TDA5230 Datasheet, PDF (61/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
T_ON for Configuration A is calculated according Const On/Off rules, T_ON for Configuration
B is calculated according Fast Fall Back to Sleep rules.
Single Channel, Single Config
run mode
RX polling
A
1
sleep mode
TAON
TBON
TOFF
TMasterPeriod
Channels = 1
T_MasterPeriod = T_AON + T_BON + T_OFF
Multi Channel, Single Config
run mode
RX polling
A
1
A
2
A
3
sleep mode
TAON TAON TAON
TBON
TOFF
TMasterPeriod
Channels = m
T_MasterPeriod = m*T_AON + T_BON + T_OFF
Multi Channel, Dual Config
run mode
RX polling
A
1
A
2
ABB
312
sleep mode
TAON TAON TAON _TBON
TMasterPeriod
TOFF
Channels Config A = m
Channels Config B = n
T_MasterPeriod = m*T_AON + T_BON+ T_OFF
Figure 26 Mixed Mode
Calculation Example
The same example data is used as for Constant On/Off Time:
• 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)
The Master Period Time has to be short enough that inside of the (shorter) transmitted
Wake Up Pattern, the channel with the longest Wake Up sequence can be polled twice.
This calculation is equal to the calculation in Constant On/Off Time.
1) Calculation of Wake Up Times for Each Configuration and Channel:
T_{WakeUp_ConfigAChannel1}=0.576 ms+(7.625 bits+10 bits)/(10kb/s*0.9)=2.55 ms
T_{WakeUp_ConfigAChannel2}=0.06 ms+(7.625 bits+10 bits)/(10kb/s*0.9)=2.02 ms
T_{WakeUp_ConfigAChannel3}=0.06 ms+(7.625 bits+10 bits)/(10kb/s*0.9)=2.02 ms
T_{WakeUp_ConfigBChannel1}=0.06 ms+(7.625 bits+10 bits)/(5kb/s*0.9)=3.98 ms
Data Sheet
57
Version 4.0, 2007-06-01