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SA2531 A/B/C/E/G/U
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FEATURES s Speech circuit, LD/MF Repertory Dialler and Tone Ringer on one 28 pin CMOS chip
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SA2531 A/B/C/D/E/F/G/J/U
VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER
Operating range from 13 to 100 mA (down to 5 mA with reduced performance) Volume control of receive signalExcept "D") Low noise (max. -72dBmp) Real or Complex impedance on chip programmable LD/MF switchable dialling 14 memories, 4 direct/10 indirect or 10 direct Pause key for 2, 3 or 6 sec Auto Pause or Wait function On chip MF filter (CEPT CS 203 compatible) 3-tone melody generator
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Net 4 compatible Soft clip to avoid harsh distortion Line Loss Compensation selectable by pin option Power down mode Versatile applications for different PTT demands 31 digit last number redial Sliding Cursor protocol with comparison 2 Flash keys, 100 ms and 280 ms (option 600 ms) Ring frequency discrimination
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GENERAL DESCRIPTION The SA2531 is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. The device incorporates LD/MF repertory dialling, melody generation, ring frequency discrimination and a high quality speech circuit. A RAM is on chip for a 31 digit last number redial and 14 memories each containing up to 21 digits. The sliding cursor procedure makes Last Number Redial easy behind a PABX. The SA2531 (exept the SA2531D) incorporates a volume control for the earpiece. The receive volume can be controlled by the VOL key (+4dB) or by the +/- keys (+6dB/-4dB in 5 steps). The versatility of the circuit is provided by on chip programmability and a few external components. This allows easy adaption to different PTT requirements without changing the PCB of the telephone.
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M82-2013 PDS039-SA2531-001 Rev.D
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SA2531 A/B/C/E/G/U PACKAGE Available in 28 pin DIP and PLCC PIN CONFIGURATIONS 28 Pin PLCC 28 Pin DIP
PIN DESCRIPTION Pin# Symbol Function 23 M1 Microphone Inputs 24 M2 Differential inputs for the microphone (electret). 3 RO1 Receiver Outputs 2 RO2 These are the outputs for driving a dynamic earpiece with an impedance of 150 to 300 5 AGND Analogue Ground This is the analog ground for the amplifiers. 28 RI Receive Input This is the input for the receive signal. 6 STB Side Tone Balance Input This is the input for side tone cancellation. 1 LS Line Current Sense Input This is the input for sensing the line current. 27 LI Line Input This input is used for power extraction and line current sensing.
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SA2531 A/B/C/E/G/U
Pin# Symbol Function 25 CS Current Shunt Control Output This N-channel open drain output controls the external high power shunt transistor for the modulation of the line voltage and for shorting the line during make period of pulse dialling. 4 VDD Positive Voltage Supply This is the supply pin for the circuit. 26 VSS Negative Power Supply 8 MO Melody Output Pulse Density Modulated output of the melody generator for tone ringer. At high impedance when not active. 21 FCI Frequency Comparator Input This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook. 10 HS/DP Hook Switch Input and Dial Pulse Output This is an I/O that is pulled high by the hook switch when off- hook. An open drain pulls it low during break periods of pulse dialling and flash. 11 OSC Oscillator Input Oscillator pin for Xtal or ceramic resonator (3.58 MHz). Recommended part is the Murata CSA3.5MG312AM. 9 LLC Line Loss Compensation Select pin for the loss compensation. OPEN = None VDD = 45-75mA VDD = 20-50mA 12 RR Repetition Rate Select pin for repetition rate of melody for the Tone rinser. 22 MODE Signalling Mode Select Input Mode pin Function High LD mode, 10pps, M:B = 33:66 (J:20pps) Open MFonly Low LD mode, 10pps, M:B = 40:60 (J:20pps, M:B = 33:66) 20 19 18 17 16 15 14 13 7 R1 R2 R3 R4 C1 C2 C3 C4 CI Keyboard Rows
Keyboard Columns
Complex Impedance Input Input pin for the capacitor in the complex impedance
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SA2531 A/B/C/E/G/U
FUNCTIONAL DESCRIPTION Power On Reset The on chip power on reset circuit monitors the supply voltage (VDD ). When VDD rises above approx. 1.2V, a power on reset occurs to assure correct start-up and the RAM is cleared. DC Conditions The normal operating range is from 13mA to 100 mA. Operating range with reduced performance is from 5mA to 13mA. In the operating range all functions are operational. At line currents below 13mA the SA2531 provided an additional scope below 4.5V to allow parallel operation. (See Figure 12). The dc characteristic (excluding diode bridge and Pulsing transistors) is determined by the voltage at LI and the resistor R1 as follows: VLS = VLI + ILine.R1 The voltage at LI is 4.5V. During pulse dialling the speech circuit and other parts of the device not required are in a power down mode to save current. The CS pin is pulled to VSS in order to turn the external shunt transistor on to keep a low voltage drop at the LS pin during make periods. AC Impedance The Characteristic or Output impedance of the SA2531 is set within the IC and adjusted by Mask Options. Available options are for 600 and 1000. When the 1000 option is selected then a capacitor may be added to the circuit at pin CI to add a reactive element and make the output impedance complex. Oscillator All the Timing Functions of the SA2531 are based on a Clock Frequency of 3.58MHz. A crystal or ceramic resonator of this frequency should be connected to the OSC pin. In practise minor deviations from the nominal frequency may occur due to the characteristics of the frequency reference device used and so it is recommended that care is taken in the selection of components. Typically a small value capacitor ( 47pF) should be connected in parallel with the Frequency Reference to ensure start-up and/or operation at the nominal frequency. Speech Circuit The speech circuit consists of a transmit and a receive path born with soft clip, mute, line loss compensation and side tone cancellation. Transmit The gain of the transmit from M1/M2 to LS is 35dB for 600 versions and 37dB for 1000 versions (see test circuit figure 5). The microphone input is differential with an input impedance of 25 k. The soft clip circuit limits the output voltage at LI to 2.0V PEAK (see figures 8 & 9). The attack time is 30s/6dB and the decay time is 20 ms/6 dB. When mute is active, during dialling
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SA2531 A/B/C/E/G/U or after pressing the MUTE key, the gain is reduced by > 60 dB. Receive The receive input is the differential signal of RI and STB. The gain of the receive path is 2 dB (test circuit figure 5) with differential outputs, RO1/RO2 (0dB on 1000 versions). When mute is active during dialling the gain is reduced by > 60dB. During DTMF dialling a MF comfort tone is applied to the receiver. The comfort tone is the DTMF signal with a level that is -30dB relative to the line signal. The receive gain can be adjusted under user control by using the volume control keys (not on SA2531D). The VOL key gives a 4dB increase or returns the gain to normal in a Toggle Function. Alternatively the + and - keys may be used. The + key increases the gain to a maximum of +6dB while the - key reduces the gain to a minimum of -4dB. Each press of the keys changes the gain by approximately 2dB. The gain is reset by the next on-hook. Side Tone
Side Tone is controlled along with Return Loss by a Double Balance Bridge as shown in Fig. 1. Figure 1 Double balance bridge (return loss and side tone) with one common ground A good side tone cancellation is achieved by using the following equation: ZBAL = ZLINE R5 R1
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SA2531 A/B/C/E/G/U The side tone cancellation signal is applied to the STB input.
Line Loss Compensation When Line Loss Compensation is active the gain of the Transmit and Receive amplifiers are changed by 6dB in accordance with the DC conditions as measured at Pins LI and LS. When the LLC Pin is Low this adjustment in gain occurs over the range I LINE = 20 to 50 mA. When LLC is High the range is 45 to 75mA. Note that these figures apply for R1 = R30. When the LLC Pin is open the amplifier gains remain fixed regardless of the Line Current (see figures 6 & 7). Dialling Functions Valid Keys The keypad of the SA2531 comprises a maximum of 32 keys some of which are provided to cater for options (such as the two Recall/Flash periods). A Bi-polar scan technique is used so that the 32 keys are scanned in a 4 x 8 matrix using only 8 pins. Two explanatory keypad arrangements are illustrated in Figures 2 & 3. 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 drive the keypad inputs with a micro controller. 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. The circuit will revert to LD by pressing the R (or R2) key 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. Last Number Redial LNR is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. The LNR is repeatable. The current contents of the RAM are overwritten by new entries. A manually entered number is automatically stored in the LNR RAM. The capacity of the 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).
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SA2531 A/B/C/E/G/U 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. (Further details of the Pause Function are included in the Memory Keys section.) Recall Function A Recall (R key or R2 key) 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 pause of 27ums or 3 seconds will automatically be executed. On versions C/C/E/G a recall cannot be executed in LD mode. Memory Keys The keys M1 to M10 are direct memory access keys and the MEM key is used for indirect or abbreviated dialling. In the on chip RAM, 14 numbers can be stored. Each number can contain up to 21 digits (including pauses). During programming multiple pauses can be inserted by pressing the PAUSE key or the LNR key. Each pause is 3 seconds (optionally 6 or 2 seconds) when inserted within the first 5 digits otherwise a wait function that will halt dialling until the PAUSE key or the LNR key is depressed. Memory dialling is cascadable. However, the content of one memory must be dialled out before a new one can be invoked. 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 earpiece. Sliding Cursor Procedure To accommodate easy and uncomplicated redialling (LNR) behind a PABX, a sliding cursor protocol is implemented. If new entries match the previous RAM contents, pressing the LNR key will dial out the remaining digits. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number.
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SA2531 A/B/C/E/G/U
Tone Generator The tone generator incorporates the DTMF tones and 3 basic frequencies for the tone ringer. DTMF Tones The DTMF Tone Generator creates 12 Tones in compliance with CCITT Recommendation Q23. Signal levels are altered by Mask Option. High group frequencies have a level 2.6dB higher than those of the Low Group. Details of the DTMF Tones are: Low group Digit Digit Digit Digit High group Digit 1-4-7-* KEYBORD ARRANGEMENT 1 1209Hz (Error = +.533%) 1-2-3 4-5-6 7-8-9 *-0-# 697Hz 770Hz 852Hz 941Hz (Error = -.074%) (Error = -.679% (Error = -.621%) (Error = +.139%)
10 Direct memories (either VOL or +/- keys)
Figure 2
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SA2531 A/B/C/E/G/U KEYBORD ARRANGEMENT 2 4 Direct and 10 Indirect memories (either VOL or +/- keys)
Figure 3 Tone Ringer The Tone Ringer of the SA2531 incorporates a Discriminator Circuit and adjustable Melody Generator Ring Frequency Discrimination The Ring Frequency Discriminator assures that only signals with a frequency between 20Hz and 60Hz (option 13 Hz to 70 Hz) are regarded as valid ring signals. When a valid ring signal is present for 73 ms continuously, the melody generator is activated and remains active as long as the ring signal is present. Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or unvalid ring signal respectively (until next POR of off-hook). Melody Generator When a Valid Ring Signal is detected the Melody generator is activated and creates a ringing Signal comprising 3 frequencies F1 (800Hz), F2 (1067Hz) and F3 (1333Hz). These frequencies are repeated in a sequence of 6 time slots constructed by the frequencies F1 F2 F3 F1 F2 F3 This seqeunce is repeated 1, 4, 7 or 10 times per second as indicated by the connection of the RR Pin to one of the four rows of the keyboard. sames
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SA2531 A/B/C/E/G/U TYPICAL APPLICATION Only the components necessary for presenting the complete functions of the SA2531 are included.
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SA2531 A/B/C/E/G/U Digit 2-5-8-0 Digit 3-6-9-# 1336 Hz 1477Hz (Error = +.176%) (Error = -.141%)
Errors are calculated with reference to a base clock of 3.58MHz and at ambient temperature of 24C. They exclude tolerance errors in the base frequency. OPERATING PROCEDURES Procedure Principles The procedures for utilizing the features of the SA2531 are optimized out of consideration for the human factor in order to: - meet the user's expectations - be easy to learn and relearn SYMBOLS
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SA2531 A/B/C/E/G/U Privacy Mute
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SA2531 A/B/C/E/G/U Temporary MF
FIFO
Pressing any other key does not change the state.
EXIT FIFO
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SA2531 A/B/C/E/G/U Storing Numbers
Key entries different to the procedure will be ignored. Exit programme mode from each state with on-hook or ENTER.
Programme State
1) Entries (0 - 9, *, #, PAUSE, R, R2) will be stored immediately into the selected memory.
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SA2531 A/B/C/E/G/U Automatic Dialling
Postdailled digits are not stored but buffered in FIFO
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SA2531 A/B/C/E/G/U TIMING DIAGRAMS LD Dialling
LD Dialling with Access Pause
MF Dialling
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SA2531 A/B/C/E/G/U Flash
ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Positive Supply Voltage ....................................................................................... -0.3VVDD7V Input current .................................................................................................................. 25mA Input Voltage (LS) .............................................................................................. -0.3VVIN10V Input Voltage (LI, CS) ........................................................................................... -0.3VVIN8V Input Voltage (STB, RI) .............................................................................. -2VVVINVDD+0.3V Input Voltage (MO) ............................................................................................. -0.3VVIN35V Digital Input Voltage ................................................................................... -0.3VVINVDD+0.3V Electrostatic Discharge ................................................................................................... 800V Storage Temperature ...................................................................................... -65C to +125C Recommended Operating Conditions Supply Voltage * (Speech Mode).......................................................................... 4VVDD5V Oscillator Frequency (Resonator: Murata CSA 3.58M G312AM).......................... 3.58 MHz Operating Temperature ................................................................................... -25C to +70C * This voltage is generated internally DC Characteristics (ILINE = 15 mA unless otherwise specified) Symbol IDD Parameter Operating Current Conditions Speech mode MF dialling LD dialling VDD = 2.5V Ring mode V DD = 2.5V Idle mode V DD = 2V, TAMB = 25C 13mAILINE 100mA VOL = 0.4V Min Typ 3 4 200 300 0.05 4.5 1.5 Max 5 Units mA mA A A A V mA
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IDDO VLI IOL
Retention Current Line Voltage (default) Output Current, Sink CS,HS/DP,MO sames
SA2531 A/B/C/E/G/U AC Characteristics (ILINE=15mA;f=800Hz unless otherwise specified) Symbol Parameter TX Transmit ATX ATX/F THD VAGC ASCO tATTACK tDECAY ZIN AMUTE VNO VFC Gain (M1/M2) Variation with Frequency Distortion Soft Clip Level Soft Clip Overdrive Attack Time Decay Time Input Impedance (M1/M2) Mute Attenuation Noise Output Voltage Unwanted Frequency Components VIN MAX BJT VIN MAX VTX RL Input Voltage Range (M1/M2) Output Driver Input Voltage Range (LI) Dynamic Range Return Loss ZRL = 600 and 1000 18 2 2 VPEAK VPEAK dB 50...300 Hz 4.3...28 kHz above 28 kHZ Differential Single Ended 1 0.5 Mute activated 60 -72 -43 note 6 -70 dBm VPEAK VPEAK Conditions Test Circuit Fig.5 ZRL=600 (///F/J) ZRL = 1000 (C/D/G/v) f=500Hz to 3.4kHz VLI0.5VRMS VLI = 2 20 30 20 20 Min 34 Typ 35 36.5 0.8 2 dB % VPEAK dB s/6dB ms/6dB k dB dBmp dBm Max 36 Units dB
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SA2531 A/B/C/E/G/U
AC Characteristics (cont'd) (ILINE = 15 mA;f=800Hz unless otherwise specified) Symbol Parameter RX ARX Conditions Min 1 Typ 2 0 6 0.8 2 1 1 0 Attact Time VRI>0.8V 20 -72 50 Hz...20 kHz 8 2 Test Circuit Fig.5 V RI 0.5V RMS 2 6 2 80 15 Goingoff-hook Line breaks/on-hook Note 5 -12.5 -9.5 2.0 2.0 -11 8 2 6 . 2.6 15 240 1.2 -9.5 -6.5 3.0 3.2 V dB
PEAK
Max Units 3 dB
Receive Test Circuit Fig.5 Receive Gain (RO1/RO2) ZRL=600 (///F/J) ZRL=1000 (C/G/U) (D)
A RX/F Variation with Frequency f=500 Hz to 3.4 kHz THD V A
AGC SCO
dB % V 3 0
PEAK
Distortion Soft Clip Level Soft Clip Overdrive
V RI 0.5V R M S V RI=
dB s/ ms/6dB dBmp dBm k V
PEAK
t ATTACT 6dB t V V
DECAY NO FC
Decay Time Noise Output Voltage Unwanted Frequency Components Input Impedance (RI)
-60
Z IN V IN ST A
ST ST RI
Input Voltage Range(RI) Sidetone Sidetone Cancellation Input Voltage Range (STB) Input Impedance (STB) Keyboard Key Debounce Time HS Input Low to High Debounce High to Low Debounce DTMF Frequency deviation
V IN Z IN t t t
k m s ms ms % dB dB dB dB
D
HS-L HS-H
F V MF V L-H V L-H
MF Tone Level(Low group) SA2531B/D/G/U SA2531A/C/E/F/J Preemphasis Low to High SA2531A/B/C/E/F/J/U Preemphasis Low to High SA2531D/G
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SA2531 A/B/C/E/G/U AC Characteristics Cont'd Symbol Parameter tTD tITP tITP tTR tTF tDR tM/B tPDP tIDP tMO tFD Tone Duration Inter Tone Pause Inter Tone Pause Tone Rise Time Tone Fall Time LD Dial Rate Make/Break Period Pre-Digit Pause Inter Digit Pause Mute Overhang Flash Duration 1 Flash Duration 2 Flash Duration 2 Post Flash Pause Access Pause Access Pause Tone Ringer Melody Output Level Melody Delay Frequency 1 Frequency 2 Frequency 3 Detection Time Detection Time-out Min. Detection Frequency Min. Detection Frequency Max. Detection Frequency Max. Detection Frequency SA2531B/CD//E/F/G SA2531A/J/U SA2531 A/B/F SA2531 C/D/E/G/J/U SA2531A/B/F SA2531C SA2531D/E/G/J/U 2.9 2.0 5.8 2.9 100 270 600 2.74 3.0 2.05 6.0 3.0 PDM 770 1025 1280 70 19 12 58 68 800 1067 1333 note 4 20 13 59 70 10 830 1110 1385 80 21 14 60 75 ms Hz Hz Hz ms ms Hz Hz Hz Hz 3.1 2.12 6.2 3.1 800 5% 5%, MODE=low 5%, MODE=high 10 40.8/61.2 33/66 35 840 tM 102 300 650 ms ms ms ms sec. sec sec sec 880 pps ms ms ms ms Conditions Note 1 SA2531A/B/C/D/F/ G/J/U Note 1 SA2531E; Note 1 Note 2 Note 2 Min 80 80 160 Typ 82.3 82.3 165 Max 85 85 170 5 5 Units ms ms ms ms ms
tPFP tAP tAP
VMO tMD F1 F2 F3 tDT tTO fMIN fMIN fMAX
Initial SA2531D/G SA2531A/B/C/E/F/J/U SA2531D/G SA2531A/B/C/E/F/J/U
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SA2531 A/B/C/E/G/U
AC Characteristics Cont'd Symbol Parameter Reminder Tone VRT Level (RO1/RO2) tRTD Duration Interval tRTI Comfort Tone (DTMF) VCT Level (RO1/RO2) Conditions Relative to LS Min Typ -30 82.3 3 -30 Max Units dBr ms sec dBr
Relative to LS
Note 1: Note 2: Note 3: Note 4:
Note 5: Note 6:
The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. The rise time is the time from 10% of final value till the tone amplitude has reached 90% of its final value. Relative to high group. The FCI circuit is reset by POR and HS/DP pulled high (off-hook). After a reset the FCI circuit is in a standby state. A positive edge on FCI will start a 73 ms timer and the frequency discrimination is initiated. Whenever a period of the ring signal is missing, the timer is reset. When a valid ring signal is present for 73 ms, the melody generator is started and is directly controlled by the ring signal. This condition will remain until a new reset. This does not include the frequency deviation of the ceramic resonator. -37 dBm at 4.3 kHz and decreasing 12 dB/octave till 28 kHz.
Ordering information:
Versions ZRL (W) SA2531A 600 SA2531B 600 SA2531C 1000 SA2531E 600 SA2531F 600 DTMF Level -6/-8dBm FCI (Hz) 13-70 ITP (ms) 82 82 82 82 165 82 82 82 82 R2 Flash in Flash Access Pause Pause 274ms 274ms 3 sec 3 sec 3 sec 2 sec 2 sec 6 sec 3 sec 3 sec MF select (*) with tone Rx gain + 6dB, no VOL Remarks (ms) LD Mode 600 280 280 280 280 280 280 600 600 yes yes no no no yes no yes yes
-9/-11dBm 13-70 -6/-8dBm -6/-8dBm -6/-8dBm 13-70 13-70 13-70
SA2531D 1000 -9/-11dBm 20-60
274 ms 2 sec 3 sec 3 sec 3 sec 3 sec 3 sec 3 sec
SA2531G 1000 -9/-11dBm 20-60 SA2531J 600 -6/-8dBm 13-70 SA2531U 1000 -9/-11dBm 13-70
Mode pin: 10/20 pps
Package styles: DIP "P" SOIC "S" Example: SA2531U in PLCC Package = SA2531UAFA Application support:
PLCC "F"
For application support, contact your nearest SAMES Sales Office.
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SA2531 A/B/C/E/G/U Test Circuit
Figure 5
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SA2531 A/B/C/E/G/U
NOTES:
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SA2531 A/B/C/E/G/U
Disclaimer: The information contained in this document is confidential and proprietary to South African MicroElectronic Systems (Pty) Ltd ("SAMES) and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES. The information contained herein is current as of the date of publication; however, delivery of this document shall not under any circumstances create any implication that the information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves the right to make changes in such information, without notification,even if such changes would render information contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed by reference to the information contained herein, will function without errors and as intended by the designer.
South African Micro-Electronic Systems (Pty) Ltd P O Box 15888, 33 Eland Street, Lynn East, Koedoespoort Industrial Area, 0039 Pretoria, Republic of South Africa, Republic of South Africa
Tel: Fax:
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012 333-6021 012 333-8071 sames
Tel: Fax:
Int +27 12 333-6021 Int +27 12 333-8071

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