W93910 Datasheet, PDF (12/35 Pages) Winbond – ERMES PAGING DECODER

W93910
The frequency channel adjustment is implemented by XCNCG, PLEN, and µC. XCNCG is used to
output a high pulse to inform µC of the frequency channel increment request. µC needs to count the
XCNCG high pulse during the PLEN active period. Each XCNCG pulse indicates one frequency channel
increment. During the PLEN inactive period, the µC should program the synthesizer with suitable data
based on the previous XCNCG counting result to ensure the receiver can catch the right channel.
During the lock mode, the pager will fix at the same channel as shown in Figure 6 and 7. The normal
mode operation is described in Figure 8 and 9. The batch number setting is shown in Table 8.
OPTION BIT
FUNCTION
bn3−bn0
Batch Number
0000
A
0001
B
0010
C
0011
D
0100
E
0101
F
0110
G
0111
H
1000
I
1001
J
1010
K
1011
L
1100
M
1101
N
1110
O
1111
P
Table 8. bn3−bn0 batch number format
IDLE MODE
If there is no meaningful signal after scanning the channel several times, the decoder will enter idle
mode to save power, and will re-enter the channel scan mode after a period of time.
SYNC MODE
While synchronizing with the paging system, the decoder enters sync mode and the SYNVAL pin
outputs LOW The decoder will then change to lock mode or normal mode based on the receiving
information.
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