CC1021-RTR1 datasheet(66/91 Pages) TI1

66 / 91 page

Not Recommended for New Designs NRND

CC1021

SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

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Table 5-31. MODEM Register (0Dh)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

MODEM[7]

—

Reserved, write 0

MODEM[6:4]

ADC_DIV[2:0]

—

ADC clock divisor(1)

0: Not supported

1: ADC frequency = XOSC frequency / 4

2: ADC frequency = XOSC frequency / 6

3: ADC frequency = XOSC frequency / 8

4: ADC frequency = XOSC frequency / 10

5: ADC frequency = XOSC frequency / 12

6: ADC frequency = XOSC frequency / 14

7: ADC frequency = XOSC frequency / 16

MODEM[3]

—

Reserved, write 0

MODEM[2]

PN9_ENABLE

Enable scrambling of TX and RX with PN9 pseudo-random bit

sequence

0: PN9 scrambling is disabled

1: PN9 scrambling is enabled (x9 + x5 + 1)

The PN9 pseudo-random bit sequence can be used for BER testing by

only transmitting zeros, and then counting the number of received

ones.

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

(1)

The intermediate frequency should be as close to 307.2 kHz as possible. ADC clock frequency is always 4 times the intermediate

frequency and should therefore be as close to 1.2288 MHz as possible.

Table 5-32. DEVIATION Register (0Eh)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

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 to 470 MHz band:

FREF × XDEV_M × 2

(TXDEV_X

−16)

Deviation in 804 to 960 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 to 470 MHz band,

TXDEV_M = deviation × 2(15−TXDEV_X) / FREF

in 804 to 960 MHz band,

Decrease TXDEV_X and try again if TXDEV_M < 8.

Increase TXDEV_X and try again if TXDEV_M

≥ 16.

Detailed Description

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