AT86RF211DB-868LT Atmel, AT86RF211DB-868LT Datasheet - Page 3

• Manufacturer Part Number: AT86RF211DB-868LT
• Description: BOARD DAUGHTER AT86RF211/868MHZ
• Manufacturer: Atmel

Specifications of AT86RF211DB-868LT

• Module/board Type: Daughter Board
• For Use With/related Products: AT86RF211 @ 866MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT86RF211-DB868107; AT86RF211DB868107; AT86RF211DB868107; AT86RF211DB868LT

Sleep Mode = Minimization of
Reception Window
Typical Sequence
2186A–WIRE–08/02
The reception window can be reduced to a minimum thanks to:
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If no correct message has been received, the AT86RF211 is going back to sleep mode
and try again after WPER. If a correct message is caught, then its Data field (if any) is
stored into a register and the WAKEUP pin is activated to drive the microcontroller
external interrupt (active state of this pin can be chosen). WAKEUP bit of STATUS reg-
ister is also set.
As indicated before, Atmel suggests that the wake-up mode should be implemented
with a very short WL1 (2 ms to make sure that PLL is locked & RSSI conversion com-
pleted). This way:
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its division into 2 time slots called WL1 & WL2: at the end of WL1, RSSI is checked
and scan goes on during WL2 only if there is a "radio activity", that is to say if
RSSI > predefined threshold. Choosing a very short value for WL1 will lead to a
Σ I ∆t as small as possible when the master is not sending anything (most of the
time for most of the applications!).
a built-in recognition of the received data
a built-in check of RSSI
the receiver will be in Rx mode during 2 ms only if no significant "radio activity" is
detected, will go on listening only if it is worth doing so.
a message is taken into account only if its level is > RSSI threshold (if WL1 is longer
and a full correct message is received before its end, then it will be taken into
account whatever the RSSI level may be).
AT86RF211 (TRX01)
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