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Part: EM91401BP
Category:
Communication
-> Telephony
-> Telephone Dialer
Description: Tone/pulse Switchable Dialer With LCD Interface And Dual Tone Melody Generator
Company: ELAN Microelectronics
Datasheet: Download EM91401BP datasheet File size : 65 kB
Request For quote: Find where to buy EM91401BP
Datasheet text preview:
TONE/PULTONSWITCHABLE DIALER WITH LCD INTERFACE SE E/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR AND DUAL-TONE MELODY GENERATOR
EM91401 SERIES EM91401 SERIES
ary relimin P
GENERAL DESCRIPTION
The EM91401 is a series of tone/pulse switchable dialers that is composed of T/P dialer. The EM91401 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. · 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 LNB KT EM91401A EM91401B EM91401C EM91401D Note : PDP = Pocket Dialer Prevented HOLD(music) LOCK HF SDO(LCD) PDP
* This specification are subject to be changed without notice.
10.1.1997
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EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR
EM91401
Pin Assignment
inary Prelim
EM91401AP
COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF
EM91401BP
COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS HFI 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF HFO
EM91401CP
SDO COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS HFI 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 HDO PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF HFO
EM91401DK
SDO COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS HFI DRING 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 HDO PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF HFO RMUTE
Keyboard Arrangement
ROW1 ROW2 ROW3 ROW4
COL1 1 4 7 */T
COL2 2 5 8 0
COL3 3 6 9 #
COL4/KT HD F RD/P
* This specification are subject to be changed without notice.
10.1.1997
2
EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR
ary relimin P FUNCTIONAL BLOCK DIAGRAM
RMUTE SDO HFO HDO COL1 COL2 COL3 COL4/KT COL5 XMUTE Row/Column programming counter Keyboard interface (column) Memory (Melody) XIN XOUT Oscillator latch & decoder D/A converter DTMF
Output circuit
Timing/Control circuit ROW1 ROW2 ROW3 ROW4 VDD HFI HKS DRING VDD Keyboard interface (Row) Input circuit Pulse generator PO
PIN DESCRIPTIONS
Symbol ROW1~ROW4 Function Keyboard scan pins of row group. In idle state (HKS is "High" and HFO is "Low"), these pins stay "High impedance" level to prevent power consumption. Otherwise, these pins switch to "High" level for detecting keyboard entry. These pins will output 600 Hz signal while keyboard is scanning. Keyboard scan pins of column group. In idle state, these pins stay "High impedance" level. Otherwise these pins switch to "Low" level for detecting keyboard entry. These pins will output 600 Hz signal while keyboard is scanning. The fourth column group pin of the keyboard that also provides the keytone output . Normally, this pin stays "Low" level for detecting keyboard entry. After a valid keyboard entry, this pin will output keying confirmation tone that is 600 Hz signal and 30 ms duration. To prevent signal interference, while DTMF issue, it will disable key tone output except function key. Oscillator input and output pins. A 3.579545 MHz crystal or ceramic resonator must be crossed connection to XIN and XOUT pins which generate system clock. The Tone/Pulse MUTE signal output pin that is NMOS open-drain output structure. This pin will switch to "Low" level during Tone/Pulse dialing and hold function . Otherwise, this pin stays "High impedance" level. Positive and negative power supply input pins. Recommended operating voltage from 2.0Vdc to 5.5Vdc. Handfree inputs pin which accepts falling edge signal to turn "on" or turn "off" handfree function. This pin is hysteresis input structure and built-in pull up resistor (typically 200 Kohms). Handfree outputs pin that is designed to control telephone line for on-hook dialing or control speakerphone circuit for handfree conversation. When handfree function is executed, this pin will switch to"High". Otherwise, this pin stays "Low" level. The DTMF (Dual Tone Multi-Frequency) and music signals output pin. Normally, this pin stays "Low" level. In Tone dialing mode, this pin will output DTMF signal that is corresponding to keyboard 0 .. 9, * and # keys. Beside this, in the line hold duration, this pin will issue dual-tone music for telephone line.
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COL1~COL3
COL4/KT
XIN and XOUT XMUTE
VDD and VSS HFI
HFO
DTMF
* This specification are subject to be changed without notice.
EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR
Symbol HKS
inary Prelim 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. Otherwise, this pin must be connected to "High" level to disable all function and prevent power consumption. Pulse signal outputs pin that is NMOS open-drain output structure. Normally, this pin stays "High impedance" level. In Pulse dialing mode and keypad was entry. This pin will output pulse trains signal that is corresponding to keyboard 0 .. 9 keys. Hold function output that is CMOS structure.Normally, this pin stays "Low" level. When Hold function is executing, this pin will output "High" level. This pin is designed to drive LED or peripheral circuit to indicate line is at Hold status. SDO function output that is NMOS open-drain structure. When there is a valid entry on keyboard, this pin will output a serial data. This serial data is designed to drive LCD driver to display dialing number on LCD screen or drive voice synthesizer to announce dialing number to speaker. The ring signal detect input pin which is internal pull up (built-in 100 Kohms resistor). While the Tel-ring is incoming, this pin must be connected to "Low" with delay to indicate the ringing . Otherwise, this pin must be connected to "High" level . Ring mute output pin that is NMOS open-drain structure. The RMUTE pin is designed to control microphone of handset to prevent the illegal dialing from pocket dialer. If the DRING pin is at "High" level , then Off-Hook or turn on Handfree , this pin will output "Low" level. In other words, the DRING pin is used to check the phone that receives an incoming call (DRING =Low input) or make an outgoing call (DRING= High input) . If the phone user make an outgoing call ,then RMUTE pin activated to prevent the illegal dialing from pocket dialer in the particular application.The RMUTE can be restored to "High" level when the first key entry is not the optioned lock-number .
PO
HDO
SDO
DRING
RMUTE
* This specification are subject to be changed without notice.
10.1.1997
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EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR
FUNCTION DESCRIPTIONS Dialing signal selection
ary relimin P
The EM91401 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. Mode ROW1 Mode R-Vdd 20 PPS NR Tone R-Vss 10 PPS c. Flash time ROW3 ROW4 NR NR NR R-Vss R-Vss NR R-Vss R-Vss e. Lock number COL2 COL3 NR NR NR R-Vss R-Vss NR R-Vss R-Vss b. M/B ratio ROW2 MBR (%) NR 40:60 R-Vss 33:66 d. Lock control method COL1 Control method R-Vdd key lock NR none lock R-Vss password lock
Tf (ms) 600 100 80 300 Lock number none 0 9 0.9
Normal dialing
Directly keying digital key on keyboard which number can be dialing output and stored in LNB memory automatically. Operating procedure described as follow : · To select Pulse or Tone mode. · Off-hook or turn on HF function. · Keying d1, d2, .. , dn. The "d" expressed digital keypad that included 1~9, *, 0, #, P, and PT keys. The "n" expressed unlimited. · The numbers d1, d2, .. , dn will be dialed out in Pulse or Tone mode as selection.
LNB redial memory
Storing: In normal dialing mode, every digital key was entry which number will be stored in LNB memory automatically. If entry digits are more than 32 digits, the redial function of LNB memory will be disabled. Otherwise, these numbers stored in LNB memory can be redial output. * This specification are subject to be changed without notice.
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