W93910 Datasheet, PDF (7/35 Pages) Winbond – ERMES PAGING DECODER

W93910
FUNCTION DESCRIPTION
The W93910 ERMES paging decoder can be used to easily construct an ERMES pager with RF
receiver and µC. To initialize the decoder, first, 192 option bits must be programmed through TXCLK,
TXDATA pin by µC. After the oscillator has been turned on and is stable, the decoder can then receive
and decode the 2 bit digital QFSK signal from the RF receiver. With built-in PLEN, RFEN, QC1 and QC2
controls, the decoder can warm up and shut down the frequency synthesizer and IF demodulator for
optimum reception in different stages.
While starting, the pager will begin to search the home channel. If system synchronization can't occur in
the current channel, the pager will change to the next channel according to the channel scan algorithm
until synchronization occurs. Once synchronized with the channel, the pager will lock to its own batch,
ready to receive paging message. If an address-matched message is received, the de-interleaved data
will be transferred to µC through MDATA and MCLK pin. With the automatic channel scan algorithm, the
decoder will inform µC by PLEN and XCNCG to change channel during channel scan and normal
mode.
RECEIVING OPERATION FLOW
Power on
and XREST
192 options
setting
ON
Oscillator stable
CHANNEL
SCANNING MODE
SYNC MODE
IDLE MODE
LOCK MODE NORMAL MODE
Figure 1. Operating Flow Chart
Publication Release Date: Auguest 1999
-7-
Revision A1