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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
Table 12 SX1230 SPI Register Description
DATASHEET
Addr.
0x00
Register Name
Mode
Default
0x10
Bits
7
Variable Name
-
Mode
rw
unused
Description
6:4
mode(2:0)
rw
Operating mode:
000 sleep mode (SLEEP)
001 stand-by mode (STDBY)
010 frequency synthesizer mode (FS)
011 transmit mode (TX)
others reserved
Read value is always chip actual mode
3:2
modul_type(1:0)
rw
Modulation type:
00 FSK
01 OOK
Others reserved
1:0
data_shaping(1:0)
rw
Data shaping:
In FSK:
00 no shaping
01 Gaussian filter with BT = 1.0
10 Gaussian filter with BT = 0.5
11 Gaussian filter with BT = 0.3
In OOK:
00 no shaping
01 filtering with fcutoff = bit rate
10 filtering with fcutoff = 2 * bit rate
(BR <= 32 kb/s)
11 reserved
0x01
0x02
BrMsb
BrLsb
0x1A
0x0B
7:0
7:0
br_ratio(15:8)
br_ratio(7:0)
rw
rw
Bit rate MSB (chip rate if Manchester encoding)
Bit rate LSB (chip rate if Manchester encoding)
R B = ---------------------------------
f XOSC
br_ratio(15:0)
Default value is 0x1A0B = 4.8 kbps
0x03
FdevMsb
0x00
7:6
-
-
unused
5:0
fdev_coeff(13:8)
rw
Deviation frequency MSB
0x04
FdevLsb
0x52
7:0
fdev_coeff(7:0)
rw
Deviation Frequency LSB
f XOSC ? df_coeff(13:0)
Δ f = ------------------------------------------------------
2
19
Default = 0x0052 = 82, gives 5 kHz
0x05
0x06
FrfMsb
FrfMid
0xE4
0xC0
7:0
7:0
freq_rf(23:16)
freq_rf(15:8)
rw
rw
RF carrier frequency MSB
RF carrier centre bits
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 22
www.semtech.com
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