SX1232
WIRELESS & SENSING
DATASHEET
Name
(Address)
Default
value
Bits
Mode
Variable Name
Description
RegAfcMsb
(0x1b)
7-0
7-0
7-0
7-0
AfcValue(15:8)
AfcValue(7:0)
FeiValue(15:8)
FeiValue(7:0)
rw
0x00 MSB of the AfcValue, 2’s complement format. Can be used to
overwrite the current AFC value
RegAfcLsb
(0x1c)
rw
rw
rw
0x00 LSB of the AfcValue, 2’s complement format. Can be used to
overwrite the current AFC value
RegFeiMsb
(0x1d)
-
MSB of the measured frequency offset, 2’s complement. Must
be read before RegFeiLsb.
RegFeiLsb
(0x1e)
-
LSB of the measured frequency offset, 2’s complement
Frequency error = FeiValue x Fstep
RegPreambleDete
7
PreambleDetectorOn
rw
0x01 Enables Preamble detector when set to 1. The AGC settings
ct
(0x1f)
*
supersede this bit during the startup / AGC phase.
0 Æ Turned off
1 Æ Turned on
6-5
PreambleDetectorSize
rw
0x01 Number of Preamble bytes to detect to trigger an interrupt
*
00 Æ 1 byte
01 Æ 2 bytes
10 Æ 3 bytes
11 Æ Reserved
4-0
7-0
PreambleDetectorTol
TimeoutRxRssi
rw
rw
0x0A Number or chip errors tolerated over PreambleDetectorSize.
*
4 chips per bit.
RegRxTimeout1
(0x20)
0x00
Timeout interrupt is generated TimeoutRxRssi*16*Tbit after
switching to Rx mode if Rssi interrupt doesn’t occur (i.e.
RssiValue > RssiThreshold)
0x00: TimeoutRxRssi is disabled
RegRxTimeout2
(0x21)
7-0
7-0
TimeoutRxPreamble
TimeoutSignalSync
rw
rw
0x00
0x00
Timeout interrupt is generated TimeoutRxPreamble*16*Tbit
after switching to Rx mode if Preamble interrupt doesn’t occur
0x00: TimeoutRxPreamble is disabled
RegRxTimeout3
(0x22)
Timeout interrupt is generated TimeoutSignalSync*16*Tbit
after the Rx mode is programmed, if SyncAddress doesn’t
occur
0x00: TimeoutSignalSync is disabled
RegRxDelay
(0x23)
7-0
InterPacketRxDelay
rw
0x00 Additional delay befopre an automatic receiver restart is
launched:
Delay = InterPacketRxDelay*4*Tbit
RC Oscillator registers
RegOsc
(0x24)
7-4
3
unused
r
-
unused
RcCalStart
wt
0x00 Triggers the calibration of the RC oscillator when set. Always
reads 0. RC calibration must be triggered in Standby mode.
2-0
ClkOut
rw
0x07
*
Selects CLKOUT frequency:
000 Æ FXOSC
001 Æ FXOSC / 2
010 Æ FXOSC / 4
011 Æ FXOSC / 8
100 Æ FXOSC / 16
101 Æ FXOSC / 32
110 Æ RC (automatically enabled)
111 Æ OFF
Rev 3 - August 2012
Page 72
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SEMTECH [ SEMTECH CORPORATION ]
