SX1231 SEMTECH [Semtech Corporation], SX1231 Datasheet - Page 66

• Manufacturer Part Number: SX1231
• Description: Low Power Integrated UHF Transceiver
• Manufacturer: SEMTECH [Semtech Corporation]

Rev 2 - Nov 2009
ADVANCED COMMUNICATIONS & SENSING
RegAfcFei
(0x1E)
RegAfcMsb
(0x1F)
RegAfcLsb
(0x20)
RegFeiMsb
(0x21)
RegFeiLsb
(0x22)
RegRssiConfig
(0x23)
RegRssiValue
(0x24)
7-0
7-0
7-0
7-0
7-4
7-0
7
6
5
4
3
2
1
0
3
2
1
0
-
FeiDone
FeiStart
AfcDone
AfcAutoclearOn
AfcAutoOn
AfcClear
AfcStart
AfcValue(15:8)
AfcValue(7:0)
FeiValue(15:8)
FeiValue(7:0)
-
FastRx
-
RssiDone
RssiStart
RssiValue
rw
rw
rw
rw
rw
w
w
w
w
r
r
r
r
r
r
r
r
r
Page 66
0xFF
0x00
0x00
0000
0
0
0
1
0
0
0
0
0
0
1
0
-
-
unused
0
1
Triggers a FEI measurement when set. Always reads 0.
0
1
Only valid if AfcAutoOn is set
0
1
0
1
Clears the AfcValue when set. Always reads 0
Triggers an AFC when set. Always reads 0.
MSB of the AfcValue, 2’s complement format
LSB of the AfcValue, 2’s complement format
Frequency correction = AfcValue x Fstep
MSB of the measured frequency offset, 2’s complement
LSB of the measured frequency offset, 2’s complement
Frequency error = FeiValue x Fstep
unused
Fast or standard Rx wakeup sequence
0
start the receiver
1
the receiver
unused
0
1
Trigger a RSSI measurement when set. Always reads 0.
Absolute value of the RSSI in dBm, 0.5dB steps.
RSSI = - RssiValue/2 [dBm]
FEI is on-going
FEI finished
AFC is on-going
AFC has finished
AFC register is not cleared before a new AFC phase
AFC register is cleared before a new AFC phase
AFC is performed each time AfcStart is set
AFC is performed each time Rx mode is entered
2 RSSI samples over RssiThreshold are required to
1 RSSI sample over RssiThreshold is enough to start
RSSI is on-going
RSSI sampling is finished, result available
DATASHEET
www.semtech.com
SX1231