AMIS-53050 Datasheet, PDF (70/107 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53050 Frequency Agile Transceiver
Data Sheet
Table 54: Sniff Config - 0X11 [17]
Bit Name
State
000
001
010
7:5
SNIFF_FILTER
011
100
101
110
111
11
4,3 Auto-threshold
10
count value
01
00
2
NU
1
NU
0
Sniff interval
resolution
1
0
Comment
RSSI filter bandwidth =300Hz
RSSI filter bandwidth = 600Hz
RSSI filter bandwidth = 1.2kHz
RSSI filter bandwidth = 2.4kHz
RSSI filter bandwidth = 4.8kHz
RSSI filter bandwidth = 9.6kHz
RSSI filter bandwidth = 19.2kHz
RSSI filter bandwidth = 38.4kHz
100
500
100
Disable
This is the number of Sniff cycles to count false wake ups due to the
noise level, so that the threshold level can be adjusted. It is
adjusted higher when the number of false wake ups exceeds the
wake up target number. It is adjusted down when there are fewer
false wake ups than the target number. Entering a number other
than 00 in this register will enable the auto-threshold.
Sniff interval timer resolution is 100ms (interval between sniff signal detection
events is (sniff interval) times (sniff resolution)
Sniff interval timer resolution is 500us (interval between sniff signal detection
events is (sniff interval) times (sniff resolution)
6.7.2.2. Sniff Interval Timer
This is used to specify the period (time between sniff events) of the sniff operation. The sniff interval is this value times the sniff interval
resolution value (set in the sniff config register).
Table 55: Sniff Interval Timer - 0X12 [18]
Bit Name
Comment
7:0 _{SNIFF_INT [7:0]} Sniff interval timer =SNIFF_INT* Sniff interval timer resolution
6.7.2.3. Energy Dwell Timer
This is the length of time the receiver will stay on in a sniff cycle, checking for the presence of a signal. It is also used for a receive
command when the wake on energy bit is asserted in RX config. This may need be set to a fixed value, such as 10 milli-seconds, to
make the CCA compatible with a market or government standard.
Table 56: Energy Dwell Timer - 0X13 [19]
Bit Name
Comment
7:0 _{E_DWELL[7:0]}
00h: Energy dwell timer not used, energy determined by an impulse sample
01h – FEh: Energy dwell time = E_DWELL * 100us
FFh: Receiver remains on until energy threshold is met
6.7.2.4. Energy Threshold
This sets the threshold for either wake on energy or sniff mode signal acquisition. If the automatic noise floor detection is enabled in
sniff, the AMIS-53050 will overwrite the contents of this register each time a new threshold is calculated.
AMI Semiconductor – Jan. 07, M-20639-002
70
www.amis.com