參數(shù)資料
型號(hào)： PCF5001T
廠商： NXP SEMICONDUCTORS
元件分類： 尋呼電路
英文描述： POCSAG Paging Decoder
中文描述： TELECOM, PAGING DECODER, PDSO28
封裝： 7.50 MM, PLASTIC, MS-013AE, SOT-136-1, SOP-28
文件頁(yè)數(shù)： 17/44頁(yè)
文件大?。?/td> 273K
代理商： PCF5001T
1997 Mar 04
17
Philips Semiconductors
Product specification
POCSAG Paging Decoder
PCF5001
The LED output can be made to provide message data by
programming SPF17. Alert signals are inhibited during
message data transfer.
7.10
Vibrator output
The PCF5001 provides the OM output for activating a
vibrator-type alerter for call alert indication. The vibrator
output is enabled by programming of SPF11.
Calls received while operating in SILENT status cause
activation of the vibrator output for the normal call alert
cadence or until terminated by operation of the status
request and reset input (SR). SILENT override calls, calls
received in decoder ON status and repeated call alerts are
alerted normally by the AL and AH outputs.
7.11
Start-up alert
To indicate the establishment of operational condition
whenever the decoder status has been changed from OFF
to ON or SILENT status, the PCF5001 provides a start-up
alert indication. Switching from OFF to ON status causes
generation of a start-up alert cadence at LOW-level and on
the LED output OL (see Fig.13).
Fig.11 Repeat alert cadence.
MCD462
AL
AH
OL
tRCR
tRPT
Fig.12 Out-of-range indication.
MCD463
t
tORA
ORD
When changing from OFF to SILENT status, the start-up
alert will be indicated on the LED output and the vibrator
output OM.
7.12
Serial communication interface
To transmit any call message data received to an external
microcontroller for post-processing, a serial
communication interface has been provided by a serial
data output signal DO and a data strobe signal DS as
shown in Fig.14.
Upon interrogation the PCF5001 is also able to transfer
EEPROM contents via the serial communication interface,
see Section 7.21.
7.13
Message data transfer
The transfer of message data via DO and DS is organized
in 8-bit words providing additional start and stop conditions
as shown in Fig.15.
On reception of a valid call address the PCF5001
generates a start condition and outputs an address word
as shown in Fig.15a.
The address word indicates call address, function bit
setting and decoder flags as shown in Table 4.
Message codewords received and concatenated to a valid
call address are transferred after completion of the
address word. The message bits received in the message
codewords are split into blocks and are converted to obtain
the message words. The message words comprise an
error flag to indicate message words, which are derived
from uncorrectable message codewords as shown in
Table 5.
Message data is output at a rate of 2048 bits/s with a
minimum delay of 2 bits between consecutive message
words.
Fig.13 Start-up alert.
MCD464
AL
OL
OM
tSUA
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