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EM91215BP Schematic ( PDF Datasheet ) - ELAN Microelectronics Corp

Teilenummer EM91215BP
Beschreibung TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
Hersteller ELAN Microelectronics Corp
Logo ELAN Microelectronics Corp Logo 




Gesamt 19 Seiten
EM91215BP Datasheet, Funktion
EM9E1M2911521S5ESRERIEIESS
TONE/PULTSOENSEW/PUITLSCEHSAWBITLCEHDAIBALLE EDRIAWLEIRTWHILTHCDLCIDNITNETRERFFAACCEE
GENERAL DESCRIPTION
The EM91215 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with 13
set memories. The EM91215 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.
• 13 set one touch or (3 set one touch and 10 set two 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
EM91215A
EM91215B
EM91215C
LNB KT SAVE
√√
√√
√√
HF SDO(LCD) PMUTE
√√
√√
* This specification are subject to be changed without notice.
10.1.1997 1






EM91215BP Datasheet, Funktion
EM91215 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
number from 1~10 decided by dialers’ memory sets.
Indirect (two-touch) memory
• To select Pulse or Tone mode.
• Off-hook (or Turn on HF function), push A, n key. The numbers that are stored in indirect memory location
“n” will be dialed out in Pulse or Tone mode as selection. The “n” expressed digital key from 0 to 9.
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.
• To select Pulse or Tone mode.
• Off-hook (or turn on HF function), push d1, d2, .. , dn, RD/P, k1, k2, .. , kn . These numbers will be dialed
out as following sequence:
d1, d2, .. , dn, Tp, k1, k2, .. , kn.
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
HKS
Input/Output pin level
PO XMUTE
PM
(0) On-hook, idle state
HF
F
L
(1) Off-hook line
LF
F
L
(2) Off-hook, HF line
LF
F
L
(3) On-hook, HF line
HF
F
L
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
* This specification are subject to be changed without notice.
HFO
L
L
H
H
10.1.1997 6

6 Page









EM91215BP pdf, datenblatt
EM91215 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
HKS
KEY IN
KT
XMUTE
PM
SDO
PO
DTMF
OSC.
2 RD/P 3
Tp
Tidp Tidp
Figure 5. Pause key operating timing
Hi-impedance
HKS
KEY IN
KT
XMUTE
PM
SDO
PO
DTMF
OSC.
HKS
KEY IN
KT
XMUTE
PM
SDO
PO
DTMF
OSC.
2 */T 3
Tpt
4
Figure 6. Pulse to Tone (PT) operating timing
F
Tdb
Tf Tfp=300ms
Figure 7. Flash key operating timing
* This specification are subject to be changed without notice.
Hi-impedance
Hi-impedance
10.1.1997 12

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