tda5225 Infineon Technologies Corporation, tda5225 Datasheet - Page 68

• Manufacturer Part Number: tda5225
• Description: Enhanced Sensitivity Multi-channel Quad-conf Igurat Ion Receiver With Digital Slicer
• Manufacturer: Infineon Technologies Corporation

2.6.2.1
An actual value for RSSI exceeding a certain adjustable threshold forces the TDA5225
into Run Mode Self Polling.
The timing resolution is defined by the Reference Timer, which scales the incoming
frequency (f
Reference Timer (SPMRT) register. Changing values of SPMRT helps to fit the final On-
Off timing to the calculated ideal timing.
2.6.2.2
In this mode there is a constant On and a constant Off time. Therefore also the resulting
master period time is constant. The On and Off time are set in the SPMONTA0,
SPMONTA1, SPMONTB0, SPMONTB1, SPMONTC0, SPMONTC1, SPMONTD0,
SPMONTD1, SPMOFFT0 and SPMOFFT1 registers. The On time configuration is done
separately for Configuration A, B, C and D.
When Single-Configuration is selected then only Configuration A is used. The number
of RF channels is defined in the A_CHCFG register (Single-Channel or Multi-Channel
Mode).
Multi-Configuration Mode allows reception of up to 4 different transmit sources. The
corresponding RF channels can be defined in the A_CHCFG, B_CHCFG, C_CHCFG
and D_CHCFG registers. In the case of Multi-Channel or combination of Multi-Channel
and Multi-Configuration Mode, the configured On time is used for each RF channel in a
configuration. The diagram below shows possible scenarios.
All receive modes described in
Data Sheet
Self Polling Mode
Constant On-Off Time (COO)
sys
/64) corresponding to the value, which is defined in the Self Polling Mode
Chapter 2.5.1.2 Data Interface
68
Functional Description
can be used.
V1.0, 2010-02-19
TDA5225