. Added table
numbers and cross references. Added references. Added and
removed keywords
Initial release.
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