PCF5001 datasheet(8/44 Pages) PHILIPS

8 / 44 page

1997 Mar 04

Philips Semiconductors

Product speciﬁcation

POCSAG Paging Decoder

PCF5001

Battery-low indication output. If the decoder encounters a battery-low

condition a battery-low output latch is set HIGH. The battery-low output

latch may be tested for a battery-low condition, whenever the interface

enable input (IE) is active (HIGH), otherwise the battery-low output is

made high-impedance. The battery-low output latch is reset only, by

switching the decoder to OFF status.

Out-of-range indication output. Whenever the decoder detects an

out-of-range condition an out-of-range output latch is set HIGH after expiry

of the programmed out-of-range hold-off time selected by means of

special programming (SPF06 and SPF07) of the EEPROM. The

out-of-range latch may be tested for an out-of-range condition, whenever

the interface enable input (IE) is active (HIGH), otherwise the out-of-range

output is made high-impedance. The out-of- range output is reset by

detection of a valid data transmission or by switching the decoder to OFF

status.

Serial interface data output. During normal decoder operation, accepted

calls and possibly subsequent message data are serially output via this pin

in conjunction with the data strobe output (DS). This pin is also used to

output the EEPROM contents upon special command, if the decoder is

programmed for display pager.

Serial interface data strobe output. Provides a clock signal for the received

call data and EEPROM data appearing at the data output (DO). Each time

this output is LOW the data at DO is valid. Additional start and stop

conditions allow easy identiﬁcation of data sequence start and end.

Frequency reference output. When programmed for ‘display pager’ mode,

this output provides a clock reference with 16384 or 32768 Hz per

second, selected by SPF32. See Chapter 7.

n.c.

−

2, 7, 20, 21

Not connected.

SYMBOL

DESCRIPTION

PCF5001T

(SOT136-1)

PCF5001H

(SOT358-1)

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