CC1070-RTY1 datasheet(45/57 Pages) TI

45 / 57 page

CC1070

SWRS043

Page 45 of 58

MODEM Register (0Dh)

NAME

Default

value

Active

Description

MODEM[7]

Reserved, write 0 (spare register)

MODEM[6:4]

reserved

MODEM[3]

Reserved, write 0 (spare register)

MODEM[2]

PN9_ENABLE

Enable scrambling with PN9 pseudo-random bit

sequence

0: PN9 scrambling is disabled

1: PN9 scrambling is enabled (x

9+x5+1)

MODEM[1:0]

DATA_FORMAT[1:0]

Modem data format

0 (00): NRZ operation

1 (01): Manchester operation

2 (10): Transparent asynchronous UART operation, set

DCLK=0

3 (11): Transparent asynchronous UART operation, set

DCLK=1

DEVIATION Register (0Eh)

NAME

Default

value

Active

Description

DEVIATION[7]

TX_SHAPING

Enable Gaussian shaping of transmitted data

Recommended setting: TX_SHAPING=1

DEVIATION[6:4]

TXDEV_X[2:0]

Transmit frequency deviation exponent

DEVIATION [3:0]

TXDEV_M[3:0]

Transmit frequency deviation mantissa

Deviation in 402-470 MHz band:

FREF ·TXDEV_M ·2

(TXDEV_X−16)

Deviation in 804-940 MHz band:

FREF ·TXDEV_M ·2

(TXDEV_X−15)

On-off-keying (OOK) is used in RX/TX if TXDEV_M[3:0]=0

To find TXDEV_M given the deviation and TXDEV_X:

TXDEV_M = deviation·2

(16−TXDEV_X)/FREF

in 402-470 MHz band.

TXDEV_M = deviation·2

(15−TXDEV_X)/FREF

in 804-940 MHz band.

Decrease TXDEV_X and try again if TXDEV_M

<8.

Increase TXDEV_X and try again if TXDEV_M

≥16.

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