CC1110-RTR1 datasheet(165/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 165 of 202

demodulator. This option is enabled by setting

MDMCFG2.MANCHESTER_EN=1.

Manchester

encoding is not supported at the same time as

using the FEC/Interleaver option. Manchester

coding can be used with the 2-ary modulation

formats (2-FSK, GFSK, OOK and MSK).

15.9.1 Frequency Shift Keying

2-FSK can optionally be shaped by a

Gaussian filter with BT=1, producing a GFSK

modulated signal.

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:

DEVIATION

xosc

dev

DEVIATION

)

(

⋅

The symbol encoding is shown in Table 47.

Format

Symbol

Coding

2FSK/GFSK

‘0’

– Deviation

‘1’

+ Deviation

Table 47: Symbol encoding for FSK

modulation

15.9.2 Minimum Shift Keying

When using MSK

2, the complete transmission

(preamble, sync word and payload) will be

MSK modulated.

Phase shifts are performed with a constant

transition time. This means that the rate of

change for the 180-degree transition is twice

that of the 90-degree transition.

The fraction of a symbol period used to

change the phase can be modified with the

DEVIATN.DEVIATION_M

setting.

This

equivalent to changing the shaping of the

symbol. Setting DEVIATN.DEVIATION_M=7

will generate a standard shaped MSK signal.

The MSK modulation format implemented in

CC1110

inverts the sync word and data

compared to e.g. signal generators.

Identical to offset QPSK with half-sine

shaping (data coding may differ)

15.9.3 Amplitude Modulation

CC1110 supports two different forms of

amplitude modulation: On-Off Keying (OOK)

and Amplitude Shift Keying (ASK). OOK

modulation simply turns on or off the PA to

modulate 1 and 0 respectively. When using

ASK the modulation depth (the difference

between 1 and 0) can be programmed, and

the power ramping will be shaped. This will

produce a more bandwidth constrained output

spectrum. Output power is limited to 0 dBm

when ASK is used.

15.10 Received Signal Qualifiers and Link

Quality Information

CC1110 has several qualifier values that are

used to increase the requirements that must

be fulfilled before a search for a valid sync

word is started.

15.10.1 Preamble Quality Threshold (PQT)

The Preamble Quality Threshold (PQT) sync-

word qualifier adds the requirement that the

received sync word must be preceded with a

preamble

with

quality

above

the

programmed threshold.

Another use of the preamble quality threshold

is as a qualifier for the optional RX termination

timer. See section 15.12.3 on page 169 for

details.

The preamble quality estimator increases an

internal counter by one each time a bit is

received that is different from the previous bit,

and decreases the counter by 4 each time a bit

is received that is the same as the last bit. The

counter saturates at 0 and 31. The threshold is

configured

with

the

field

PKTCTRL1.PQT. A threshold of 4·PQT for this

counter is used to gate sync word detection.

By setting the value to zero, the preamble

quality qualifier of the synch word is disabled.

A “Preamble Quality reached” flag can also be

observed

the

status

bit

PKTSTATUS.PQT_REACHED. This flag asserts

when the received signal exceeds the PQT.

15.10.2 RSSI

The RSSI value is an estimate of the signal

level in the current channel. This value is

based on the current gain setting in the RX

chain and the measured signal level in the

channel.

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