E2A0022-16-X0 ¡ Semiconductor MSM6234 ¡ Semiconductor This version: Jan. 1998 MSM6234 Previous version: Nov. 1996 DTMF Tone Dialer LSI GENERAL DESCRIPTION The MSM6234 is a tone dialer LSI which is fabricated by Oki's low power consumption CMOS silicon gate technology. The MSM6234 can generate 16 DTMF (Dual Tone Multi Frequency) signals which consists of 4 higher group frequencies and 4 lower group frequencies. FEATURES • The standard 2 of 8 keyboard can be used. • The low power consumption by use of CMOS silicon gate technology. • Supply voltage 2.5 V to 8.5 V. • Either single tone or dual tone output. • 3.579545 MHz crystal oscillation. • Interface with microcotroller. • Package: 16-pin plastic DIP (DIP16-P-300-2.54) (Product name : MSM6234RS) 1/12 ¡ Semiconductor MSM6234 BLOCK DIAGRAM 3.579545 MHz OSC I OSC OSC O V DD PR R1 R2 R3 KEY BOARD LOGIC (ROW) AKD MUTE LOGIC 1/2 CK [LOW] PROGRAMMABLE DIVIDER 160, 146, 132, 118 16f L CK 8 STAGE COUNTER LADDER NETWORK R R4 SINGLE TONE INHIBIT V DD V DD INHIBIT LOGIC V DD C1 C2 C3 VREF ADDER TONE OUT R KEY BOARD LOGIC (COLUMN) CK PROGRAMMABLE PR DIVIDER 92, 84, 76, 68 16f H CK 8 STAGE COUNTER LADDER NETWORK C4 V DD V SS [HIGH] V DD TONE DISABLE 2/12 ¡ Semiconductor MSM6234 PIN CONFIGURATION (TOP VIEW) 16 TONE OUT VDD 1 15 SINGLE TONE INHIBIT TONE 2 DISABLE C1 3 14 R1 C2 4 13 R2 C3 5 12 R3 VSS 6 11 R4 OSC1 7 10 AKD OSC0 8 9 C4 16-Pin Plastic DIP 3/12 ¡ Semiconductor MSM6234 PIN AND FUNCTIONAL DESCRIPTIONS OSCI, OSCO The 3.579545 MHz crystal oscillator is connected to these pins. A feedback resistor and the condensers are incorporated. OSC I C Crystal 3.579545 MHz RFB OSC O C MSM6234RS 4/12 ¡ Semiconductor MSM6234 R1, R2, R3, R4, C1, C2, C3, C4 These are input pins of negative logic to be connected to the keyboard. The standard 2 of 8 keyboard can be used with MSM6234RS as illustrated below. R 1 2 3 A 4 5 6 B 7 8 9 C * 0 # D V DD R1 R R2 R R3 R R4 R R = 20 kW to 150 kW C4 R C3 ROW R C2 COL R C1 V SS MSM6234RS 2 of 8 keyboard R1 to R4 are the input pins of the row side, while C1 to C4 are the input pins of the column side. All the pins are provided with the pull-up resistor of 20 kW to 150 kW internally. The dual tone is output from the TONE OUT pin, by setting both of a row input and a column input to the ground voltage. The Table 1 (See Note) shows the relation between the nominal frequency and the tone output frequency, while the Table 2 (See Note) shows the input condition of R1 to R4 pins and C1 to C4 pins. • Refer to the Table 1 and Table 2 Table-1 Nominal Frequency Tone Output Frequency Accuracy (%) R1 697 Hz 699.1 Hz +0.30% R2 770 Hz 766.2 Hz –0.49% R3 852 Hz 847.4 Hz –0.54% Effective Input (ROW) (COLUMN) R4 941 Hz 948.0 Hz +0.74% C1 1209 Hz 1215.9 Hz +0.57% C2 1336 Hz 1331.7 Hz –0.32% C3 1477 Hz 1471.9 Hz –0.35% C4 1633 Hz 1645.0 Hz +0.73% Remarks Low Group High Group 5/12 ¡ Semiconductor MSM6234 Table-2 Row Input Column Input Tone Output * No No 0V 1 1 fL + fH No 1 fH 1 No 0V More than 2 No 0V More than 2 1 fH No More than 2 0V 1 More than 2 fL More than 2 More than 2 0V Remarks Dual tone Single tone (Only column) Single tone Single tone fL: Low Group fH: High Group * : The tone output shown is in the case when the load resistance is connected between the TONE OUT pin and the VSS. Sample Interface Circuit with Microcontroller V DD MSM4049 R1 R1 R2 R2 R3 R3 R4 R4 C1 C1 C2 C2 C3 C3 C4 TONE OUT 1 6 8 C4 D tt V SS t id t t ≥ 50 ms and 30 ms £ tid £ 3 s Figure 1 6/12 ¡ Semiconductor MSM6234 AKD The AKD pin drives the external bipolar transistor by its N-channel open drain output. This pin is open when the key input is off, while it becomes low when the key input is on. AKD is used for the mute of the transmitter/receiver. Key input OFF ON OFF AKD Open "L" Open AKD MSM6234RS TONE DISABLE This is an input pin to control the output of the TONE OUT pin. When the input to this pin is high level, the TONE OUT pin normally operates. When the input to this pin is low level, however, the output from the TONE OUT pin is prohibited even if the key input is on. AKD is effective at that time. This pin is provided with the pull-up resistance of 50 kW to 200 kW internally. key input TONE DISABLE AKD TONE OUT ON OFF "L" "H" Open "L" OFF "L" Open "L" V DD 50 kW to 200 kW TONE DISABLE MSM6234RS 7/12 ¡ Semiconductor MSM6234 SINGLE TONE INHIBIT When more than two columns are selected against only one row, or when more than 2 rows are selected against only one column, the single tone is output from the TONE OUT pin. This SINGLE TONE INHIBIT pin is a negative logic input pin to control the output of the TONE OUT pin in those cases. Refer to the Table-2. When the input to this pin is high level, both of the single tone and dual tone are output from the TONE OUT pin. When the input to this pin is low level, however, the single tone is prohibited to output from the TONE OUT pin and becomes DC level. This pin is provided with the pull-up resistor of 50 kW to 200 kW. V DD 50 kW to 200 kW Pull up resistor SINGLE TONE INHIBIT MSM6234RS TONE OUT The low group frequency and the high group frequency selected by the keyboard are synthesized and output from this TONE OUT pin. Because the output form is the NPN open emitter style, the load resistance must be connected externally. It is same for the case of the single tone output. The output amplitude of the high group is bigger than that of the low group by 1 to 2 dB. The distortion of the dual tone is maximum 10%. V DD TONE OUT MSM6234RS R V SS VDD, VSS VDD is a power supply. VSS is ground. 8/12 ¡ Semiconductor MSM6234 Sample Output Waveform of the Single Tone V DD 1.0 13 0.9 14 15 15 15 12 0.8 13 12 11 0.7 14 11 10 10 9 0.6 9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 8 8 7 7 0.4 6 6 0.3 5 5 0.2 4 4 3 3 0.1 2 2 1 1 1 (VREF) Time 0.5 Figure 2 TONE AMPLITUDE (mV rms) Tone Amplitude (mV rms) 900 800 700 600 500 R L = 1 kW ROW TONE 400 300 3 4 5 6 7 V DD Æ V 8 9 Figure 3 9/12 ¡ Semiconductor MSM6234 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Condition Power Supply Voltage VDD Ta = 25°C –0.3 to 9.5 V Storage Temperature TSTG — –55 to +150 °C PD Ta = 25°C 500 mW Input Voltage VI — VSS – 0.3 to VDD + 0.3 V Output Voltage VO — VSS – 0.3 to VDD + 0.3 V Power Dissipation Rating Unit RECOMMENDED OPERATING CONDITIONS Symbol Condition Min. Typ. Max. Unit Power Supply Voltage Parameter VDD — 2.5 5 8.5 V Operating Temperature Top — –30 — +70 °C Crystal Frequency f(XT) Ta = –30°C to +70°C VDD = 2.5 V to 8.5 V — 3.579545 — MHz 10/12 ¡ Semiconductor MSM6234 ELECTRICAL CHARACTERISTICS DC Characteristics Parameter Input High Voltage (Ta = –30°C to +70°C) VIH Condition — 0.7VDD — VDD Input Low Voltage VIL — VSS — 0.3VDD Low Level Input Leakage Current IIL VDD = 8.5 V, VIL = 0 V –0.0567 — –0.425 235 — 437 mV rms TONE OUT Symbol Min. Typ. Max. Unit Applicable Pin V C1 to C4, R1 to R4 V C1 to C4, R1 to R4 mA C1 to C4, R1 to R4 "TONE OUT" Output Voltage VOUT VDD = 3.0 V, RL = 1 kW Difference of High/Low Band Level dB CR VDD = 3.0 V to 8.5 V 1 1.5 2 dB TONE OUT Distortion % DIS VDD = 3.0 V to 8.5 V — — 10 % TONE OUT High Level Input Leakage Current Low Level Input Leakage Current IIH VDD = 8.5 V, VIH = 8.5 V — — 1 mA C1 to C4, R1 to R4 STI, TOND* IIL VDD = 8.5 V, VIL = 0 V –42.5 — –170 mA STI, TOND* Input High Voltage VIH — 0.7VDD — VDD V STI, TOND* Input Low Voltage VIL — 0.3VDD V STI, TOND* IDDS — VDD = 8.5 V, No load, Key-OFF VSS Power Supply Current (Stand-by) — — 200 mA Power Supply Current (Operating) IDD VDD = 8.5 V, RL = 1 kW, No load, Key-ON — — 25 mA Low Level Output Leakage Current IOL VDD = 3 V, VOL = 0.5 V VDD = 8.5 V, VOL = 0.5 V 0.53 2.0 1.3 5.3 — — mA AKD "OFF" Leakage Current IOFF VDD = 8.5 V — — 10 mA AKD TONE OUT Rise Time trise VDD = 3.0 V to 8.5 V — 3.0 5.0 ms TONE OUT *: STI Æ SINGLE TONE INHIBIT TOND Æ TONE DISABLE 11/12 ¡ Semiconductor MSM6234 PACKAGE DIMENSIONS (Unit : mm) DIP16-P-300-2.54 Package material Lead frame material Pin treatment Solder plate thickness Package weight (g) Epoxy resin 42 alloy Solder plating 5 mm or more 0.99 TYP. 12/12