TDA5240 Datasheet, PDF (121/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5240
Functional Description
2.6.2.5 Permanent Wake-Up Search (PWUS)
In this mode the receiver will work in Fast Fall Back Mode, but it will not go back to the
SLEEP state after the last channel has been searched. Instead, it will start again from
the beginning (Configuration A, RF Channel 1) until the On time has elapsed. The timing
calculation can be seen in Figure 86. Ultrafast Fall Back to SLEEP functionality can be
used as well.
Only the following receive modes (see Chapter 2.5.1.2 Data Interface) can be used:
• Packet Oriented FIFO Mode (POF)
• Packet Oriented Transparent Payload Mode (POTP)
• Transparent Mode - Chip Data and Strobe (TMCDS)
Single Channel , Single Config
run mode
RX
polling
A
1
sleep mode
A A A AA
1 1 1 11
TAO N
TOFF
TMasterPeriod
Multi Channel , Single Config
run mode
RX polling
AA
12
A
3
AA A A
12 3 1
sleep mode
TAO N
TOFF
TMasterPeriod
Multi Channel , Multi Config
RX
run mode
polling
AA
12
A
3
BB
12
A
1
A
2
sleep mode
TAON
TOFF
TMasterPeriod
Figure 86 Permanent Wake-Up Search
Channels = 1
TMasterPeriod = TAON + TOFF
Channels = m
T_MasterPeriod = TAON + TOFF
Channels Config A = m
Channels Config B = n
T_MasterPeriod = TAON+ TOFF
Data Sheet
121
V4.0, 2010-02-19