TDA5230 Datasheet, PDF (56/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
Single Channel, Single Config
run mode
RX polling
A
1
sleep mode
TAON
TOFF
TMasterPeriod
Channels = 1
TMasterPeriod = TAON + TOFF
Multi Channel, Single Config
run mode
RX polling
A
1
A
2
A
3
sleep mode
TAON TAON TAON
TOFF
TMasterPeriod
Channels = m
TMasterPeriod = m*TAON + TOFF
Multi Channel, Dual Config
run mode
RX polling
A
1
A
2
A
3
sleep mode
TAON TAON TAON
B
1
TBON
B
2
TBON
TMasterPeriod
TOFF
Channels Config A = m
Channels Config B = n
TMasterPeriod = m*TAON + n*T BON+ TOFF
Figure 24 Constant On/Off Time
Calculation Example
For all calculation examples for On and Off Time we will use following example data:
• Configuration A and B used
• Three channels to be scanned in Configuration A, two channels in Configuration B
• Configuration A Data Rate 10 kb/s, +/-10%, Configuration B Data Rate 5 kb/s, +/-10%
• Length of usable Wake Up Pattern is 2000 bits (for both Data Rates)
• Wake Up Criterion requires 10 bits equal to 20 chips
• f_sys is 13.225625 MHz (used for 433.92 MHz RF), this means Receiver Start Up Time
is 0.576 ms, Channel Hop Latency is 0.06 ms
Calculation of the Master Period Time (T_MasterPeriod).
T_MasterPeriod depends on:
• Length/duration of transmitted Wake Up Pattern
• Data Rate and tolerance
• Length/duration of Wake Up criterion (Chapter 2.4.12 Wake Up Generation Unit)
Imagine, the transmission of the Wake Up Pattern starts very little time after the receiver
starts polling on this channel. Using our example data, the receiver recognizes only 19
chips out of the required 20, but then the State Machine switches to the next channel.
Therefore, the Master Period Time has to be short enough that inside of the (shorter)
transmitted Wake Up Pattern, this channel can be successfully polled again.
1) Calculation of Wake Up Times for Each Configuration and Channel:
Data Sheet
52
Version 4.0, 2007-06-01