TONE RINGER S1T2410B01/B02 INTRODUCTION 8−DIP−300 The S1T2410B01/B02 is a bipolar integrated circuit designed as a telephone bell replacement. FUNCTIONS • Two oscillators • Output amplifier • Power supply control circuit FEATURES • Designed for telephone bell replacement • Low drain current • Small size MINIDIP package • Adjustable 2-frequency tone • Adjustable warbling rate • Built-in hysteresis prevents false triggering and rotary dial ‘CHIRPS’ • Extension tone ringer modules • Alarms or other alerting devices • External triggering or ringer disable (S1T2410B01) • Adjustable for reduced initial supply current (S1T2410B02) ORDERING INFORMATION Device S1T2410B01-D0B0 S1T2410B02-D0B0 Package Operating Temperature 8-DIP-300 −45°C to +65°C 1 S1T2410B01/B02 TONE RINGER PIN CONFIGURATION VCC 1 VCONT 2 LFI LFO 8 OUTPUT 7 HFI 3 6 HFO 4 5 GND S1T2410B01/ S1T2410B02 ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Supply Voltage VCC 30 V Power Dissipation PD 400 mW Operating Temperature TOPR − 45 to +65 °C Storage Temperature TSTG −65 to +150 °C 2 TONE RINGER S1T2410B01/B02 ELECTRICAL CHARACTERISTICS (Ta = 25°°C) (All voltage referenced to GND unless otherwise specified) Characteristic Symbol Test Conditions Min. Typ. Max. Unit Operating Voltage VCC − − − 29.0 V Initiation Voltage1 VSI See Fig. 1 17 19 21 V Initiation Current1 ISI S1T2410B02 -6.8K-Pin 2 to GND 1.4 2.5 4.2 mA Sustaining Voltage2 VSUS See Fig. 1 9.7 11.0 12.0 V Sustaining Current2 ISUS No Load VCC = VSUS, See Fig. 1 0.7 1.4 2.5 mA Trigger Voltage3 VTRG S1T2410B01 Only VCC = 15V 9.0 10.5 12.0 V Trigger Current3 ITRG S1T2410B01 Only 10.0 20.0 10005 µA Disable Voltage4 VDIS S1T2410B01 Only − − 0.8 V Disable Current4 IDIS S1T2410B01 Only −40 −50 − µA Output Voltage High VOH VCC = 21V, I8 = −15mA 17.0 19.0 21.0 V − − 1.6 V Pin 6 = 6V, Pin 7 = GND Output Voltage Low VOL VCC = 21V, I8 = 15mA Pin 6 = GND, Pin 7 = 6V Input Current 1 (Pin 3) II (PIN 3) Pin 3 = 6V, Pin 4 = GND − − 500 nA Input Current 2 (Pin 7) II (PIN 7) Pin 7 = 6V, Pin 6 = GND − − 500 nA High Frequency 1 fH1 R3 = 191K, C3 = 6800pF 461 512 563 Hz High Frequency 2 fH2 R3 = 191K, C3 = 6800pF 576 640 704 Hz Low Frequency fL R2 = 165K, C2 = 0.47µF 9.0 10 11.0 Hz NOTES: (see electrical characteristics sheet) 1. Initial supply voltage (VSI) is the supply voltage required to start tone ringer oscillation 2. Sustaining voltage (VSUS) is the supply voltage required to maintain oscillation. 3. VTR and ITR are the conditions applied to trigger to start oscillation for VSUS ≤ VCC ≤ VSI 4. VDIS and lDIS are the conditions applied to trigger to inhibit oscillation for VSI ≤ VCC 5. Trigger current must be limited to this value externally. 3 S1T2410B01/B02 TONE RINGER CHARACTERISTIC CURVE S1T2410B01 Supply Current (No Load) Vs. Supply Voltage VCC (V), Supply Voltage Figure 1. S1T2410B02 Supply Current (No Load) Vs. Supply Voltage VCC (V), Supply Voltage Figure 2. 4 TONE RINGER S1T2410B01/B02 APPLICATION INFORMATION The application circuit illustrates the use of the S1T2410B01/B02 devices in typical telephone or extensive tone ringer applications. The AC ringer signal voltage appears across the TIP and RING inputs of the circuit, and is attenuated by capacitor C1 and resistor R1. (C1 also provides isolation from DC voltages (48V) on the exchange line). After full wave rectification by the bridge diode, the wave form is filtered by capacitor C4 to provide a DC supply for the tone ringer chip. When this voltage exceeds the initiation (VSI), oscillation starts. With the components shown, the output frequency chops between 512 Hz (fH1) and 640Hz (fH2) at a 10Hz (fL) rate. The loudspeaker load is coupled through a 1300Ω to 8Ω transformer. The output coupling capacitor C5 with transformer coupled loads is required. When driving a piezo-ceramic transducer type load, the coupling C5 and transformer (1300Ω :8 Ω) are not required. However, a current limiting resistor is required. The low frequency oscillator oscillates at a rate (fL) controlled by an external resistor (R2) and capacitor (C2). The frequency can be determined using the function fL = 1/(1.289 R2 • C2). The high frequency oscillates at a fH1, fH2 controlled by an external resistor (R3) and capacitor (C3). The frequency can be determined using the function tHI = 1/(1.504 R3 • C3). Voltage remains constant independent of RSL. Pin 2 of the S1T2410B02 allows connection of an external resistor RSL, which is used to program the slope of the supply current vs supply voltage characteristics (see Fig. 2) and hence the supply current up to the initial voltage (VSI). This initial voltage remains constant independent of RSL. The supply current drawn prior to triggering is inversely proportional with RSL, decreasing for an increasing value of resistance. Thus, increasing the value of RSL, will decrease the amount of AC ringing current required to trigger the device. Longer subscriber loops are possible since less voltage is dropped per unit length of loop wire due to the lower current level. RSL can also be used to compensate for smaller AC coupling capacitors (C5 on Fig. 3) (higher impedance) to the line which is used to alter the ringer equivalence number of a tone ringer circuit. The graph in Fig. 2 illustrates the variation of supply current with supply voltage of the S1T2410B02. Three curves are drawn to show the variation of the initiation current with RSL. Curve B (RSL = 6.8kΩ) shows the I-V characteristic for the S1T2410B02 tone ringer. Curve A is a plot with RSL < 6.8kΩ and shows an increase in the current drawn up to the initiation voltage VSI. After initiation, the I-V characteristic remain unchanged. Curve C illustrates the effect of increasing RSL above 6.8kΩ initiation current decreases, but is unchanged after triggering. 5 S1T2410B01/B02 TONE RINGER APPLICATION CIRCUIT 1 (S1T2410B01) TIP C1 R1 0.9uF 560Ω _ + 1 1 2 2 RING 8 C5 0.22uF 100KΩ VOLUME 7 100K — 200KΩ C4 22uF/35V 3 3 D1 29V R2 6 R3 191KΩ +1% C3 4 4 5 6.8nF+5% 165KΩ +1% 15KΩ C2 0.47uF+5% SPEAKER 1300Ω : 8Ω Figure 3. S1T2410B01 Application Circuit APPLICATION CIRCUIT 2 (S1T2410B02) TIP + 1 8 7 2 RING S1T2410B02 29V RSL C4 22uF/35V 3 R2 6 C5 0.22uF 100KΩ VOLUME R3 191KΩ +1% C3 4 5 6.8nF+5% 165KΩ +1% C2 0.47uF+5% 15KΩ C1 R1 0.9uF 560Ω _ SPEAKER 1300Ω : 8Ω Figure 4. S1T2410B02 Application Circuit 6 TONE RINGER S1T2410B01/B02 EQUIVALENT CIRCUIT (Pin 2 Input) INHIBITING OSCILLATION +VCC S1T2410B01 1 8 1 8 2 7 ID 7 2 S1T2410B01 PIN2 S1T2410B01 3 6 4 5 R1 3 6 4 5 R V1 VD 0 < VD < 0.5V ID = Figure 5. Triggering The S1T2410B01 From CMOS or TTL Logic > 40uA +12 to +24V +5V Inhibit “H” 1/6 4049UB RI Figure 6. +12 to +15V Ring “L” VD - VI 1 8 2 7 10K S1T2410B01 3 6 4 5 Figure 7. Ring “L” Inhibit “H” 74HCTLS06 50K 1 8 2 7 S1T2410B01 3 6 4 5 Figure 8. 7 S1T2410B01/B02 TONE RINGER PROGRAMMING THE S1T2410B01 INITIATION SUPPLY VOLTAGE VSI +VCC VZ ITR 1 8 2 7 RE RE 2 7 S1T2410B01 3 6 4 5 3 6 4 5 VT VCC-11.5 10 Figure 9. 8 8 S1T2410B01 VT 20KΩ<RE< 1 MΩ VSI=VT+VZ+20RE (RE in MΩ) Figure 10.