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SPIRIT1 Datasheet(PDF) 48 Page - STMicroelectronics

No. de pieza SPIRIT1
Descripción Electrónicos  Low data rate, low power sub-1GHZ transceiver
PDF  94 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPIRIT1 Datasheet(HTML) 48 Page - STMicroelectronics

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Transmission and reception
SPIRIT1
48/94
Doc ID 022758 Rev 3
When reception is aborted on timeout expiration, the packet is considered not valid and will
be discarded.
It is responsibility of the user to choose the proper boolean condition that suit its application.
In particular, it is required to include always SQI valid check, to avoid to stay in RX state for
unlimited time, if timeout is stopped but no valid SQI is detected (in such cases, the RX state
can be left using a SABORT command).
It is also important to notice that, in case a packet is received, that the timeout is stopped by
some of the conditions in order to get an RX data ready interrupt, otherwise SPIRIT1 will
wait in RX mode for the RX timeout to expire anyway.
9.4
Intermediate frequency setting
The intermediate frequency (IF) is controlled by the registers IF_OFFSET_ANA and
IF_OFFSET_DIG, and can be set as:
Equation 7
Equation 8
where fXO is the XTAL oscillator frequency (24, 25, 26, 48, 50 or 52 MHz) and fCLK is the
digital clock frequency (24, 25 or 26 MHz).
01
1
0
Both RSSI AND SQI above
threshold
01
0
1
Both RSSI AND PQI above
threshold
00
1
1
Both SQI AND PQI above
threshold
0
1
1
1
ALL above threshold
11
1
0
RSSI OR SQI above
threshold
11
0
1
RSSI OR PQI above
threshold
10
1
1
SQI OR PQI above
threshold
1
1
1
1
ANY above threshold
Table 26.
RX timeout stop condition configuration (continued)
RX_TIMEOUT_
AND_OR_SELECT
CS_TIMEOUT_MASK
SQI_TIMEOUT
_MASK
PQI_TIMEOUT_M
ASK
Description
IF_OFFSET_ANA
ROUND
f
IF
f
XO
---------
32
12
64
–
⋅⋅
⎝⎠
⎛⎞
⋅
=
IF_OFFSET_DIG
ROUND
f
IF
f
CLK
-----------
32
12
64
–
⋅⋅
⎝⎠
⎛⎞
⋅
=



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