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| ST3917A ST3917B SPEECH - TONE/PULSE DIALER - LED INDICATOR . . . . . . . . . . . . . . . . . SPEECH CIRCUIT 2 TO 4 WIRES CONVERSION PRESENT THE PROPER DC PATH FOR THE LINE CURRENT AND THE FLEXIBILITY TO ADJUST IT ANDALLOWPARALLEL PHONE OPERATION SYMMETRICAL HIGH IMPEDANCE MICROPHONE INPUTS SUITABLE FOR DYNAMIC, ELECTRET OR PIEZOELECTRIC TRANSDUCER ASYMMETRICAL EARPHONE OUTPUT SUITABLE FOR DYNAMIC TRANSDUCER LINE LOSS COMPENSATION FIXED INTERNALLY BY A.G.C. INTERNAL MUTING TO DISABLE SPEECH DURING DIALING AND EXTERNAL MUTING TO DISABLE TRANSMIT AMPLIFIER DURING CONVERSATION MODE LED INDICATOR EITHER FOR KEYBOARD ILLUMINATION (OR ON-LINE INDICATION) DURING DIALING AND CONVERSATION OR FOR TONE MODE INDICATION, THROUGH MU/MFI PIN DIALER CIRCUIT STORE UP TO 32 DIGITS FOR LAST NUMBER REDIAL BUFFER, LNR IS INHIBITED IF THERE ARE MORE THAN 32 DIGITS STORED ALLOWMIXED MODE DIALING IN PULSE MODE PACIFIER TONE PROVIDES AUDIBLE INDICATION OF VALID KEY PRESSED IN A BUZZER OR/AND IN THE EARPHONE TIMED PABX PAUSE / 10PPS PULSE RATE MAKE/BREAK RATIO : 40/60 (ST3917A) AND 33/67 (ST3917B) 4 SELECTABLE OPTIONS ON FLASH DURATION AND SOFTSWITCH INHIBITION IN ONE OF THE OPTION WITH 100ms FLASH TIMING 2 SELECTABLE OPTIONS : TRANSMIT MUTE TOGETHER WITH LED FOR KEYBOARD ILLUMINATION OR LED FOR TONE MODE INDICATION CONTINUOUS TONE FOR EACH DIGIT UNTIL KEY RELEASE USES INEXPENSIVE 3.579545MHz CERAMIC RESONATOR POWERED FROM TELEPHONE LINE, LOW OPERATING VOLTAGE FOR LONG LOOP APPLICATION July 1996 DESCRIPTION The device consists of the speech and the dialer functions. It provides the DC line interface circuit that terminates the telephone line, analog amplifier for speech transmission and necessary signals for either DTMF and pulse dialing. When mated with a tone ringer, a complete telephonecan be producedwith just two ICs. TheDClineinterfacecircuit developsits ownlinevoltage acrossthedeviceandit is adjustableby externalresistor to suit different country's specification. A built-in LED driver can deliver excess line current to external LED indicator(s) during dialing and speech mode. The LED(s) can be used either for keyboard illumination purpose or for tone mode indication during softswitch and mixed mode dialing by connecting MU/MFI pin to VDDandGND oranyrowrespectively.The LEDcurrent is limited to 17mA (typical). The speech network provides the two to four wires interface,electronic switchingbetweendialingandspeechand automaticgain control on transmit and receive. The dialing network buffers up to 32 digits into the LND memorythatcan be laterredialedwith asinglekeyinput. Users can store all 13 signalling keys and access several unique functions with single key entries. These functions include : Pause, Last Number Dialled (LND), Softswitch and Flash. (see Figure 1). The FLASH key simulates a hookflash to transfercalls or to activate other special features provided by the PABX or central office. The PAUSE key stores a timed pause in the number sequence. Redial is then delayed until an outside line can be accessed or some other activities occur before normal signalling resumes. A LND key automatically redials the last number dialed. Adedicatedpin MU/MFI is used to select the muting for transmit amplifier and lighted dial LED for keyboard illumination or a LEDindicator for tonemode indication. The SEL pin allows selection of any one of the four possible Flash duration options. DIP28 (Plastic Package) ORDER CODES : ST3917AN - ST3917BN SO28 (Plastic Package) ORDER CODES : ST3917AD - ST3917BD 1/16 ST3917A - ST3917B PIN CONNECTIONS C1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 R1 R2 R3 R4 MU/MFI VDD GDTMF MIC+ MIC- C2 C3 SEL OSC PULSE MODE/PT HKS GND RXOUT GRX RXIN IREF VCC GTX REG LN 3917-01.EPS ILINE LED PIN DESCRIPTION Figure 1 : Keyboard Configuration 1 4 7 * 2 5 8 0 3 6 9 # Flas h Tone /P ulse P a us e LND 3917-02.EPS Scanning consists of Rows and Columns alternately switching high through on chip pullups. After both a Row and Column keys have been detected, the debounce counter is enabled and any noise (bouncing contacts, etc) is ignored for a debounce period (TKD) of 32ms. At this time, the keyboard is sampled and if both the Row and Column information are valid, the information is buffered into the LND location. In the tone mode, if two or more keys in the same row or if two or more keys in the same column are depressed a single tone will be output. The tone will correspond to the common row or common column for which the two keys were pushed. This feature is for test purposes, and single tone will not be redialed. Also in the tone mode, the output tone is continuous in the manual dialing as long as the key is pushed. The output tone duration follows the Table 1. When redialing in the tone mode, each DTMF output is 90ms duration, and the tone separation (inter signal delay) is 90ms. Table 1 : Output Tone Duration Key Push Time, T Tone Output T < 32ms No output, ignored by the device 32ms < T < 90ms + Tkd 90ms duration T > 90 ms + Tkd Output duration = T - tkd C1, C2, C3, R4, R3, R2, R1 (Keyboard inputs, Pins 1, 2, 3, 25, 26, 27, 28) The device interfaces with either the standard 2 of 8 with negative common or the single contact (Form A) keyboard. Column 4 of the keypad is connecting to ground. A valid keypad entry is either a single Row connected to a single Column or GND simultaneously presented to both a single Row and a single Column. In its quiescent or standby state, during normal off-hook operation, the Rows are initialized at logic level 1 (VDD) and the columns are initialized at logic level 0 (GND). Pulling any row input low enables the on chip oscillator. Keyboard scanning then begins. 2/16 ST3917A - ST3917B PIN DESCRIPTION (continued) SEL (Input, Pin 4) This is an option selectable pin for four Flash duration. The four options are summarised in the table 2. For option 1, softswitch feature is inhibited. It means redialed by the LND key in pulse mode will not repeat the softswitch and subsequent digits, only pulse digits are dialed out. Table 2 : Options Selectable for Flash Duration Options 1 2 3 4 SEL VDD GND Any Row Any Col Flash (ms) 100 600 300 100 Softswitch Inhibited Enable Enable Enable all valid key entries activate the pacifier tone. In tone mode, any non DTMF entry (FLASH, PAUSE, LND, TONE) activates the pacifier tone. The pacifier tone provides audible feedback, confirmingthat the key has been properly entered and accepted. It is a 500Hz square wave activated upon acceptance of valid key input after the 32ms debounce time. The square wave terminates after 75ms typically or when the valid key is no longer present. The pacifier tone signal is simultaneously sent to the earphone and the buzzer. The buzzer can be removed without affecting this function. The resistor value set on MODE/PT pin determines the level of the pacifier tone in the earphone. OSC (Input, Pin 5) Only one pin is needed to connect the ceramic resonator to the oscillator circuit. The other end of the resonator is connected to GND. The nominal resonator frequency is 3.579545MHz and any deviation from this standard is directly reflected in the Tone output frequencies. The ceramic resonator provides the time reference for all circuit functions. A ceramic resonator with tolerance of 0.25% is recommended. PULSE (Output, Pin 6) This is an output consisting of an open drain Nchannel device. During on-hook, pulse output pin is in high impedance and once off-hook, it will be pulled high by external resistor. MODE/PT (Input, Pin 7) Input (MODE). MODE determines the dialer's default operating mode. When the device is powered up or the hookswitch input is switched from onhook (VDD) to off-hook (GND), the default determines the signalling mode. A VDD connection defaults to tone mode operation and a GND connection defaults to pulse mode operation. When dialing in the pulse mode, a softswitch feature will allow a change to the tone mode whenever the * or softswitch key (TONE) is depressed. Subsequent * key inputs will cause the DTMF code for an * to be dialed. The softswitch will only switch from pulse to tone. The phone will be in pulse mode only after returning to on-hook and back to offhook. Redialed by the LND key will repeat the softswitch unless the softswitch redial feature is inhibited. Output (PT). Pacifier Tone Output. In pulse mode, HKS (Input, Pin 8) This is the hookswitch input to the device. It is a CMOS input with a high pull up internal resistance and must be switched high or open for on-hook operation and low for off-hook operation. A transition on this input causes the on-chip logic to initialize, terminating any operation in progress at the time. The signalling mode defaults to the mode selected at MODE/PT pin. Figures 2, 3 and 4, 5 illustrate the timing for this pin. GND (Pin 9) GND is the negative line terminal of the device.This is the voltage reference for all specifications. RXOUT, GRX, RXIN (Pins 10, 11 and 12) The receive amplifier has one input RXIN and a non inverting output RXOUT. Amplification from RXIN to RXOUT is typically 31dB and it can be adjusted between 21dB and 41dB to suit the sensitivity of the earphone used. The amplification is proportional to the external resistor connected between GRX and RXOUT. For the hearing impaired, a specific application to offer 17dB additional gain at 3kHz is permitted. IREF (Pin 13) An external resistor of 3.6k connected between IREF and GND will set the internal current level. Any change of this resistor value will influence the microphone gain, DTMF gain, earphone gain and sidetone level. VCC (Pin 14) VCC is the positive supply of the speech network. It can be stabilized by a decoupling capacitor between VCC and GND. The VCC supply voltage may also be used to supply external peripheral circuits. 3/16 ST3917A - ST3917B PIN DESCRIPTION (continued) LED (Output, Pin 15) When the MU/MFI pin is connected to either VDD or GND, the LED connected to the LED pin, which functions as a keyboard illumination or off-hook indicator, will light up when the telephone is offhook. When the MU/MFI pin is connected to anyrow pins, the LED connected to LED pin functions as a tone mode indicator. From minimum operating line current up to 20mA, ILN-ICC is sourced into the LED with a maximum current limit of 18mA. For line current more than 20mA, this sourced current is limited at 18mA (typical). ILINE (Pin 16) A recommended external resistor of 20 is connected between ILINE and GND. Changing this resistor value will influence the microphone gain, DTMF gain, sidetone, maximum output swing on LN and the DC characteristics, especially in the low voltage region. LN (Pin 17) LN is the positive line terminal of the device. REG (Pin 18) The internal voltage regulator has to be decoupled by a capacitor from REG to GND. The DC characteristics can be changed with an external resistor connected between LN and REG or between REG and ILINE. GTX, MIC-, MIC+ (Pins 19, 20, 21) The device has a symmetrical microphone inputs. The amplification from microphone inputs to LN is 51dB at 15mA line current and it can be adjusted between 43 and 51dB. The amplification is proportional to the external resistor connected between GTX and REG. GDTMF (Pin 22) When the DTMF input is enabled, the microphone inputs and the receive amplifier input will be muted and the dialing tone will be sent on the line. The voltage amplification from GDTMF to LN is 40dB. Final output level on the LN can be adjusted via the external resistor connected between GDTMF and GND through a decoupling capacitor. A confidence tone is sent to the earphone during tone dialing. The attenuation of the confidence tone from LN to RXOUT is -32dB typically. The level of the confidence tone in the earphone can be increased by adjusting the resistor connected between GDTMF and GRX pins, the possible range is 20dB. VDD (Pin 23) VDD is the positive supply for the dialing circuit and it must meet the maximum and minimum voltage requirements. MU/MFI (Input, Pin 24) A logic low input to this pin will disable the transmit amplifier of the speech circuit. MUTE efficiency is greater than 60dB. An open circuit to this pin will enable the transmit amplifier. In this case, LED is used for keypad lighting. A connection to any row will disable the transmit mute function and the LED connected to the LED pin is used for tone mode indication. Table 3 : Logic of MU/MFI Pin Indicator MU/MFI Pin OPEN GND Any Row Transmit Muting Active Muted Not Available LED at Pin 15 Lighted Dial Indicator Lighted Dial Indicator Tone Mode Indicator 4/16 R15 + LA VDD LED 15 6 4 8 7 17 D12 LN LB 1 Ri 7 MUTE Ci 24 C8 PULSE SEL HKS MODE BLOCK DIAGRAM 23 ST3917A/B PULSE INTERFACE 4 5 8 * 0 KEYBOARD INTERFACE MU/MFI OSC RAM REDIAL 2 3 6 9 # Flash Tone/Pulse Pause LND C10 ILINE/ILED CONTROL OSCILLATOR 5 VCC DTMF GENERATOR LOGIC + DAC 14 IREF Ri1 Secret 3.58MHz Ceramic 11 13 IREF GRX R14 gm GDTMF 22 gm K IREF Ri2 gm V1 I1 K IREF RGRX 10 CMF RMF K IREF MIC+ 21 RXOUT + C9 C14 gm MIC- 20 k IREF 19 16 18 12 9 GTX RGTX R21 R20 C20 ILINE REG RXIN C11 GND LN R24 R25 ST3917A - ST3917B 5/16 3917-03.EPS ST3917A - ST3917B ABSOLUTE MAXIMUM RATINGS Symbol VLN ILN VDD VI Toper Tstg Ptot Parameter Positive Line Voltage Continuous Line Current Logic Voltage Maximum Voltage on PULSE, SEL, HKS, MODE, Ri, Ci, MU/MFI and OSC Pins Operating Temperature Storage Temperature Total Power Dissipation Value 12 140 7 GND(-0.3) VDD(+0.3) -25, +70 -40, +125 700 Unit V mA V V 3917-01.TBL 3917-02.TBL C C mW ELECTRICAL CHARACTERISTICS (ILN = 10mA to 120mA, f = 1kHz, Tamb = 25C, VDD = 3V ; unless otherwise specified) Symbol VLN Parameter Line Voltage (see Figure 6) Test Conditions ILN = 4mA ILN = 15mA ILN = 120mA ILN = 15mA, RA = 68k ILN = 15mA, RB = 39k Tone mode Pulse mode VDD = 3V ILN = 15mA ILN = 10 - 20mA ILN = 20 - 120mA 10 1.5 1 100 1 1.00 0.60 0.7xVDD VMIC = 2mVRMS ILN = 15mA, RGTX = 68k ILN = 60mA, RGTX = 68k ILN = 15mA, VMIC = 2mVRMS RGTX = 43k RGTX = 27k ILN = 15mA, VLN = 1VRMS ILN = 15mA, VMIC = 0V 50 R DTMF = 2.25k, C DTMF = 22nF R DTMF = 2.25k, C DTMF = 22nF 37 -34 -72 64 39 -31.5 80 41 -29 49.5 43 -8 -4 -8 2 51 45 52.5 47 0 3 3.00 1.00 0.3xVDD 250 Tone mode Pulse mode Min. 3.15 2.60 3.60 2.50 2.00 600 300 1.3 ILNICC 24 Typ. 3.50 3.20 4.10 Max. 2.70 3.85 7.00 3.70 4.70 6.00 6.00 900 600 Unit V V V V V V V A A mA mA mA V A A mA mA mA V V dB dB dB dB dB % dBmp k dB dB VDD IDD ICC ILED VMR IMR IS Logic Voltage (see Figure 6) Supply Current into VDD (see Figure 6) Supply Current into VCC (see Figure 6) Supply Current to LED (see Figure 6) Memory Retention Voltage (see Figure 7) VDD = 3V Memory Retention Current (see Figure 7) VDD = 3V Off-Hook Standby Current (see Figure 6) VDD = 3V Pulse Output Sink Current (see Figure 6) VOUT = 0.5V Pacifier Tone Sink/Source Current (see Figure 6) HKS, Mode, Keyboard Inputs Low HKS, Mode, Keyboard Inputs High Transmit Gain (see Figure 9) VOUT = 0.5V(Sink) VOUT = 2.5V(Source) IPL IPO VIL VIH GTX AGTX Transmit Gain Variation (see Figure 9) DTX NTX ZMIC GDTMF CDTMF VDTMF Transmit Distortion (see Figure 9) Transmit Noise (see Figure 9) Microphone Input Impedance (see Figure 8) DTMF Gain (see Figure 10) DTMF Confidence Tone Attenuation (see Figure 10) DTMF level on the line (see Figure 10) High Frequency Group Low Frequency Group Pre-emphasis (see Figure 10) DTMF Output Distortion (see Figure 10) -8 -10 1 -6 -8 2 5 -4 -6 3 8 dBm dBm dB % PEI DIS 6/16 ST3917A - ST3917B ELECTRICAL CHARACTERISTICS (continued) (ILN = 10mA to 120mA, f = 1kHz, Tamb = 25C, VDD = 3V ; unless otherwise specified) Symbol ZDTMF GRX Parameter DTMF Attenuation Pin Impedance Receive gain (see Figure 11) VINP = 4mVRMS, R E = 300, RGRX=100k ILN = 15mA ILN = 60mA VINP = 4mVRMS, R E = 300, ILN = 15MA RGRX = 10K RGRX = 300k ILN = 15mA, RGRX=100k RE = 150, VEAR = 0.25VRMS RE = 300, VEAR = 0.45VRMS RE = 450, VEAR = 0.55VRMS ILN = 15mA, RE = 300 R GRX = 100k, VINP = 0V ILN = 15mA ILN = 15mA RP = RP = 430k See Figures 4 and 5 32 250 100 500 See Figures 2 and 3 5 5.55 40 90 90 See Figures 4 and 5 75 500 10 60 67 40 33 820 50 43 ms Hz PPS ms ms ms ms ms ms ms ms 1/sec ms ms ms ms Hz k 200 35 Test Conditions Min. 25 Typ. 32 Max. 39 Unit k 29.5 23.0 -20 31.0 25.0 32.5 27.0 10 dB dB dB dB dB AGRX Receive Gain Variation (see Figure 11) -20 +10 2 2 2 D RX Receive Distortion (see Figure 11) % % % V N RX ZOUT VPT Receive Noise (see Figure 11) Receive Output Impedance (see Figure 11) Pacifier Tone Level on Earphone (see Figure 11) Keyboard Interface Keypad Debounce Time Keypad Scan Frequency Keypad Pullup Resistance Keypad Pulldown Resistance Tone Mode Tone Output Rise Time Tone Signalling Rate Presignal Delay Intersignal Delay Tone Output Duration Pulse Mode Pacifier Tone Duration Pacifier Tone Frequency Pulse Rate Break Time : ST3917A ST3917B Make Time : ST3917A ST3917B Interdigital Pause Predigital Pause : ST3917A ST3917B 60 600 mVRMS mVRMS TKD FKS KRU KRD TRIS TR TPSD TISD TDUR TPT FPT PR TB TM IDP PDP Option Selectable Symbol tFLASH Notes : 1. 2. 3. 4. Parameter Timed Hook Flash (see Figures 2 and3) Option 1 SEL = VDD 100 Option 2 SEL = GND 600 Option 3 SEL = ROW 300 Option 4 SEL = COL 100 Unit ms All inputs unloaded. Quiescent mode (oscillator off). Pulse output sink current for VOUT = 0.5V at VDD = 3V. Pacifier tone sink current for VOUT = 0.5V, source current for VOUT = 2.5V at VDD = 3V. Memory retention voltage is the point where memory is guaranteed but circuit operation is not. Proper memory retention is guaranteed if either the minimum IMR is provided or the minimum VMR. The design does not have to provide both the minimum current and voltage. 5. Option 1 is with softswitch inhibition. 7/16 3917-02.TBL ST3917A - ST3917B DEVICE OPERATION During on-hook all keypad inputs are high impedance internally and it requires very low current for memory retention.At anytime,row inputs are initialized at logic level 1 and column inputs are initialized at logic level 0 at off-hook. The circuit verifies that a valid key has been entered by alternately scanning the Row and Column inputs. If the input is still valid following 32ms of debounce,the digit is stored into memory, and dialing begins after a pre-signal delay of approximately 40ms measured from the initial key closure. Output tone duration is shown in Table 1. The device allows manual dialing of an indefinite number of digits, but if more than 32 digits are dialed, LND will be inhibited. Table 4 : DTMF Output Frequencies (Hz) Key Input Row 1 Row 2 Row 3 Row 4 Column 1 Column 2 Column 3 Std Frequency 697 770 852 941 1209 1336 1477 Output Frequency 699.1 766.2 847.4 948 1215.9 1331.7 1471.9 % in Deviation +0.31 -0.49 -0.54 +0.74 +0.57 -0.32 -0.35 Last Number Dialed Off-Hook LND Last number redialing is accomplished by entering the LND key at off-hook or after the FLASH key, the subsequent LND keys pressed will be ignored. Sequence OFF-HO OK, D1, D2, ON-HOOK OFF-HOO K, LND, LND, ON-HOOK OFF-HOO K, D3, D4, LND, ON-HOOK OFF-HO OK, LND, ON-HOOK Digit Emitted D1, D2 D1, D2 D3, D4 D3, D4 Last Number Dialed Inhibition Last number redialing by LND key is inhibited if there are more than 32 digits stored. Last Number Dialed Cascading Digits dial after the LND will cascade into the LND buffer for the next redialing. In cascade operation, the keyboard is inhibited upon pressing the LND key, the LND output must be completed before acceptance of any key entry. Sequence OFF-HO OK, D1, D2, ON-HOOK Digit Emitted D1, D2 D1, D2, D3, D4 Normal Dialing D D D ... Normal dialing is straight forward, all keyboard entries will be stored in the buffer and signalled in succession. Hook Flash OFF-HOO K, LND, D3, D4, ON-HOOK D1, D2, D3, D4 OFF-HO OK, LND, ON-HOOK D Flash D ... Hook flash may be entered into the dialed sequence at any point by keying in the function key, FLASH. When a FLASH key is pressed, no further key inputs will be accepteduntilthe hookflashfunctionhasbeen dialed.The key inputfollowing aFLASH will be stored as the initial digit of the new number (overwriting the numberdialed beforethe FLASH) unless it is another FLASH. FLASHkey pressed immediatelyafterhookswitch or LND will not clear the LND buffer unless digits are entered following the FLASH key. Flash LND not cleared LND Flash LND not cleared LND Flash D1 D2 LND buffer will contain D1, D2 8/16 Pause Off-Hook D Pause D ... A pause may be entered into the dialed sequence at any point by keying in the special function key, PAUSE. Pause inserts a 3.1 seconds (Tone mode) or 3.4 seconds (Pulse mode) delay into the dialing sequence. The total delay, including predigit and post digit pauses as shown in Table 5. Table 5 : Special Function Delays Function SOFTSWITCH PAUSE First / Auto First Auto First Auto Delay (second) Pulse 0.2 1 2.6 3.4 3.0 3.1 Tone Each delay shown in Table 5 represents the time required from the time the special function key is depressed until a new digit is dialed. The time is considered "FIRST" key if all previous inputs have been completely dialed. The time is considered "AUTO" if in redial, or if previous digits dialing is still in progress. ST3917A - ST3917B DEVICE OPERATION (continued) 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) Figure 2 : Tone Mode Timing with Lighted Dial LED (Pin 24 to VDD or GND) Dial Se que nc e 1 * 1 FLAS H 3 ENTER E NTER FLASH 3 : Debounce Time ENTER 3 ENTE R Keybo ard Inp ut Keybo ard S c an DTMF Outpu t (P in 17) P ULS E Outpu t LED ON * 3 KE YBOARD S CAN 3 3 Tflas h 3917-04.EPS OFF ON 9/16 ST3917A - ST3917B Figure 3 : Tone Mode Timing with Tone Indicator (Pin 24 to any row) Dial Se quenc e 1 * 1 FLASH 3 ENTER ENTER FLASH 3 : Debounce Time ENTER 3 ENTER Keyb oard Input Keyb oard Sc an DTMF Outpu t (P in 17) P ULSE Outpu t LED ON * 3 KEYBOARD SCAN 3 3 Tflas h 3917-05.EPS OFF ON Figure 4 : Pulse Mode Timing with Lighted Dial LED (Pin 24 to VDD or GND) Dial S equ enc e 1 * 1 FLAS H 3 ENTE R E NTER FLASH 3 : De bounce Time ENTE R 3 ENTER Keyb oa rd Inp ut Keyb oa rd S ca n DTMF Outp ut (P in 17) P ULSE Outp ut LED * 3 KEYBOARD S CAN 3 3 Tflas h 3917-06.EPS ON OFF ON Figure 5 : Pulse Mode Timing with Tone Indicator Using "*" or "Tone" Key Dia l Se qu en ce 1 * 1 FLASH LND ENTER FLAS H 3 : De bounce Time E NTER LND E NTER Keyb oa rd Inp ut Keyb oa rd S ca n DTMF Outp ut (Pin 17) P ULSE Outp ut LED OFF ENTE R * 3 KEYBOARD S CAN 3 3 Tflas h 3917-07.EPS ON OFF ON 10/16 ST3917A - ST3917B Figure 6 : Test VDD C1 C2 C3 S EL OSC P ULSE VDD 2 3 7 1 ST3917A/B R1 2 8 R2 2 7 R3 2 6 R4 2 5 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/P ULSE PAUSE LND SECRET IDD Row Col 2 3 4 5 MU/MFI 2 4 * IPL mA Pulse Tone S W2 3.58MHz 100k 6 MODE/PT HKS RDTMF 470nF GDTMF 2 2 CDTMF 8 S W1 9 GND MIC+ 2 1 MIC- 2 0 1F 1F RGTX + 10 F Re RGRX 1 0 RXOUT 1 1 GRX GTX 1 9 100pF 3.9k 1 2 RXIN 1 3 IREF + 4.7 F 100pF REG 1 8 RA LN 1 7 LED ILINE 1 6 LED 1 5 20 390 390 3.9k 100 F RB 130k 600 ILED + VLN + 100 F 1 4 VCC ILN 100nF ICC 620 Figure 7 : Test VMR 1 C1 C2 C3 S EL OS C S T3917A/B R1 2 8 R2 2 7 R3 2 6 R4 2 5 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/P ULSE PAUSE LND SECRET IMR Row Col 2 3 4 470k P ulse Tone S W2 5 MU/MFI 2 4 * 3.58MHz 100k 6 7 8 P ULSE VDD 2 3 MODE/PT HKS CDTMF GND MIC+ 2 1 MIC- 2 0 GDTMF 2 2 470nF RDTMF S W1 9 1F 1F RGTX + 10 F Re RGRX 1 0 RXOUT 11 GRX GTX 1 9 + 4.7 F 100pF 3.9k 12 13 RXIN IREF VCC 100pF REG 1 8 LN 1 7 LED ILINE 1 6 LED 1 5 20 390 390 3.9k 130k + 100 F 14 100nF 620 11/16 3917-09.EPS 3917-08.EPS ST3917A - ST3917B Figure 8 : Test 1 C1 C2 C3 S EL OS C S T3917A/B R1 28 R2 27 R3 26 R4 25 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/P ULSE PAUSE LND S ECRET Row Col 2 3 4 470k P ulse Tone SW2 5 MU/MFI 24 * 3.58MHz 100k 6 7 8 P ULSE VDD 23 MODE/PT HKS CDTMF GND MIC+ 21 MIC- 2 0 RGTX GTX 1 9 + 4.7 F 1.2V GDTMF 22 470nF Imic Zmic = 1.2 Imic RDTMF S W1 9 + 10 F Re RGRX 1 0 RXOUT 1 1 GRX 100pF 3.9k 1 2 RXIN 1 3 IREF 100pF REG 1 8 LN 1 7 LED ILINE 1 6 LED 1 5 20 390 390 3.9k 130k + 100 F 1 4 VCC 100nF 620 Figure 9 : Test VDD C1 C2 C3 S EL OSC P ULSE VDD 2 3 7 1 S T3917A/B R1 2 8 R2 2 7 R3 2 6 R4 2 5 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/P ULSE PAUSE LND S ECRET Row Col 2 3 4 470k P ulse Tone S W2 5 MU/MFI 2 4 * 3.58MHz 100k 6 MODE/PT HKS RDTMF 470nF GDTMF 2 2 CDTMF GTX = 20 log Vmic VLN Vmic 8 SW1 9 GND MIC+ 2 1 MIC- 2 0 1F 1F RGTX + 10 F Re RGR X 1 0 RXOUT 1 1 GRX GTX 1 9 100pF 3.9k 1 2 RXIN 1 3 IREF + 4.7 F 100pF REG 1 8 LN 1 7 LED ILINE 1 6 LED 1 5 20 390 390 3.9k 100 F 130k 600 + VLN + 100 F 1 4 VCC ILN 100nF 620 12/16 3917-11.EPS 3917-10.EPS ST3917A - ST3917B Figure 10 : Test VDD 1 C1 C2 C3 S EL OSC ST3917A/B R1 2 8 R2 2 7 R3 2 6 R4 2 5 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/P ULSE P AUSE LND SECRET Row Col 2 3 4 470k P ulse Tone S W2 5 MU/MFI 2 4 * VMF 3.58MHz 100k 6 7 8 P ULSE VDD 2 3 MODE/PT HKS GDTMF 2 2 RDTMF 470nF S W1 9 CDTMF GND MIC+ 2 1 MIC- 20 GDTMF = 20 log 1F 1F RGTX CDTMF = 20 log + 4.7 F 1 2 RXIN 1 3 IREF VLN VMF Vear VLN + 10 F Vear Re RGR X 1 0 RXOUT 1 1 GRX GTX 19 100pF 3.9k REG 18 LN 17 100pF VLN + 100 F 130k 600 ILN + 100 F LED 1 4 VCC ILINE 16 LED 15 20 390 390 3.9k 100nF 620 Figure 11 : Test VDD C1 C2 C3 SEL OS C PULSE VDD 2 3 7 1 S T3917A/B R1 2 8 R2 2 7 R3 2 6 R4 2 5 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/P ULSE PAUSE LND SECRET Row Col 2 3 4 470k P ulse Tone S W2 5 MU/MFI 2 4 * 3.58MHz 100k 6 MODE/P T HKS RDTMF 470nF GDTMF 2 2 CDTMF GRX= 20 log Vear Vinp 8 S W1 9 10 GND RXOUT MIC+ 2 1 MIC- 2 0 1F 1F RGTX + 10 F Vear Re RGRX 1 1 GR X GTX 1 9 100pF 3.9k 1 2 RXIN 1 3 IREF + 4.7 F 100pF REG 1 8 LN 1 7 LED ILINE 1 6 LED 1 5 20 390 390 3.9k 100 F 130k + VLN + 100 F 1 4 VCC ILN Vinp 100nF 620 13/16 3917-13.EPS 3917-12.EPS ST3917A - ST3917B TYPICAL APPLICATION 2S A1013 100k 150k 3.3k 10V 5.6k 10 A HKS1 BF393 10M Options 1 2 3 C1 C2 C3 S EL OS C S T3917A/B R1 28 R2 27 R3 26 R4 25 1 4 7 2 5 8 0 3 6 9 # FLASH TONE/PULSE P AUSE LND B 1F 2.2k Ce ramic 3.58MHz DTMF P ulse HKS2 Buzzer 9 4 5 6 7 8 * SE CRE T P ULSE MODE/PT HKS GND MIC+ 21 Microphone MIC- 20 GTX 19 + 47k 10 F MU/MFI 24 VDD 23 GDTMF 22 470nF 10nF 100k 3.3k 1 8 100nF 3 4 L3240 2 7 6 5 24k 10 F + Earphone 4.7 F + 100k 10 RXOUT 11 GRX 12 RXIN 13 IRE F 14 VCC 3.6k REG 18 LN 17 ILINE 16 LED 15 Zside tone 470 F 100 F 20 5.6V + BAT42 100nF LED + 620 4.7nF 3.9k 3917-14.EPS 14/16 ST3917A - ST3917B PACKAGE MECHANICAL DATA 28 PINS - PLASTIC PACKAGE Dimensions a1 b b1 b2 D E e e3 F I L Min. Millimeters Typ. 0.63 0.45 1.27 Max. Min. Inches Typ. 0.025 0.018 0.050 Max. 0.23 0.31 37.4 16.68 2.54 33.02 14.1 4.445 3.3 0.009 0.012 1.470 0.657 0.100 1.300 0.555 0.175 0.130 DIP28.TBL 15.2 0.598 15/16 PM-DIP28.EPS ST3917A - ST3917B PACKAGE MECHANICAL DATA 28 PINS - PLASTIC PACKAGE Dimensions A a1 b b1 C c1 D E e e3 F L S Min. 0.1 0.35 0.23 Millimeters Typ. Max. 2.65 0.3 0.49 0.32 45 (Typ.) o Min. 0.004 0.014 0.009 Inches Typ. Max. 0.104 0.012 0.019 0.013 0.5 17.7 10 1.27 16.51 7.4 0.4 7.6 1.27 8 (Max.) o 0.020 18.1 10.65 0.697 0.394 0.050 0.65 SO28.TBL 0.713 0.419 0.291 0.016 0.299 0.050 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1996 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system confo rms to the I2C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 16/16 PM-SO28.EPS |
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