at86rf211 ATMEL Corporation, at86rf211 Datasheet - Page 28

• Manufacturer Part Number: at86rf211
• Description: Fsk Transceiver For Ism Radio Applications
• Manufacturer: ATMEL Corporation

Table 6. CTRL1 Detailed Description
Notes:
28
MOFFSET
MRSSI sequence
XTALFQ
FSKPOL
FSKBW
DSREF
Name
RXFS
DATAMSG
RSSI level
–
–
–
–
1. The same ADC is used to measure RSSI or V
2. V
3. While in V
4. Description of RSSI measurement with hysteresis mechanism: if the RSSI measurement is higher than the high RSSI level,
AT86RF211
stopped (previously measured RSSI is kept into STATUS Register). This can disturb the reception process (if a threshold is
used for DATAMSG validation). So, it is not recommended to measure V
DATAMSG is validated (high RSSI level = TRSSI + HRSSI). If the RSSI measure is lower than the low RSSI level, DATA-
MSG is inhibited (low RSSI level = TRSSI - HRSSI). Between these two levels, DATAMSG validation depends on the
previous measurement.
Example:
TRSSI = 32 and HRSSI = 4 implies High RSSI level = 26 and Low RSSI level = 28
CC
measurement can not be done when the AT86RF211 is in power-down mode.
Number
of Bits
1
2
1
1
1
1
1
1
1
1
CC
measurement, it is possible to measure the DC output of the discriminator.
NOK
27
Comments
reserved, must be kept to reset value: 0
RX frequency selection
(00)
(01)
Crystal frequency
0: 10.245 MHz (when IF1 = 10.7 MHz)
1: 20.945 MHz (when IF1 = 21.4 MHz)
Discriminator range
0: Narrow Discriminator BW
1: Standard Discriminator BW
Polarity of DATAMSG
0: inverted signal
1: direct signal
Data Slicer reference voltage
0: external reference: SKFILT pin voltage
1: internal reference: DAC level voltage
reserved, must be kept to reset value: 0
reserved, must be kept to reset value: 0
0: internal ADC sets to V
1: internal ADC sets to DISCOUT DC level measurement
reserved, must be kept to reset value: 0
2
2
: F0
: F1
NOK
32
(1)(2)(4)(3)
NOK
35
(Continued)
CC
(10)
(11)
measurement
CC
2
valid
2
OK
: F2
36
: F3
voltage. When the V
valid
OK
35
valid
OK
32
CC
CC
voltage is measured, the RSSI measurement is
in reception mode.
valid
OK
29
valid
OK
28
NOK
reset value: (10)
27
1942C–WIRE–06/02
reset value: 0
reset value: 1
reset value: 1
reset value: 1
reset value: 0
NOK
25
2