AT86RF211DB-868LT Atmel, AT86RF211DB-868LT Datasheet - Page 16

• 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

Addressing by "Data rate"
(individual or group)
16
AT86RF211 (TRX01)
- WUC register: WUE = '1', DATA = '1', STOP = '0', DATAL = '01001', ADD = '1',
MSGTST = '0', WPER = '001100011', WL1 = '0000001', WL2 = '011'.
To carry out an individual wake-up, then ADDL = '0 0110' (in WUA) and the wake-up
message will be:
for number 1/group 1/subgroup 1 with 0111000101 as data to be sent.
'1010100001'(Header) + '001 0010'(Address) + '0111 00 0101'(Data)
Notes:
•
•
Another way to address the devices selectively is to use the bit rate. As indicated before,
a clock is extracted from the header and (if relevant bits are selected) can be compared
to a value that has been set-up (with a defined tolerance). Should the bit rate be differ-
ent, the message is not recognized as a wake-up message. This way of addressing
allows to minimize the length of the wake-up message since no address is needed.
Example:
- 5 receivers waiting for a wake-up message
- no Address needed
- no Data needed
- stuff mechanism inhibited.
- WAKEUP pin active low
- Rate check used for addressing with about 2% for the tolerance.
- Wake-up test every second
Choice of datarates:
- data rate 1 = 8 kbits/s, i.e. 125 µs per bit
- data rate 2 = 9 kbits/s, i.e. 111 µs per bit
- data rate 3 = 10 kbits/s, i.e. 100 µs per bit
- data rate 4 = 11 kbits/s, i.e. 90.9 µs per bit
- data rate 5 = 12 kbits/s, i.e. 83.3 µs per bit
Message duration (10 bits of Header) is between (10 x 83.3 µs = 833 µs) and (10 x
125 µs = 1.25 ms). In order to reduce Rx duration as much as possible, the configura-
tion is set up with the minimum required WL1 and WL2. For all the devices, WL1 = 2 ms
and WL2 = 4 ms, so total maximum test duration is 6 ms.
- CTRL1: WUEN = '1', PDN = '0', so bit 26 = '1' & bit 31 = '0'.
- WUR: WUOP = '00', RATECHK = '1', RATE = 'xx xxxx xxxx' depending on datarate,
RATETOL = '00010'.
WL2 set to 6 ms does not impact the budget of the energy consumption as this
period is active only if the RSSI is above the pre-defined value.
The Address and Data fields of the message respect the minimum numbers of
following bits set to the same value.
2186A–WIRE–08/02