Datenblatt-Suchmaschine für elektronische Bauteile |
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ST3917B Datenblatt(PDF) 9 Page - STMicroelectronics |
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ST3917B Datenblatt(HTML) 9 Page - STMicroelectronics |
9 / 16 page Led Indicator / Tone Mode Indication When the MU/MFI (Pin 24) is connected to any row of the keypad input, the LED connected to Pin 15 (LED) becomes a Tone mode indicator. The LED indicator is used in the following conditions : - At Tone mode, LED will light up at off-hook. The LED will turn off only when the telephone goes on-hook. Example : Tone mode OFF-HOOK (LED turns on) <TONE> D1, D2, D3 ON-HOOK (LED turns off) OFF-HOOK (LED turns on) <TONE> LND ON-HOOK (LED turns off) - At Pulse mode after off-hook, LED is off during pulse dialing. When dialing is followed by the ”*” or ”TONE” softswitch key depressed, the LED will light up immediately at the softswitch after pulse dialing is completed to indicate the signalling mode change from pulse to tone. After returning to on-hook and back to off-hook, the device will be in pulse mode and then LED is turned off. Redialing from LND memory buffer will repeat the softswitch, i.e. mixed mode redialing, the LED will light up to indicate the switch to tone mode or tone dialing. The LED will turn off only when the telephone goes on-hook or is reset by the Flash key Examples : Pulse mode a) OFF-HOOK (LED is off) <Pulse> D1, D2 (LED remains off),”*” <Tone> (LED turns on), D3, D4 ON-HOOK or Flash (LED turns off) b) OFF-HOOK (LED is off) <Pulse> LND <Pulse> D1, D2 (LED remains off), ”*” <Tone> (LED turns on) D3, D4, ON-HOOK or Flash (LED turns off) - At Pulse mode, after off-hook, LED is off during pulse dialing. When switching the Tone/Pulse me- chanical switch to Tone mode, LED will turn on. Example : Pulse mode OFF-HOOK (LED is off) <Pulse> D1, D2 Switch ”Tone/Pulse” mechanical switch to Tone mode (LED turns on) <Tone> D3, D4, ON-HOOK (LED turns off) The function of the LED for Tone mode indicator is described in the timing waveform in Figures 2, 3, 4 and 5. DEVICE OPERATION (continued) Ke ybo a rd Sc a n DTMF Outpu t (P in 17) P ULS E Outpu t LED Ke ybo a rd Inp ut ON OFF ON Tflas h 3 3 3 KE YBOAR D S CAN 1 FLAS H * 3 ENTE R ENTER E NTER ENTER Dial Se que nc e 1 * FLASH 3 3 : De bounce Time Figure 2 : Tone Mode Timing with Lighted Dial LED (Pin 24 to VDD or GND) ST3917A - ST3917B 9/16 |
Ähnliche Teilenummer - ST3917B |
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Ähnliche Beschreibung - ST3917B |
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