DS_S5T8702 Datasheet, PDF (46/62 Pages) Samsung semiconductor – FEEX ALPHANUMERIC DECODER II

S5T8702
FEEX^TM ALPHANUMERIC DECODER II
Receiver
control
line setting
160 ms
Warm up Warm up Warm up Warm up Warm up Warm up
off time
time 1
time 2
time 3
time 4
time 5
Off
Warm up Warm up Warm up Warm up Warm up 1600sps or 3200sps
setting 1 setting 2 setting 3 setting 4 setting 5
sync setting
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
EXTS1 &
EXTS0 signals
are expected to
be valid here
Figure 11: Automatic Receiver Warm Up Sequence
HOST INITIATED RECEIVER WARM UP SEQUENCE
The host can cause the S5T8702 to warm-up the receiver in three ways: (1) by turning on S5T8702 by setting the
ON bit in the control packet; (2) by requesting a noise detect by setting the SND bit in the roaming control packet;
or (3) by requesting an A-word search by setting the SAS bit in the roaming control packet. When the S5T8702
warms up the receiver in response to a host request, the first warm up setting, if enabled, is applied to the
receiver control lines for the amount of time programmed for that setting. Each subsequent warm up setting is
applied to the receiver control lines for their corresponding time until a disabled warm up setting is found. Once a
disabled warm up setting is found, the "3200sps Sync Setting" (for ON and SND warm ups) or the "1600sps Sync
Setting" (for SAS warm ups) is applied to the receiver control lines and the decoder does not expect valid signal
until after the "3200sps Sync Warm Up Time" (for ON, SND, and SAS warm ups) has expired. In figure 12 on
page 48 the receiver warm up sequence when the host initiates a warm-up sequence and when all warm up
settings are enabled is shown.
Receiver
control
line setting
Warm up
time 1
Warm up
time 2
Warm up
time 3
Warm up
time 4
Warm up 3200sps
time 5 sync warm
up time
Off
Warm up Warm up Warm up Warm up Warm up
setting 1 setting 2 setting 3 setting 4 setting 5
3200sps
sync setting
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
Possible
LOBAT
check
Possible EXTS1 &
LOBAT EXTS0 signals
check are expected to
be valid here
Figure 12: Host Initiated Receiver Warm Up Sequence
46