Datenblatt-Suchmaschine für elektronische Bauteile |
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SA2532KB Datenblatt(PDF) 6 Page - Sames |
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SA2532KB Datenblatt(HTML) 6 Page - Sames |
6 / 21 page SA2532KA/B 6 /21 sames sames sames sames ONE COMMON GROUND Z BAL RETURN LOSS LINE V Z REF SS R2 R1 RI SIDE TONE R5 STB SYN LI Figure 3 Double balanced bridge (return loss and side tone) with one common ground Dialling Functions Valid Keys The keypad of the SA2532K comprises a maximum of 19 keys. A Bi-polar scan technique is used so that the 19 keys are scanned in a partial 4 x 6 matrix using only 8 pins and 2 diode. The key scanning is enabled when HS/DPN is pulled high and VDD is above VREF. A valid key is detected when one and only one contact closure is detected between a Row and Column Pin. Key contacts are debounced to avoid incorrect detection. It is also possible to connect a controller to the rows and columns. Dial Mode Selection The default mode (LD or MF) can be selected by the Mode pin. When default LD mode is selected, a temporary change to MF can be invoked by pressing the * key. Once in MF mode the MODE OUT pin becomes active. The circuit will revert to LD by pressing either one of the Recall keys or by next on-hook. When MF mode is selected by the mode pin, the circuit can not be changed temporary to LD but will remain in MF. In LD mode the speech circuit will be muted for the duration of the IDP. Last Number Redial LNR is a facility that allows re-signalling of the last manually dialled number without keying in all the digits again. The LNR is repeatable. A manually entered number is automatically stored in the LNR RAM. The capacity of the LNR RAM is 31 digits. If a number greater than 31 digits is entered, the LNR facility will be inhibited (Until new entries < 32 digits) and further entries will be buffered in a First In First Out Memory (FIFO). Post dialled digits, i.e. digits manually entered after LNR has been invoked, are not stored in RAM but buffered in FIFO. Pauses can be inserted by pressing the PAUSE key. Each pause is 2 seconds when inserted within the first 5 digits otherwise a wait function will halt dialling until PAUSE or LNR key is depressed. Recall Function A Recall activation will invoke a Flash (Timed Loop Break). If Recall is the first entry in a digit string, it will be stored in LNR RAM when digit(s) are entered after the Recall. If the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored but buffered in the FIFO together with subsequently entered digits. If pressing the recall key is not followed by digit entries, the LNR RAM remains intact. After a recall a 274ms second pause will automatically be executed. Both Recall keys will be functional in both MF and LD dialling modes. Memory Keys The single memory (M5) can be used to directly access a stored number of not more than 21 digits. During programming multiple pauses can be inserted by pressing the PAUSE or LNR key. Each pause is 3 seconds long when inserted within the first 5 digits otherwise a wait function (infinite pause) will be executed until the PAUSE or LNR key is depressed Mute Function The MUTE key is enabled in speech mode only. Depressing the MUTE key mutes the microphone amplifier. Repressing the MUTE key deactivates the mute (toggle function). Any key entry overwrites a mute activated by the MUTE key and mute will be deactivated. When privacy mute is activated a reminder tone is applied to the ear piece every 274ms. |
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Ähnliche Beschreibung - SA2532KB |
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