PDF L3914A Data sheet ( Hoja de datos )

Número de pieza	L3914A
Descripción	(L3914A - L3934A) SPEECH AND 14 MEMORY DIALER
Fabricantes	ST Microelectronics
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No Preview Available ! www.DataSheet4U.com L3914A L3924A - L3934A SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION ADVANCE DATA SPEECH CIRCUIT 2 TO 4 WIRES CONVERSION PRESENT THE PROPER DC PATH FOR THE LINE CURRENT AND THE FLEXIBILITY TO ADJUST IT AND ALLOW PARALLEL PHONE OPERATION PROVIDES SUPPLY WITH LIMITED CUR- RENT FOR EXTERNAL CIRCUITRY SYMMETRICAL HIGH IMPEDANCE MICRO- PHONE INPUTS SUITABLE FOR DYNAMIC ELECTRET OR PIEZOELECTRIC TRANSDUCER ASYMMETRICAL EARPHONE OUTPUT SUITABLE FOR DYNAMIC TRANSDUCER LINE LOSS COMPENSATION INTERNAL MUTING TO DISABLE SPEECH DURING DIALING HOLD FUNCTION FOR PARALLEL PHONE WITH 400ms DELAY TO PREVENT FALSE RELEASE DIALER CIRCUIT 32 DIGITS FOR LAST NUMBER REDIAL BUFFER 18 DIGITS FOR 13 MEMORY REDIAL ALLOW MIXED MODE DIALING IN EITHER TONE OR PULSE MODE PACIFIER TONE PROVIDES AUDIBLE INDI- CATION OF VALID KEY PRESSED IN A BUZZER OR/AND IN THE EARPHONE TIMED PABX PAUSE FLASH INITIATES TIMED BREAK: MASK OPTIONS WITH 585ms,300ms,100ms CONTINUOUS TONE FOR EACH DIGIT UN- TIL KEY RELEASE USES INEXPENSIVE 3.579545MHz CE- RAMIC RESONATOR POWERED FROM TELEPHONE LINE, LOW OPERATING VOLTAGE FOR LONG LOOP APPLICATION DIP28 SO28 ORDERING NUMBERS: L3914AN L3914AD L3924AN L3924AD L3934AN L3934AD PIN CONNECTION (Top view) KEYPAD CONFIGURATION DESCRIPTION The device consists of the speech and the dialer. It provides the DC line interface circuit that termi- nates the telephone line, analog amplifier for speech transmission and necessary signals for either DTMF or loop disconnect (pulse) dialing. Note: PAUSE/LND: PAUSE and LND functions are sharing the same key with different sequence. Hereafter, PAUSE and LND keys arereferring to the same key. January 1995 1/15 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 1 page L3914A - L3924A - L3934A FUNCTION PIN DESCRIPTION (continued) To dial a number from repertory memory (HKS must be low), enter the following: MEM (Location 0-9) or E1-E3 To save the last number dialed, enter the follow- ing: PROG MEM (location 0-9) or E1-E3 HOOK FLASH D1 FLASH D2 ...etc Hook flash may be entered into the dialed se- quence at any point by keying in the function key, FLASH. Flash consists of a timed break of 585ms, 300ms or 100ms depending on the Mask option. When a FLASH key is pressed, no further key inputs will be accepted until the hookflash function has been dialed. The key input following a FLASH will be stored as the initial digit of the new number, overwriting the number dialed be- fore the FLASH, unless it is another FLASH. FLASH key pressed immediately after hookswitch or LND will not clear the LND buffer unless digits are entered following the FLASH key. Example: FLASH LND not cleared LND FLASH LND not cleared LND FLASH D1 D2 LND buffer will contain D1, D2 PAUSE/LAST NUMBER DIALED If the PAUSE/LND key is pressed right after off hook or FLASH key, it is considered as LND, if it is pressed after a digit, it will be considered as PAUSE. LAST NUMBERED DIALED OFF-HOOK PAUSE/LND or FLASH PAUSE/LND Last number dialing is accomplished by entering the PAUSE/LND key. PAUSE OFF-HOOK D1 PAUSE/LND D2 ...etc A pause may be entered into the dialed sequence at any point by keying in the special function key, PAUSE/LND. Pause inserts a 3.1 second delay into the dialing sequence. The total delay, including pre- digit and post-digit pauses is shown in Table 3. Table 3: Special Function Delays Each delay shown below represents the time re- quired after the special function key is depressed until a new digit is dialed. The time is considered ”FIRST” key if all previous inputs have been com- pletely dialed. The time is considered ”AUTO” if in redial, or if previous dialling is still in progress. Function First/Auto SOFTSWITC H PAUSE FIRST AUTO FIRST AUTO Delay (seconds) Pulse To ne 0.2 1.0 2.6 3.0 3.4 3.1 HOLD When HOLD key is pressed during off hook, there are two options. The first option is to mute the phone (LED will blink) and the conversation can be resumed by pressing the HOLD key again. The second option is to mute the phone (LED will blink), on-hook the phone (LED will still blink at 1Hz frequency) and automatic switch off the phone when parallel phone is off-hook. The HOLD function is disabled when the line cur- rent drops below 20mA. SOFTSWITCH FUNCTION USING TONE/PULSE MODE SWITCH When dialing in Pulse mode after off-hook, switch- ing TONE/PULSE mode switch from Pulse to Tone will cause the device to change the signaling mode into tone signal and store the softswitch function in the LND memory for redial. To redial the softswitch function (mixed mode dialing) in the pulse mode af- ter going on-hook and back to off-hook, you have to switch the TONE/PULSE mode switch back to pulse mode either before going on-hook or after off- hook or during on-hook. Subsequentmode change from Tone to Pulse will change the signaling mode to pulse dialing se- quence but this mode change will not be stored in .the LND memory. When dialing in Tone mode after off-hook, a switch- ing of TONE/PULSE mode Switch from Tone to Pulse will cause the device to change the signaling mode into pulse mode but this mode change will not be stored in the LND memory. When LND key is pressed in Tone mode after going off-hook, the device will output all tone signals. A pacifier tone of 75ms is provided after 32ms deboun ce time when switching from Pulse to Tone mode. Redial by the LND key will repeat the mixed dial- ing sequence in Pulse mode. 5/15 5 Page TEST CIRCUITS(continued) Figure 7. 470nF 2.25K GDTMF 22 4.0V 22nF VMF IDD RDTMF VDD 470K PULSE 3.58MHz OSC PULSE TONE SW2 MODE 100K /PT HKS SW1 GND 300Ω 10µF Re Vear RXOUT 100K GRX RGRX IREF 3.6K VCC 100µF RGIN 23 6 5 7 8 9 10 11 13 14 12 620Ω 100nF Figure 8. 470nF 2.25K GDTMF 22 IDD 22nF 4.0V 470K 3.58MHz SW2 PULSE TONE 100K SW1 RP Re 10µF RGRX Vear 3.6K 100µF VDD PULSE OSC MODE /PT HKS GND 23 6 5 7 8 9 RXOUT GRX 10 11 IREF 13 VCC RGIN 14 12 620Ω Vinp 100nF L3914A - L3924A - L3934A C4 4 C3 3 C2 2 C1 1 28 R1 R2 27 R3 26 R4 25 R5 24 VLN GDTMF=20log VMF Vear CDTMF=20log VLN 1 2 3 FLASH 4 5 6 PROG 7 8 9 P/LND * 0 # HOLD E1 E2 E3 MEM MIC+ 21 2.2K 1µF MIC- 20 GTX 19 1µF RGTX 88K 4.7µF REG 18 LN 17 VLN LED 15 ILED 16 ILINE 390Ω 130K 3.9K 100µF IL 20Ω 390Ω 600Ω D95TL173 C4 4 C3 3 C2 2 C1 1 R1 28 R2 27 R3 26 25 R4 R5 24 Vear GRX=20log Vinp NRX with Vin=0 1 2 3 FLASH 4 5 6 PROG 7 8 9 P/LND * 0 # HOLD E1 E2 E3 MEM MIC+ 21 2.2K 1µF MIC- 20 GTX 19 1µF RGTX REG 18 LN 17 4.7µF VLN LED 15 ILED 16 ILINE 390Ω 130K 3.9K 100µF IL 20Ω 390Ω D95TL167 11/15 11 Page

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