CC2420 Chipcon AS, CC2420 Datasheet - Page 64

• Manufacturer Part Number: CC2420
• Description: 2.4 GHz RF Transceiver for IEEE 802.15.4 and ZigBee
• Manufacturer: Chipcon AS

SYNCWORD (0x14) - Sync Word
15:0
TXCTRL (0x15) - Transmit Control Register
15:14
13
12:11
10:9
8:6
5
4:0
Chipcon AS SmartRF ® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Bit
Bit
Field Name
SYNCWORD[15:0]
Field Name
TXMIXBUF_CUR[1:0]
TX_TURNAROUND
TXMIX_CAP_ARRAY[1:0]
TXMIX_CURRENT[1:0]
PA_CURRENT[2:0]
PA_DIFF
PA_LEVEL[4:0]
Reset
0xA70F
Reset
1
1
0
0
3
1
31
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SmartRF
Description
TX mixer buffer bias current.
0: 690uA
1: 980uA (nominal)
2: 1.16mA
3: 1.44mA
Sets the wait time after STXON before transmission is started.
0 : 8 symbol periods (128 us)
1 : 12 symbol periods (192 us)
Selects varactor array settings in the transmit mixers.
Transmit mixers current:
0: 1.72 mA
1: 1.88 mA
2: 2.05 mA
3: 2.21 mA
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
Indicates whether PA output is differential (1) or single-ended
(0).
Output PA level. (~0 dBm)
Description
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.
®
CC2420
Page 64 of 85