Philips PCD5008H Datasheet

INTEGRATED CIRCUITS

DATA SH EET

PCD5008

FLEX Pager Decoder

Product speciﬁcation Supersedes data of 1997 Oct 27 File under Integrated Circuits, IC17

1998 Jun 17

Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

CONTENTS

1 FEATURES 2 APPLICATIONS 3 GENERAL DESCRIPTION 4 QUICK REFERENCE DATA 5 ORDERING INFORMATION 6 BLOCK DIAGRAM 7 PINNING 8 FUNCTIONAL DESCRIPTION

8.1 General

8.2 Clocking, reset and start-up

8.2.1 Oscillator

8.2.2 Reset and start-up conditions

8.3 Serial peripheral interface (SPI)

8.3.1 General

8.3.2 SPI interconnect

8.3.3 SPI transfer initiated by the host

8.3.4 SPI transfer initiated by the decoder

8.3.5 SPI packet format

8.3.6 SPI timing

8.3.7 Host-to-decoder packets overview

8.3.8 Decoder-to-host packets overview

8.4 Configuration and synchronisation

8.4.1 General

8.4.2 SPI security algorithm

8.4.3 Configuration sequence

8.4.4 Configuration packet (ID = 01H)

8.4.5 Part ID packet (ID = FFH)

8.4.6 Checksum packet (ID = 00H)

8.4.7 Control packet (ID = 02H)

8.4.8 Operating the 1-minute timer

8.4.9 Status packet (ID = 7FH)

8.5 Receiver control interface

8.5.1 General

8.5.2 Low battery detection

8.5.3 Receiver settings at reset

8.5.4 Receiver off state (ID = 10H)

8.5.5 Receiver warm-up sequences

8.5.6 Active receiver states

8.5.7 Forcing receiver lines (ID = 0FH)

8.5.8 Receiver shut-down sequence

8.6 Configuration of the FLEX CAPCODE

8.6.1 General

8.6.2 CAPCODE format

8.6.3 CAPCODE ranges

8.6.4 Address calculation

8.6.5 Phase and frame calculation

8.6.6 Configuration of user addresses (ID = 78H, 80H to 8FH)

8.6.7 Configuration of assigned frames and pager collapse (ID = 20H to 27H)

8.6.8 Configuration of assigned phase

8.7 Call data packets

8.7.1 General

8.7.2 Address packet (ID = 01H)

8.7.3 Vector packets (ID = 02H to 57H)

8.7.4 Numeric vector packet

8.7.5 Short message/tone-only vector packet

8.7.6 Hex/binary, alphanumeric, secure message vectors

8.7.7 Short instruction vector

8.7.8 Message packets (ID = 03H to 57H)

8.7.9 Block Information Word (BIW) packet (ID = 00H)

8.8 Message reception

8.8.1 FLEX signal structure

8.8.2 Message building

8.8.3 All frame mode (ID = 03H)

8.8.4 Temporary addresses

8.8.5 Message fragmentation

8.8.6 Message checksums

8.8.7 Message numbering

9 LIMITING VALUES 10 DC CHARACTERISTICS 11 AC CHARACTERISTICS 12 OSCILLATOR CHARACTERISTICS 13 THERMAL CHARACTERISTICS 14 HANDLING 15 TEST AND APPLICATION INFORMATION

15.1 Example application

15.2 System block diagram

15.3 FLEX encoding and decoding rules

15.3.1 FLEX encoding rules

15.3.2 FLEX decoding rules

16 PACKAGE OUTLINE 17 SOLDERING

17.1 Introduction

17.2 Reflow soldering

17.3 Wave soldering

17.4 Repairing soldered joints

18 DEFINITIONS 19 LIFE SUPPORT APPLICATIONS

1998 Jun 17 2

Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder 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 PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

amb

EXTAL

supply voltage 1.8 2.2 3.6 V supply current see Sections 10 and 12 − 6.4 −µA operating ambient temperature −25 +25 +70 °C external clock frequency − 76.8 − kHz

5 ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

PCD5008H LQFP32 plastic low proﬁle quad ﬂat package; 32 leads; body 7 × 7 × 1.4 mm SOT358-1

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

6 BLOCK DIAGRAM

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EXTS0 EXTS1

SYMCLK

OSCPD

XTAL

EXTAL

CLKOUT

12 11

5 6

OSCILLATOR

76.8 kHz

CLOCK

RECEIVER CONTROL

SYMBOL SYNC

SYNC

CORRELATOR

DE-INTERLEAVER

ADDRESS

COMPARATOR

3, 13

NOISE

DETECTOR

INTERNAL CONTROL

UNIT

ERROR

CORRECTOR

LOCAL MESSAGE

FILTER

SPI BUFFER

PCD5008

EXTERNAL

CONTROL

UNIT

CONTROL/STATUS

REGISTERS

SPI INTERFACE

32 × 32

RAM

27 28 30 31

READY

MOSI

SCK

7, 29

MISO

4 8

24 10

25 17

MGK259

DD1

SS1

TEST2 TEST3 RESET LOBAT

TOUT0 TOUT1 TOUT2 TOUT3

, V

DD2

SS2

Fig.1 Functional block diagram for PCD5008 pager decoder.

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

7 PINNING

PAD

SYMBOL PIN I/O

TOUT0 1 O −1405/1088 3-state test output; note 2 OSCPD 2 I −1405/816 internal oscillator power-down; connected to V

DD1

3 −−1405/563 supply voltage TEST2 4 I −1405/306 manufacturing test mode input pin; has to be connected to V XTAL 5 O −1405/76 76.8 kHz crystal oscillator output EXTAL 6 I −1405/−404 76.8 kHz crystal oscillator input or external clock input V

SS1

7 −−1405/−648 ground supply TEST3 8 I −1405/−1104 manufacturing test mode input pin; has to be connected to V TOUT3 9 O −1125/−1400 3-state test output; note 2 LOBAT 10 I −863/−1400 low battery voltage detect input EXTS1 11 I −633/−1400 most signiﬁcant bit (MSB) of the symbol currently being decoded EXTS0 12 I −398/−1400 least signiﬁcant bit (LSB) of the symbol currently being decoded V

DD2

13 − 134/−1400 supply voltage SYMCLK 14 O 569/−1400 recovered symbol clock output S7 15 O 829/−1400 receiver control output port, 3-state S6 16 O 1084/−1400 receiver control output port, 3-state TOUT2 17 O 1405/−1093 3-state test output; note 2 S5 18 O 1405/−718 receiver control output port, 3-state S4 19 O 1405/−398 receiver control output port, 3-state S3 20 O 1405/−93 receiver control output port, 3-state S2 21 O 1405/202 receiver control output port, 3-state S1 22 O 1405/502 receiver control output port, 3-state S0 23 O 1405/812 receiver control output port, 3-state RESET 24 I 1405/1114 active LOW reset input TOUT1 25 O 1051/1400 3-state test output; note 2 READY 26 O 721/1400 output driven LOW when the PCD5008 is ready for an SPI packet SS 27 I 404/1400 slave select input for SPI communications SCK 28 I 149/1400 serial clock input for SPI communications V

SS2

29 −−100/1400 ground supply MOSI 30 I −516/1400 data input for SPI communications MISO 31 O −789/1400 data output for SPI communications, 3-state CLKOUT 32 O −1084/1400 38.4 kHz clock output (derived from 76.8 kHz oscillator)

COORDINATE

X/Y; note 1

DESCRIPTION

when using the

internal oscillator, connected to VDD when using an external source

Notes

1. The pad coordinates are given in µm relating to the centre of the chip and are used in case of naked die delivery.

2. These test outputs may be either left unconnected or connected to V

in the application.

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

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MISO

CLKOUT

MOSI 30

SS2

SCK 28

SS 27

READY 26

TOUT1 25

DD1

TEST2

1 2 3 4

TOUT0

OSCPD

PCD5008H

XTAL

EXTAL

SS1

TEST3

TOUT3

LOBAT

EXTS1

Fig.2 Pin configuration.

8 FUNCTIONAL DESCRIPTION

8.1 General

The PCD5008 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 PCD5008 is fully compatible with FLEXstack software which provides a complete, platform independent, software driver for the PCD5008.

The PCD5008 fully supports all non-roaming aspects of the FLEX protocol (version G1.8), and can operate in either single-phase or any-phase mode. The PCD5008 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.

RESET

22 21

TOUT2

16 S6

MGK257

EXTS0

DD2

SYMCLK

The PCD5008 connects to any receiver capable of providing a 2-bit digital signal. The PCD5008 operates the paging receiver in an efficient power consumption mode. The PCD5008 has 8 receiver control lines used for warming up, operating and shutting down a receiver in stages.

The PCD5008 has the ability to detect a battery-low signal from an external detector during the receiver control sequences.

The PCD5008 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.

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

The PCD5008 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.

The PCD5008 enables the host to operate in a low power mode when no message information for the paging device is being received. It has a 38.4 kHz clock output 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 O

SCILLATOR

The PCD5008 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.18). See Section 12 for the recommended crystal parameters and the specification of the oscillator transconductance to guarantee correct start-up.

8.2.2 R

ESET AND START-UP CONDITIONS

The PCD5008 is reset by pulling the RESET input LOW. After releasing the RESET by pulling it HIGH, the PCD5008 counts 76800 clock cycles (typically 1 second) before pulling READY LOW to indicate that the decoder is ready for configuration via the SPI.

See Fig.3 and Section 11 for the PCD5008 timing specifications when power is applied.

See Fig.4 and Section 11 for the PCD5008 timing specifications when it is reset.

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oscillator

RESET

READY

h(rst)

strt(osc)

Fig.3 Start-up timing.

WUL(osc-READY)

HL(RESET-READY)

MBK031

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FLEX Pager Decoder PCD5008

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RESET

W(rst)

READY

LH(RESET-READY)

HL(RESET-READY)

MBK033

Fig.4 Reset timing.

8.3 Serial peripheral interface (SPI)

8.3.1 G

ENERAL

All data communication between the PCD5008 and the host is done via the SPI using 32-bit data packets at data rates up to 1 Mbits/s. SPI transfers are full-duplex and can be initiated by either the host which acts as the SPI master providing the data clock for packet transfer, or the PCD5008 as an SPI slave.

The host can send packets to configure or control the PCD5008 or a checksum packet to validate SPI communication (Section 8.4.2). The PCD5008 buffers data packets, relating to received data, into a 32 packet transmit buffer. The PCD5008 can send either a status packet, a part ID packet, or packets from the transmit buffer. In the event of a buffer overflow, the PCD5008 stops decoding and clears the transmit buffer.

8.3.2 SPI

INTERCONNECT

Connection on the PCD5008 consists of a READY pin and 4 SPI pins (SS, SCK, MOSI and MISO):

READY: output signal; indicates that data is available from the PCD5008

SS: SPI select; used as PCD5008 chip select SCK: serial clock; output from the host used for clocking

data MOSI: master output slave input; data output from the

host MISO: master input slave output; data output from the

PCD5008.

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.3.3 SPI TRANSFER INITIATED BY THE HOST The following steps occur when the host initiates an SPI

packet transfer, see Fig.5 for event timings:

1. The host selects the PCD5008 by driving the SS pin LOW.

2. The PCD5008 indicates that it is ready to start the SPI transfer by driving the READY pin LOW.

3. The host clocks each of the 32 bits of the SPI packet by pulsing SCK. Both the host and the PCD5008 sample data on the rising edge of SCK. Packets are sent MSB first.

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READY

SCK

(1) (5)

(2)

(3)

(4)

4. The PCD5008 pulls the

READY line HIGH, to indicate

that the transfer is complete.

5. The host waits until the READY line is pulled HIGH, then de-selects the PCD5008 SPI by driving the SS pin HIGH.

6. The first 5 steps are repeated for each additional packet.

MOSI

MISO

Numbers within parenthesis refer to sequence numbers, see Section 8.3.3.

o(off)

D31 D1 D0

o(off)

Fig.5 Typical multiple SPI transfers initiated by the host.

8.3.4 SPI TRANSFER INITIATED BY THE DECODER The following steps occur when the PCD5008 initiates an

SPI packet transfer, see Fig.6 for event timings:

1. The PCD5008 initiates the SPI transfer by driving the READY pin LOW.

2. If the PCD5008 is not already selected, the host selects the PCD5008 SPI by driving the SS pin LOW.

D31 D1 D0

o(off)

D31 D1 D0

o(off)

MGK262

3. The host clocks each of the 32 bits of the SPI packet by pulsing SCK. Both the host and the PCD5008 sample data on the rising edge of SCK. Packets are sent MSB first.

4. The PCD5008 pulls the

READY line HIGH, to indicate

that the transfer is complete.

5. The host may then either de-select the SPI interface of the PCD5008 (Fig.7) by driving the SS pin HIGH or maintain SS LOW to continue sending packets to the PCD5008.

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FLEX Pager Decoder PCD5008

handbook, full pagewidth

Numbers within parenthesis refer to sequence numbers, see Section 8.3.4.

READY

SCK

MOSI

MISO

(2) (5)

(1)

(3)

D31 D1 D0

o(off)

D31 D1 D0

(4)

o(off)

Fig.6 Typical multiple SPI transfers initiated by the PCD5008.

D31 D1 D0

o(off)

D31 D1 D0

o(off)

MGK263

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READY

SCK

MOSI

MISO

o(off)

D31 D1 D0

Fig.7 Multiple SPI transfers initiated by the PCD5008 with SS maintained LOW.

1998 Jun 17 10

D31 D1 D0

MGK264

Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.3.5 SPI PACKET FORMAT SPI data packets consist of an 8-bit ID (byte 3), followed

by 24 bits of information (byte 2 to byte 0). See Table 1,

8.3.6 SPI TIMING

See Fig.8 and Chapter 11 for the timing specifications of the SPI.

note that bit 7 of byte 3 is the first bit on the bus.

Table 1 Packet bit assignments

BYTE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

3 D31 D30 D29 D28 D27 D26 D25 D24 2 D23 D22 D21 D20 D19 D18 D17 D16 1 D15 D14 D13 D12 D11 D10 D9 D8 0D7D6D5D4D3D2D1D0

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SSH

READY

READYH

LAG2

LAG1

LEAD1

d(SS-READY)

LEAD2

cy(SCK)

SCK

SCKL

o(off)

MISO D31 D0

ACC(o)

MOSI

su(i)(D)

SCKH

DOV

D31 D0

h(i)(D)

h(o)(D)

Fig.8 SPI timing.

o(dis)

MBK032

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.3.7 HOST-TO-DECODER PACKETS OVERVIEW This section summarises the packets which can be sent from the host to the decoder.

Table 2 Host-to-decoder packet ID map

PACKET

ID (HEX) TYPE SECTION

00 checksum 8.4.6 01 conﬁguration 8.4.4 02 control 8.4.7 03 all frame mode 8.8.3 04 to 0E reserved (host should never send) − 0F receiver line control 8.5.7 10 receiver control conﬁguration (off setting) 8.5.4 11 receiver control conﬁguration (warm-up 1 setting) 8.5.5.3 12 receiver control conﬁguration (warm-up 2 setting) 8.5.5.3 13 receiver control conﬁguration (warm-up 3 setting) 8.5.5.3 14 receiver control conﬁguration (warm-up 4 setting) 8.5.5.3 15 receiver control conﬁguration (warm-up 5 setting) 8.5.5.3 16 receiver control conﬁguration (3200 sps sync setting) 8.5.6.2 17 receiver control conﬁguration (1600 sps sync setting) 8.5.6.2 18 receiver control conﬁguration (3200 sps data setting) 8.5.6.2 19 receiver control conﬁguration (1600 sps data setting) 8.5.6.2 1A receiver control conﬁguration (shut-down 1 setting) 8.5.8.1 1B receiver control conﬁguration (shut-down 2 setting) 8.5.8.1 1C to 1F special (ignored by decoder) − 20 frame assignment (frames 112 to 127) 8.6.7 21 frame assignment (frames 96 to 111) 8.6.7 22 frame assignment (frames 80 to 95) 8.6.7 23 frame assignment (frames 64 to 79) 8.6.7 24 frame assignment (frames 48 to 63) 8.6.7 25 frame assignment (frames 32 to 47) 8.6.7 26 frame assignment (frames 16 to 31) 8.6.7 27 frame assignment (frames 0 to 15) 8.6.7 28 to 77 reserved (host should never send) − 78 user address enable 8.6.6 79 to 7F reserved (host should never send) − 80 user address assignment (user address 0) 8.6.6 81 user address assignment (user address 1) 8.6.6 82 user address assignment (user address 2) 8.6.6 83 user address assignment (user address 3) 8.6.6 84 user address assignment (user address 4) 8.6.6 85 user address assignment (user address 5) 8.6.6

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

PACKET

ID (HEX) TYPE SECTION

86 user address assignment (user address 6) 8.6.6 87 user address assignment (user address 7) 8.6.6 88 user address assignment (user address 8) 8.6.6 89 user address assignment (user address 9) 8.6.6 8A user address assignment (user address 10) 8.6.6 8B user address assignment (user address 11) 8.6.6 8C user address assignment (user address 12) 8.6.6 8D user address assignment (user address 13) 8.6.6 8E user address assignment (user address 14) 8.6.6 8F user address assignment (user address 15) 8.6.6 90 to FF reserved (host should never send) −

8.3.8 DECODER-TO-HOST PACKETS OVERVIEW This section summarises the packets which can be sent from the PCD5008 to the host (Table 3).

Table 3 Decoder-to-host packet ID map

PACKET

ID (HEX) TYPE SECTION

00 block information word 8.7.9 01 address 8.7.2 02 to 57 vector or message (ID is word number in frame) 8.7.3, 8.7.8 58 to 7E reserved − 7F status 8.4.9 80 to FE reserved − FF part ID 8.4.5

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FLEX Pager Decoder PCD5008

8.4 Conﬁguration and synchronisation

8.4.1 G

ENERAL

After a reset, all configuration data has to be (re)loaded into the PCD5008 by the host using the SPI. PCD5008 features which do not change during operation are configured using the configuration packet (Section 8.4.4), the receiver control packets (Section 8.5) and the address configuration packets (Section 8.6). PCD5008 features which can be changed during operation are configured using the control packet. The checksum packet ensures proper communication between the host and the PCD5008.

8.4.2 SPI

SECURITY ALGORITHM

The PCD5008 provides a security algorithm to verify correct SPI operation (Figs 9 and 10). The PCD5008 maintains a checksum register equal to the result of XORing the 24 data bits of every packet it receives, except the checksum packet 00H and special packets 1CH to 1FH. When the PCD5008 is reset, the internal checksum register is initialized to the 24 bit part ID defined in the part ID packet.

Immediately following a reset and whenever the host sends a packet other than a checksum packet, the SPI output of status and data (SPI transmit) is disabled. The PCD5008 then initiates SPI transfers continuously, sending the part ID packet (Section 8.4.5). Note that when

SPI transmit is disabled all decoding and timing functions are unaffected. The SPI transmit can be enabled by sending a checksum packet for which the checksum value matches the checksum register.

Any checksum packets sent when the SPI transmit is enabled, are ignored by the PCD5008 irrespective of the value of the checksum packet data bits. Thus when the PCD5008 initiates an SPI transfer and the host has no data to send, the host should send the checksum packet so as not to disable the SPI transmit. The data in the checksum packet could be a null packet (32 bit stream of all zeros).

Sending a packet other than the checksum packet when the SPI transmit is enabled causes the SPI transmit to be disabled until a checksum packet is sent with the correct value. Thus when the host re-configures the PCD5008 after a reset, the SPI transmit is disabled until the host sends a checksum packet at the end of the configuration data, with the checksum value equal to the result of XORing together the data bits of each of the configuring packets and the data bits of the part ID packet.

If the SPI transmit is enabled and there is data in the transmit buffer, the PCD5008 initiates an SPI transfer sending a packet from its transmit buffer. The PCD5008 sends the status packet (which is not buffered) when the host initiates an SPI transfer and the transmit buffer is empty.

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PART ID REGISTER

32 × 32 DATA PACKET

FIFO TRANSMIT

BUFFER

STATUS REGISTER

32 32

MUX

SPI

SECURITY

ALGORITHM

Fig.9 SPI transmit functional block diagram.

1998 Jun 17 14

SPI TRANSMIT REGISTER

MISO

MGK261

Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

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reset

PCD5008 disables

SPI transmit

PCD5008 initializes

checksum register

to part ID value

PCD5008 initiates

part ID packet

matches checksum

PCD5008 enables

PCD5008 waits for

SPI packet from host

PCD5008

SPI transmit

enabled?

packet data

SPI transmit

checksum packet?

PCD5008 disables

SPI transmit

PCD5008 sets checksum registers to the XOR of the packet

data bits with the

checksum register bits

MGK260

Fig.10 SPI security algorithm.

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.4.3 CONFIGURATION SEQUENCE A typical configuration and synchronisation sequence

would be as follows, see Fig.11 for event timings:

1. The PCD5008 is reset by the host.

2. After 1 second the PCD5008 interrupts the host to read the part ID by pulling the READY line LOW.

3. The host pulls SS LOW at the start of each SPI transfer and clocks out the part ID data.

4. The host configures the following aspects of PCD5008 operation:

a) General configuration (Section 8.4.4) b) Receiver operation (Section 8.5) c) FLEX CAPCODE configuration (Section 8.6). The PCD5008 writes a part ID packet in response to

each incoming packet.

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SPI HOST-TO-DECODER

configuration packets

(addresses, receiver etc.)

partid packet

(4)

5. At the end of each packet the PCD5008 pulls the READY line HIGH, and then LOW again to indicate that packet processing is complete.

6. The host writes a control packet to enable FLEX decoding in the PCD5008 (Section 8.4.7).

7. The host writes a checksum packet to enable SPI data output by the PCD5008 (Section 8.4.2).

8. On recognising a SYNC word, the PCD5008 synchronises to the channel.

9. The PCD5008 initiates an SPI transfer writing the status packet, indicating that it is now in synchronous mode.

control packet

(6)

checksum packet

(7)

status packet

(9)

SPI DECODER-TO-HOST

RESET

READY

FLEX DATASTREAM

Numbers within parenthesis refer to sequence numbers, see Section 8.4.3.

(1)

(5) (5) (5)

(2)

(3)

Fig.11 Typical configuration and synchronisation sequence.

partid packet

(4)

(8)

SYNC

MBK097

1998 Jun 17 16

Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.4.4 CONFIGURATION PACKET (ID = 01H) The configuration packet defines a number of different

configuration options for the PCD5008. The PCD5008 ignores this packet when decoding is enabled, i.e. the ON bit in the control packet is set (Table 11).

OFD: oscillator frequency difference (Tables 4 and 5). These bits represent the maximum frequency difference between the 76.8 kHz oscillator (accounting for ageing, temperature variation, manufacturing tolerance etc.) and the worst case transmitter bit rate (specified in FLEX as ±25 parts per million (ppm), see Section 15.3.1). For example, if the transmitter tolerance is ±25 ppm and the 76.8 kHz oscillator tolerance is ±140 ppm, the transmitter-oscillator frequency difference is ±165 ppm and OFD should be cleared (300 ppm max.). Value after reset = 0. Note that configuring a smaller frequency difference in this packet results in lower power consumption due to higher receiver battery save ratios.

SME: synchronous mode enable (Table 5). When this bit is set, a status packet is sent automatically whenever the synchronous mode update (SMU) bit in the status packet is set. This happens whenever a change occurs in the synchronous mode (SM) status bit, which indicates that the decoder is synchronized to a FLEX data stream. The host can use the SM bit in the status packet as an in-range/out-of-range indication. Value after reset = 0.

bit is set, the CLKOUT pin is driven HIGH. Note that setting and clearing this bit can cause pulses on the CLKOUT pin that are less than one half the 38.4 kHz period. Also note that when the clock output is enabled, the CLKOUT pin always outputs the 38.4 kHz signal even when the PCD5008 is in reset. Value after reset = 0.

MTE: minute timer enable (Table 5). When this bit is set, a status packet is sent at one minute intervals with the minute time-out (MT) bit in the status packet set. When this bit is clear, the internal 1-minute timer stops counting. See Section 8.4.8 for details of 1-minute timer operation. Value after reset = 0.

LBP: low battery polarity (Table 5). This bit defines the polarity of the PCD5008’s LOBAT pin: When this bit is set, a HIGH at input LOBAT represents a low battery condition. The LB bit in the status packet is initialized to the inverse (i.e. inactive) value of the LBP bit when the PCD5008 is turned on (by setting the ON bit in the control packet). When the PCD5008 is turned on, the first low battery update in the status packet is sent to the host when a low battery condition is detected on the LOBAT pin. Value after reset = 0.

SP: signal polarity (Tables 5, 6 and 7). These bits set the polarity of EXTS1 and EXTS0 input signals. The polarity of the EXTS1 and EXTS0 bits is determined by the receiver design. Value after reset = 0.

MOT: maximum off time (Table 5). When this bit is set, the PCD5008 assumes that there can be up to 1 minute between transmitted frames on the paging system. When this bit is clear, the PCD5008 assumes that there can be up to 4 minutes between transmitted frames on the paging system. This setting is determined by the service provider. Value after reset = 0.

COD: clock output disable (Table 5). When this bit is clear, a 38.4 kHz signal is output on the CLKOUT pin. When this

Table 4 Maximum oscillator frequency difference

OFD

FREQUENCY DIFFERENCE

(ppm)

00±300 01±150 10±75 11±0

Table 5 Conﬁguration packet bit assignments

BYTE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

300000001 2000000OFD 1000000SP

1SP0

OFD

0 SME MOT COD MTE LBP 0 0 0

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

Table 6 Input signal polarity

SIGNAL POLARITY

EXTS1 EXTS0

0 0 normal normal

8.4.5 PART ID PACKET (ID = FFH)

The part ID packet is output by the PCD5008 SPI whenever the SPI transmit is disabled due to the checksum feature.

MDL: model (Table 8). The PCD5008 model value is 0.

0 1 normal inverted 1 0 inverted normal 1 1 inverted inverted

CID: compatibility ID (Table 8). This value describes other parts with the same model number, which are compatible with this part. The PCD5008 compatibility value is 1. Devices which implement a superset of PCD5008

Table 7 FLEX 4 level FSK modulation selection

FSK MODULATION

EXTS1 EXTS0

AT SP = 0,0

(Hz)

functionality have MDL cleared and CID0set. REV: revision (Table 8). This identifies the manufacturing

version of the PCD5008. For the PCD5008 the value is 6. Compatible parts have values in the range 0 to 5.

1 0 +4800 1 1 +1600 01 −1600 00 −4800

8.4.6 C

See Table 9 for checksum packet bit assignment. CV: checksum value (24 bits), see Section 8.4.2.

HECKSUM PACKET (ID = 00H)

Table 8 Part ID packet bit assignments

BYTE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

311111111 2 MDL 1 CID 0 REV

MDL

CID

REV

CID

REV

CID

REV

CID

REV

CID

REV

CID CID

REV

9 1

CID CID

REV

8 0

Table 9 Checksum packet bit assignments

BYTE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

300000000 2CV23CV 1CV15CV 0CV

7CV6

22 14

CV CV

21 13

CV CV

20 12

CV CV

19 11

CV CV

18 10

CV CV

9 1

CV CV

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.4.7 CONTROL PACKET (ID = 02H) The control packet defines a number of different control

bits for the PCD5008. FF: force frame 0 to 7 (Table 11). When set, each of these

bits forces the PCD5008 to decode one of the FLEX frames 0 to 7 irrespective of the system collapse value (for details of collapse values see Section 8.6.2). For example, if the system collapse causes the PCD5008 to decode frames 0, 32, 64 and 96, setting FF2 causes the PCD5008 to also decode FLEX frame 2. This may be used to acquire transmitted time information. Value after reset = 0.

SPM: single phase mode (Table 11). When this bit is set, the PCD5008 decodes only one of the transmitted phases. When this bit is clear, the PCD5008 decodes all transmitted phases. This value is determined by the CAPCODE (Section 8.6). A change to this bit while the PCD5008 is on does not take effect until the next block 0 of a frame. Value after reset = 0.

PS: phase select (Tables 10 and 11). When the SPM bit is set, these bits define which phase the PCD5008 shall decode. This value is determined by the CAPCODE (Section 8.6). A change to these bits, while the PCD5008 is on, does not take effect until the next block 0 of a frame. Value after reset = 0.

Table 10 Phase selection (PS bits)

DECODED PHASE (BASED ON

FLEX DATA RATE)

1600 bits/s 3200 bits/s 6400 bits/s

00AAA 01AAB 10 A C C 11 A C D

SBI: send block information words (BIW) 2 to 4 (Table 11). When this bit is set, BIWs with time and date information and BIWs received in error are sent to the host, (Section 8.7.9). Value after reset = 0.

MTC: minute timer clear (Table 11). Setting this bit causes the 1-minute timer to restart from 0 (Section 8.4.8).

ON: turn on decoder (Table 11). When this bit is set, the PCD5008 decodes FLEX signals. If this bit is cleared, signal processing stops. However, to assure proper operation, the PCD5008 requires that it be set into asynchronous mode when turned off. To achieve that the following sequence must be used:

1. Send control packet with ON bit clear (decoder off)

2. Send control packet with ON bit set (decoder on)

3. Send control packet with ON bit clear (decoder off).

Timing between these steps is specified below and is measured from the positive edge of the last clock of one packet to the positive edge of the last clock of the next packet.

• The minimum time between steps 1 and 2 is the greater

of 2 ms or the programmed shut-down time. The programmed shut-down time is the sum of all of the times programmed in the used receiver shut-down settings packets.

• There is no maximum time between steps 1 and 2

• The minimum time between steps 2 and 3 is 2 ms

• The maximum time between steps 2 and 3 is the

programmed warm-up time minus 2 ms. The programmed warm-up time is the sum of all the times programmed in the used receiver warm-up settings packets.

8.4.8 O

PERATING THE 1-MINUTE TIMER

The PCD5008 provides a 1-minute timer which allows the host to implement a time-of-day function while maintaining low-power operation. The 1-minute timer is enabled using the MTE bit in the configuration packet (Section 8.4.4). When the 1-minute timer is enabled, a status packet is sent at 1-minute intervals with the MT bit set (Section 8.4.9). When the MTE bit is clear, the internal 1-minute timer stops counting. When the host sends a control packet with MTC bit set, the 1-minute timer restarts from 0. This allows accurate setting of a time-of-day function.

Table 11 Control packet bit assignments

BYTE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

300000010 2FF

7FF6

1 0 SPM PS

5 1

4 0

0000

0 0 SBI 0 MTC 0 0 0 ON

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Philips Semiconductors Product speciﬁcation

FLEX Pager Decoder PCD5008

8.4.9 STATUS PACKET (ID = 7FH) The status packet contains various types of information

that the host may require and is sent to the host:

• Whenever the PCD5008 is polled and has no other data to send

• On events for which the PCD5008 is configured to send the status packet (Sections 8.4.4 and 8.4.7). In this case, the PCD5008 prompts the host to read a status packet for the following conditions:

– SMU bit in the status packet and the SME bit in the

configuration packet are set

– MT bit in the status packet and the MTE bit in the

configuration packet are set – EOF bit in the status packet is set – LBU bit in the status packet is set – BOE bit in the status packet is set.

FIV: frame information valid (Table 12). This bit is set, when a valid frame information word has been received since becoming synchronous to the system and the f and c fields contain valid values. If this bit is clear, no valid frame information words have been received since the PCD5008 became synchronous to the system. This value changes from 0 to 1 at the end of block 0 (Fig.17) of the frame in which the first frame information word was properly received. It is cleared when the PCD5008 goes into asynchronous mode (see SM bit below). This bit is initialized to 0 when the PCD5008 is reset and when the PCD5008 is turned off by clearing the ON bit in the control packet.

f: current frame number (Table 12). This value is updated every frame regardless of whether the PCD5008 needs to decode the frame. This value changes to its proper value for a frame at the end of block 0 of the frame. The value of these bits is not guaranteed when FIV is 0.

c: current system cycle number (Table 12). This value is updated every frame regardless of whether the PCD5008 needs to decode the frame. This value changes to its proper value for a frame at the end of block 0 of the frame. The value of these bits is not guaranteed when FIV is 0.

SM: synchronous mode (Table 12). This bit is set, when the PCD5008 is synchronous to the system. The PCD5008 sets this bit when the first synchronization words are received. It clears this bit when synchronisation to the FLEX signal is lost. This bit is initialized to 0 when the PCD5008 is reset and when it is turned off by clearing the ON bit in the control packet.

SMU: synchronous mode update (Table 12). This bit is set if the SM bit has been updated in this packet. After the PCD5008 has been turned on, this bit is set when the first synchronization words are found (SM changes to 1) or when the first synchronization search period (meaning the receiver is active during this time) expires (SM stays 0), after the PCD5008 is turned on. The latter condition gives the host the option of assuming the paging device is in range when it is turned on, and displaying out-of-range only after the initial search period expires. After the initial synchronous mode update, the SMU bit is set whenever the PCD5008 switches from/to synchronous mode. The bit is cleared when read. Changes in the SM bit due to turning off the PCD5008 does not set the SMU bit. This bit is initialized to 0 when the PCD5008 is reset.

LB: low battery (Table 12). Set to the value last read from the LOBAT pin. The host controls when the LOBAT pin is read via the receiver control packets. This bit is initialized to 0 at reset. It is also initialized to the inverse of the LBP bit in the configuration packet, when the PCD5008 is turned on, by setting the ON bit in the control packet.

LBU: low battery update (Table 12). This bit is set if the value on two consecutive reads of the LOBAT pin yielded different results. The bit is cleared when read. The host controls when the LOBAT pin is read via the receiver control packets. Changes in the LB bit due to turning on the PCD5008 do not cause the LBU bit to be set. This bit is initialized to 0 when the PCD5008 is reset.

MT: minute time-out (Table 12). Set if one minute has elapsed. The bit is cleared when read. This bit is initialized to 0 when the PCD5008 is reset.

EOF: end of frame (Table 12). Set when the PCD5008 is in all frame mode (AFM) (Section 8.8.3), and the end of the frame has been reached. The PCD5008 is in the AFM if the AFM enable counter is non-zero, if any temporary address enabled (TAE) counter is non-zero (Section 8.8.3) or if the FAF bit in the AFM packet is set. The bit is cleared when read and initialized to 0 when the PCD5008 is reset.

BOE: buffer overflow error (Table 12). Set when information has been lost owing to slow host response time. When the PCD5008 detects that its SPI transmit buffer has overflowed, it clears the transmit buffer, turns off decoding by clearing the ON bit in the control packet, and sets this bit. The bit is cleared when read. This bit is initialized to 0 when the PCD5008 is reset.

x: unused bits (Table 12). The value of these bits is not guaranteed.

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Philips PCD5008H Datasheet

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