HT9032中文资料

HT9032

Calling Line Identification Receiver1April 6,2000Features

·HT9032B/C/D operating voltage:3.5V~5.5V HT9032F operating voltage:3.0V~5.5V ·Bell 202FSK and V.23demodulation·Ring detection input and output ·Carrier detection output

·Power down mode ·High input sensitivity·

HT9032C:16-pin DIP/SOP package HT9032B/F-A:8-pin DIP package HT9032D/F-B:8-pin SOP packageApplications·Feature phones·Caller ID adjunct boxes·

Fax and answering machines

·Computer telephony interface products ·ADSI productsGeneral Description

The HT9032calling line identification receiver is a low power CMOS integrated circuit de-signed for receiving physical layersignals tran-smitted according to Bellcore TR-NWT-000030and ITU-T V .23specifications.The primary ap-plication of thisdevice is for products used to

receive and display the calling number,or mes-sage waiting indicator sent to subscribers from the central office facilities.Thedevice also pro-vides a carrier detection circuit and a ring de-tection circuit for easier systemapplications.Block DiagramPin AssignmentHT90322April 6,

2000f

Pin Description

Pin Name I/O DescriptionPower Inputs

VDD?Power-VDD is the input power for the internal logic.VSS?Ground-VSS is ground connection for the internal logic.

PDWN I A logic212on this pin puts the chip in power down mode.When a logic202is on this pin,the chip is activated.This is aschmitt trigger input.Clock

X1I A crystal or ceramic resonator should be connected to this pin and X2. This pin may be driven from an external clocksource.

X2O A crystal or ceramic resonator should be connected to this pin and X1.Ring Detections

RDET1I It detects ring energy on the line through an attenuating network and enables the oscillator and ring detection.This isa schmitt trigger input.

RDET2I It couples the ring signal to the precision ring detector through an attenuating network.RDET=202if a valid ringsignal is detected.This is a schmitt trigger in-put.

RTIME I/O An RC network may be connected to this pin in order to hold the pin voltage be-low2.2V between the peaks of theringing signal.This pin controls internal power up and activates the partial circuitry needed to determine whether theincoming ring is valid or not.The input is a schmitt trigger input.The output cell structure is an NMOS output.FSK Signal Inputs

TIP I This input pin is connected to the tip side of the twisted pair wires.It is inter-nally biased to1/2V DD when the device is inpower up mode.This pin must be DC isolated from the line.

RING I This input pin is connected to the ring side of the twisted pair wires.It is inter-nally biased to1/2V DD when the deviceis in power up mode.This pin must be DC isolated from the line.Detection Results

RDET O This open drain output goes low when a valid ringing signal is detected.When connected to PDWN pin,this pin canbe used for auto power up.

CDET O This open drain output goes low indicating that a valid carrier is present on the line.A hysteresis is built-in to allowfor a momentary drop out of the carrier. When connected to PDWN pin,this pin can be used for auto power up.DOUT O This pin presents the output of the demodulator whenever CDET pin is low. This data stream includes thealternate212and202pattern,the marking,and the data.At all other times,this pin is held high.

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Pin Name I/O Description

DOUTC O This output presents the output of the demodulator whenever CDET pin is low and when an internal validationsequence has been successfully passed.This data stream does not include the alternate212and202pattern.This pin is al-ways held high.

Absolute Maximum Ratings

Voltages are referenced to V SS,except where noted.

Supply Voltage..............................-0.5V to6.0V All Input Voltages....................................25mW Operating TemperatureRange.......0°C to70°C Storage Temperature Range.....-40°C to150°C

Note:These are stress ratings only.Stresses exceeding the range specified under2Absolute Maxi-mum Ratings2may causesubstantial damage to the device.Functional operation of this device at other conditions beyond those listed in thespecification is not implied and prolonged expo-sure to extreme conditions may affect device reliability.D.C.Characteristics Crystal=3.58MHz,Ta=0~70°CSymbol ParameterTest Conditions

Min.Typ.Max.Unit V DD ConditionsV DD Supply Voltage?9032B/C/D 3.55 5.5V

9032F 3.05 5.5V I DD1Supply Current5V PDWN=0(3.58MHzOSCon)? 3.25mAI DD2Supply Current5V PDWN=1and RTIME=0(3.58MHz OSC on andinternal circuitspartially on) 1.9 2.5mA

I STBY Standby Current5V PDWN=1and RTIME=1

(3.58MHz OSC off)??1m A V IL Input Voltage Logic05V0.2V V DD V IH Input Voltage Logic15V?0.8V??V DD I OLOutput Voltage Logic05V I OL=1.6mA?0.1V V DD I OH Output Voltage Logic15V I OH=0.8mA0.9V??V DDI IN Input Leakage Current,All Inputs5V?-1?1m AV T-Input Low Threshold

Voltage5V RDET1,RTIME,PDWN 2.0 2.3 2.6V4April6,2000Symbol ParameterTest Conditions

Min.Typ.Max.Unit V DD ConditionsV T+Input High Threshold

Voltage5V RDET1,RTIME,PDWN 2.5 2.75 3.0V

V TRDET2Input Threshold Voltage5V RDET2 1.0 1.1 1.2VR IN Input DC Resistance5V TIP,RING?500?k W

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A.C.Characteristics -FSK Detection

V SS =0V ,Crystal=3.58MHz,Ta=0to 70°C,0dBm=0.7746Vrms @600W SymbolParameter Test Conditions Min.Typ.Max.Unit V DD ConditionsInput Sensitivity:TIP,RING5V -40-45?dBm S/NSignal to Noise Ratio 5V20?dB

Band Pass Filter 60Hz 550Hz 2700Hz 3300Hz5V Frequency Response Relative to 1700Hz @0dBm--4-3-34dB

Carrier Detect Sensitivity

5V ?-48?dBm t DOSC Oscillator Start Up Time 5V ??2?ms t SUPD Power Up to FSK Signal Set Up Time 5V ?15??ms tDAQ Carrier Detect Acquisition Time 5V ??14?ms t DCHEnd of Data to Carrier Detect High5V8ms

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Functional Description

The HT9032is designed to be the physical layer demodulator for products targeted for the caller ID market.The data signalinginterface should conform to Bell202,which is described as fol-lows:

·Analog,phase coherent,frequency shift keying ·Logical1(Mark)=1200+/-12Hz·Logical0(Space)=2200+/-22Hz ·Transmission rate=1200bps·Data application=serial,binary, asynchronous

The interface should be arranged to allow sim-ple data transmission from the terminating central office,to the CPE(CustomerPremises Equipment),only when the CPE is in an on-hook state.The data will be transmitted in the silent period between thefirst and second power ring before a voice path is established. The transmission level from the terminating C.O.will be-13.5dBm+/-1.0.The worst case at-tenuation through the loop is expected to be -20dB.The receiver therefore,should have asensitivity of approximately-34.5dBm to han-dle the worst case installations.The ITU-T V.23 is also using the FSK signalingscheme to transmit data in the general switched tele-phone network.For mode2of the V.23,the modulation rate andcharacteristic frequencies are listed below:

·Analog,phase coherent,frequency shift keying ·Logical1(Mark)=1300Hz ·Logical0(Space)=2100Hz ·Transmissionrate=1200bps

Since the band pass filter of the HT9032can pass the V.23signal,hence the HT9032also can demodulate the V.23signal.Ring detection

The data will be transmitted in the silent pe-riod between the first and second power ring be-fore a voice path is

established.The HT9032 should first detect a valid ring and then per-form the FSK demodulation.The typical ring detectioncircuit of the HT9032is depicted be-low.The power ring signal is first rectified through a bridge circuit and then sent to a re-sistor network that attenuates the incoming power ring.The values of resistors and capaci-tor given in the figure have beenchosen to pro-vide a sufficient voltage at RDET1pin to turn on the Schmitt Trigger input with approxi-mately a40Vrms or

greater power ring input from tip and ring.When V T+of the Schmitt is exceeded,the NMOS on the pin RTIME will be driven tosaturation discharging capacitor on RTIME.This will initialize a partial power up, with only the portions of the part involvedwith the ring signal analysis enabled,including RDET2pin.With RDET2pin enabled,a portion of the power ring above1.2V isfed to the ring analysis circuit.Once the ring signal is quali-fied,the RDET pin will be sent low.

7April6,2000Application CircuitsApplication circuit 18April 6,2000Operation mode

There are three operation modes of the HT9032.They are power down mode,partial power up mode,and power up mode.Thethree modes are classified by the following conditions:Modes ConditionsCurrent Consumption

Power down PDWN=212and RTIME=212<1m A

Partial power up PDWN=212and RTIME=202 1.9mA typically Power upPDWN=2023.2mA typically

Normally,the PDWN pin and the RTIME pin control the operation mode of the HT9032.When both pins are HIGH,theHT9032is set at the power down mode,consuming less than 1m A of supply current.When a valid power ring ar-rives,the

RTIME pin will be driven below V T-and the portions of the part involved in the ring signal analysis are enabled.This is partialpower up mode,consuming approximately

1.9mA typically.Once the PDWN pin is below V T-,the part will be fully powered up,and ready to receive FSK.During thismode,the device current will increase to approximately 3.2mA (typ).The state of the RTIME pin is now a 2don ￠t care 2as faras the part is concerned.Af-ter the FSK message has been received,the PDWN pin can be allowed to return to V DD and thepart will return to the power down mode.

Application circuit2

Application circuit3

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Copyright ?2000by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication.However,Holtek assumesno responsibility arising from the use of the specifications described.The applications mentioned herein are used solely forthe purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable withoutfurther modification,nor recommends the use of its products for application that may pres-ent a risk to human life due tomalfunction or otherwise.Holtek reserves the right to alter its products without prior notification.For the most up-to-dateinformation,please visit our web site at http://www.doczj.com/doc/00a9b727b4daa58da0114a96.html .Holtek Semiconductor Inc.(Headquarters)

No.3Creation Rd.II,Science-based Industrial Park,Hsinchu,Taiwan,R.O.C.Tel:886-3-563-1999Fax:886-3-563-11Holtek Semiconductor Inc.(Taipei Office)

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