TDA5240 Datasheet, PDF(113/284 Page) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

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TDA5240 Datasheet, PDF (113/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

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TDA5240

Functional Description

2.6.2.1 Self Polling Modes

Four 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 following 4 Polling Modes are available and can be configured via 2 bits in the

configuration register SPMC:

â¢ Constant On-Off (COO)

â¢ Fast Fall Back to SLEEP (FFB)

â¢ Mixed Mode (MM)

â¢ Permanent Wake-Up Search (PWUS)

A detected wake-up data sequence or an actual value for RSSI or Signal Recognition (a

combination of Signal Detector and Noise Detector, see Chapter 2.4.8.1) exceeding a

certain adjustable threshold forces the TDA5240 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 SPMRT helps to

fit the final On-Off timing to the calculated ideal timing.

2.6.2.2 Constant On-Off Time (COO)

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 Chapter 2.5.1.2 Data Interface can be used.

Data Sheet

113

V4.0, 2010-02-19

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