DTMF DIALER FOR BINARY DATA-IN S5T0167 INTRODUCTION 14−DIP−300 The S5T0167 is a DTMF dialer for 4 bit binary data input from the microprocessor. When the tone enable input is low, the oscillator is inhibited and the device is in a low power consumption at standby mode.On the low to high transition of tone enable, data is latched into the device and selected the standard DTMF signals. The N-channel open drain output provides a MUTE output during tone generation. FEATURES 14−SOP−225B • Direct interface with microprocessor • Generates 16 standard tones • Uses inexpensive TV crystal or ceramic resonator (3.579545MHz) • Very low total harmonic distortion • Low power standby mode • Binary data inputs with latches • Wide Operating Voltage : 2.5 ~ 8.0V ORDERING INFORMATION Device Package S5T0167X01-D0B0 14−DIP−300 S5T0167X01-S0B0 14−SOP−225B Operating Temperature − 30 to +70°C 1 S5T0167 DTMF DIALER FOR BINARY DATA-IN BLOCK DIAGRAM VDD MUTE OSC IN OSC MUTE LOGIC CONTROL CIRCUIT ROW & COLUMN TONE COUNTER OSC OUT TEN ST GS 4 D0 D1 D2 D/A CONVERTER & MIXING DATA LATCH & DECODER D3 VSS PIN CONFIGURATION 2 VDD 1 14 TONE OUT TEN 2 13 NC ST 3 12 D3 GS 4 11 D2 VSS 5 10 D1 OSC IN 6 9 D0 OSC OUT 7 8 MUTE S5T0167 TONE OUT DTMF DIALER FOR BINARY DATA-IN S5T0167 PIN DESCRIPTION Pin No Symbol 1 VDD Positive supply input 2 TEN Tone enable input. An internal pull-up resistor is in a chip. When this pin connects to logic low, the oscillator is inhibited and the tone generators and output transistor are turned off. A low to high transition on this pin latches in data from D0 ~ D3, and tone generation continues until this pin is connected low again. 3 ST Single tone enable. An internal pull-up resistor is in a chip. When this pin connects to logic low, the device is in a single tone mode. For normal operation, connects this pin to VDD or open-circuit. 4 GS Group selection input. This pin is used to select the high group or low group frequency, when the device is in single tone mode. An internal pull-up resistor is in a chip. When this pin connects to VDD or open, the high group will be generated, and when connects to VSS, the low group will be generated. 5 VSS Negative supply input 6 OSC IN 7 Descriptions Oscillator input OSC OUT Oscillator output 8 MUTE N-channel open drain output. This pin is a logic high state, when the tone enable pin is a high state. This pin goes a logic low state, when the tone enable pin is a low state. 9, 10, 11, 12 D0, D1, D2, D3 DATA-INPUTS. These are the inputs for binary-coded data, which is latched in on the rising edge of the tone enable signal. 13 N.C 14 Tone out No connection. This output is the open emitter of a NPN transistor. When an external load resistor is connected from this pin to VSS, the tone generates on the tone enable pin = High. ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Supply Voltage VDD 9 V MUTE Voltage VI (MUTE) 9 V Input Voltage VI VDD + 0.3 to VSS - 0.3 V Power Dissipation PD 500 mW Operating Temperature TOPR − 30 to + 70 °C Storage Temperature TSTG − 55 to + 125 °C 3 S5T0167 DTMF DIALER FOR BINARY DATA-IN ELECTRICAL CHARACTERISTICS (VSS = 0V, 2V<VDD<8V, fOSC = 3.579545MHz, Ta = 25°C, unless otherwise noted) Characteristic Symbol Test Conditions Min. Typ. Max. Unit − 2.0 − 8.0 V Operating voltage range VDD Operating Current IDD VDD = 3.0V, MUTE Open − − 1.5 mA Standby Current ISB RL = 10K, D0 to D3 open, VDD = 3.0V − 50 100 µA Input Pull-up resistance RI (PULL) DI0 to DI3, TEN − 100 − KΩ Input Voltage VIL DI0 to DI3, TEN VSS − 0.2VDD V 0.8VDD − VDD V 0.5 1.5 − mA − 1 2 µA −14 − −11 dBV 1 2 3 dB −20 − − dB − 4 − mS VIH Output Current (MUTE) IOL (MUTE) VDD = 3V, VO = 0.5, TEN = LOW IOH (MUTE) VDD = 3V, VO = VDD, TEN = HIGH Tone Output Level VO (TONE) VDD = 3V, R L = 5kΩ, Row Tone Ratio of Column to Row dBCR VDD = 3V, R L = 5kΩ THD (Dual Tone) THD 1MHz Bandwidth, VDD = 5V, RL = 5kΩ Oscillator Start-up Time tST (OSC) 90% Amplitudes, VDD = 3.0V Data Set-up Time tSU (DATA) VDD = 3.0V 200 − − nS Data Hold Time tH (DATA) VDD = 3.0V 200 − − nS Data Duration tW (DATA) VDD = 3.0V 600 − − nS APPLICATION INFORMATION FUNCTION DESCRIPTION When tone enable input is low, oscillator is inhibited, being allowed to low power standby mode since transistor goes to turn off state, so D0 to D3 input data is ignored. However if tone enable input goes from low to high, input data is latched and tone output is enabled, and it is correspond to data input. This device is designed with 14 levels, 28 segments in each single-tone. The column tone is pre-emphasized 2dB than the row tone. Table 1. Single Tone Frequency Tone Group Standard DTMF (Hz) Tone Output Actual Frequency ROW 1 ROW 2 ROW 3 ROW 4 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 4 697 770 852 941 1209 1336 1477 1633 699.13 766.17 845.43 947.97 1215.89 1331.67 1471.85 1645.01 % Deviation from Standard + 0.31 − 0.50 − 0.54 + 0.74 + 0.57 − 0.33 − 0.35 + 0.75 DTMF DIALER FOR BINARY DATA-IN S5T0167 Table 2. Function Table Key Board Data Input Tone Output Equivalent D3 D2 D1 D0 fL (Hz) fH (Hz) 1 0 0 0 1 697 1209 2 0 0 1 0 697 1336 3 0 0 1 1 697 1477 4 0 1 0 0 770 1209 5 0 1 0 1 770 1336 6 0 1 1 0 770 1477 7 0 1 1 1 852 1209 8 1 0 0 0 852 1336 9 1 0 0 1 852 1477 0 1 0 1 0 941 1336 * 1 0 1 1 941 1209 # 1 1 0 0 941 1477 A 1 1 0 1 697 1633 B 1 1 1 0 770 1633 C 1 1 1 1 852 1633 D 0 0 0 0 941 1633 5 S5T0167 DTMF DIALER FOR BINARY DATA-IN NOTES 6