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E2A0022-16-X0
Semiconductor MSM6234
Semiconductor DTMF Tone Dialer LSI
This version: Jan. 1998 MSM6234 Previous version: Nov. 1996
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)
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Semiconductor
MSM6234
BLOCK DIAGRAM
3.579545 MHz OSC I OSC O OSC V DD R1 R2 R3 R4 SINGLE TONE INHIBIT C1 C2 C3 C4 V DD V SS TONE DISABLE [HIGH] V DD
KEY BOARD LOGIC (COLUMN) KEY BOARD LOGIC (ROW)
1/2 [LOW]
PROGRAMMABLE DIVIDER 160, 146, 132, 118 16f L CK R
MUTE LOGIC PR CK
AKD
8 STAGE COUNTER
LADDER NETWORK
V DD V DD V DD INHIBIT LOGIC
R VREF ADDER
TONE OUT
8 STAGE COUNTER LADDER NETWORK
CK PROGRAMMABLE PR
DIVIDER 92, 84, 76, 68
16f H CK
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Semiconductor
MSM6234
PIN CONFIGURATION (TOP VIEW)
VDD 1 TONE 2 DISABLE C1 3 C2 4 C3 5 VSS 6 OSC1 7 OSC0 8
16 TONE OUT 15 SINGLE TONE INHIBIT 14 R1 13 R2 12 R3 11 R4 10 AKD 9 C4
16-Pin Plastic DIP
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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 Crystal 3.579545 MHz C RFB OSC O C MSM6234RS
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Semiconductor 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 4 7 * 2 5 8 0 3 6 9 # A B C D R1 R R2 R R3 R R4 R C4 R ROW COL V SS 2 of 8 keyboard C3 R C2 R C1 MSM6234RS R = 20 kW to 150 kW V DD
MSM6234
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
Effective Input R1 (ROW) R2 R3 R4 C1 (COLUMN) C2 C3 C4 Nominal Frequency 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1336 Hz 1477 Hz 1633 Hz Tone Output Frequency 699.1 Hz 766.2 Hz 847.4 Hz 948.0 Hz 1215.9 Hz 1331.7 Hz 1471.9 Hz 1645.0 Hz Accuracy (%) +0.30% -0.49% -0.54% +0.74% +0.57% -0.32% -0.35% +0.73% High Group Low Group Remarks
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Semiconductor
MSM6234
Table-2
Row Input No 1 No 1 More than 2 More than 2 No 1 More than 2 Column Input No 1 1 No No 1 More than 2 More than 2 More than 2 Tone Output * 0V fL + fH fH 0V 0V fH 0V fL 0V Single tone Single tone Dual tone Single tone (Only column) Remarks
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 R2 R3 R4 C1 C2 C3 C4 TONE OUT tt t id t t 50 ms and 30 ms tid 3 s 1 6 8 D
R1 R2 R3 R4 C1 C2 C3 C4
V SS
Figure 1
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Semiconductor AKD
MSM6234
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 AKD AKD MSM6234RS
OFF
ON
OFF
Open
"L"
Open
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
OFF "H" Open "L"
ON "L" "L"
OFF
Open "L"
V DD 50 kW to 200 kW TONE DISABLE MSM6234RS
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Semiconductor SINGLE TONE INHIBIT
MSM6234
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.
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Semiconductor
MSM6234
Sample Output Waveform of the Single Tone
V DD 1.0 0.9 0.8 0.7 0.6 0.5 9 10 11 13 12 15 15 15
14
14
13 12 11 10 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 2 111 (VREF) Time
Figure 2
Tone Amplitude (mV rms)
TONE AMPLITUDE (mV rms)
900 800 700 600 500 400 300 R L = 1 kW ROW TONE
3
4
5
6
7 V DD AE V
8
9
Figure 3
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Semiconductor
MSM6234
ABSOLUTE MAXIMUM RATINGS
Parameter Power Supply Voltage Storage Temperature Power Dissipation Input Voltage Output Voltage Symbol VDD TSTG PD VI VO Condition Ta = 25C -- Ta = 25C -- -- Rating -0.3 to 9.5 -55 to +150 500 VSS - 0.3 to VDD + 0.3 VSS - 0.3 to VDD + 0.3 Unit V C mW V V
RECOMMENDED OPERATING CONDITIONS
Parameter Power Supply Voltage Operating Temperature Crystal Frequency Symbol VDD Top f(XT) Condition -- -- Ta = -30C to +70C VDD = 2.5 V to 8.5 V Min. 2.5 -30 -- Typ. 5 -- 3.579545 Max. 8.5 +70 -- Unit V C MHz
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Semiconductor
MSM6234
ELECTRICAL CHARACTERISTICS
DC Characteristics
Parameter Input High Voltage Input Low Voltage Low Level Input Leakage Current "TONE OUT" Output Voltage Difference of High/Low Band Level Distortion High Level Input Leakage Current Low Level Input Leakage Current Input High Voltage Input Low Voltage Power Supply Current (Stand-by) Power Supply Current (Operating) Low Level Output Leakage Current "OFF" Leakage Current TONE OUT Rise Time
Symbol
(Ta = -30C to +70C) VIH VIL IIL Condition -- -- VDD = 8.5 V, VIL = 0 V Min. 0.7VDD VSS -0.0567 235 1 -- -- -42.5 0.7VDD VSS -- -- 0.53 2.0 -- -- Typ. -- -- -- -- 1.5 -- -- -- -- -- -- -- 1.3 5.3 -- 3.0 Max. VDD 0.3VDD -0.425 437 2 10 1 -170 VDD 0.3VDD 200 25 -- -- 10 5.0 Unit Applicable Pin V C1 to C4, R1 to R4 V C1 to C4, R1 to R4 mA C1 to C4, R1 to R4 mV rms dB % mA mA V V mA mA TONE OUT TONE OUT TONE OUT C1 to C4, R1 to R4 STI, TOND* STI, TOND* STI, TOND* STI, TOND*
VOUT VDD = 3.0 V, RL = 1 kW dB CR % DIS IIH IIL VIH VIL IDDS IDD VDD = 3.0 V to 8.5 V VDD = 3.0 V to 8.5 V VDD = 8.5 V, VIH = 8.5 V VDD = 8.5 V, VIL = 0 V -- -- VDD = 8.5 V, No load, Key-OFF VDD = 8.5 V, RL = 1 kW, No load, Key-ON VDD = 3 V, VOL = 0.5 V VDD = 8.5 V, VOL = 0.5 V VDD = 8.5 V VDD = 3.0 V to 8.5 V
IOL IOFF trise
mA mA ms
AKD AKD TONE OUT
*: STI AE SINGLE TONE INHIBIT TOND AE TONE DISABLE
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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.
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