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IL2533N Datasheet(PDF) 5 Page - Integral Corp. |
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IL2533N Datasheet(HTML) 5 Page - Integral Corp. |
5 / 27 page IL2533 KEYBOARD CONNECTING Keyboard connecting is shown at figure 3. Key closed, RON MAX = 1 Ohm Key opened, ROFF MIN = 1 Ohm P/M 1 2 3 4 5 6 7 8 9 0 * # R1 R2 R3 LNR VOL + - A B C D RP PS T/P M1 M2 M3 M4 MR C1 C2 C3 C4 R1 R2 R3 R4 Figure 3 – Keyboard connecting Power-up set up On-chip voltage on preset circuit traces supply voltage VDD during receiver off-hook. When VDD increase reaches level approximately 1.2 V, preset circuit empties RAM. Direct current conditions Typical operational range is from 13 to 100 mА. Operational range by lowered effectiveness is from 5 to 13 mА (parallel operation). In operational range all functions are active. By line currents lower than 13 mА microcircuit provides additional decrease lower than 4.5 V in order to allow parallel operation (see fig. 4). Direct current characteristic (excluding diode bridge) determining by voltage to LI and R1 resistor by line currents higher than 13 mА by following form: VLS = VLI + ILINE × R1 (1). Voltage at LI is 4.5 V in typical operational range. In dialing mode, speech scheme and inactive device parts is in mode of decreased power consumption with the purpose of current saving. CS output pulls up to Vss in order to connect outer shunting transistor for supporting of low voltage at LS output within periods forming. IMPEDANCE FOR ALTERNATING CURRENT Circuit impedance on alternating current is adjusting by outer components. Impedance can be actual and complex. Alternating-current resistance ZAC, Ohm, is determining according to following form ZAC = 33 × Z1 5 |
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