Philips Semiconductors
FLEX™ Pager Decoder
Product specification
PCD5008
1 FEATURES
• FLEX™ paging protocol signal processor
• 16 programmable user address words
• 16 fixed temporary addresses
• 1600, 3200 and 6400 bits/s decoding
• Any-phase or single-phase decoding
• Uses standard serial peripheral interface (SPI) in slave
mode
• Allows low current power-down mode operation of host
processor
• Highly programmable receiver control
• Real-time clock time base
• FLEX™ fragmentation and group messaging support
• Real-time clock over-the-air update support
• Compatible with synthesized receivers
• Low battery indication (external detector)
• Low cost LQFP32 plastic package
• Operates using a 76.8 kHz crystal
• Very low power consumption
• Operates at low supply voltage.
3 GENERAL DESCRIPTION
This data sheet describes the operation of the PCD5008
integrated paging decoder. It is fully compatible with the
Motorola FLEXchip™ IC.
The PCD5008, also referred to as the decoder, simplifies
implementation of a FLEX™ paging device, by being able
to interface with several off-the-shelf paging receivers and
host microcontrollers/processors. Its primary function is to
process information received and demodulated from a
FLEX™ radio paging channel, select messages addressed
to the paging device and communicate the message
information to the host.
Motorola FLEXstack™ software, installed on the product
host processor, communicates with the PCD5008 and
interprets the codewords that are passed to the host.
The PCD5008 operates the paging receiver in an efficient
power consumption mode and enables the host to operate
in a low-power mode when no message is being received.
2 APPLICATIONS
• Numeric FLEX™ pagers
• Alphanumeric FLEX™ pagers
• Remote metering
• Car security systems
• Personal digital assistants.
4 QUICK REFERENCE DATA
SYMBOL
VDD
IDD
Tamb
fEXTAL
PARAMETER
supply voltage
supply current
operating ambient temperature
external clock frequency
CONDITIONS
see Sections 10 and 12
MIN. TYP. MAX. UNIT
1.8 2.2 3.6 V
−
6.4 −
µA
−25 +25 +70 °C
−
76.8 −
kHz
5 ORDERING INFORMATION
TYPE
NUMBER
PCD5008H
PACKAGE
NAME
DESCRIPTION
LQFP32 plastic low profile quad flat package; 32 leads; body 7 × 7 × 1.4 mm
VERSION
SOT358-1
1998 Jun 17
3