TDA5230 Datasheet, PDF (55/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
2.4.6.1 Self Polling Modes
Three polling modes are available to fit the polling behavior to the expected wake up
patterns and to optimize power consumption in Self Polling Mode.
The Polling Modes are selected via the Self Polling Mode Control (SPMC) register.
The following four modes are available:
– Constant On/Off
– Fast Fall Back to Sleep
– Mixed Mode(Cfg.A: Constant On/Off; Cfg.B: Fast Fall Back to Sleep)
– Permanent Wake Up Search
A detected wake up forces the chip into Run Mode Self Polling.
In all modes, the timing resolution is defined by the Reference Timer, which scales the
incoming frequency (fsys/64) corresponding to the value which is defined in the Self
Polling Mode Reference Timer (SPMRT) register. Changing values of SPRMT help to fit
the final on/off timing to the calculated ideal timing. Use the TDA523x IAF Configuration
Tool for optimization.
2.4.6.2 Constant On/Off Time
In this mode, there is a constant on and a constant off time. Therefore, the resulting
master period time is constant. The on and off time are set in the ASPMONT0,
ASPMONT1, BSPMONT0, BSPMONT1, SPMOFFT0 and SPMOFFT1 registers. The
On Time configuration is done separately for configuration A and B. The selection for
single or dual configuration is done in the CMC0 register. When single configuration is
selected only configuration A is used. The number of channels is defined in the
AMT/BMT register. In the case of multi-channel or combination of multi-channel and dual
configuration mode, the configured On Time is used for each channel in each
configuration. The following figure shows all possible scenarios.
Data Sheet
51
Version 4.0, 2007-06-01