Texas Instruments CC110 Series Leitfaden

Design Note

DN022

SWRA215E Page 1 of 8

CC110x/CC111x OOK/ASK Register Settings

By Sverre Hellan

Keywords

OOK

ASK

PER (Packet Error Rate)

CC1100

CC1100E

CC1101

CC1110

CC1111

CC430

1 Introduction

This design note provides guidelines for

finding optimum register settings for

OOK/ASK operation. The starting point for

the optimization is the preferred settings

given by the SmartRF®Studio SW. The

user needs to measure the sensitivity

(PER) over the full input dynamic range to

determine the optimum settings.

This design note uses CC1101 as an

example on how to find optimum register

settings, but it is also applicable for

CC1100, CC1100E, CC1110, CC1111,

and CC430.

Design Note

DN022

SWRA215E Page 2 of 8

Table of Contents

KEYWORDS.............................................................................................................................. 1

1INTRODUCTION............................................................................................................. 1

2ABBREVIATIONS........................................................................................................... 2

3OOK/ASK REGISTER SETTINGS ................................................................................. 3

3.1 AGC SETTINGS ......................................................................................................... 3

3.2 IF FREQUENCY .......................................................................................................... 4

3.3 PROCEDURE FOR FINDING OOK/ASK SETTINGS USING SMARTRF®STUDIO................. 5

4GENERAL INFORMATION............................................................................................. 8

4.1 DOCUMENT HISTORY ................................................................................................. 8

2 Abbreviations

AGC Automatic Gain Control

ASK Amplitude Shift Keying

EM Evaluation Module

2-FSK Frequency Shift Keying

GFSK Gaussian shaped Frequency Shift Keying

IF Intermediate Frequency

MSK Minimum Shift Keying

OOK On-Off Keying

PER Packet Error Rate

SW Software

Design Note

DN022

SWRA215E Page 3 of 8

3 OOK/ASK Register Settings

3.1 AGC Settings

The register settings provided by SmartRF®Studio have been optimized for 2-

FSK/GFSK/MSK modulation and when using one of the preferred settings and only changing

the modulation format to OOK/ASK, the AGC settings might result in unstable or non-optimum

reception (i.e. degraded sensitivity). This is pictured in Figure 1.

100

120

-120

-115

-110

-105

-100

-95

-90

-85

-80

-75

-70

-65

-60

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

Input power level [dBm]

PER [%]

non-optimum

optimum

unstable

Figure 1. Example of Unstable, Non-Optimum, and Optimum Reception

The optimum AGC settings change with RX filter bandwidth and data rate, but for OOK/ASK

the following has been found to give good results:

AGCCTRL2 = 0x03 to 0x07

AGCCTRL1 = 0x00

AGCCTRL0 = 0x91 or 0x92

In the example shown in Figure 2, the best sensitivity is achieved with AGCCTRL2 = 0x04,

AGCCTRL1 = 0x00, and AGCCTRL0 = 0x92. Please note that optimum register settings

change with data rate so it is important to measure sensitivity for different combinations of

AGCCTRL2 and AGCCTRL0. Furthermore, as shown in Figure 1, some combinations of AGC

settings results in unstable reception. That is, for some input power levels above the sensitivity

limit there will be degraded packet error rate (PER). It is therefore important to check the PER

for the entire dynamic range and not only at the sensitivity limit. One option is to check the

PER for every 2 dB increase in input power level.

AGCCTRL2.MAGN_TARGET[2:0] is used to set an on-chip target value for the peak signal

amplitude. MAGN_TARGET is used by the AGC loop to set the correct gain.

AGCCTRL0.FILTER_LENGTH[1:0] is used to configure the ASK decision boundary. If the

ASK decision boundary is set to 8 dB, the “low” bit must be at least 16 dB below the “high” bit.

Design Note

DN022

SWRA215E Page 4 of 8

100

120

-120

-114

-108

-102

-96

-90

-84

-78

-72

-66

-60

-54

-48

-42

-36

-30

-24

-18

-12

Input power level [dBm]

PER [%]

07 00 92

06 00 92

05 00 92

04 00 92

03 00 92

Figure 2. PER versus Input Power Level for Different AGC Register Settings (3.8 kBaud,

100 kHz RX Filter Bandwidth)

3.2 IF Frequency

filter bandwidths. It is therefore recommended to find the FSCTRL1 setting using one of the

preferred RX filter bandwidth settings in SmartRF®Studio (see Figure 3). If the wanted RX

filter bandwidth is not given by one of the preferred settings, choose the FSCTRL1 setting for

the first RX filter bandwidth that is wider than the wanted RX filter bandwidth.

As an example, for a wanted 150 kHz RX filter bandwidth use the FSCTRL1 setting given for

232 kHz RX filter bandwidth.

RX filter bandwidths

used by preferred settings:

58 kHz, 100 kHz, 232 kHz,

325 kHz, 540 kHz, 812 kHz

RX filter bandwidths

used by preferred settings:

58 kHz, 100 kHz, 232 kHz,

325 kHz, 540 kHz, 812 kHz

Figure 3. Available RX Filter Bandwidths Given by the Preferred Settings in SmartRF®

Studio

Design Note

DN022

SWRA215E Page 5 of 8

Note that the FREND1, FIFOTHR, TEST2, and TEST1 register settings change for different

RX filter bandwidths.

FREND1:

RX filter bandwidth > 101 kHz, FREND1 = 0xB6

RX filter bandwidth ≤101 kHz, FREND1 = 0x56

TEST2:

RX filter bandwidth > 325 kHz, TEST2 = 0x88

RX filter bandwidth ≤325 kHz, TEST2 = 0x81

TEST1:

RX filter bandwidth > 325 kHz, TEST1 = 0x31

RX filter bandwidth ≤325 kHz, TEST1 = 0x35

FIFOTHR:

RX filter bandwidth > 325 kHz, FIFOTHR = 0x07

RX filter bandwidth ≤325 kHz, FIFOTHR = 0x47

3.3 Procedure for Finding OOK/ASK Settings using SmartRF®Studio

As an example, assume 4.8 kBaud data rate and 203 kHz RX filter bandwidth.

1) Use SmartRF®Studio to find the optimum IF frequency. Select the preferred setting that

has an RX filter bandwidth equal to the wanted bandwidth. If the wanted RX filter bandwidth is

not given by one of the preferred settings, chose the first RX filter bandwidth that is wider than

the wanted bandwidth. For a 203 kHz wanted RX filter bandwidth, select the 232 kHz RX filter

bandwidth for optimum IF frequency.

Design Note

DN022

SWRA215E Page 6 of 8

2) Change the data rate and the RX filter bandwidth to the wanted values. Change the

modulation format to ASK/OOK. Press “Reset CC1101 and write settings” (if SmartRF®Studio

is being used to control a CC1101EM) and then “Copy settings to Register View”

Design Note

DN022

SWRA215E Page 7 of 8

3) In Register View, change the AGCCTRL2, AGCCTRL1, and AGCCTRL0 settings as

explained in Section 3.1. Make sure the FSCTRL1, FIFOTHR, FREND1, TEST2, and TEST1

registers are set as explained in Section 3.2. It is possible to print the register settings to a file

using “Export CC1101 Registers” under “File”. Press the “Write” button for the register to be

updated if SmartRF®Studio is being used to control a CC1101EM.

Design Note

DN022

SWRA215E Page 8 of 8

4) If SmartRF®Studio is being used to perform the test, go back to Normal View. Check the

Manual Init box for the changes done in Register View to take effect.

4 General Information

4.1 Document History

Revision

Date

Description/Changes

SWRA215E

2012-03-08

Changed document name from “CC11xx OOK/ASK Register

Settings” to “CC110x/CC111x OOK/ASK Register Settings”

SWRA215D

2012-02-10

Corrected error in RX BW on page 5

SWRA215C

2012-02-09

Added FIFOTHR to the list of registers on page 5

SWRA215B

2009-11-11

Added CC430 to list of devices

SWRA215A

2009-03-15

Added CC1100E. Added info about TEST2, TEST1, and FREND1

SWRA215

2008-06-09

Initial release

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