AT86RF211DAI-R datasheet(28/48 Pages) ATMEL

28 / 48 page

AT86RF211

1942C–WIRE–06/02

Notes:

1. The same ADC is used to measure RSSI or VCC voltage. When the VCC voltage is measured, the RSSI measurement is

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

CC in reception mode.

2. VCC measurement can not be done when the AT86RF211 is in power-down mode.

3. While in V

CC measurement, it is possible to measure the DC output of the discriminator.

4. Description of RSSI measurement with hysteresis mechanism: if the RSSI measurement is higher than the high RSSI level,

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

–

reserved, must be kept to reset value: 0

RXFS

RX frequency selection

(00)

2:F0

(10)

2:F2

(01)

2: F1

(11)

2:F3

reset value: (10)

XTALFQ

Crystal frequency

0: 10.245 MHz (when IF1 = 10.7 MHz)

1: 20.945 MHz (when IF1 = 21.4 MHz)

resetvalue:0

FSKBW

Discriminator range

0: Narrow Discriminator BW

1: Standard Discriminator BW

resetvalue:1

FSKPOL

Polarity of DATAMSG

0: inverted signal

1: direct signal

resetvalue:1

DSREF

Data Slicer reference voltage

0: external reference: SKFILT pin voltage

1: internal reference: DAC level voltage

resetvalue:1

–

reserved, must be kept to reset value: 0

–

reserved, must be kept to reset value: 0

MOFFSET

0: internal ADC sets to V

CC measurement

1: internal ADC sets to DISCOUT DC level measurement

resetvalue:0

–

reserved, must be kept to reset value: 0

MRSSI sequence

27323536

3229282725

RSSI level

NOK

DATAMSG

valid

Table 6. CTRL1 Detailed Description(1)(2)(4)(3) (Continued)

Name

Number

of Bits

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