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GENERAL DESCRIPTION
The EM91421 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with
20-set memories. The EM91421 series provide necessary functions of telephone set for application in any
environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone ,and lock functions.
The lock function is designed to inhibit toll dialing operation. Beside this, melody generator, ring detector and
SDO (Serial Data Output) functions are provided in advance version. Melody generator will output dual-tone
music in line hold duration. Ring detector can prevent illegal dialing from pocket dialer. The SDO is designed
to drive LCD driver and voice synthesizer. In this application, the dialing numbers can be displayed on LCD
screen with EM32100 ( or EM32116 ).
FEATURES
• Tone/Pulse switchable.
•
Wide operating voltage from 2.0 V to 5.5 V.
•
Low operating current, 0.15 mA (Pulse) and 0.3 mA (Tone) typically.
• Adding resistor on keyboard scan pin that can select many telephone specifications, such as : Pulse rate,
M/B ratio, Flash time, lock dialing functions.
• SDO function supports LCD driver and voice synthesizer to indicate dialing numbers.
• Line hold function is designed for stopping conversation temporality.
• Melody generator provides music on hold function.
• Lock function provides conventionality key lock and password lock operations.
• Ring detector is designed to prevent illegal dialing from pocket dialer.
• 20-set one touch or (10-set one touch and 10-set two touch) repertory memory, each one can hold data up
to 16 digits.
• A 32-digit LNB (last number) redial memory.
• Keytone function provides rapidly keying recognition.
• Handfree function provides on-hook dialing and speakerphone application.
• Pause and P-T time are fixed to 3.6 seconds.
• Tone duration and inter-tone pause time are fixed to 98 ms.
• Using 3.579545 MHz crystal or ceramic resonator.
• Package forms: PDIP, skinny.
ORDERING INFORMATION
Versions list and function outline
VERSION
EM91421A
EM91421B
EM91421D
Note : PDP = Pocket Dialer Prevented
* This specification are subject to be changed without notice.
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
LNB
KT
HOLD(music)
√
√
√
√
√
√
AND DUAL-TONE MELODY GENERATOR
AND DUAL-TONE MELODY GENERATOR
LOCK
√
√
√
√
√
√
EM91421 SERIES
EM91421 SERIES
HF
SDO(LCD)
PDP
√
√
√
√
10.1.1997
1
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Summary of Contents for EMC EM91421 Series
- Page 1 The EM91421 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with 20-set memories. The EM91421 series provide necessary functions of telephone set for application in any environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone ,and lock functions.
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Page 2: Pin Assignment
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR EM91421 Pin Assignment EM91421BK EM91421AK ROW10 ROW9 ROW10 ROW9 ROW6 ROW5 ROW6 ROW5 COL5 COL5 COL4/KT COL4/KT COL3 ROW4 COL3 ROW4 COL2 ROW3 COL2 ROW3 COL1 ROW2 COL1... -
Page 3: Functional Block Diagram
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR FUNCTIONAL BLOCK DIAGRAM RMUTE HFO HDO XMUTE COL1 Row/Column Keyboard COL2 Output circuit programming counter interface COL3 COL4/KT (column) COL5 latch Memory DTMF & (Melody) converter decoder Oscillator... - Page 4 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR Symbol Function Control signal inputs pin that is corresponding hook switch status. When handset was left from cradle, this pin must be connected to “Low” level to operate all functions.
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Page 5: Function Descriptions
AND DUAL-TONE MELODY GENERATOR FUNCTION DESCRIPTIONS Dialing signal selection The EM91421 series incorporated a special keyboard scanning function that is connecting a resistor (typically is 560 Kohms) on keyboard scan pin to select many telephone specifications. The specifications are described as following : a. - Page 6 LNB memory will be dialed output. Repertory memory The EM91421 series incorporated several sets repertory memory and each one can store number up to 16 digits. These memories were designed to 20 sets types. As operating precedure, all of the memories can be separated to dirtect (one-touch) and indirect (two-touch) operation.
- Page 7 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR Pause (P) key operation The Pause (P) key is designed to support pause operation in dialing duration. “P” key can be stored in memory and it will occupy one digital position.
- Page 8 The dummy number “3” is not detected by the centered office or PABX ,but the following numbers “0” ,1,2,3... long distance call can be dialed out normally since the leading number “3” is not the Lock-number defined in EM91421 series. To prevent the unavoidable long distance call, then EM91421 series inhibits the key entry during Tdly.
- Page 9 Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level. Music on Hold EM91421 series built-in a melody generator to generate dual-tone music on DTMF output pin. The music is designed for telephone line at line holding. SDO (Serial Data Output) function The SDO is serial data output which format is same as UART protocol.
- Page 10 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR SDO Keypad Encoded table: ♦ Digital key (b5,b4=0,0) keypad “*”/T P */”T” output b3,b2,b1,b0 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 ...
- Page 11 AND DUAL-TONE MELODY GENERATOR LOCK function The EM91421 series provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1 pin to VSS can select different LOCK control method that is conventional key lock or password lock. Also the lock number that can be selected by connecting the resistors on COL2 or COL3 pin.
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Page 12: Absolute Maximum Ratings
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR keyboard entry. In actual application of the RMUTE pin is recommended connection to microphone of the phone handset to prevent that the dialing signal (DTMF) is coupling by the Microphone of the phone handset. -
Page 13: Electrical Characteristic
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR ELECTRICAL CHARACTERISTIC (Ambient temperature is 25°C, V =2.5V unless otherwise noted, all voltages referenced to Vss,Fosc=3.579545 MHz) Parameter Sym. Min. Typ. Max. Unit Condition Keyboard debounce time Key tone signal: frequency ○... - Page 14 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR DTMF output frequency (fosc = 3.579545 MHz) Keyboard scan pin CCITT standard (Hz) Actual output (Hz) Deviation (%) ROW1 (f1) 699.1 0.30 ROW2 (f2) 766.2 0.49 ROW3 (f3) 847.4...
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Page 15: Timing Diagram
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR TIMING DIAGRAM KEY IN XMUTE Tidp Tidp DTMF OSC. Tdly Hi-impedance Figure 1. Pulse mode operating timing KEY IN XMUTE Titp Titp DTMF OSC. Hi-impedance Figure 2. DTMF mode operating timing * This specification are subject to be changed without notice. - Page 16 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR LNB=2,3 RD/P KEY IN XMUTE Tidp Tidp DTMF OSC. Tdly Hi-impedance Figure 3. Pulse mode LNB redial timing LNB=2,3 RD/P KEY IN XMUTE Titp Titp DTMF OSC. Tdly Hi-impedance Figure 4.
- Page 17 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR RD/P KEY IN XMUTE Tidp Tidp DTMF OSC. Hi-impedance Figure 5. Pause key operating timing KEY IN XMUTE DTMF OSC. Hi-impedance Figure 6. Pulse to Tone (P→T) operating timing...
- Page 18 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR KEY IN sT b0 b1 b2 b3 b4 b5 spT spT Tbit Hi-impedance <Note>L=LSB,M=MSB, sT=START bit time, spT=STOP bit time Figure 8. SDO operating timing HD @ KEY IN...
- Page 19 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR Toff RING DRING RMUTE Figure 11. Timing of receiving an incoming call * The external ring detection circuit must send a low signal at the total ring cycle (Ton and Toff)
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Page 20: Application Circuit
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR APPLICATION CIRCUIT EM91421 series Application circuit * This specification are subject to be changed without notice. 10.1.1997... - Page 21 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR EM32100 Application Circuit : Package type : QFP 48 pins or chip form provided * This specification are subject to be changed without notice. 10.1.1997...
- Page 22 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR EM32116 Application Circuit : Package type : QFP 64 pins or chip form provided * This specification are subject to be changed without notice. 10.1.1997...
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Page 23: Package Information
EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR PACKAGE INFORMATION Example : 914XX P (1) ELAN MICRO. pefix (2) Type number (3) Package code: P→PDIP K→Skinny R→SDIP 18/20/28 Lead Plastic Package 18 PDIP 20 PDIP 28 PDIP... - Page 24 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR 22/24 Lead Plastic Package-Skinny 22 PDIP (skinny) 24 PDIP (skinny) MILIMETERS INCHES MILIMETERS INCHES MIN. MAX. MIN. MAX. MIN. MAX. MIN. MAX. 4.752 .180 4.572 .180 0.381 .015 0.381...
- Page 25 EM91421 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR 42 SDIP Package A A2 42 SDIP MILIMETERS INCHES MIN. MAX. MIN. MAX. 5.08 0.200 0.381 0.015 3.937 4.191 0.155 0.165 0.356 0.559 0.014 0.022 0.914 1.116 0.036 0.044...