AT86RF211DB-868LT Atmel, AT86RF211DB-868LT Datasheet - Page 2

• 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

Principle of the
Embedded Wake-up
Procedure
Sleep Mode = Very Low Power
Mode
2
AT86RF211 (TRX01)
Sleep mode
Oscillator settling
Reception mode
The "peak" consumption in Receive (Rx) or Transmit (Tx) mode of any high-perfor-
mances transceiver makes it necessary to implement a power management protocol for
long term battery operated systems.
The principle is generally as follow: the system is made of battery operated slaves (with
highly critical power requirements) and a master. Slaves are in a very low power mode
most of the time (i.e. 99.9%, the "sleep period"), wake-up periodically and wait for a ded-
icated message sent by the master. When such a message has been received, they
make a relevant decision.
The two conditions to achieve a very low average power consumption are:
•
•
Usually, the microcontroller is in charge of managing such a protocol. The AT86RF211
features a stand-alone wake-up function. Once the chip has been set-up in this mode, it
will periodically go into reception mode and try to catch an expected message (stand
alone operation).
The sleep mode current of the AT86RF211 is typ. 3 µA. Because this is a stand-alone
mode, the microcontroller is always in power-down mode (even during reception win-
dows) with no timer running but only the possibility to be woken-up by an external
interrupt given by the AT86RF211: this happens only when a valid message has been
received.
WL1 (+WL2)
very low sleep mode current (a few µA),
reduction of reception window as much as possible (a few ms).
WPER
2186A–WIRE–08/02