User Manual

CompactRF
TM
Operating Manual: Chapter 2 Electrical/Physical 9
2.3 AC Characteristics
Sym Characteristic Min Typ Max Units
T
TOUT
Reset Delay Time-Out Period 12.8 16.0 19.2 ms
T
CFG
\Config. pulse duration See Note ms
T
S2SD
\Sleep low to internal sleep delay 0 See Note ms
T
SN
Snooze duration 10 ms
T
SNIFF
Sniff duration 100 us
T
WDLY
\Sleep high to internal wakeup 0 T
SN
ms
Note: The minimum duration for T
CFG
is one hop interval. The hop interval is set by the user,
and is stored in register S109. The maximum delay for T
S2SD
is also one hop interval.
Figure 2 provides timing information for both power-up reset and the \Reset
line operation. A fixed internal reset delay timer of roughly 16ms is triggered
as the V
POT
or V
RST
threshold is reached.
T
V
VDV
\Reset
Internal Reset
CC
TOUT
RST
POT
Figure 2. Reset Timing
Figure 3 illustrates the sleep operation for the CompactRF. When the \Sleep
line is asserted, the modem will internally go to sleep within one hop interval.
While sleeping, the modem will “sniff” every 10 ms to check if the \Sleep
line has again gone high. If the \Sleep line is low, the modem goes back to
sleep. If it is high, the modem wakes up and resumes normal operation.
\Sleep
\Internal Sleep
T
SNIFF
T
S2SD
T
SN
T
WDLY
Figure 3. Sleep/Wakeup Timing