CC1110-RTR1 datasheet(162/203 Pages) TI

162 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 162 of 202

Bit

Field name

Description

7:0

RSSI

RSSI value

Table 45: Received packet status byte 1

(first byte appended after the data)

Bit

Field name

Description

CRC_OK

1: CRC for received data OK (or

CRC disabled)

0: CRC error in received data

6:0

LQI

The

Link

Quality

Indicator

estimates how easily a received

signal can be demodulated

Table 46: Received packet status byte 2

(second byte appended after the data)

Note that register fields that control the

packet handling features should only be

altered when

CC1110 is in the IDLE state.

15.8.1 Data whitening

From a radio perspective, the ideal over

the air data are random and DC free. This

results in the smoothest power distribution

over the occupied bandwidth. This also

gives the control loops in the receiver

uniform operation conditions (no data

dependencies).

Real world data often contain long

sequences

zeros

and

ones.

Performance can then be improved by

whitening the data before transmitting, and

de-whitening in the receiver. With

CC1110,

this can be done automatically by setting

PKTCTRL0.WHITE_DATA=1.

All

data,

except the preamble and the sync word,

are then XOR-ed with a 9-bit pseudo-

random (PN9) sequence before being

transmitted. At the receiver end, the data

are XOR-ed with the same pseudo-

random sequence. This way, the whitening

is reversed, and the original data appear in

the receiver.

Setting

PKTCTRL0.WHITE_DATA=1

recommended for all uses, except when

over-the-air

compatibility

with

other

systems is needed.

15.8.2 Packet format

The format of the data packet can be

configured and consists of the following

items:

•

Preamble

•

Synchronization word

•

Length

byte

constant

programmable packet length

•

Optional Address byte

•

Payload

•

Optional 2 byte CRC

The preamble pattern is an alternating

sequence

ones

and

zeros

(01010101…). The minimum length of the

preamble

programmable.

When

enabling TX, the modulator will start

transmitting the preamble. When the

programmed number of preamble bytes

has been transmitted, the modulator will

send the sync word and then data from the

RFD register.

The

number

preamble

bytes

programmed

with

the

MDMCFG1.NUM_PREAMBLE value.

The synchronization word is a two-byte

value set in the SYNC1 and SYNC0

registers. The sync word provides byte

synchronization of the incoming packet. A

one-byte sync word can be emulated by

setting the SYNC1 value to the preamble

pattern. It is also possible to emulate a 32

bit

sync

word

using

CC1110-RTR1 데이터시트(PDF) 162 Page - Texas Instruments

CC1110-RTR1 데이터시트(HTML) 162 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL