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AT86RF231
9.8
9.8.1
9.8.2
Automatic Filter Tuning (FTN)
Overview
The FTN is incorporated to compensate device tolerances for temperature, supply voltage varia-
tions as well as part-to-part variations of the radio transceiver. The filter-tuning result is used to
correct the analog baseband filter transfer function and the PLL loop-filter time constant, refer to
Section 4. “General Circuit Description” on page 10 .
An FTN calibration cycle is initiated automatically when entering the TRX_OFF state from the
SLEEP, RESET or P_ON states.
Although receiver and transmitter are very robust against these variations, it is recommended to
initiate the FTN manually if the radio transceiver does not use the SLEEP state. If necessary, a
calibration cycle is to be initiated in states TRX_OFF, PLL_ON or any receive state. This applies
in particular for the High Data Rate Modes with a much higher sensitivity against BPF transfer
function variations. The recommended calibration interval is 5 min or less.
Register Description
Register 0x18 (FTN_CTRL):
This register controls the operation of the filter tuning network calibration loop.
Bit
7
6
5
4
3
2
1
0
+0x18
FTN_START
Reserved
FTN_CTRL
Read/Write
Reset Value
R/W
0
R/W
1
R/W
0
R/W
1
R/W
1
R/W
0
R/W
0
R/W
0
? Bit 7 - FTN_START
FTN_START = 1 initiates the filter tuning network calibration. When the calibration cycle has fin-
ished after at most 25 μs the register bit is automatically reset to 0.
? Bit [6:0] - Reserved
125
8111C–MCU Wireless–09/09
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