PCD5013H/F1 데이터 시트보기 (PDF) - Philips Electronics

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PCD5013H/F1

FLEX™roaming decoder II

Philips Electronics 

Philips Semiconductors

FLEX™ roaming decoder II

Product specification

PCD5013

8 FUNCTIONAL DESCRIPTION

8.1 General

The PCD5013 simplifies implementation of a FLEX™

paging device by interfacing with off-the-shelf components

such as a paging receiver and a microcontroller or

microprocessor (called a host). The PCD5013 is fully

compatible with FLEXstack™ software which provides a

complete, platform independent, software driver for the

PCD5013.

The PCD5013 fully supports all aspects of the FLEX™

protocol (version G1.9), and can operate in either

single-phase or any-phase mode. The PCD5013 supports

FLEX™ dynamic grouping, allowing up to 16 temporary

addresses to be enabled simultaneously. It is also capable

of retrieving real time information from a FLEX™ channel.

The PCD5013 connects to any receiver capable of

providing a 2-bit digital signal. The PCD5013 operates the

paging receiver in an efficient power consumption mode.

The PCD5013 has 8 receiver control lines used for

warming up, operating and shutting down a receiver in

stages.

The PCD5013 has the ability to detect a battery-low signal

from an external detector during the receiver control

sequences.

The PCD5013 carries out the following functions:

• Synchronises to a FLEX™ data stream

• Processes received, demodulated information

• Performs de-interleaving and error correction

• Selects calls addressed to the paging device using up to

16 programmable addresses

• Communicates the message information to the host.

The PCD5013 interfaces to a host through a serial

peripheral interface (SPI). The host can then interpret the

message information in an appropriate manner (numeric,

alphanumeric, binary, etc.). This function is provided by

the FLEXstack™ software.

When configured to use the internal demodulator, the

PCD5013 connects to a receiver capable of generating a

limited (i.e. 1-bit digitized) 455 or 140 kHz IF signal

(IF frequency automatically detected).

The PCD5013 enables the host to operate in a low-power

mode when monitoring a single channel for message

information. It has a 38.4 kHz clock output (40 kHz

available when using the internal demodulator) capable of

driving other devices, and has a 1-minute timer that offers

low-power support for a real-time clock function on the

host.The host can use receiver control lines which are not

required by the receiver as expansion ports to control other

peripheral devices.

8.2 Clocking, reset and start-up

8.2.1 OSCILLATOR

The PCD5013 uses an inverting crystal oscillator.

The clock signal for the internal circuitry is derived via an

amplifier from the oscillator input pin EXTAL. Alternatively,

an external clock signal can be fed in at input pin EXTAL.

In this case the internal oscillator can be disabled by

pulling the OSCPD input pin HIGH. This reduces current

consumption and routes EXTAL directly to the internal

clock signal. When using a crystal, an external feedback

resistor and the load capacitances need to be connected

to pins EXTAL and XTAL (Fig.19). See Chapter 14 for the

recommended crystal parameters and the specification of

the oscillator transconductance to guarantee correct

start-up.

The PCD5013 oscillator can operate at either 76.8 kHz or

160 kHz by selecting the appropriate crystal. The choice of

frequency is determined by the setting of the IDE bit in the

configuration packet; see Section 8.4.4.

8.2.2 RESET AND START-UP CONDITIONS

The PCD5013 is reset by pulling the RESET input LOW.

After releasing the RESET by pulling it HIGH, the

PCD5013 counts 76 800 clock cycles (independent of the

oscillator frequency) before pulling READY LOW to

indicate that the decoder is ready for configuration via

the SPI.

See Fig.3 and Chapter 13 for the PCD5013 timing

specifications when power is applied.

See Fig.4 and Chapter 13 for the PCD5013 timing

specifications when it is reset.

After switch-on, the PCD5013 operates in Asynchronous

mode, periodically sampling the channel for incoming

data. As soon as data is detected, the PCD5013 maintains

the receiver on to synchronize to the channel. Once the

pager is synchronized to the channel it enters

Synchronous mode, switching the receiver on only for the

programmed frames.

When the receiver is programmed for Roaming operation,

the PCD5013 sends information which allows the host to

calculate when to switch frequencies in a roaming

network.

1999 Apr 12

7

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