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| HT9201A/B Simple Tone Dialer Features * * * Patent Number: 113235(R.O.C.), 5424740(U.S.A.) * * Operating voltage: 2.0V~5.5V Low standby current 4x4 keyboard matrix 3.58MHz crystal or ceramic resonator Four flash key times selectable for the HT9201B General Description The HT9201A/B tone dialers are CMOS LSIs designed for telecommunication systems. The HT9201A is for mute output whereas the HT9201B is for flash output. Both dialers provide good performance for regular DTMF dialing with low distortion output and minimal external components. Selection Table Function Item HT9201A HT9201B -- F1,F2,F3,F4 MUT E XM E UT Fla T im (m sh e s) -- 600/ 300/ 200/ 90 A,B,C,D DT M O F utput -- Package 16 DIP 16 DIP Pin Assignment 1 3rd Dec '97 HT9201A/B Keyboard Information Block Diagram Pin Description Pin Name I/O Internal Connection Description These pins form a 4x4 keyboard matrix which can perform keyboard input detection and dialing specification setting functions. When the chip is in the standby mode the column group (C1~C4) remains low whereas the row group (R1~R4) is set high for key input detection. An inexpensive single contact 4x4 keyboard can be used as an input device. Pressing a key connects a single column to a single row, and actuates the system oscillator which result in a dialing signal output. If more than two keys are pressed at a time, no response occurs. The key-in debounce time is 20ms. Refer to the keyboard information for keyboard arrangement. C1~C4 R1~R4 I/O CMOS IN/OUT 2 3rd Dec '97 HT9201A/B Internal Connection Pin Name I/O Description X1 I X2 O The system oscillator consists of an inverter, a bias resistor and the necessary load capacitor on chip. Connecting a standard 3.579545MHz crystal or ceramic resonator to the X1 OSCILLATOR and X2 terminals can implement the oscillator function. The oscillator is turned off in the standby mode, and is actuated whenever a keyboard entry is detected. XMUTE is an NMOS open drain structure pulled to VSS during dialing signal transmission. Otherwise, it is an open circuit. XMUTE is used to mute the speech circuit when transmitting the dial signal. The output is low when no keypad input is entered and it becomes high during dialing sequence. The timing diagram is shown in the operation timing. This pin is a CMOS output structure from which the chip receives the flash key (F1~F4) signals to break the telephone line for a flash time. For IC chip test only Positive power supply, 2.0V~5.5V for normal operation Negative power supply XMUTE O NMOS OUT MUTE O CMOS OUT FLASH O CMOS OUT CMOS IN Pull-High -- -- TEST VDD VSS I I I Approximate internal connection circuits Absolute Maximum Ratings* Supply Voltage ............................... -0.3V to 6V Input Voltage ............... VSS-0.3V to VDD+0.3V Storage Temperature ............... -50C to 125C Operating Temperature ............. -20C to 75C *Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extended periods may affect device reliability. 3 3rd Dec '97 HT9201A/B Electrical Characteristics Symbol VDD IDD ISTB VIL VIH IXMO IOLXM IOH1 IOL1 TDB FOSC (Ta=25C) Parameter Operating Voltage Operating Current Standby Current Input Low Voltage Input High Voltage XMUTE Leakage Current XMUTE Sink Current -- Test Conditions VDD Conditions Min. 2 Typ. -- 0.6 -- -- -- -- -- -- 400 20 Max. 5.5 2 1 0.2VDD VDD 1 -- -40 -- -- Unit V mA A 2.5V Keypad entry No load -- -- VSS 0.8VDD -- 1 -4 200 -- 2.5V No load, no entry -- -- -- -- -- VXMUTE=12V No entry V V A 2.5V VXMUTE=0.5V mA A A Keypad Pin Source Current 2.5V VOH=0V Keypad Pin Sink Current Key-in Debounce Time System Frequency 2.5V VOL=2.5V -- -- FOSC=3.5795MHz ms Crystal=3.5795MHz 3.5759 3.5795 3.5831 MHz (FOSC=3.5795MHz, Ta=25C) Tone Mode Electrical Characteristics Symbol VTDC ITOL VTAC RL ACR THD Parameter VDD DTMF Output DC Level DTMF Sink Current DTMF Output AC Level DTMF Output Load Column Pre-emphasis DTMF Signal Distortion -- Test Conditions Conditions -- Min. 0.45VDD 0.1 0.12 5 1 -- Typ. -- -- 0.155 -- 2 -30 Max. 0.7VDD -- 0.18 -- 3 -23 Unit V mA Vrms k dB dB 2.5V VDTMF=0.5V -- Row group, RL=5k 2.5V THD-23dB 2.5V Row group=0dB 2.5V RL=5k V12 + V22+ ... + Vn Vi 2 + Vh THD (Distortion) (dB) = 20 log ( 2 2 ) Vi, Vh: Row group and column group signals V1, V2, ... Vn: Harmonic signals (BW=300Hz~3500Hz) 4 3rd Dec '97 HT9201A/B Functional Description Keyboard matrix * F1, F2, F3, F4 C1~C4 and R1~R4 form a keyboard matrix. The keyboard arrangement for each of the HT9201 series are shown in the Keyboard Information. Tone frequency The flash keys can be selected with different flash times as shown in the following table. Flash time selection table Tone Name R1 R2 R3 R4 C1 C2 C3 C4 Output Frequency (Hz) Specified 697 770 852 941 1209 1336 1477 1633 Key % Error +0.29% -0.52% -0.59% +0.74% +0.50% -0.30% -0.34% +0.73% F1 F2 F3 F4 Keyboard operation Flash Time (ms) 600 300 200 90 Actual 699 766 847 948 1215 1332 1472 1645 Note: % Error does not contain the crystal frequency drift Key definition * 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, , #, A, B, C, D keys These are the dialing number input keys for normal operation. Timing Diagrams 5 3rd Dec '97 HT9201A/B Application Circuits Application circuit 1 6 3rd Dec '97 HT9201A/B Application circuit 2 7 3rd Dec '97 |
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