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S2-LPS 数据表(PDF) 23 Page - STMicroelectronics

部件名 S2-LPS
功能描述  Ultra-low power, high performance, sub-1 GHz transceiver
PDF  73 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

S2-LPS 数据表(HTML) 23 Page - STMicroelectronics

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Table 34. Constellation mapping 2-(G)FSK
Format
Symbol
CONST_MAP coding
0
1
2
3
2-(G)FSK
0
-FDEV
NA
+FDEV
NA
1
+FDEV
NA
-FDEV
NA
Table 35. Constellation mapping 4-(G)FSK
Format
Symbol
CONST_MAP coding
0
1
2
3
4-(G)FSK
00
-FDEV/3
-FDEV
+FDEV/3
+FDEV
01
-FDEV
-FDEV/3
+FDEV
+FDEV/3
10
+FDEV/3
+FDEV
-FDEV/3
-FDEV
11
+FDEV
+FDEV/3
-FDEV
-FDEV/3
Furthermore, in the 4-(G)FSK it is also possible to swap the symbols using the 4FSK_SYM_SWAP field (register
PCKTCTRL3) as follows:
(10)
When 4FSK_SYM_SWAP = 0: S0 = <b7b6>
S1 = <b5b4>
S2 = <b3b2>
S3 = <b1b0>
When 4FSK_SYM_SWAP = 1 S0 = <b6b7>
S1 = <b4b5>
S2 = <b2b3>
S3 = <b0b1>
4.4.1.1
Gaussian shaping
In 2-GFSK or 4-GFSK mode, the Gaussian filter BT product can be set by using the register BT_SEL to 1 or 0.5.
The Gaussian filtering is implemented by poly-phase filtering with eight taps per symbol time. In order to further
smooth the filter shape and improve spectral shaping, the output of the filter can be linearly interpolated by setting
the register MOD_INTERP_EN.
A mathematical interpolation factor is applied at each sample of the Gaussian filter output. This factor is 64
for data rates corresponding to DATA_RATE_E < 5, it is automatically scaled as
64
2DATA_RATE_E−5for5≤
DATA_RATE_E < 11 and it is automatically disabled for DATA_RATE_E = 11.
Note:
The actual interpolation factor achieved may be limited by the minimal frequency resolution of the frequency
synthesizer.
4.4.1.2
ISI cancellation 4-(G)FSK
Since the 4-(G)FSK modulation format strongly suffers from the effect of inter symbol interference, an ISI
cancellation equalizer has been introduced in the demodulator. An equalizer can be enabled, by using the
EQU_CTRL register, with two modes: single pass equalization and dual pass equalization. The best performance
is normally achieved using the dual pass equalizer.
4.4.2
Amplitude modulation
Amplitude modulation OOK and ASK are both supported by the S2-LPS. The ASK selection depends on power
ramping enable.
When OOK is selected, a bit '1' is transmitted with a programmed power, set by register
PA_POWER[PA_LEVEL_MAX_INDEX], and a bit '0' is transmitted without output power (PA off) and specified
by the register PA_POWER[0].
S2-LPS
Digital modulator
DS13831 - Rev 1
page 23/73



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