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SX1223
Figure 8: Read sequence of configuration register.
5.2 CONFIGURATION AND STATUS REGISTERS
The SX1223 has several operating modes and configuration parameters which can be programmed by the user.
These modes and parameters are stored in a set of internal configuration registers that can be accessed by the
microcontroller through the 3-wire serial interface.
The detailed contents of the configuration registers are given in the next table. The value attached to each
parameter is the default value at power-up. All the undefined bits in the table below should be kept to 0.
Address
Default Value
Data
A[6:0]
D[7:0] Hex
D7
D6
D5
D4
D3
D2
D1
D0
0000000
0x3F
-
Mode [1:0]
PA [2:0]
ClkOut_en
Sync_en
0000001
0x7D
Modulation [1:0]
Freq_Band
XCOcap_en
LDO_en
OL_opamp_
en
PA_LDc_en
LD_en
0000010
0x02
-
-
PAC_en
XCO_Quick_
Start
XCO_High_
Current
CP_HI
VCO_freq [1:0]
0000011
0x4B
Mod_I [4:0]
Mod_A [2:0]
0000100
0000101
0000110
0x0C
0x1A
0x02
-
-
-
-
-
-
BRn [2:0]
RefClk_K [5:0]
A0 [5:0]
Mod_F [2:0]
0000111
0x00
-
-
-
-
N0 [11.8]
0001000
0x76
N0 [7:0]
0001001
0x00
-
-
-
-
M0 [11:8]
0001010
0x22
M0 [7:0]
0001011
0x02
-
-
A1 [5:0]
0001100
0x00
-
-
-
-
N1 [11:8]
0001101
0x76
N1 [7:0]
0001110
0x00
-
-
-
-
M1 [11:8]
0001111
0x22
M1 [7:0]
0010000
0x20
VCO_IB [2:0]
Prescal_s VCO_by
-
-
-
0010001
0xDD
PA_IB [3:0]
PAB_IB [3:0]
Table 7 : Contents of the configuration registers and their values at power-on
5.2.1 Operating Modes
The SX1223 can be programmed into four different modes by the Mode1 and Mode0 bits, as illustrated in Table 8.
Add Bits
0 6-5
Mode1
0
0
1
1
Mode0
0
1
0
1
Mode
Sleep mode
Standby mode
Synthesizer mode
Transmit mode
Description
All blocks off, Register configuration kept (default)
Crystal oscillator enabled
Crystal oscillator, Frequency synthesizer enabled
Crystal oscillator, Frequency synthesizer, PA enabled
Table 8: SX1223 Operating Modes
? Semtech 2007
16
www.semtech.com
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