VTech Telecommunications 80-4258-05 SPP-ID970 Cordless Telephone User Manual PDL MK3 Theory of Operation

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PDL MK3 Theory of Operation

1. RF Module Theory of Operation
2. PDL MK3 Theory of Operation

PDL MK3 Theory of Operation

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 3 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.Table of Contents1 Complete System Description................................................ 51.1 Introduction............................................................................................ 51.2 Feature List............................................................................................. 51.3 System Block Diagram........................................................................... 61.4 Handset Block Diagram.......................................................................... 71.5 Base Block Diagram ............................................................................... 82 RF Section Overview............................................................... 92.1 Introduction............................................................................................ 92.2 Frequency Tables................................................................................... 102.2.1 Handset Frequencies.................................................................................................. 102.2.2 Base Frequencies....................................................................................................... 112.3 Block Diagram........................................................................................ 123 RF Section Detailed Operation............................................... 133.1 Antenna Section..................................................................................... 133.1.1 Antenna...................................................................................................................... 133.1.2 SAW Duplexer ............................................................................................................ 133.2 Receive Section...................................................................................... 133.2.1 RX Amps and SAW Filter ............................................................................................ 133.2.2 RX Mixer..................................................................................................................... 143.2.3 RX VCO and LO Buffer............................................................................................... 143.2.4 RX Synthesizer........................................................................................................... 153.2.5 IF Amplifier Stage....................................................................................................... 153.2.6 IF Filtering.................................................................................................................. 153.2.7 Mixer, IF Amplifier, FM Demodulator (Temic IC).......................................................... 153.3 Transmit Section .................................................................................... 163.3.1 TX Amp....................................................................................................................... 163.3.2 TX VCO ...................................................................................................................... 163.3.3 TX Synthesizer/PLL.................................................................................................... 16

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 4 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.4 Baseband Section ................................................................... 174.1 General Description ............................................................................... 174.2 Detailed Functional Description ............................................................ 184.2.1 Protocol Functions..................................................................................................... 184.2.2 Audio Functions ......................................................................................................... 184.2.3 System Control Functions.......................................................................................... 184.3 Port Pin Assignment And Functions..................................................... 204.3.1 Handset Port Pin Assignment..................................................................................... 204.3.2 Base Port Pin Assignment.......................................................................................... 21

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 5 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.1 Complete System Description1.1 IntroductionThis theory of operation covers the basic single line SPP-ID970/1 in the PDL MK3 series. based on thethird generation 900 MHz ADPCM core.1.2 Feature List• Name / number caller ID display with 50 call storage capacity• 32kbps ADPCM voice coding• 2 row by 16 character 5x7 dot matrix alpha-numeric with 7 segment Digits and ICONS on the LCDdisplay on handset• 30 channel operation with auto channel selection• 900 MHz Operation• 24 bit digital security code for 16.8 million combinations• DTMF and Pulse dialing• 50 name/number/location programmable memory for up to 32 max digit phone number• Automatic search for best available channel• Low battery detect and warning indicator• Handset power saving 7 days (less during out-of-range) 1• 7.0 Hours continuous talk time 1• Volume adjust on handset• Hearing-aid compatible receiver• Backlit LCD on the handset• Auto hang-up when returning the handset to the base cradle.• Detachable power supply• Jog Dial for menu navigation• Use of E2PROM in base unit for permanent memory storage of security code• Use of E2PROM in the handset for nonvolatile storage of the security code, CID messages andspeed dial numbers• Handset allows for on-the-fly battery replacement• Fully digital link between handset and base• Digitally-scrambled voice communication between handset and base has extremely high immunity tonoise and interfering signals• Out-of-range indication while the handset is in use and in standby mode• Removable battery pack• A faster charge (.2C) capability will be provided on the base for the handset battery. The unit willautomatically switch over to regular trickle charge (.1C) when required.• The electrical design will support charging in the face up position.1 Note that this is only when masked ROM is used. Use of external ROM will diminish the talk/standbytime.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 6 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.1.3 System Block DiagramFigure 1.2 System Block DiagramCORDLESS HANDSETBASE UNIT (with internal antenna)AC ADAPTOR115 VACTELEPHONE LINE2-way RF Voice/Data Link9 VDC

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 7 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.1.4 Handset Block DiagramFigure 1.3 Handset Block DiagramBASEBANDASICRF TRANSCEIVERKEYPADAntennaTx DataRx DataTest Serial I/FE2PROMMEMORYBATTERYLCDDISPLAYReceiverAudio In MicAudio OutChargeContactsSerial BusAlerterJOG DIAL

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 8 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.1.5 Base Block DiagramFigure 1.4 Base Block DiagramBASEBANDASICRF TRANSCEIVERE2PROMMEMORYSPAREBATTERYAntennaSerial BusTx DataRx DataTest Serial I/FTELEPHONELINEINTERFACERx AudioTx Audio Tel LineACADAPTOR115 VACBATTERYCHARGERCradle ChargeContactsLEDDISPLAYCIDFSKSignalsRSSICIDAMPVOLT REGRegCtrl

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 9 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.2 RF Section Overview2.1 IntroductionThe basic function of the base and handset RF sections is to provide a full duplex wireless link between thehandset and base sections of the telephone. This is accomplished by setting up two simultaneouscommunications links between the handset and base RF boards. The RF receiver and transmitter circuitryessentially provide a link between the microphone and receiver in the handset to the telephone line in thebase set. In this way the phone performs exactly as a corded phone, except without the cord.The frequency at which the handset transmits to the base is centered around 926.55 MHz, and thefrequency at which the base transmits to the handset is centered around 903.8 MHz. The data rate whichis modulated onto the RF carrier is 48 kbps. On the receiver side, the data is extracted and thenconverted back into the original audio signal.It is important to note that the synthesizer / pre-scaler IC only operates up to 500 MHz. The VCO'stherefore oscillate at roughly 450 MHz. The 900 MHz signals needed for the transmit and receive sectionsare generated from the second harmonic of the VCO frequencies.The following section will outline the transmit frequencies used as well as the corresponding LO frequencywhich is used for the receiver. This is followed by the Block diagram and a block by block functionaldescription of the modules.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 10 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.2.2 Frequency TablesThis section outlines the RF frequencies and corresponding channel numbers. The handset uses a highside LO while the base uses a low side LO to down-convert the incoming signal.2.2.1 Handset FrequenciesPlease refer to the new Handset Freq. table shown in file “MK3_68_RF_OP.doc”Channel Transmit Receive RX LO1925.05 902.3 9132925.2 902.45 913.153925.35 902.6 913.34925.5 902.75 913.455925.65 902.9 913.66925.8 903.05 913.757925.95 903.2 913.98926.1 903.35 914.059926.25 903.5 914.210 926.4 903.65 914.3511 926.55 903.8 914.512 926.7 903.95 914.6513 926.85 904.1 914.814 927 904.25 914.9515 927.15 904.4 915.116 927.3 904.55 915.2517 927.45 904.7 915.418 927.6 904.85 915.5519 927.75 905 915.720 923.1 904.85 915.5521 923.25 905 915.722 923.4 905.15 915.8523 923.55 905.3 91624 923.7 905.45 916.1525 923.85 905.6 916.326 924 905.75 916.4527 924.15 905.9 916.628 924.3 906.05 916.7529 924.45 906.2 916.930 924.6 906.35 917.05

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 11 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.2.2.2 Base FrequenciesChannel Transmit Receive RX LO1 902.3 925.05 914.352 902.45 925.2 914.53 902.6 925.35 914.654 902.75 925.5 914.85 902.9 925.65 914.956 903.05 925.8 915.17 903.2 925.95 915.258 903.35 926.1 915.49 903.5 926.25 915.5510 903.65 926.4 915.711 903.8 926.55 915.8512 903.95 926.7 91613 904.1 926.85 916.1514 904.25 927 916.315 904.4 927.15 916.4516 904.55 927.3 916.617 904.7 927.45 916.7518 904.85 927.6 916.919 905 927.75 917.0520 905.15 923.1 912.421 905.3 923.25 912.5522 905.45 923.4 912.723 905.6 923.55 912.8524 905.75 923.7 91325 905.9 923.85 913.1526 906.05 924 913.327 906.2 924.15 913.4528 906.35 924.3 913.629 906.5 924.45 913.7530 906.65 924.6 913.9

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 12 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.2.3 Block DiagramBoth the handset and base RF sections follow the same block diagram shown below with only minorchanges to incorporate the different transmit and receive frequencies.SAWFILTERSYNTHESIZER18.25 MHzREFERENCE3 LINE DATA BUSRX L.O.DUALPRESCALER/457MHzFinFin V-tuneV-Tune2nd RXAMP(Base only)IF AMP,MIXERDEMOD1st RXAMPTX O/PAMPTEMIC U2765BTX DataSAW DUPLEXERRXAudio10.7 MHzCeramicsRSSIFigure 2.3 RF Section Block DiagramAs can be seen by the block diagram, there are several important input/output signals which are necessaryfor operation of the RF section (this does not include the separate supply lines for both TX and RXsections). An 18.25 MHz reference is present for use in the frequency synthesizers. The accuracy of this18.25 MHz input will affect the transmit and receive frequencies. In order to ensure proper operation ofthe RF sections, the 18.25 MHz reference signal must be at least 500 mV in amplitude. Also present is the3-line serial synchronous data bus on which data is transferred to the synthesizers to set both the transmitand receive frequencies.In the transmit direction, modulation input allows digital data to be modulated directly onto the TX carrier.In the receive direction, the RF section performs a single down-conversion of the incoming RF signal to10.7 MHz where it is demodulated and sent to the AMD ASIC. The Data output is the demodulated signalwhich is sent to the ASIC to be filtered and shaped by an internal data slicer. The reconstructed datarepresents the original voice which is can then be processed by the DSP in the ASIC..The following section explains the individual blocks in the RF section in detail. All reference to partnumbers correspond to the handset schematic.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 13 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.3 RF Section Detailed Operation3.1 Antenna Section3.1.1 AntennaThe antenna is a device which allows effective conversion of energy from air to the RF circuitry. Theantennas used are a retractable 1/2 wave with 2.5 dB gain relative to an isotropic radiator and a fixed 1/4wave antenna with roughly 0 dB gain relative to an isotropic radiator. The duplexer and filters which followthe antenna, require a 50 ohm match to operate properly. The antenna is roughly matched to 50 ohms andrequires a simple microstrip matching network to achieve this. If a network analyzer is attached to theBFA connector after disconnecting the duplexer, the antenna match may be measured. In order to achievea good 50 ohm match, one must be careful not to obstruct the antenna as any object near the antenna willaffect its impedance.3.1.2 SAW DuplexerThe SAW Duplexer consists of two bandpass filters to provide the necessary isolation between transmitand receive sections and to pass the correct frequencies to transmit and receive sections. To ensure thatthe Duplexer is operating correctly, the match looking into the filters from the BFA connector may bemeasured. To do this it is necessary to remove the 0 ohm resistor which connects the antenna to theDuplexer. A return loss of approximately 15 dB should be measured for both the TX and RX bands.3.2 Receive Section3.2.1 RX Amps and SAW FilterThe purpose of the first RX amp is to provide enough gain that the noise figure of the RX section is fixed toas low a value as possible. It must provide a good 50 Ω match to both the RX bandpass filter and theSAW filter. This amplifier must also have good power handling capability due to the limited filtering whichprecedes it. The design employs a collector inductor to improve the output power capability of thetransistor. This form of matching also ensures that the gain of this stage is not too wide band furtherimproving its performance by allowing it to effectively reject signals which are far out of its passband.Directly following the first RX amp is the SAW filter. This filter is responsible for the bulk of the filtering inthe receive section. It provides more than 40dB of image rejection and TX carrier suppression. Theinsertion loss of this filter is relatively high due to its SAW implementation. It has an insertion loss of lessthan 5 dB, typically 4 dB. An amplifier is required before this SAW filter to keep the noise figure low. If itwere not present, the noise figure of the phone would increase by the 4 dB loss associated with the SAWfilter.The second RX amp provides a limited amount of gain. Its main function is to ensure that the mixer sees agood wideband match. Measuring the RX gain from the BFA connector to the output of this amplifier willproduce results as shown in Figure 4 below.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 14 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.0 dB10 dB/div875 975925-928MHz Passband902-905MHz Reject BandFigure 3.2.1 RX Front End Response3.2.2 RX MixerThe function of the mixer is to combine the incoming signal with a LO signal in order to convert the desiredsignal to the 10.7 MHz IF frequency. The mixer used for this task is a dual gate FET (NEC 25139). TheLO and RF signals are placed on the gates of the FET and the IF signal is coupled off of the drain. TheFET provides conversion gain along with adequate power handling characteristics. Both the RF and LOports are shorted to ground by spiral microstrip inductors on base unit and, spiral microstrip and SMTinductors on the handset. These inductors provide a high impedance at both the RF and LO frequencieswhile presenting a very low impedance at the IF frequency. The mixer is followed by an emitter followerwhich converts the high impedance output of the mixer to a 330 ohm output suitable for directly driving theIF ceramic filters. The gain for the pair (mixer and follower) is about 4 dB (50 ohms in, 330 ohms out).3.2.3 RX VCO and LO BufferThe RX VCO is a Colpitt's type oscillator operating at about 450 MHz with a frequency selective networktuned to about 900 MHz on the collector. The frequency of oscillation is controlled by a varactor diode inthe tank circuit connected to the base of the transistor. This diode is connected to the loop voltage fromthe RX synthesizer. Rough tuning is achieved with a variable chip cap. This capacitor is used to center thetuning voltage to ensure reliable operation over a wide temperature range and also to compensate forvariances in component values.The 450 MHz LO for the PLL is coupled off of the emitter of the VCO transistor. This is lightly coupled toensure that the VCO is not loaded by the PLL. The 900 MHz RX LO signal for the Mixer is coupled off thecollector of the VCO transistor.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 15 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.3.2.4 RX SynthesizerThe PLL and prescaler for both the TX and RX sides are now combined into one IC. The Synthesizerreceives channel information from the embedded microprocessor in the AMD ASIC via the serial buss. Italso requires a stable 18.25 MHz reference which is also supplied from the AMD ASIC.A passive loop filter is employed to connect the synthesizer to the VCO. This tuning voltage may beobserved from test point RX_LOOP_V on the bottom side of the PCB. The loop filter cutoff frequency isset to about 1 kHz to allow relatively fast power-up times.3.2.5 IF Amplifier StageThere is only one stage of discrete IF amplification. Transistor Q8 on the base (Q5 on handset) is used asan amplifier with 330 ohms input and output impedance. The rest of the IF gain is provided by the FMdemod IC discussed below.3.2.6 IF FilteringThe choice of 10.7 MHz as an IF frequency, allows the use of relatively inexpensive filters. Two ceramicfilters are used to achieve the desired adjacent channel suppression. Two different bandwidth filters areused, 230 kHz and 150 kHz, so that any shifting in the passband does not narrow the bandwidthexcessively.3.2.7 Mixer, IF Amplifier, FM Demodulator (Temic IC)The RF design uses an integrated solution that provides a number of different receiver functions on a singlesilicon chip. The Temic U2765B IC combines a, mixer down-converter, IF amplifier and FM demodulatoronto one device.3.2.7.1 Rx MixerThe function of the mixer is to combine the incoming signal with a LO signal in order to convert the desiredsignal to the 10.7 MHz intermediate frequency (IF). The LO and RF signals are coupled onto pins 26 and3 respectively on the Temic IC. The mixer output is coupled off of the Temic IC by a 10.7 MHz transformerto a 10.7 MHz ceramic IF filter before it is injected into limiter 1 within the Temic IC. The output of limiter 1is coupled off of the Temic IC into another 10.7 MHz ceramic IF filter.3.2.7.2 IF Amplifier StageThere is a two-stage limiting amplifier integrated with the Temic IC. Both of the limiters require external10.7 MHz ceramic IF filters.3.2.7.3 DemodulatorThe quadrature circuit is made up one inductor, one resistor, and two capacitors. One of the twocapacitors is a variable capacitor that allows tuning of the circuit. The quadrature voltage may beobserved at the ATE test point connector. This voltage should nominally be 1.2 V for both the base andhandset when a signal is centre tuned.The recovered audio signal from the demodulator has a peak-to-peak amplitude of approximately 0.31 V(for 50 kHz peak-to-peak modulation). One path from the recovered audio port is filtered through a low-pass data filter and passed back into the baseband module.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 16 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.3.2.7.4 RSSI ComparatorThe U2765B provides an RSSI voltage that is proportional to the input signal level that is then sent to theASIC A/D pin.3.3 Transmit Section3.3.1 TX AmpThere is one transistor which provide the necessary gain for the transmit section. Transistor Q1 amplifiesthe signal from the TX VCO. The output power is set such that we guarantee less then 50mV/meterradiated field strength measured at 3 meters.3.3.2 TX VCOThe basic operation of the TX VCO is the same as the RX VCO, except for one detail. The TX VCO isalso FSK modulated by the transmit data through a second varactor in the tank (25kHz peak to peak). Thedata is first filtered and then the amplitude is set via a precision resistor divider (R119/R120 on handsetand R27/R179 on base) to set the deviation of the data modulation.3.3.3 TX Synthesizer/PLLThe TX PLL is combined into one IC with the RX PLL. See above. The loop filter cutoff frequency isabout 100 Hz. This allows the data modulation to include frequencies down to about 100 Hz. The power-up time of the TX PLL is not critical.

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 17 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.4 Baseband Section4.1 General DescriptionThe AMD 79C493 ASIC is a custom designed IC, which consists of a VTech proprietary FDD protocolblock plus a unique baseband architectureThe AMD ASIC performs virtually all the non-RF functions. The base and handset ASIC’s are identical withthe exception of the ROM code which will be masked into the ASIC prior to mass production.Figure 4.1 ASIC - Internal Structure Diagram

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 18 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.4.2 Detailed Functional DescriptionThe principle components are:4.2.1 Protocol FunctionsThe protocol block conducts a signaling and a voice channel in the transmit and receive directions. All dataI/O are CMOS levels.4.2.2 Audio Functions1) CODEC. The CODEC transcodes analog voice signals and 32 kbps ADPCM data.2) Audio Front End. The audio front end connects the analog voice I/O pins to the CODEC.3) Tone Ringer. The tone ringer produces amplitude controllable square-wave ringing tone signals foroutput on the RING pin.4) Biasing. The biasing circuits establish precision currents and voltage references to support audioand battery detection analog operations.5) DTMF Generator. The DTMF generator produces digitally-generated tones for DTMF dialing andcall progress tones.4.2.3 System Control Functions1. Microcontroller: An 8-bit 80C32T2 microcontroller executes the program and controls theprotocol logic and other hardware configuration. It includes 32 Kbytes of mask-programmableROM and a total of 1K bytes of RAM. It also includes an asynchronous serial port.2. Synchronous Serial Port: The serial port provides a synchronous serial link to devices suchas RF synthesizers, serial EEPROMs, etc. This is a different serial port function from that inthe Am79C490 and Am79C491.3. Peripheral Ports: The peripheral ports are for general purpose I/O functions. One port is designed such that any change of state generates an interrupt for the key scanning function.4. Regulator Control: The regulator control function controls an extermal bipolar transistor to implement a regulating function to provide a steady voltage to the rest of the system.5. Battery Level Detector: The battery level detector reports the low battery condition toprevent misoperation when batteries are low. It also emits a dead battery control signal whichcan be used to hold the device in a disabled, low power state and a high level detection forbattery charging control.6. Watchdog Timer: The watchdog timer protects the system from errant software by periodically issuing a reset unless serviced by software.7. Wakeup Timer: The wakeup timer is a multivibrator controlled by external passive

VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 19 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.components to effect a low power periodic wakeup for call detection.8. Interrupt Controller: The interrupt controller structures the various interrupts for manageable service by the microcontroller.9. Clock Generator: The clock generator creates required internal timing signals from thecrystal operating at 18.25 MHz. It also generates a PLL reference at the crystal frequency.10. Address decoder: The address decoder generates strobes accessing selected addressspaces in the device.

$VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 20 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.4.3 Port Pin Assignment And Functions4.3.1 Handset Port Pin AssignmentPort # Functional Description Direction LogicP0.0-7 ADDRESS/DATA BUS TRI-STATEP1.0 \On Cradle OUTPUT ACTIVE LOWP1.1 \Backlighting OUTPUT ACTIVE LOWP1.2 \Jog Dial A OUTPUT ACTIVE LOWP1.3 \Jog Dial B OUTPUT ACTIVE LOWP1.4 \Jog Dial SW2 INPUT ACTIVE LOWP1.5 LCD_E OUTPUT ACTIVE HIGHP1.6 LCD_R/W OUTPUTP1.7 LCD_RS INPUT ACTIVE HIGHP2.0 ADDRESS BUS TRI-STATEP3.0 ATE DATA RX INPUTP3.1 ATE DATA TX OUTPUTP4.0 Keypad Output OUTPUT ACTIVE LOWP4.1 Keypad Output OUTPUT ACTIVE LOWP4.2 Keypad Output OUTPUT ACTIVE LOWP4.3 Keypad Output OUTPUT ACTIVE LOWP4.4 Keypad Output OUTPUT ACTIVE LOWP5.0 Keypad Input INPUTP5.1 Keypad Input INPUTP5.2 Keypad Input INPUTP5.3 Keypad Input INPUTP5.4 Keypad Input INPUTP6.0 LCD_DB4 OUTPUTP6.1 LCD_DB5 OUTPUTP6.2 LCD_DB6 OUTPUTP6.3 LCD_DB7 OUTPUTP6.4P6.5GPIO.0GPIO.1GPIO.2 PLL EN OUTPUT ACTIVE HIGHGPIO.3 \TX EN OUTPUT ACTIVE HIGHGPIO.4 \RX EN OUTPUT ACTIVE HIGHGPIO.5 EE CS OUTPUT ACTIVE HIGH$

$VTECH ENGINEERING CANADA LIMITEDTITLE PDL MK3 Theory Of OperationMODEL SPP-ID970/1Reference: PRC XXX Revision: 1 Page: 21 of 211This document is proprietary to VTECH ENGINEERING CANADA LTD.107275THEO-970Specifications are preliminary and are subject to change without notice.4.3.2 Base Port Pin AssignmentPort # Functional Description Direction LogicP0.0-7 ADDR/DATA BUSP1.0 \Ring Detect INPUT ACTIVE LOWP1.1 \Hook Sw OUTPUT ACTIVE LOWP1.2 \Pots Mode INPUT ACTIVE LOWP1.3 \On Cradle INPUT ACTIVE LOWP1.4 Fast Charge OUTPUT ACTIVE HIGHP1.5P1.6P1.7P2.0 ADDRESS BUSP3.0 ATE DATA RX INPUTP3.1 ATE DATA TX OUTPUTP4.0 Page Key Output OUTPUT ACTIVE LOWP4.1P4.2P4.3P4.4P5.0P5.1P5.2P5.3P5.4 Page Key Input INPUTP6.0 \In Use/Line LED OUTPUT ACTIVE LOWP6.1 \Charge LED OUTPUT ACTIVE LOWP6.2 \Message LED OUTPUT ACTIVE LOWP6.3 \New Call LED OUTPUT ACTIVE LOWP6.4P6.5$

VTech Telecommunications 80-4258-05 SPP-ID970 Cordless Telephone User Manual PDL MK3 Theory of Operation

VTech Telecommunications Ltd SPP-ID970 Cordless Telephone PDL MK3 Theory of Operation

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PDL MK3 Theory of Operation

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