SC91214/91215 SERIES T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION DESCRIPTION The SC91214/15 Series is a single-chip, silicon gate, CMOS integrated circuit with an on-chip oscillator for a 3.58MHZ crystal or ceramic resonator. It provides a dialing pulse (DP) or dual tone multifrequency (DTMF) dialing. A standard 4 X4 matrix keyboard can be used to support either DP or DTMF modes. FEATURES * One touch redial operation * Tone/Pulse switchable * 32 digit capacity for redialing * Automatic mixed redialing (last number redial) of pulse to DTMF with multiple automatic access pauses * PABX auto-pause is 2.2 seconds * DTMF Timing: ORDERING INFORMATION Part Package Manual dialing: minimum duration for bursts and pauses SC91214/15A DIP-16 Package Redialing: calibrated timing SC91214/15B DIP-18 Package SC91214/15C DIP-18 Package SC91214/15D DIP-20 Package * Hands-Free control function * Wide operating voltage range: 2V to 5.5V * Key-in beep tone output * Digits dialed manually after redialing are cascadable and stored as additional digits for the next redialing * Uses inexpensive ceramic resonator (3.58 MHZ) * Two versions for different telephone systems * Built-in power up reset circuit * Four extra function keys: flash, pause, redial and DP or DTMF mixed dialing * 4 X 4 (or 2 X 8) keyboard can be used * Low standby current HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 1 of 16 SC91214/91215 SERIES BLOCK DIAGRAM ABSOLUTE MAXIMUM RATING (Tamb=25°C, All voltage referenced to VSS, unless otherwise specified) Characteristics Symbol Value Unit Power Supply Voltage VDD 6.0 V Input Voltage VIN -0.3~VDD+0.3 V VOUT -0.3~VDD+0.3 V Output Voltage (DP, XMIT MUTE) VOUT 1.2 V Tone Output Current ITONE 50 mA Power Dissipation PD 500 mW Operating Temperature Topr -25~+70 °C Storage Temperature Tstg -55~+150 °C Output Voltage Note: Stresses above those listed under “Absolute Maximum Ratings”may cause permanent damage to this device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied or intended. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 2 of 16 SC91214/91215 SERIES AC ELECTRICAL CHARACTERISTICS (Top=25°C, VDD=3.5V, VSS=0V, fosc=3.579545MHz, All voltage referenced to VSS, unless otherwise specified) Characteristics Symbol Operating Voltage VDD Memory Retention Voltage VMR Memory Retention Current IMR Operating Current Standby Current R1 - R4 Input Current Typ. Max. Tone mode 2.0 -- 5.5 Pulse mode 2.0 -- 5.5 All outputs unloaded IDDP Pulse mode IDDT Tone mode All outputs unloaded HK =VDD=1.5V All outputs unloaded, no key selected HK =VSS 2.0 0.03 0.05 0.5 10 0.2 VOC Column VOR Row DIS% VDD=3.5V, RL=5K A V -- µA -- mA A µA A VDD C mVp-p D 5 µA B 0.4 2 mA B 0.9 5.3 mA B 1.1 5.3 mA B 584 730 876 456 570 684 HFI pin connected to 0V VOH=VDD-0.4V VDD=3.5V VOL=0.4V VDD=3.5V, VOL=0.4V KT. µA VDD=3.5V (Note 1) VDD=3.5V Test V 115 IOL2 * see note below 1 5 % 2 1/2 2 100 X ( V1 + V 2 + 2 0.6 0 IOL1 2 1.0 VIL | IOH1 | Distortion 0.32 1 HFO Drive Current DP Sink Current 0.4 0.8 | IHFI | XMITMUTE Sink Current 0.05 VIH HFI Pull Low Current HFO, KT , MODEOUT Unit 1 IR Tone out Voltage * Note: DIS% = Min. VDD=1.0V, HK =VDD ISO Input Voltage Conditions + Vn ) 2 1/2 ( VIL + VIH ) 1. V1 … Vn are the intermediation or the harmonic frequencies in the 500Hz to 3400Hz band. 2. VIL and VIH are the individual frequency components of the DTMF signal. AC CHARACTERISTICS (Top=25°C, VDD=3.5V, VSS=0V, fosc=3.579545MHz, All voltage referenced to VSS, unless otherwise specified) Characteristics Symbol Conditions 10pps Make Time TM 20pps Min. Typ. M/B=1/2 33.3 M/B=2/3 40.0 M/B=1/2 16.7 M/B=2/3 20.0 Max. Unit ms (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 3 of 16 SC91214/91215 SERIES (Continued) Characteristics Symbol Conditions 10pps Break Time TB 20pps Min. Typ. M/B=1/2 66.6 M/B=2/3 60.0 M/B=1/2 33.3 M/B=2/3 30.0 10pps 824 20pps 458 Max. Unit ms Inter-digit Pause Time TIDP Pause Time TPAU 2.2 sec Auto-redial Break Time TAOBK 2.2 sec TD 0 ms Key-in Debounce TKD 21 ms Key Release Debounce Time TKLD 5.2 ms Key-in Tone Duration TKTD 23 ms Key-in Tone Frequency FKT 437 Hz Minimum Tone Duration Time TMFD 90 ms Min. Tone Inter-digit Pause TTIDP 100 ms Redial Tone Duration TMFDR 90 ms Redial Tone Inter-digit Duration TTIDPR 100 ms Delay Time Key Valid to Signal Out ms COMPARISONS OF SPECIFIED VS ACTUAL TONE FREQUENCIES (fosc=3.579MHz) R/C Spec. Actual Error (%) Unit R1 697 699.1 +0.31 Hz R2 770 771.5 +0.19 Hz R3 852 852.3 +0.03 Hz R4 941 942.0 +0.10 Hz C1 1,29 1,215.7 +0.57 Hz C2 1,336 1,331.7 -0.32 Hz C3 1,477 1,471.9 -0.35 Hz KEYBOARD ASSIGNMENT 1) */T: In PULSE mode this key works as Pulse→DTMF key (T key). In DTMF mode the key works as * key. */T key will occupy one memory digit in either use. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 4 of 16 SC91214/91215 SERIES 2) F1: Flash key. The break time is 297 ms or 96 ms (SC91214/15 respectively) 3) F2: Flash key for break time 640 ms 4) P: Pause key (2.2 seconds) 5) RD: One key redial key 6) EMn: One touch memory key 7) #: In PULSE mode this key input is neglected. In DTMF mode this key works as # key. PIN CONFIGURATION HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 5 of 16 SC91214/91215 SERIES PIN DESCRIPTION Pin No. Pin Description SC9121 SC9121 SC9121 SC9121 4A 4B 4C 4D 3 3 4 4 OSCI Oscillator Input and Output pins. 4 4 5 5 OSCO The time base for the SC91214/15 is a crystal Name controlled on-chip oscillator, which is completed by connecting a 3.58MHz crystal or ceramic resonator between the OSCI and OSCO pins. 2 2 3 3 MODE IN TRI-STATE mode select pin. There ate two versions of the SC91214/15 as follows: a. SC91215 Series is for European and American systems. Tone/ Dial M/B Pulse Rate Ratio VDD Pulse 10pps 2/3 VSS Tone -- -- Floating Pulse 10pps 1/2 MODE IN b. The SC91214 Series is for the Japanese system. MODE IN VDD Tone/ Dial M/B Pulse Rate Ratio Pulse 10pps 1/2 VSS Tone -- -- Floating Pulse 20pps 1/2 The mode selection pin is checked for tone/pulse dialing as each digit key entery. In the PULSE mode, the dialing rate is checked, along with the make/break ratio, at first key entry. 1 1 2 2 HK Hook switch input This inverter input pin detects the state of the hook switch contact. “Off Hook”is represented by a VDD condition. (N.A.) 10 (N.A.) 11 KT Key-in tone output This N-channel open drain pin sends out a “beep” tone for each PULSE mode key entry, along with entries of accepted function keys (RD, T, F1 F2, an P keys). The tone output frequency is 437Hz and tone duration is 23 ms. (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 6 of 16 SC91214/91215 SERIES (Continued) Pin No. SC9121 SC9121 SC9121 SC9121 4A 4B 4C 4D 9 11 10 12 Pin Description Name DP Dialing pulse output This is an N-channel open drain output. The normal output will be “ON”during break an “OFF” during make in the PULSE DIALING mode. (N.A.) (N.A.) 1 1 HFO Hands-Free Control I/O pins These pins enable and disable the Hands-Free control function. When input pin HFI goes low, the Hands-Free Control state is toggled on. The status of the Hands-Free control state is listed in the following table: 7 7 18 20 HFI 8 8 TONE Tone dialing output When a valid key-press is detected in the DTMF mode, appropriate low group and high group, frequencies the dual tone output. TONE output is in the “OFF”state in PULSE mode. 8 8 9 9 XMITMUTE Dialing transmission mute output This is an N-channel open drain output. The XMITMUTE is normally “OFF”. During pulse or DTMF dialing this output is “ON”. (N.A.) 9 (N.A.) 10 MODE OUT Mode output pin This is an N-channel, open drain output. It is “ON” during tone output and “OFF”during pulse output. 13 15 14 16 R1 Keyboard pins 14 16 15 17 R2 This input serves as the interface to an XY matrix 15 17 16 18 R3 16 18 17 19 R4 10 12 11 13 C1 11 13 12 14 C2 12 14 13 15 C3 6 6 7 7 VDD Power supply pins 5 5 6 6 VSS These devices are designed to operate from 2.0V keyboard. On a 4 X 4 matrix keyboard, the input from the fourth column, C4 , should be connected to VSS. to 5.5V. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 7 of 16 SC91214/91215 SERIES KEYBOARD OPERATION • Symbol definitions: In the description below, signals are defined in terms of the key or switch, which is activated. OFF Hook means the phone is off the hook. ON Hook means the phone is on the hook. D1 represents for the first digit dialed in a string of digits. Dn (Dk) represents for the last digit dialed in a string of digits. Dn+1 represent for the beginning of a new string of digits. Dn+m represents for the last digit in a new string of digits. HFI ↓ represents for the switch that activates the HANDS-FREE DIALING mode going low. */T is the Pulse-to-DTMF key. RD is the Redial key. 0 is the Zero key. P is the Pause key. F is the Flash key. • Recommended Operation 1. PULSE mode operation a. Off Hook D1 … Dn PULSE mode is defined as the INTIAL mode, provided the first keyboard input is not the */T key following the Off Hook condition and the mode selection pin is floating (MODE IN = VDD or floating). b. On Hook HFI ↓ D1 … Dn Pulse mode is defined as the INITIAL mode, provided the key input D1 is not */T while the mode selection pin is VDD or floating. The chip will pause for 824 ms automatically after it detects an Off-Hook condition or if the HFI ↓ key is depressed. It then proceeds with pulse or DTMF dialing if any keys have been depressed. The dialing rate or make/break ratio is decided at the first key entry by checking the MODE IN status and will not be altered. The MODE IN status can only switch the DIALING mode from PULSE to DTMF after the first key ectry. 2. DTMF mode operation a. Off Hook D1 … Dn or On Hook HFI ↓ D1 … Dn DTMF mode is defined as the INTIAL mode if the mode selection pin MOD IN is VSS. b. Off Hook D1 … Dn or On Hook HFI ↓ */T D1 … Dn HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 8 of 16 SC91214/91215 SERIES The INITIAL mode is PULSE mode if the mode selection pin, MODE IN, is VDD or floating. The switch the DIALING mode to TONE mode. Unlike NORMAL mode switching, the */T key can */T key entry, as the first key pressed, will not produce any pause time, there are only 31 digits of redial memory available in the buffer to be used for operation a and b, since the mode switching key, */T, will occupy one digit of space. 3. Manual dialing with automatic access pause a. Off Hook O P D1 … Dn Pause key entries can be accepted and stored and stored in the redial memory. Each is stored as a digit. Each key-in will provide a pause of 3.57 seconds, depending on which model is being used. 4. Redial a. Off Hook RD or On Hook HFI ↓ RD Up to 32 digits (in PULSE mode) or 31 digits (in TONE mode) can be dialed using the RD key. The RD key is disabled while PULSE or TONE signals are being transmitted. Redial will also be inhibited if the last number dialed exceeds 32 digits because the redial memory can only hold 32 digits. b. Off Hook RD D1 … Dn or On Hook HFI ↓ RD D1 … Dn After pressing the RD key, digits may be added to the number in redial memory. When finished dialing, the redial memory will contain the original digits, plus the digits dialed after pressing RD . each time the redial key is pressed, the stored number will be dialed exactly the same as it was previously, regardless of the status of the MODE IN pin. 5. TONE/PULSE switch operation a. Off Hook D1 … Dn MODE IN pin switched to VSS Dn+1 PULSE Mode … Dn+m DTMF Mode The mode selection pin is always checked for TONE or PULSE mode key entry. Dialing can be switched from PULSE to TONE mode, but not from TONE to PULSE mode. Switching the MODE IN pin to Vss will cause the chip to store a */T digit prior to first tone digit in the redial memory and will automatically insert a 2.2 second pause before the tone digits are dialed out. After the mode has been switched, the status of the mode selection pin will no longer be checked. Therefore, it will not be possible to switch from TONE to PULSE mode. b. Off Hook D1 … Dn */T Dn+1 … Dn+m PULSE Mode DTMF Mode PULSE mode is initially defined with the mode selection pin, MODE IN, equal to VDD or floating. At this time, the mode can be switched to DTMF by pressing the */T key. DTMF mode will being as soon as the last pulse has been transmitted. In this mode, Dn+1 through Dn+m are sent through the TONE OUT pin as DTMF signals. If a P key entry is contained in the series of digits before or after the */T entry, or the MODE IN switch is depressed, 2.2 second pause will be added to the automatically inserted pause time, which is also 3.57 seconds. Both of the above switching modes can store as many as 31 digits in the redial memory. 6. One-key redialing Off-Hook D1 … Dn RD or On Hook HFI ↓ D1 … Dn RD HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 9 of 16 SC91214/91215 SERIES If the dialing of D1 to Dn is finished, pressing RD will cause the pulse dialing pin to go low for 67 seconds of break time and an 824 ms pause will automatically be added. If the pulses of the number dialed with D1 to Dn have not finished, the pressing of the redial key will be ignored. 7. Flash dialing Off Hook F D1 … Dn or On Hook HFI ↓ F D1 … Dn The flash key emulate quick On-Off Hook operations. Pressing the flash keys, F1 or F2 , will cause a break of 96 ms or 640 ms (or, 297 ms or 640 ms, depending on the mode) on the DP output pin. Then, it pauses for 824 ms and continues dialing the digits, D1 to Dn . These digits are then stored in the redial memory. Each time the flash key is pressed, the redial memory will be cleared to store a new entry. In addition, the MODE IN status will be checked again for the setting of the TONE/PULSE DIALING mode. Similarly, to make sure that the IC is working properly, new flash key inputs will be ignored as long as the digits that were dialed have not finished. TEST CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 10 of 16 SC91214/91215 SERIES TIMING DIAGRAMS 1.Timing diagram in PULSE mode: 2. Timing diagram in TONE mode (i) Normal dialing (ii) After (i), redialing HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 11 of 16 SC91214/91215 SERIES 3. Timing diagram for SWITCHING mode operation: (i) By mode selection pin switches (ii) By */T key entry TPAU: Pause time (2.2 secs) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 12 of 16 SC91214/91215 SERIES 4. One key redial (DTMF mode used as example): TAOBK: Break time (2.2 secs) 5. Flash dialing (DTMF mode used as example): HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 13 of 16 SC91214/91215 SERIES TYPACAL APPLICATION CIRCUIT 100K 100K 20P 220K 100K A42 20P 0.47 47 1K 3.9V PULSE TONE 8050 200 0.1 2M 100 LED 0.47 8050 PIEZO 100k 0.02 8050 SPE HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 14 of 16 SC91214/91215 SERIES PACKAGE OUTLINE 7.62 3.00MIN 4.36MAX 0.25±0.05 UNIT: mm 6.35±0.25 DIP-16-300-2.54 DIP-18-300-2.54 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn UNIT: mm REV:1.0 2004.08.03 Page 15 of 16 SC91214/91215 SERIES PACKAGE OUTLINE(continued) DIP-20-300-2.54 UNIT: mm 2.54 1.27 15 degree 26.4±0.3 0.51MIN 0.51 HANDLING MOS DEVICES: Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: • Persons at a work bench should be earthed via a wrist strap. • Equipment cases should be earthed. • All tools used during assembly, including soldering tools and solder baths, must be earthed. • MOS devices should be packed for dispatch in antistatic/conductive containers. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2004.08.03 Page 16 of 16