參數(shù)資料
型號： PCF5001
廠商： NXP Semiconductors N.V.
英文描述： POCSAG Paging Decoder
中文描述： 尋呼POCSAG碼解碼器
文件頁數(shù)： 16/44頁
文件大?。?/td> 273K
代理商： PCF5001
1997 Mar 04
16
Philips Semiconductors
Product specification
POCSAG Paging Decoder
PCF5001
Fig.10 Status indication cadences.
MCD461
ON
OFF
SILENT
tSTON
tSTOF
tSTON
tSTOF
tSTON
7.7
Silent call storage and repeat mode
When programmed for alert only pager the PCF5001
provides a call alert storage for storing of call alerts
received during SILENT status or for call alerts which
caused the decoder to enter
repeat
mode. Call alert is not
stored, when call indication is terminated by action of the
status request and reset input (SR).
Allowing the call indication to time-out by expiration of a
sixteen second alert operation causes the ‘repeat’ mode to
be entered, while operating in ON status or SILENT status.
Such call alerts are stored for later repeated call alert on
interrogation by the user. When ‘repeat’ mode has been
entered and the decoder operates in ON status, the repeat
call store is interrogated by pulsing the status request and
reset input (SR) or on switching to ON status if the decoder
operates in SILENT status. When SILENT override calls
are received, which entered the ‘repeat’ mode,
interrogation of repeat call store operates as in decoder
ON status. After interrogation of repeat call store and
subsequent generation of all stored call alerts the call store
is cleared and the ‘repeat’ mode is terminated.
When programmed by means of SPF16, a repeat alert
cadence is generated periodically, whenever ‘repeat’
mode has been entered. Operating in ON status causes
the repeat alert cadence to be generated at HIGH-level
and warbled by means of an additional 16 Hz and 1024 Hz
signal (respective 1365 Hz for SPF31 = 1) as shown in
Fig.11. The LED output indicates the same alert cadence
and alert warble. In SILENT status only the LED output is
active.
No call alert storage occurs when the decoder is
programmed for ‘display pager’ mode.
7.8
Duplicate Call Suppression
The PCF5001 provides a Duplicate Call Suppression with
time-out facility, to identify duplicate call reception. When
selected by programming of SPF14, the PCF5001 inhibits
any duplicate call alert in ‘a(chǎn)lert-only pager’ mode.
In ‘display pager’ mode, duplicate call indication is
achieved only via the serial microcontroller interface. A call
is assumed to be duplicate if its address and function bit
setting is equal to the latest received call, which initialized
the call address and function bit reference. The Duplicate
Call Suppression time-out is selectable by programming of
SPF06 and SPF07.
7.9
LED indicator
The PCF5001 provides for visual signalling using a LED
via output OL.
Call alert indication is provided by the LED with the same
cadence and warble modulation as for the alerter outputs
AL and AH. Call alert indication occurs in ON and SILENT
status and automatically terminates after sixteen seconds
time-out unless terminated by pulsing the status request
and reset input (SR).
When detecting an out-of-range condition and enabled by
programming of SPF15, the LED output provides an
out-of-range indication as shown in Fig.12.
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