SX1223 데이터 시트보기 (PDF) - Semtech Corporation
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SX1223 Datasheet PDF : 25 Pages
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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
A[6:0]
0000000
0000001
0000010
0000011
0000100
0000101
0000110
0000111
0001000
0001001
0001010
0001011
0001100
0001101
0001110
0001111
0010000
0010001
Default Value
D[7:0] Hex
0x3F
0x7D
0x02
0x4B
0x0C
0x1A
0x02
0x00
0x76
0x00
0x22
0x02
0x00
0x76
0x00
0x22
0x20
0xDD
D7
D6
D5
-
Mode [1:0]
Modulation [1:0]
Freq_Band
-
-
PAC_en
Mod_I [4:0]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
VCO_IB [2:0]
PA_IB [3:0]
Data
D4
D3
D2
D1
D0
PA [2:0]
ClkOut_en
Sync_en
XCOcap_en
LDO_en
OL_opamp_
en
PA_LDc_en
LD_en
XCO_Quick_
Start
XCO_High_
Current
CP_HI
VCO_freq [1:0]
Mod_A [2:0]
BRn [2:0]
Mod_F [2:0]
RefClk_K [5:0]
A0 [5:0]
-
N0 [11.8]
N0 [7:0]
-
M0 [11:8]
M0 [7:0]
A1 [5:0]
-
N1 [11:8]
N1 [7:0]
-
M1 [11:8]
M1 [7:0]
Prescal_s
VCO_by
-
-
-
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
www.semtech.com
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