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EM91220C Schematic ( PDF Datasheet ) - ELAN Microelectronics Corp

Teilenummer EM91220C
Beschreibung TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
Hersteller ELAN Microelectronics Corp
Logo ELAN Microelectronics Corp Logo 




Gesamt 20 Seiten
EM91220C Datasheet, Funktion
EM9E1M2921022S0ESRERIEIESS
TONE/PULTSOENSEW/PUITLSCEHSAWBITLCEHDAIBALLE EDRIAWLEIRTWHILTHCDLCIDNITNETRERFFAACCEE
GENERAL DESCRIPTION
The EM91220 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with
20-set memories . The EM91220 series provides necessary functions of telephone set for application in any
environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone , mute and pulse
mute functions. Beside this, SDO (Serial Data Output) functions is provided in advance version that 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, Pause time, P-T wait time and keyboard type.
• SDO function supports LCD driver and voice synthesizer to indicate dialing numbers.
• Handfree function provides on-hook dialing and speakerphone application.
• 20-set three touch repertory memory, each one can store data up to 16 digits.
• A 32-digit LNB (last number) redial memory.
• A 32-digit SAVE redial memory.
• Keytone function provides rapidly keying recognition.
• Pulse mute function supports pulse dialing application.
• Using 3.579545 MHz crystal or ceramic resonator.
• Package forms: PDIP, skinny.
ORDERING INFORMATION
Versions list
VERSION
EM91220A
EM91220B
EM91220C
LNB KT SAVE
√√
√√
√√
HF SDO(LCD) PMUTE
√√
√√
* This specification are subject to be changed without notice.
10.1.1997 1






EM91220C Datasheet, Funktion
EM91220 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
Pulse to Tone (*/T or P-T) key operation
The Pulse to Tone (*/T or P-T) key is designed to support toll dialing (long distance call) or PABX system
operation. The "*/T (or P-T)" key can be stored in memory and it will occupy one digital position.
• To select Pulse mode.
• Off-hook (or turn on HF function), push d1, d2, .. , dn, */T, (or P-T) k1, k2, .. , kn. These numbers will be dialed
out as following sequence:
d1, d2, .. , dn, Tpt, k1, k2, .. , kn.
(pulse mode)
(tone mode)
Flash (F) key operation
The Flash (F) key is designed to break telephone line temporarily. After F key is depressed, this dialer will send
a flash signal to break line 600 ms, 300 ms, 100 ms or 80 ms as ROW3 and ROW4 selection.
Handfree (HF) function
The handfree function is designed to support on-hook dialing and loudspeaker application which can be turn “on”
or “off” with falling edge signal from HFI pin. During handfree function is executed, the HFO pin is switched
to “high”. Otherwise the HFO pin stays “low” level.
Truth table
Operating state
(0) On-hook, idle state
(1) Off-hook line
(2) Off-hook, HF line
(3) On-hook, HF line
HKS
H
L
L
H
Input/Output pin level
PO XMUTE
PM
FF
L
FF
L
FF
L
FF
L
HFO
L
L
H
H
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
SDO (Serial Data Output) function
The SDO is serial data output which format is same as UART protocol. SDO function is designed to drive LCD
driver and voice synthesizer. So the dialing numbers can be display on LCD screen with EM32100 (or EM32116
). The SDO signal consists of two start bits, six data bits and two stop bits. Each bit time is about 3.9 ms (256 Hz)
and output sequences are following by start bits, data bits (LSB to MSB) and stop bits.
ready
0 1 bit 0 bit1
start bits
bit2 bit3
data bits
bit4
bit5
01
stop bits
* This specification are subject to be changed without notice.
10.1.1997 6

6 Page









EM91220C pdf, datenblatt
EM91220 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
LNB=2,3
HKS
KEY IN
KT
XMUTE
PM
SDO
PO
DTMF
OSC.
RD
Tdb
Tkt
Tm
Tidp
T T TT
b m bm
Tidp
Figure 3. Pulse mode LNB redial timing
LNB=2,3
HKS
KEY IN
KT
RD
Tdb
XMUTE
PM
SDO
PO
DTMF
Tsdo
Td
Titp
OSC.
Td
Titp
Figure 4. DTMF mode LNB redial timing
* This specification are subject to be changed without notice.
Hi-impedance
Hi-impedance
10.1.1997 12

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