CC2420Z-RTR1 datasheet(66/92 Pages) TI

66 / 92 page

CC2420

SWRS041B

Page 66 of 89

SYNCWORD (0x14) - Sync Word

Bit

Field Name

Reset

R/W

Description

15:0

SYNCWORD[15:0]

0xA70F

R/W

Synchronisation word. The SYNCWORD is processed from the

least significant nibble (F at reset) to the most significant nibble

(A at reset).

SYNCWORD

is used both during modulation (where 0xF’s are

replaced with 0x0’s) and during demodulation (where 0xF’s are

not required for frame synchronisation). In reception an implicit

zero is required before the first symbol required by SYNCWORD.

The reset value is compliant with IEEE 802.15.4.

TXCTRL (0x15) - Transmit Control Register

Bit

Field Name

Reset

R/W

Description

15:14

TXMIXBUF_CUR[1:0]

R/W

TX mixer buffer bias current.

0: 690uA

1: 980uA

2: 1.16mA (nominal)

3: 1.44mA

TX_TURNAROUND

R/W

Sets the wait time after STXON before transmission is started.

0 : 8 symbol periods (128 us)

1 : 12 symbol periods (192 us)

12:11

TXMIX_CAP_ARRAY[1:0]

R/W

Selects varactor array settings in the transmit mixers.

10:9

TXMIX_CURRENT[1:0]

R/W

Transmit mixers current:

0: 1.72 mA

1: 1.88 mA

2: 2.05 mA

3: 2.21 mA

8:6

PA_CURRENT[2:0]

R/W

Current programming of the PA

0: -3 current adjustment

1: -2 current adjustment

2: -1 current adjustment

3: Nominal setting

4: +1 current adjustment

5: +2 current adjustment

6: +3 current adjustment

7: +4 current adjustment

Reserved, write as 1.

4:0

PA_LEVEL[4:0]

R/W

Output PA level. (~0 dBm)

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