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| sames FEATURES n n n n n SA589 LD/DTMF SWITCHABLE DIALLERS WITH DEDICATED KEYS FOR 20 MEMORIES Selectable Loop-Disconnect or DTMF Modes Keypad Switchable LD to DTMF 20 x 24-Digit Memories, (each with Dedicated Key) 24 Digit Last Number Redial Selectable Make/Break Ratios 2:1 and 3:2 n Uses Inexpensive 560kHz Ceramic Resonator n Batteryless operation - Low Power CMOS n Mask Programmable Options to suit application n Timed Break Recall (Flash) and Earth Recall DESCRIPTION The SA589 family are keypad switchable LD/ DTMF dialler devices with a last number redial facility and twenty 24-digit memories each with its own dedicated dialling key. Three operating modes are available: LD only mode, DTMF only mode and LD mode with the ability to switch temporarily to DTMF mode from the keypad during a call. This last mode enables subscribers to access such services as home banking. Mixed LD and DTMF numbers can also be stored in memory. The SA589 devices are pin compatible with the SAMES switchable dialler families SA541, SA545, SA585, SA587 and SA588 - providing a complete range of telephone features within a single PCB and circuit design. Metal mask and pin selectable options are available to service specific requirements of particular countries and customers. FIG. 1 PIN CONNECTIONS SA589 NC COL6 IMP SELECT MASK OSC OUT OSC IN FILT IN FILT OUT HSW V V 1 2 3 4 5 6 7 8 9 10 11 SS DD 12 13 14 17 16 15 MFOUT COL7 ROW6 28 27 26 25 24 23 22 21 20 19 18 ROW7 COL5 COL4 ROW4 ROW3 ROW2 ROW1 COL3 COL2 COL1 MUTE PAUSE OUT ROW5 DR-00684 Package: DIP28 1/14 4120 PDS039-SA589-001 REV. C 09-03-1995 SA589 FAMILY TABLE 1: Pin number 1 3 4 5 6 7 8 9 10 11 12 13 17 18 19 20 21 26 27 2 16 22 23 24 25 14 15 28 1. 2. PIN FUNCTIONS Pin name NC IMP SELECT MASK OSC OUT OSC IN FILT IN FILT OUT HSW Hook' VSS VDD PAUSE OUT MF OUT MUTE COL1 COL2 COL3 COL4 COL5 COL6 COL7 ROW1 ROW2 ROW3 ROW4 ROW 5 ROW 6 ROW 7 Function Not connected 'Loop disconnect' dialling output LD/DTMF selection, IDP and B/M ratio programming Output to disable speech circuit during pulse dialling and recall (see note 1) Connections for 560kHz ceramic resonator Unity gain amplifier input and output for DTMF tone filtering Hookswitch input - a logic 1 at this pin is used to indicate 'OffNegative supply Positive supply Active high indicating a pause when dialling from memory Unfiltered DTMF output Output active during keying and tone transmission (see note 2) Connections for 38 key single contact keypad MASK may be used to disconnect the whole speech circuit in order to maintain the break condition whilst on-hook and during a TBR (Timed Flash) operation. MUTE is provided to disable the microphone while maintaining the loop during DTMF transmission. OPERATION Power-on When power is applied to the chip, a power-on reset circuit operates and ensures that the Memories are cleared and all logic is reset. The power-on reset circuit is designed such that if the chip supply voltage drops to a level at which the memories may be corrupted, it will always, under all conditions, clear the memory, so that corrupt data is not retained. 2/14 sames SA589 FAMILY Hookswitch Operation The HSW input is used to inform the SA589 of whether the telephone is on or off hook. Logic '0' is recognised as on-hook. Logic '1' is recognised as off-hook. When the HSW input rises from '0' to '1' the off-hook state is recognised immediately and keypad inputs are accepted. However, when the HSW input falls from '1' to '0' the on-hook state is not recognised for 200 - 300ms. This is so that short line breaks of less than 200ms, such as the line reversals applied by the exchange, are ignored. In this case the IMP and MASK outputs will go low immediately the HSW input goes low in order to preserve current, but will resume normal operation immediately HSW goes high. On-hook state In the on-hook state all chip outputs are set low, the oscillator circuit is inhibited and no key inputs are accepted. This conserves supply current so that the MEMORY contents may be retained. Off-hook state When the HSW input goes high, the MASK output immediately goes to the logic '1' level and remains there until going on-hook or signalling a TBR, (see timing diagram). COLUMN outputs also go high until a key is pressed and are normally off whenever timing functions are not required. Keypad Operation A Single Contact, Normally Open keypad is required. When off-hook the COLUMN outputs are normally held high and the ROW inputs are low. When a key is pressed this connects a COLUMN output to a ROW input and the ROW input is pulled high. This action initiates keyboard scanning. During keyboard scanning, the COLUMN outputs are normally low but generate scanning pulses at 7ms intervals on each output in sequence. A key is accepted as valid when two successive scanning pulses from the same COLUMN are seen on a ROW input. Hence, the minimum bounce-free key closure period which is necessary to guarantee detection is about 14ms (plus the oscillator start-up time if it was not already running). Simultaneous key depressions If two keys are pressed simultaneously (i.e. a second key is pressed before the first has been verified) neither key will be accepted until both keys are released and the correct key is pressed again. Dialling Mode Selection The dialling mode may be selected via the SELECT pin (Pin 4) as detailed in Table 2. Four 'Loop-Disconnect' + DTMF options, two 'Loop-disconnect only' options and three DTMF modes are available. Each mode offers a different combination of LD and/or MF timing. If one of the 'LD only' or DTMF only modes is selected then dialling will remain fixed in LD mode or DTMF mode respectively. sames 3/14 SA589 FAMILY COL 1 ROW 1 ROW2 ROW3 ROW4 ROW5 ROW6 ROW7 S10 1 4 7 * COL 2 2 5 8 0 COL 3 3 6 9 # COL 4 TBR REDIAL STORE PAUSE/ CONT COL 5 S01 S04 S07 SHIFT S11 S14 S17 Fig. 2a Versions without TONE key * or */# are used to change from LD to DTMF dialling and are available as digits when in DTMF mode. TBR: Timed Break Recall (Flash). STORE: Memory Programming key. Use in conjunction with dedicated memory keys or a two-digit code representing the number of the memory to be programmed S00-S19: 'Single touch' dedicated memory dialling keys LNR: Last Number Redial REDIAL and SHIFT: These keys are clearly unnecessary where keypad positions are provided for all the dedicated memory keys but may be useful to access memories in applications where the telephone provides insufficient keys for all these functions. For a description of the function of the REDIALand SHIFT keys, see the SA585 and SA587 data sheets, respectively. Do not fir keys in these positions if not required. PAUSE/CONT: Insert pause in memory/continue dialling TONE: Change dialling mode from LD to DTMF COL 1 ROW 1 ROW2 ROW3 ROW4 ROW5 ROW6 ROW7 S10 1 4 7 * COL 2 2 5 8 0 COL 3 3 6 9 # COL 4 TBR REDIAL STORE TONE COL 5 S01 S04 S07 SHIFT S11 S14 S17 Fig. 2b Versions with TONE key Fig. 2 Keypad layout and connections 4/14 COL 6 S02 S05 S08 S00 S12 S15 S18 COL 7 S03 S06 S09 LNR S13 S16 S19 COL 6 S02 S05 S08 S00 S12 S15 S18 COL 7 S03 S06 S09 LNR S13 S16 S19 sames SA589 FAMILY TABLE 2: Dialling mode selection Select Pin to VSS COL1 COL2 COL3 COL4 COL5 COL6 COL7 VDD Dialling Mode LD + DTMF LD + DTMF LD + DTMF LD + DTMF LD only DTMF only DTMF only LD only DTMF only B:M Ratio 2:1 2:1 3:2 3:2 2:1 3:2 TBR (msec) 100 270 270 100 270 270 100 However, if one of the 'LD + DTMF' modes is selected the chip will be in LD mode initially in the off-hook condition but may be switched to DTMF by pressing either *, */# or TONE key (depending on the mask variant - see Fig. 2 and page 11), provided that dialling is not in progress. If any of these keys are pressed during LD dialling, they will be ignored. Only if * or # are pressed subsequent to switching to DTMF, will * or # be dialled. Only digits entered prior to a switch to DTMF will subsequently be available for redialling (see Last Number Redial operation), unless specified otherwise. Once switched to DTMF, dialling will remain in this mode until either a Recall (Flash) operation or until the chip returns to the on-hook state. Last Number Redial (LNR) The function of the on-chip LNR store is to retain automatically a manually dialled number for redialling later. The capacity of the memory is 24 digits. If a number is dialled which is longer than this, dialling will continue, but redialling will not be allowed with this number. To redial a number in the LNR store, the LNR key may be pressed once, or the Redial key can be pressed twice. The last number redial store has several features designed to assist the user: Moving cursor facility This facility is provided to aid use in PABX applications, where the user must first dial an access digit, or digits, and then wait for a second dial tone before continuing dialling. This allows a user to enter the first digit or digits of the number in the last number redial store manually before pressing the LNR key; the remainder of the number will be dialled when the LNR key is pressed. If the digit(s) dialled manually do not match those in the LNR memory, then redialling will be inhibited for the remainder of the call, and the numbers entered will be saved in the LNR memory for redialling in a subsequent call. If the user manually dials the first digit(s) in the LNR memory, and then goes on-hook, the whole contents of the memory will be retained. sames 5/14 SA589 FAMILY Mixed Mode Calls In the case of a call which starts in LD mode and is switched by the user (via the *, */#, or TONE key) to DTMF mode, only the digits dialled in LD mode will be retained. This feature is provided to ensure security of PIN (Personal Identification Number) codes. Provided that the number of digits dialled in LD mode does not exceed 24, they will be retained regardless of the number of DTMF digits entered subsequently. Memory Dialling The SA589 provides 20 memories, each of which has a capacity of 24 digits and each of which has its own dedicated key . The memories can save digits for dialling in LD, DTMF and Mixed Modes and can include pauses if desired. Programming Memories The SA589 must be 'off-hook' and idle: 1. 2. 3. 4. 5. Press the STORE key. Press the key (S00 - S19) of the memory to be programmed. Enter digits to be stored (no digits will be dialled whilst programming). To finish programming the memory either press the STORE key again or go 'on-hook'. Repeat to programme other memories. If more than 24 digits are entered while programming a memory, then the memory will be cleared until reprogrammed. If any non-valid keys are pressed during programming (e.g.LNR, TBR) they will be ignored. Mixed mode numbers and Pauses in memory Mixed mode (i.e. LD + DTMF) numbers are easily programmed into memory. The SELECT pin should be set to one of the 'LD + DTMF' modes (as it would be when dialling a mixed mode number), then the number entered using the same procedure as if dialling normally. The first press of *, */# or TONE (according to the mask variant) will be stored as a 'change to DTMF' and this will cause all subsequent digits to be sent in DTMF when redialling from memory. Similarly, pauses can be stored in memory by pressing the PAUSE key in the appropriate position when programming. When redialling from memory, both Pauses and LD to DTMF changeovers will cause dialling to halt temporarily until the user presses the PAUSE/CONT key. The exception to this rule is when an LD to DTMF changeover, is stored in the first memory location; in this case, DTMF dialling will occur immediately when memory dialling is invoked - this allows DTMF codes to be easily stored and sent even in a telephone where the normal dialling mode is LD. It should be noted that a Pause or an LD to DTMF changeover each require one memory location. 6/14 sames SA589 FAMILY Dialling from memories The SA589 must be 'off-hook' and idle: 1. 2. Press the appropriate memory key (S00 - S19). Dialling will now start. If dialling halts due to a Pause or an LD to DTMF changeover in the memory, the PAUSE OUT pin will go high (logic '1'). Further dialling can be resumed by pressing the PAUSE/ CONT key or alternatively, by pulling the Column 4 pin low (for a minimum of 14 ms) to achieve the same result thus allowing an external timer circuit to be used. The PAUSE OUT output is reset when dialling resumes. All keypad positions are disabled whilst memory dialling is in progress. Timed Break & Earth Loop Recall The SA589 supports both TBR and ELR and offers a common operating protocol in both cases. After a recall (Flash) operation, the dialling mode selected via the SELECT pin will be restored. Also, only the digits dialled after the ELR/TBR operation will be retained in the LNR store (1). A TBR (Flash) of 100ms or 270ms(2) is generated when the TBR key is pressed. The MASK output goes low in order to produce the line break. When in DTMF mode, the MF OUT output also goes low for the duration of the break. ELR is supported via the column 3 pin. If this pin is connected to ground for a minimum of 20ms during an ELR operation, the chip will offer the same operating protocol as for TBR. This may be achieved by use of the circuit shown below in Fig. 3, or by use of a double contact switch. (1) (2) Other options are available. Other TBR (Flash) periods are available as mask options SA589 21 COL 3 22 DR-00685 Fig. 3 Earth loop recall sames 7/14 SA589 FAMILY Oscillator Circuit This requires an external 560kHz ceramic resonator connected between OSC IN and OSC OUT to provide a timing reference for all chip functions. No other components are required or should be used. The oscillator circuit is of the 'single pin' type. Internally, the OSC IN pin is connected to VSS and therefore the resonator may alternatively be connected externally between OSC OUT and VSS if desired. Please consult your resonator supplier who will recommend a suitable resonator type. Tone Filtering The spectral purity of the DTMF output is sufficient for most applications. However, where lower distortion DTMF tones are required, an on-chip darlington pair is provided (accessible via pins 7 & 8) for use in a low pass active filter. Fig. 4 shows how a 2-pole Sallen and Key filter can be implemented. The typical component values have been chosen to give a second order Butterworth response with a cut-off frequency of about 3,5kHz and a nominal pass-band insertion loss of 0.5dB. DTMF DIALLING During DTMF dialling the MUTE output goes to logic '1' and remains there for the duration of the tone transmission. The IMP output remains low during tone transmission. The MF OUT output rises to its DC level of 0.9 VDD at the start of the tone transmission and is kept there between tone bursts. This is to avoid transients at the beginning and end of tone bursts. The maximum rate at which tones are sent to line is 100ms on, followed by 100ms off (unless specified otherwise). If keys are activated faster than this they are placed in a temporary store and then sent to line at the maximum rate. Dialling from the LNR memory occurs at the maximum rate. If a key is held down for longer than the minimum Tone Burst period, the tone output will continue until the key is released. 8/14 sames SA589 FAMILY SA589 V DD 17 MFOUT R1 R2 8 FILTIN C1 9 FILTOUT C12 Typical values: R1 = 56k R2 = 56k R4 + R3 = 10k C1 = 1.3nF C2 = 470pF DR-00686 R3 OUTPUT R4 V SS Fig. 4 DTMF tone filtering HOOK SWITCH KEY PRESS COLUMN ROW "5" MASK IMP(LOW) "8" "TBR" "9" MUTE "5" MF OUT 100ms DR-00687 100ms "8" "9"SHORTENED 100ms ON HOOK TIME OUT Fig. 5 DTMF mode timing diagram sames 9/14 SA589 FAMILY TABLE 3: Tone Frequencies Keypad Nominal frequency (Hz) Deviation from nominal (%) R1 697 -0.07 R2 770 R3 852 R4 941 C1 1209 C2 1336 -0.20 C3 1477 -0.22 C4 1633 -0.31 -0.10 +0.19 -0.15 -0.17 NOTE: There will be an additional frequency error caused by any deviation of the resonator frequency from the nominal 560kHz. LOOP DISCONNECT DIALLING The MASK output is provided in order to disable the speech circuit during LD dialling. Consequently the MASK output is normally at logic '1' in the off-hook condition, but changes to logic '0' during LD dialling. MASK also changes to logic '0' in order to signal a Timed Break Recall (Flash) to the line. Both MUTE and MF OUT remain low during LD dialling. LD dialling is signalled on the IMP output. A break is signalled by a logic '0'. Make periods and IDP times are signalled by a logic '1'. When not dialling, the IMP output sits at logic '0'. HOOK SWITCH KEY PRESS COLUMN ROW "5" MASK IMP "5" MUTE(LOW) MF OUT ON HOOK TIME OUT DR-00688 "8" "TBR" "9" "IDP" 2.2340 "8" "9" (PARTIAL) Fig. 6 LD mode timing diagram 10/14 sames SA589 FAMILY IMP t1 t2 t3 t1 t2 t3 t4 t5 = = = = = PRE-DIGIT PAUSE (=t ) 5 t4 t5 t3 BREAK PERIOD (60ms or 67ms) MAKE PERIOD (40ms or 33ms) POST-DIGIT MAKE (=t ) 3 INTER-DIGIT PAUSE (800ms) DR-00689 Fig.7 Timing data MASK OPTIONS The SA589 has been designed so that many features can be altered quickly and inexpensively at the final stage of manufacture. These options allow the telephone manufacturer to cater for different market requirements throughout the world without changing the telephone circuit. The options, listed below, are possible in any combination. Standard options are listed first in bold italics at 'a'. Other options may be produced by arrangement. Please consult your nearest SAMES Representative for advice on availability. A. 'Long' TBR (Flash) Period a. 270ms b. 600ms LD to DTMF Keypad Switching a. * and # keys b. TONE key c. * key Retention of Post-*/#Digits in LNR Store (DTMF Mode) a. All digits retained b. Digits before * or # retained Short/Long TBR Selection a. As specified b. Short and Long TBR reversed Recall (Flash)/LNR protocol a. Digits dialled after Recall retained b. Digits dialled before Recall retained B. C. D. E. sames 11/14 SA589 FAMILY F. DTMF Minimum Timings a. 100ms on, 100ms off b. 85ms on, 85ms off c. 85ms on, 170ms off Pin 5 a. MASK b. MASK Pin 3 a. IMP b. IMP c. [IMP + MASK] d. I. [IMP + MASK] Pin 18 a. MUTE b. MUTE Pin 13 Function a. PAUSE OUT b. SECRECY G. H. J. ABSOLUTE MAXIMUM RATINGS * Parameter Min -0,3 Supply Voltage VDD - VSS Voltage on any pin (except HSW) VSS -0,3 Voltage on pin HSW VSS -0,3 Current at any pin -1 (except HSW, FILTOUT and FILTIN) Current at pin FILTOUT 0 Current at pin FILTIN -5 Operating Temperature -25 Storage Temperature -55 Typ Max Unit 6,5 V VDD +0,3 V V 1 mA 0,1 0 70 125 mA mA C C Notes See Note 1 * Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This a stress rating only. Functional operation of the device at these or any other condition above those indicated in the operation sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability. Note 1: A diode is internally connected between this pin and VDD . Provided current is externally limited to 300A max, no damage will occur. 12/14 sames SA589 FAMILY DC ELECTRICAL CHARACTERISTICS (VDD = 2,5V at 25C, unless otherwise specified) on-hook For memory retention off-hook 5,7 Hookswitch input: on-hook 0,2 VDD off-hook 0,8 VDD Supply Current: on-hook <0.2 5 A VDD = 2.5V (See note 1) off-hook 1,5 A See note 1 MF tone sending 1,0 mA If MF OUT is low LD impulsing 200 A Output High Voltage 2,2 V I = -1mA (MASK, MUTE and IMP Outputs) Output Low Voltage 0,3 V I = +1mA (MASK, MUTE and IMP Outputs) MF OUT d.c. Level During Tone V Sending 0,9V DD MF OUT Output Resistance 3 K 'Key Pressed' Resistance 2 K 2,5V sames 13/14 SA589 FAMILY 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, 0039 Koedoespoort Industrial Area, Republic of South Africa, Pretoria, Republic of South Africa Tel: Fax: 14/14 012 333-6021 012 333-8071 sames Tel: Fax: Int +27 12 333-6021 Int +27 12 333-8071 |
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