CC115LRGP datasheet(26/74 Pages) TI2

26 / 74 page

+1/3

-1/3

-1

00 01 01 11 10 00 11 01

Preamble

0xAA

Sync

0xD3

Data

0x17 0x8D

1/Baud Rate

DEVIATION _ E

XOSC

dev

(8 DEVIATION _ M) 2

CC115L

SWRS105B – MAY 2011 – REVISED JUNE 2014

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5.9

Modulation Formats

CC115L supports amplitude, frequency, and phase shift modulation formats. The desired modulation

format is set in the MDMCFG2.MOD_FORMAT register.

Optionally,

the

data

stream

can

Manchester

coded

the

modulator

setting

MDMCFG2.MANCHESTER_EN=1.

NOTE

Manchester encoding is not supported at the same time as using 4-FSK modulation.

5.9.1

Frequency Shift Keying

CC115L supports 2-(G)FSK and 4-FSK modulation. When selecting 4-FSK, the preamble and sync word

is sent using 2-FSK (see Figure 5-8).

The frequency deviation is programmed with the DEVIATION_M and DEVIATION_E values in the

DEVIATN register. The value has an exponent/mantissa form, and the resultant deviation is given by:

(4)

The symbol encoding is shown in Table 5-4.

Table 5-4. Symbol Encoding for 2-FSK/GFSK and 4-FSK Modulation

Format

Symbol

Coding

– Deviation

2-FSK/GFSK

+ Deviation

– Deviation

– 1/3×Deviation

4-FSK

+ 1/3×Deviation

+ Deviation

Figure 5-8. Data Sent Over the Air ( MDMCFG2.MOD_FORMAT=100)

5.9.2

Amplitude Modulation

The amplitude modulation supported by CC115L is On-Off Keying (OOK). OOK modulation simply turns

the PA on or off to modulate ones and zeros respectively.

The DEVIATN register setting has no effect when using OOK.

Detailed Description

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