AT86RF211SDK E2V, AT86RF211SDK Datasheet - Page 29

• Manufacturer Part Number: AT86RF211SDK
• Description: KIT DEV FOR AT86RF211/915MHZ
• Manufacturer: E2V
• Series: Smart RFr
• Type: Transceiverr

Specifications of AT86RF211SDK

• Frequency: 915MHz
• For Use With/related Products: AT86RF211 @ 915MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT86RF211-DK; AT86RF211-DK915107; AT86RF211DK; AT86RF211DK915107; AT86RF211DK915107

Figure 2-25. Clock Recovery
2.3.2
5348B–WIRE–03/06
DATAMSG
DATACLK
Data Rate Programming
CLK signal is available as soon as the DATACLK bit is programmed, regardless of the
state of the DATAMSG pin.
The programmed data rate enables the creation of a basic clock at the programmed
DATARATE frequency at the beginning of reception. The clock is then shifted if neces-
sary from the tolerance value, depending on the previous DATA transition; the clock is
moved later or sooner, depending on the gap between CLOCK and DATA.
For example:
If DATARATE = 50 kbps, which is equivalent to a duration of 200 × T for 1 bit, with
T = 100 ns = base clock period.
If DATATOL = 4% × DATARATE = 8 × T.
This value must only be programmed when the DATA clock is needed on the chip’s
DATACLK output pin.
The DATA rate can be programmed from 1 to 100 kbps with 14 bits of the CTRL2
register.
DATARATE is the period of the data rate and can be programmed with a resolution
given by the crystal oscillator period:
Table 2-7 provides examples of data rate values with the 10.245 MHz oscillator:
Table 2-7.
200T
DATARATE[13:0]
(102)
(205)
(vv)
(534)
(1024)
(1067)
(2135)
(4269)
(10246)
• 10.245 MHz oscillator, period = T = 97.6 ns
• 20.5 MHz oscillator, period = T = 97.56 ns
• 20.945 MHz oscillator, period = T = 95.5 ns
10
10
10
10
10
10
10
10
10
Expected Values
Data Rate Values with an 10.245 MHz Oscillator
Tol = 8T
Synchronized Values with DATAMSG
Rate
100 kbps
50 kbps
19.2 kbps
10 kbps
9.6 kbps
4.8 kbps
2.4 kbps
1 kbps
Tol = 8T
Period
1 bit ~ 102 × T
1 bit ~ 205 × T
1 bit ~ vv × T
1 bit ~ 534 × T
1 bit ~ 1024 × T
1 bit ~ 1067 × T
1 bit ~ 2135 × T
1 bit ~ 4269 × T
1 bit ~ 10246 × T
Expected Values
AT86RF211S
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