DS_S1T2410B01 SAMSUNG | Alldatasheet

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Technical content

TONE RINGER S1T2410B01/B02 INTRODUCTION 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 Package Operating Temperature S1T2410B01-D0B0 8-DIP-300 −45°C to +65°C S1T2410B02-D0B0 8−DIP−300

S1T2410B01/B02 TONE RINGER PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Supply Voltage V CC 30 V Power Dissipation P D 400 mW Operating Temperature T OPR − 45 to +65 °C Storage Temperature T STG −65 to +150 °C 4 5 S1T2410B01/ VCC VCONT LFI LFO OUTPUT HFI HFO GND S1T2410B02

TONE RINGER S1T2410B01/B02 ELECTRICAL CHARACTERISTICS (Ta = 25°°°°C) (All voltage referenced to GND unless otherwise specified) NOTES: (see electrical characteristics sheet) 1. Initial supply voltage (V SI) is the supply voltage required to start tone ringer oscillation 2. Sustaining voltage (V SUS) is the supply voltage required to maintain oscillation. 3. V TR and ITR are the conditions applied to trigger to start oscillation for VSUS ≤ VCC ≤ VSI 4. V DIS and lDIS are the conditions applied to trigger to inhibit oscillation for VSI ≤ VCC 5. Trigger current must be limited to this value externally. Characteristic Symbol Test Conditions Min. Typ. Max. Unit Operating Voltage V CC −− − 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 1000 5 µA Disable Voltage4 VDIS S1T2410B01 Only −− 0.8 V Disable Current4 IDIS S1T2410B01 Only −40 −50 −µ A Output Voltage High V OH VCC = 21V, I8 = −15mA Pin 6 = 6V, Pin 7 = GND 17.0 19.0 21.0 V Output Voltage Low V OL VCC = 21V, I8 = 15mA Pin 6 = GND, Pin 7 = 6V −− 1.6 V Input Current 1 (Pin 3) I I (PIN 3) Pin 3 = 6V, Pin 4 = GND −− 500 nA Input Current 2 (Pin 7) I I (PIN 7) Pin 7 = 6V, Pin 6 = GND −− 500 nA High Frequency 1 f H1 R3 = 191K, C3 = 6800pF 461 512 563 Hz High Frequency 2 f H2 R3 = 191K, C3 = 6800pF 576 640 704 Hz Low Frequency f L R2 = 165K, C2 = 0.47µF 9.0 10 11.0 Hz

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 C 1 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 SI). 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 R SL, 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. R SL 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.

Figure 9. Figure 10.