AT86RF232 Atmel Corporation, AT86RF232 Datasheet - Page 122

• Manufacturer Part Number: AT86RF232
• Manufacturer: Atmel Corporation

Specifications of AT86RF232

• Max. Operating Frequency: 0 MHz
• Crypto Engine: AES
• Operating Voltage (vcc): 1.8 to 3.6
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 0.25
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -100
• Receive Current Consumption (ma): 11.8
• Transmit Current Consumption (ma): 13.8
• Link Budget (dbm): 103

9.8 Automatic Filter Tuning (FTN)
9.8.1 Overview
9.8.2 Register Description
122
AT86RF232
Bit
0x18
Read/Write
Reset value
Bit
0x18
Read/Write
Reset value
The Atmel AT86RF232 FTN is incorporated to compensate device tolerances for
temperature, supply voltage variations 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
An FTN calibration cycle is initiated automatically when entering the TRX_OFF state
from the P_ON, SLEEP, or RESET state.
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 RX_ON. The recommended calibration interval is five minutes or less.
Register 0x18 (FTN_CTRL):
The FTN_CTRL register controls the operation of the filter tuning network calibration
loop.
Figure 9-18. Register FTN_CTRL.
 Bit 7 - FTN_START
Manual start of a filter calibration cycle.
Table 9-20. FTN_START.
Register Bits
FTN_START
FTN_START = 1 initiates the filter tuning network calibration. When the calibration cycle
has finished after t
finishing the calibration.
FTN_START
R/W
R/W
7
0
3
1
FTN
= 25µs (typ.). The register bit is cleared immediately after
Value
0
1
R/W
R/W
6
1
2
0
Description
Filter calibration is finished
Initiates filter calibration cycle
reserved
reserved
R/W
R/W
5
0
1
0
Chapter
4.
R/W
R/W
4
1
0
0
8321A–MCU Wireless–10/11
FTN_CTRL
FTN_CTRL