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U3900BM-AFNG3 Datasheet(PDF) 10 Page - TEMIC Semiconductors |
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U3900BM-AFNG3 Datasheet(HTML) 10 Page - TEMIC Semiconductors |
10 / 34 page U3900BM Rev. A2, 25-Aug-98 Target Specification 10 (34) 2.2.8 SCWID: Overview 14608 EGT Alert signal high-frequency logic part Alert signal low-frequency logic part Analog filter Analog filter 2130 Hz 2750 Hz UGT DGT FC Time guard Command bits CDE < 0...8 > from serial bus Wetting pulse W pulse Alert To interrupt system CLASS signal To CLID FSK filter Figure 8. Alert detection General information: All the control bits provided for the SCWID function can be modified at any time with the microprocessor. 2.2.9 CAS Detect Process Typical application: The incoming signal from the CO is not polluted with speech or music. (The feature early guard time is not used) Choice of 4 DGT values Down guard time Interrupt to the µP CAS signal duration: 80 ± 5 ms frequencies: 2130 Hz + 2750 Hz Interrupt to the µP Up guard time Choice of 4 UGT values IN SCWID detector OUT SCWID detector 14609 Figure 9. Timing diagram of standard alert detection If any drop in the CAS signal occurs before the end of the UGT specified value, then the time counter restarts and the OUT SCWID detector remains low. If any spike in the blank signal occurs before the end of the DGT specified value, then the time counter restarts and the OUT SCWID detector remains high. |
Similar Part No. - U3900BM-AFNG3 |
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Similar Description - U3900BM-AFNG3 |
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