EM91710A/B TONE/PULSE TONE/PULES SWITCHABLE DIALER

Transcription

1 EM970A/B /PULSE /PULES SWITCHABLE DIALER GENERAL DESCRIPTION FEATURES The EM970A/B are Tone/Pulse switchable dialer which are fabricated in CMOS technology with wide operating voltage for both tone and pulse mode, and consumes very low memory retention current in ON-HOOK state. Tone/pulse switchable dialer. One 2-digit last number redial memory. Pulse to tone (P T) is provided for PBX operation. Flash key is available. Minimum tone duration is 98ms or 8ms. Minimum intertone pause is 98ms or 8ms. Uses MHz crystal or ceramic resonator. Many options can be selected. Mode (0 PPS ; 20 PPS ; Tone) M/B ratio (40 : 60 ; : 66) Pause time (.6s) Flash function (RESET) P T pause time (.6s) Flash time (600ms; 00ms; 00ms; or 80ms). Mixed dialing. Handfree function is provided for speaker phone application. Power on reset circuit is provided. Package in DIP8 or DIP6. PIN ASSIGNMENTS EM970A EM970B C2 C C4 C OSCI V SS R R2 R R4 VDD C2 C C4 C OSCI VSS HFI R R2 R R4 VDD HFO * This specification are subject to be changed without notice

2 /PULSE SWITCHABLE DIALER KEYBOARD ASSIGNMENT C C2 C C4 R 2 P T R F R P R4 *or*/t 0 # RD ). P T : In pulse mode, execute P T function. 2). F : Flash key. ). RD : Redial key. 4). P : Pause key. 5). */T : In pulse mode, execte P T function In tone mode, execte "*" key. FUNCTIONAL BLOCK DIAGRAM COL COL2 COL COL4 OSCI ROW ROW2 ROW ROW4 OSC. COLUMN INTERFACE CKT. DIVIDER ROW INTERFACE CKT. KERNEL CONTROL CKT. OUTPUT INTERFACE CKT. LNB MEMORY INPUT INTERFACE CKT. PULSE GENERATOR DECODER & DATA LATCH ROW/COLUMN PROGRAMMING COUNTER D/A CONVERTER HFI HFO DIALING SIGNAL OPTION : a]:flash time: Row Row4 flash time(ms) NR NR 600 NR R 00 R NR 00 R R 80 b). Row Row2 MODE PULSE RATE M/B R NR R R NR NR PULSE 20PPS 40:60 NR R PULSE 20PPS :66 UR NR PULSE 0PPS 40:60 c]:tone function: Col Tone Duration NR 98 ms R 8 ms inter-tone Pause 98 ms 8 ms UR R PULSE 0PPS :66 d]:key type select Col2 *or*/t select NR * Note: NR:no resistance. R : A resistance connect to Vss (820KΩ typically) R */T UR: A resistance connect to VDD * This specification are subject to be changed without notice

3 /PULES SWITCHABLE DIALER PIN DESCRIPTION Symbol C C2 C C4 R R2 R R4 Function Provides keyboard scanning. a. Keyboard scanning: pin is LOW, the column group stays in "HIGH" stays and row group stays in "LOW" state. The key pad is compatible with the standard dual contact matrix keyboard (as Figure b.), the inexpensive single contact keyboard (as Figure a.), and electronic input (as Figure c.). When is low, a valid key entry is defined by related Row & Column connection or by electronic input; (as show in Figure c). Activation of two or more keys will result in no response, except for single key. To avoid keyboard bouncing error, this chip provides built-in debounce circuit. (The debounce time = 20 ms.) Row Column Figure a : Single contact form keyboard configuration Row Column Figure b : Dual contact form keyboard configuration Row Column Figure c : Electronic signal input keyboard configuration OSCI Oscillator input & Oscillator output pins. The MHz oscillator is formed by a built-in inverter inside of this chip and by connecting a MHz crystal or a ceramic resonator across the OSCI and pins. (built-in feedback resistor and capacitor) When is low, a valid key-in may turn on this oscillator and generates a MHz clock. Mute output pins. NMOS open drain output structure. The output is in low state during dialing sequence (both Pulse and Tone mode) otherwise this pin is high-impedance. Long (continue) Mute. Negative power supply pin. Positive power supply pin. Hook switch input pin. When the handset is in ON-HOOK state, this pin must be pulled high in order to disable the dialing operation and decrease the power consumption. When in OFF-HOOK state, the pin must be pulled low state for all function operation. Pulse output signal pin. NMOS open drain output structure. The output is low during pulse dialing and Flash operation, otherwise this output is floating. * This specification are subject to be changed without notice

4 /PULSE SWITCHABLE DIALER Symbol HFI HFO Function Dual Tone Multi-frequency output pin. In mode, when a entry of digit key (include *, # key), this pin will sent out a corresponding DTMF signal. The pin provides minimum tone duration (t TD ),& minimum intertone pause time to support rapid key-in. If key-in time is less than t TD, DTMF signal will last for t TD, otherwise the tone duration will last as long as the key is pressed. Handfree input control pin. Toggle input sturcture, falling edge trigger. It is used to enable and disable Handfree function. With waveshaped by a built-in Schmit trigger, the bounce of input can be eliminated by external R, C debounce circuit. A built-in pull up resistor is 200K typical. Handfree output pin. Inverter output structure (normally "low", active "high"). When a HFI pin is active, Handfree function will be enabled (HFO=) or disabled (HFO=0). When the Handfree function is enable (HFO=), after OFF-HOOK action, it can reset Handfree function and HFO pin return to "low" state. FUNCTION DESCRIPTION Keyboard Operation Symbol definitions: a). : OFF-HOOK or enable Hand Free function. b). : ON-HOOK or disable Hand Free function. c). D...D n : Digit key;,2,,4,5,6,7,8,9,0,*,# (C...C n is same as D...D n ). d). D P... D Pn : Pulse digit ;,2,,4,5,6,7,8,9,0, (C P... C Pn is same as D P... D Pn ). e). D t...d tn : Tone digit ;,2,,4,5,6,7,8,9,0,*, # (C t...c tn is same as D t...d tn ). f). t F : Flash time. g). t P : Pause time. h). t PT : Pulse to Tone wait time. i). t FP : Pause time for flash. j). t RP : Pause time for redial. k). LNB : Last number redial buffer. A. Normal Dialing. Digit Dialing Procedure : D,D , Dn Dial out : Dt, Dt , Dtn in tone mode Dial out : Dp, Dp , Dpn in pulse mode LNB : D, D Dn * This specification are subject to be changed without notice

5 /PULES SWITCHABLE DIALER 2. Dialing with flash key Procedure : F,D,D , Dn Dial out : t F, Dt,Dt , Dtn in tone mode Dial out : t F,Dp,Dp , Dpn in pulse mode LNB : D, D Dn. Dialing with P T key Procedure : D, D ,P T,....., Dn Dial out : Dp, Dp2,.... t PT,....., Dtn in pulse mode LNB : D, D2.....,P T,.... Dn Note : If key in digit over maximum digit stored in LNB, then RD is inhibited even after on/off hook. B. Mixed dialing Procedure : D, D ,P T, D9,D0,....., Dn Dial out : Dp, Dp2,.... t PT, Dt9,Dt0....., Dtn LNB : D, D2.....,P T, D9,D0.... Dn C. Redial LNB : D, D Dn Procedure : RD Dial out : Dt, Dt2,.... Dtn in tone mode Dial out : Dp, Dp2,.... Dpn in pulse mode Note : If key in digit over maximum digit stored in LNB, then RD is inhibited. D. Pause Function Procedure : D, D2,....Dn, P, C.....Cn Dial out : Dt, Dt2,.... Dtn, tp, Ct Ctn in tone mode Dial out : Dp, Dp2,.... Dpn,tp, Cp Cpn in pulse mode LNB : D, D Dn, P, C, C Cn E. Flash Function. Reset Procedure : D, D2,....Dn, F, C.....Cn Dial out : Dt, Dt2,.... Dtn, t F,Ct Ctn in tone mode Dial out : Dp, Dp2,.... Dpn, t F,Cp Cpn in pulse mode LNB : C, C Cn Handfree function operation: A). To execute Handfree function : When HFO = "low", HFI pin is active, the Handfree function will be enabled (HFO="HIGH"). B). Reset Handfree function: a. OFF-HOOK action. b. When HFO="high", a HFI pin is active again, the Handfree function will be reset (HFO="LOW"). * This specification are subject to be changed without notice

6 /PULSE SWITCHABLE DIALER Operating flow chart of Handfree ON INITIAL (0) HF HF OFF ON ON HF LINE () OFF OFF LINE (2) HF ON OFF HF LINE () HF STATE NO. HFO (0) INITIAL STATE F F 0 () ON HF LINE F F (2) OFF LINE F F 0 () OFF HF LINE F F * F : Floating (Hi-impedance) * Note : ON : ON OFF : OFF HF : Pressed HF key * This specification are subject to be changed without notice

7 /PULES SWITCHABLE DIALER TEST CIRCUIT V+ A Operation current 2 A V+ Standby current KEY BOARD MODE DP DP DT COUNTER AND AC METER. V+ Tone output voltage 4 SPECTRUM ANALYZER V+ Tone distortion 0K KEYBOARD ENTRY 0K V KEYBOARD ENTRY 5 ** DIST.(dB)= 20log (V)**2+(V2)**2+..+(Vn)**2 (VL)**2+(VH)**2 V + Pulse output sink current( open drain structure) a. V...Vn are extraneous frequencies (ie, inter modulation and harmonic) components in the 500Hz to 400Hz band. b. VL,VH are the individual frequency components of the DTMF signal c. Whether keyboard is pushed refer to the mode time diagram 6 V + Keypad input A V VEXT Flash Key A VDD ROW VSS MODE R * C * 7 V+ A Column MODE R * C * Isink=I/(-Duty Cycle) I is the net DC current measured from ampere meter. R*, C* mean others column and row. * This specification are subject to be changed without notice

8 /PULSE SWITCHABLE DIALER ABSOLUTE MAXIMUM RATINGS (Ambient Temperature is 25 C, All voltage referenced to. ) Parameter Sym. Ratings Unit Power Supply Voltage 6.0 V Input Voltage Range V IN -0. ~ + 0. V Operating Temperature T OPR 0 ~ 50 C Storage Temperate T STO -55 ~25 C Power Dissipation P D 500 mw ELECTRICAL CHARACTERISTICS (I) (Ambient Temperature is 25 C, All voltage referenced to, = 2.5V, unless otherwise noted.) (General purpose specification, fosc. = MHz) Parameter Sym. Conditions Min. Typ. Max. Unit Operating Voltage Tone Pulse V Memory retension Operating Current Iop Tone ma OFF-HOOK, Keypad entry Pulse ma Standby Current Is ON-HOOK, No Keypad entry - 0. µa Memory retention current Imr ON-HOOK, =.0V µa Control pin input voltage Vil - 0. V Vih V pin leakage current Imth Vxmute = 6.0V - - µa sink current Imtl Vxmute = 0.5V ma pin input current Ihks Vhks = 2.5V µa Keyboard scanning pin drive current Ikbd *Vn = 0V, µa sink current Ikbs *Vn = 2.5V, µa Key-in debounce time t DB ms HFI pin input resistor Rhfi Vhfi= KΩ HFO pin drive current Ihdoh Vhfo = 2.0V ma sink current Ihdol Vhfo = 0.5V ma * Vn : Input voltage of any keyboard scanning pin (Row group, Column group). * This specification are subject to be changed without notice

9 /PULES SWITCHABLE DIALER ELECTRICAL CHARACTERISTICS (II) (Ambient Temperature is 25 C, All voltage referenced to, = 2.5V, unless otherwise noted.) (Pulse mode specification, fosc. = MHz) Parameter Sym. Conditions Min. Typ. Max. Unit Pulse output pin,sdo pin leakage current Ipoh Vpo = 2.5V ua sink current Ipol Vpo = 0.5V ma Pulse rate fpr pps pps Make/Break ratio TM:TB - 40:60 - % - :66 - % Pre-digit Pause t PDP M/B ratio = 40: ms M/B ratio = : ms Inter-digit Pause t IDP Pulse rate = 0pps ms Pulse rate = 20pps ms ELECTRICAL CHARACTERISTICS (III) (Ambient Temperature is 25 C, All voltage referenced to, = 2.5V, unless otherwise noted.) ( mode specification, fosc. = MHz) Parameter Sym. Conditions Min. Typ. Max. Unit output pin DC level Vdc = 2.0V~5.5V V sink current Itl Vdtmf = 0.5V ma AC level Vdtmf Row group, RL = 0KΩ mvrms Load resistor Rl Dist. -2dB KΩ DTMF signal: pre-emphasis twist = 2.0~5.5V, Column-Row group 2 db *distortion Dist. RL = 0KΩ db Minimum tone duration t TD Auto redial - 98/8 - ms Minimum intertone Auto redial - 98/8 - ms pause 2 2 * Distortion (db) = 20 log { [(V + V 2 + V V n ) /2 2 ] / [(V L + V H2 ) /2 ]}. V L, V H : Row group and Column group signal. V,V 2,..., V n : Harmonic signal (BW = 00 Hz~ 500 Hz). * Actual frequency output (fosc. = MHz) KEYBOARD SCANNING PIN STANDARD (Hz) OUTPUT (Hz) DEVIATION (%) R f R2 f R f R4 f C f C2 f C f * This specification are subject to be changed without notice

10 /PULSE SWITCHABLE DIALER KEY IN 2 t DB t TD NORMAL DIALING High impedance Figure 2: Tone Mode Timing Diagram KEY IN 2 t DB t PDP tidp t M t B tidp t M t IDP * This specification are subject to be changed without notice. NORMAL DIALING Figure : Pulse Mode Timing Diagram High impedance

11 /PULES SWITCHABLE DIALER KEY IN 2 P->T t DB t PDP t IDP t IDP T pt High impedance Figure 4: Timing Waveform for mixed dialing Operation (by P T key entry) KEY IN 2 t DB RD t D AUTO DIALING High impedance Figure 5: Tone Mode Redial Timing Diagram * This specification are subject to be changed without notice

12 /PULSE SWITCHABLE DIALER KEY IN 2 RD t DB t IDP t IDP t IDP t IDP High impedance Figure 6: Pulse Mode Redial Timing Diagram KEY IN 2 P *PULSE MODE: t DB t PDP t IDP t IDP T P t IDP * MODE: t DB T p High impedance * This specification are subject to be changed without notice. Figure 7: Pause key operating timing

13 /PULES SWITCHABLE DIALER KEY IN F t DB T F High impedance Figure 8: Flash key operation timimg * This specification are subject to be changed without notice

14 /PULSE SWITCHABLE DIALER APPLICATION CIRCUIT Tip Ring 4 7 * EM970A Application Example IN4004*4 22M 00K HOOK SW ON OFF IN K IN448 IN448 00µ 6V.µ 9 MPSA92 0K 2K2 ZNR 20V MPSA42 00K 6 9 # VDD EM970A C C2 C C4 4 2 R R2 R R4 P T F OSCI VSS Z.D. 5V 470K 2 P R/P 7 2K7 C945 00µ/6V 220K µ 00K 2 WIRE TO 4 WIRE SPEECH NETWORK TO HANDSEET VDD MHz 0 820k*6 20PPS 0PPS * This specification are subject to be changed without notice

15 /PULES SWITCHABLE DIALER APPLICATION CIRCUIT Tip Ring IN4004*4 HOOK ON ZNR 20V EM970B Application Example 22M 00K IN448 MPSA92 0K 0.µF 2K7 2K2 200K IN K C K 00K + µ 00µ 6V +.µ 5V K 47K C V DD 00K 47K HFO HF KEY MHz.µ 9 HFI EM970B 5 7 OSCI 0 HFO 6 8 C4 C C2 2 R R2 R R4 C K*6 C945.02µ TO 4 WIRE SPEECH NETWORK & AUDIO AMPLIFIER TO HANDSET 4 7 * # P T F P RD VDD 20PPS 0PPS * This specification are subject to be changed without notice

16 /PULSE SWITCHABLE DIALER PACKAGE INFORMATION Example : EM 970 P () (2) () () ELAN MICRO. pefix (2) Type number () Package code: P PDIP K Skinny R SDIP 6 Lead Plastic Package E E D A A L C eb B e B 6 PDIP MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A B B C D E E e eb L * This specification are subject to be changed without notice

17 /PULES SWITCHABLE DIALER 8/20/28 Lead Plastic Package E E D A A L C eb 8 PDIP MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A B B C D E E e eb L B e 20 PDIP MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A B B C D E E e eb L B 28 PDIP MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A B B C D E E e eb L * This specification are subject to be changed without notice

18 /PULSE SWITCHABLE DIALER 22/24 Lead Plastic Package-Skinny E E D A A L C eb B e B 22 PDIP (skinny) MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A B B C D E E e eb L PDIP (skinny) MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A B B C D E E e eb L * This specification are subject to be changed without notice

19 /PULES SWITCHABLE DIALER 42 SDIP Package E E D C A A2 A L D eb B e B 42 SDIP MILIMETERS INCHES DIM MIN. MAX. MIN. MAX. A A A B B C D E e eb D L * This specification are subject to be changed without notice