W93910 Datasheet, PDF (11/35 Pages) Winbond – ERMES PAGING DECODER

W93910
CHANNEL SCAN CONTROL
The channel scanning and switching are controlled by the decoder. Table 7 shows the channel number
and frequency. In channel scan mode, the decoder will first search the home channel, defined by the
CH3−CH0. Therefore, the synthesizer should be programmed to home channel before the channel
scan mode. If the pager can not detect a valid signal in the home channel, the pager will change to the
next channel to search until the decoder lock to the signal. The scanning sequence is shown in Figure 5,
and needs to be followed to avoid losing signal.
OPTION BIT
CH3−CH0
0000
0010
0100
FUNCTION
Home channel number
RF center frequency
0
169.425 MHz
2
169.475 MHz
4
169.525 MHz
0110
1000
1010
6
169.575 MHz
8
169.625 MHz
A
169.675 MHz
1100
1110
1111
1101
C
169.725 MHz
E
169.775 MHz
F
169.800 MHz
D
169.750 MHz
1011
1001
B
169.700 MHz
9
169.650 MHz
0111
0101
0011
0001
7
169.600 MHz
5
169.550 MHz
3
169.500 MHz
1
169.450 MHz
Table 7. Channel number and frequency
Ch 0
Ch 2
Ch A
Ch C
Ch 3
Ch 1
Figure 5. Channel scan sequence
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Publication Release Date: Auguest 1999
Revision A1