WE9148

The WE9148 has the following features including Tonelpulse switchable;19 repertory 16-digit memories for direct dialing;One 32-digit memory for the last number redial;Both key-in debounce and key-released debounce are 20ms;Minimum tone duration=100ms for rapid key-in in normal dialing;PAUSE key for PABX operation; 3.5 sec per pause, stackable and can be released by any key during auto-dialing.

The WE9148 series are TONEIPULSE switchable telephone dialers with 19 repertory 16-digit memories for direct dialing and one 32-digit last-number-redial memory.For PABX operation, PAUSE, P->T and FLASH keys are Implemented. Pause time is 3.5 sec, stackable and can be released by any key in auto-dialing. The P->T which will change the pulse mode into tone mode also provides 3.5 sec pause time, which is stackable and can be released by any key during the auto-dialing.The keypads inputs compatible with the standard 2 of 12 keyboard. The keypad debounce method will be acceptable only if it lasts longer than 20ms, and the next keyin will be unacceptable unless the key has been released longer than 20ms. In normaloperaiton, any single button is pushed to produce dual tone, pulses, or function.
 
This pin of the WE9148 is used to output DTMF address code. During pulse mode, it keeps in low state. In tone mode, it will output dual or single tone(See TABLE 2). In  normal dialing, the tone duration depends on key-in  duation.  When  keypad  is  pressed less  than  100ms,  the tone  duration will be fixed to 100ms. In opposite, the tone duration will last as long as key is pressed. In auto-dialing, the tone duration and inter-tone-pause are interrnally set to 100ms and  106ms respectively. After above operation, but busy, the excute redial operation the signal will be dialed out automatically as same sequence of dialing with Pulse to Tone key,but has a 3.5sec pause during changing mode.This pin is a CMOS inveter output which will be pulled high only in tone duration, and keeps low in the other state. It can be used to mute the speech circuit in tone mode or control a LED to indicate the tone duration.