AT86RF211DB-868LT Atmel, AT86RF211DB-868LT Datasheet - Page 10

• 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

Message Format
Expected Message's Format
Notes:
10
FIELD
Length
Value
Set-up
Processing of
received data
Usage
Make sure to meet chapter “Practical Implementation” on page 5 requirements for data encoding for all these fields!
1. One message is made with only one Header. Do NOT insert any additional header because the first recognition will inhibit
2. The Header is a predefined sequence of 10 bits that CANNOT be changed and acts like a synchronization. The data rate is
3. The DATA field can be used in two different ways:
AT86RF211 (TRX01)
detection mechanism until a message aborts or ends: the second header would be regarded as an address and the mes-
sage lost. The whole message must be sent each time.
measured during the Header and is used to sample the rest of the message. So the duration of all '0' or '1' bits must be iden-
tical in the whole Header field with the duty cycle requirement given in chapter “Practical Implementation of the Wake-up
Mode” on page 5.
Warning: the length of the last bit of the header (10
order to guarantee a good trigger of the data/address fields bits.
For instance, if the expected data rate is 4800 bps, the bits duration is 0.208 ms for all the Header field but the last one
which must be about 0.104 ms (no accuracy requirement concerning this bit).
Warning: an extra bit '0' (required by the hardware) MUST be added at the end of the device's address (LSB position).
Example: 3 devices in a Wake-up mode, address must be coded with 2 bits + 1 extra bit '0'. ADDL (length of address field)
must correspond to 3 bits: '00010' (and not '00001').
- fixed data length: data length is set by DATL of WUC register from 1 to 32 bits and STOP field is not used.
- variable data length: data length is variable from 1 to 32 bits. STOP field must be used. Extracted data length (= data
received in wake-up message before STOP field) is available into MSGDATL of STAT register. In this mode DATL of WUC
register must be set to 32 bits.
HEADER
10 bits
1010100001b
Header must be
correct to go further
Mandatory
(1)
A wake-up message is made of 4 fields (only one is mandatory). They are defined by
writing into the 4 dedicated registers. Please carefully read the notes and warnings
which follow this table.
ADDRESS
0 to 20 bits
ADD of WUC (validation)
ADDL of WUA (length)
ADD of WUA (device's address)
(if this field is active):
- compared to ADD of WUA
Option (active if ADD = 1)
which means that devices will have the following address:
ADD1 = '01' + '0'
ADD2 = '10' + '0'
ADD3 = '11' + '0'
but needed (the 20 bits duration takes this extra bit "0" into account).
This extra bit must also be added in the wake-up message that will be sent,
so 19 useful bits are available for the device's address, the last is useless
(2)
th
) must be reduced down to 50% of the other bits duration, in
DATA
0 to 32 bits
DATA of WUC (validation)
DATL of WUC (length)
(if this field is active):
- received data is stored in WUD
- extracted data length is stored into
MSGDATL of STAT (variable length
mode only)
Option (active if DATA = 1)
The mode with no data can simply
be used to wake-up the chip
(3)
STOP
4 bits
1111b after 0
0000b after 1
STOP of WUC
(validation)
Option (active if
ADD = 1)
2186A–WIRE–08/02
(4)