tone ringer s1t2410b01/b02 1 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 2 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 1 2 3 4 5 6 7 8 s1t2410b01/ v cc v cont lfi lfo output hfi hfo gnd s1t2410b02
tone ringer s1t2410b01/b02 3 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 i tr are the conditions applied to trigger to start oscillation for v sus v cc v si 4. v dis and l dis are the conditions applied to trigger to inhibit oscillation for v si v cc 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 voltage 1 v si see fig. 1 17 19 21 v initiation current 1 i si s1t2410b02 -6.8k-pin 2 to gnd 1.4 2.5 4.2 ma sustaining voltage 2 v sus see fig. 1 9.7 11.0 12.0 v sustaining current 2 i sus no load v cc = v sus , see fig. 1 0.7 1.4 2.5 ma trigger voltage 3 v trg s1t2410b01 only v cc = 15v 9.0 10.5 12.0 v trigger current 3 i trg s1t2410b01 only 10.0 20.0 1000 5 a disable voltage 4 v dis s1t2410b01 only ?? 0.8 v disable current 4 i dis s1t2410b01 only ? 40 ? 50 ? a output voltage high v oh v cc = 21v, i 8 = ? 15ma pin 6 = 6v, pin 7 = gnd 17.0 19.0 21.0 v output voltage low v ol v cc = 21v, i 8 = 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 r 3 = 191k, c 3 = 6800pf 461 512 563 hz high frequency 2 f h2 r 3 = 191k, c 3 = 6800pf 576 640 704 hz low frequency f l r 2 = 165k, c 2 = 0.47 f 9.0 10 11.0 hz
s1t2410b01/b02 tone ringer 4 characteristic curve figure 1. figure 2. s1t2410b01 supply current (no load) vs. supply voltage v cc (v), supply voltage s1t2410b02 supply current (no load) vs. supply voltage v cc (v), supply voltage
tone ringer s1t2410b01/b02 5 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 r 1 . (c 1 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 c 4 to provide a dc supply for the tone ringer chip. when this voltage exceeds the initiation (v si ), oscillation starts. with the components shown, the output frequency chops between 512 hz (f h1 ) and 640hz (f h2 ) at a 10hz (f l ) rate. the loudspeaker load is coupled through a 1300 ? to 8 ? transformer. the output coupling capacitor c 5 with transformer coupled loads is required. when driving a piezo-ceramic transducer type load, the coupling c 5 and transformer (1300 ? :8 ? ) are not required. however, a current limiting resistor is required. the low frequency oscillator oscillates at a rate (f l ) controlled by an external resistor (r 2 ) and capacitor (c 2 ). the frequency can be determined using the function f l = 1/(1.289 r 2 ? c 2 ). the high frequency oscillates at a f h1 , f h2 controlled by an external resistor (r 3 ) and capacitor (c 3 ). the frequency can be determined using the function t hi = 1/(1.504 r 3 ? c 3 ). voltage remains constant independent of r sl . pin 2 of the s1t2410b02 allows connection of an external resistor r sl , 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 (v si ). this initial voltage remains constant independent of r sl . the supply current drawn prior to triggering is inversely proportional with r sl , 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 (c 5 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 r sl . curve b (r sl = 6.8k ? ) shows the i-v characteristic for the s1t2410b02 tone ringer. curve a is a plot with r sl < 6.8k ? and shows an increase in the current drawn up to the initiation voltage v si . after initiation, the i-v characteristic remain unchanged. curve c illustrates the effect of increasing r sl above 6.8k ? initiation current decreases, but is unchanged after triggering.
s1t2410b01/b02 tone ringer 6 application circuit 1 (s1t2410b01) figure 3. s1t2410b01 application circuit application circuit 2 (s1t2410b02) figure 4. s1t2410b02 application circuit 2 3 4 5 6 7 8 1 2 3 4 1 tip c1 r1 0.9uf 560 ? ring 22uf/35v d1 29v 100k ? 200k ? r2 165k ? +1% c2 c4 0.47uf+5% c5 r3 c3 6.8nf+5% 191k ? +1% 100k ? volume 0.22uf _ + speaker 1300 ? : 8 ? 15k ? 2 3 4 5 6 7 8 1 100k ? volume c5 0.22uf r3 191k ? +1% c3 6.8nf+5% r2 165k ? +1% c2 0.47uf+5% 29v 22uf/35v c4 tip c1 r1 0.9uf 560 ? ring r sl s1t2410b02 _ + speaker 15k ? 1300 ? : 8 ?
tone ringer s1t2410b01/b02 7 equivalent circuit (pin 2 input) inhibiting oscillation figure 5. figure 6. triggering the s1t2410b01 from cmos or ttl logic figure 7. figure 8. s1t2410b01 pin2 r 2 3 4 5 6 7 8 1 s1t2410b01 2 3 4 5 6 7 8 1 s1t2410b01 +v cc r 1 v 1 i d 0 < v d < 0.5v id = > 40ua r i v d - v i v d 2 3 4 5 6 7 8 1 s1t2410b01 +12 to +15v ring ? l ? inhibit ? h ? 1/6 4049ub 10k 2 3 4 5 6 7 8 1 s1t2410b01 +12 to +24v +5v 50k ring ? l ? inhibit ? h ? 74hctls06
s1t2410b01/b02 tone ringer 8 programming the s1t2410b01 initiation supply voltage figure 9. figure 10. 2 3 4 5 6 7 8 1 s1t2410b01 +v cc i tr r e v t 20k ? |
