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SA2532CP Datasheet(PDF) 7 Page - Sames |
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SA2532CP Datasheet(HTML) 7 Page - Sames |
7 / 22 page sames SA2532 7/22 Microcontroller Interface The keypad Row and Column Pins can readily be driven by a Microcontroller Interface. When configured in this way the SA2532 inputs and dials the corresponding digits in either LD or DTMF. The LNR store can be used to buffer digits to allow high speed data entry. See Application Note AN3002A for details. Tone Ringer The Tone Ringer of the SA2532 incorporates a Discriminator Circuit and adjustable Melody Generator Ring Frequency Discrimination The Ring Frequency Discriminator assures that only signals with a frequency between 20Hz and 60Hz (option 13 Hz to 60 Hz) are regarded as valid ring signals. When a valid ring signal is present for 73ms continuously, the melody generator is activated and remains active as long as the ring signal is present. Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or unvalid ring signal respectively (until next POR or off-hook). Melody Generator When a Valid Ring Signal is detected the Melody generator is activated and creates a ringing Signal comprising 3 frequencies F1 (1065Hz), F2 (1420Hz) and F3 (1734Hz). These frequencies are repeated in a sequence of 6 time slots constructed by the frequencies F1 F2 F3 F1 F2 F3 This sequence is repeated 1, 4, 7 or 10 times per second as indicated by the connection of the RR Pin to one of the four rows of the keyboard. |
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