參數(shù)資料
型號(hào)： 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)： 14/44頁
文件大小： 273K
代理商： PCF5001
1997 Mar 04
14
Philips Semiconductors
Product specification
POCSAG Paging Decoder
PCF5001
7.5
Generation of output signals
The PCF5001 provides output indications for call alert,
repeat mode alert, out of range alert, battery-low alert,
status indication alert and start-up alert. Some of the alert
functions may be freely configured by programming of
SPF bits within the EEPROM.
Table 3 shows the outputs which are used for special
output indications, if the decoder operates in ON status.
Remark:
reception of special SILENT override calls
causes the decoder to generate call alert indication via AL
and AH even if it operates in SILENT status.
Table 3
Output signals
Note
1.
Entries in parenthesis are not valid, if the decoder operates in SILENT status.
ALERT FUNCTION
OUTPUT ACTIVE
(1)
AL
AH
(yes)
(SPF16)
(yes)
(yes)
OL
OM
OR
yes
BL
yes
Start-up
Status indication
Call reception
Repeat mode
Out-of-range
Battery-low
Alarm input
(yes)
yes
(yes)
(SPF16)
(yes)
(yes)
yes
yes
SPF16
SPF15
yes
yes
SPF11
7.6
Alerter
The PCF5001 provides the AL and AH outputs for
acoustical LOW-level and HIGH-level signalling.
LOW-level alerting is provided by the AL output only.
For HIGH-level alerting both, AL and AH are active in
anti-phase. The square-wave output signals produce tone
alert cadences by means of a magnetic or piezo ceramic
beeper. The alert frequency, 2048 Hz or 2731 Hz
square-wave, is selected by programming of SPF31.
When valid calls are received while operating in ON status,
the PCF5001 generates call alert cadences. The first four
seconds are generated at LOW-level, a further twelve
seconds are generated at HIGH-level. Alert tone
generation and LED indication automatically terminate
after sixteen seconds unless terminated by pulsing the
status request and reset input (SR). Call alert generation
is inhibited until completion of message codeword
reception and the termination word is sent by the decoder.
Call alert generation commences after an alert delay
period, t
ALD
, at the earliest, see Fig.8. Call alert deletion is
possible during the alert delay period.
The call alert cadence is modulated according to the two
function bits (FC) in the received address codeword,
see Fig.9.
Valid calls received on RIC B or RIC D cause the alerter
frequency to be warbled by means of an additional 16 Hz
and 1024 Hz signal (respective 1365 Hz for SPF31 = 1)
as opposed to RIC A and RIC C where no alert frequency
warble takes place. Thus, eight different call cadences are
distinguishable.
ON status interrogation by the status request and reset
input (SR) the PCF5001 generates a status cadence at
LOW-level, in accordance with the present internal
decoder status (see Fig.10).
When detecting a battery-low condition the PCF5001
provides a battery-low indication. Operating in ON status
causes generation of a battery-low alert at HIGH-level for
sixteen seconds or until terminated by pulsing SR.
Operating in SILENT status or ‘repeat’ mode the
battery-low alert is stored and inhibited until switching to
ON status.
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