EMC EM91850

EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
GENERAL DESCRIPTION
The EM91850 are tone/pulse switchable dialer with Last Number Redail (LNB) and SAVE function, which are
fabricate in CMOS technology with wide operating voltage for both tone and pulse mode. EM91850 consumes very
low memory retention current in on hook state. The EM91850 provide necessary functions of telephone set for
application in any environment, such as pulse dialing, tone (DTMF) dialing, handfree dialing. Beside this, hold , mute
and redial function are provide for particular operation. In redial mode EM91850 can auto insert pause time for
application in PABX system. EM91850 also have a special I/O pin - VAO can used tocontrol the receive volume
amplify circuit.
FEATURES
•
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Volume add Control Function.
One key Redial Function.
Flash key is available and have multiple Flash time ( 600 ms, 300 ms, 100 ms ) can be selected.
Auto Insert Pause Time.
Tone/Pulse Switchable.
Pulse mode fixed 10PPS.
Pulse to tone ( P→T ) key is provided for PABX operation.
Many options can be selected by R option.
Mode ( Pulse, Tone )
M/B ratio ( 40:60 ; 33:66 )
Auto insert pause time ( enable ; disable )
One set 32 digits SAVE function.
One set 32 digits LNB redial function.
Mixed and cascaded dialing.
Hold and Mute function.
Hand Free dialing.
Tone duration and inter -tone pause are fixed at 90 ms.
Flash pause time are fixed at 600 ms.
Pulse to Tone pause time are fixed at 3.6sec.
Uses 3.579545 MHz crystal or ceramic resonator (with built-in capacitor, no need extra capacitor).
Package in DIP 16.
Total System
• Operating voltage : 2.0V ~ 5.5V
• Operating current : Tone mode 0.3 mA (typical) ~ 0.5 mA
Pulse mode 0.15 mA (typical) ~ 0.2 mA
• Standby current : 0.01 uA ( typical ) 0.1 uA (max.)
• Use single clock 3.579545 MHz crystal
* This specification are subject to be changed without notice.
4.28.1999
1
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
PIN ASSIGNMENTS
in
P re l i m
ary
EM91850
K6/XMUTE
K5
K4/MUTEO
XIN
XOUT
VSS
VAO
HFI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
K3
K2
K1/HDO
DTMF
PO
HKS
VDD
HFO
PIN DESCRIPTIONS
Symbol
K2 , K3 , K5
I/O pin
K1/HDO
K4/MuteO
K6/XMUTE
VDD, VSS
Xin , Xout
HFI
HFO
HKS
DTMF
PO
VAO
Function
Key board scan I/O pins, key scans by ripple way.
These pins output 16K Hz signal one by one and periodically for key board scan.
This pin has two functions.
Normally this pin will be a Key board scan pins function same as K1~K6.
In Hold condition this pin will stay in "High" level to control the Hold circuit and scan HD
input key. In Hold condition all key will not allow keying except HD, HF and Hook switch.
This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K6.
In MUTE condition this pin will stay in "High" level and output signal with the inverse of key
scan to control the MUTE circuit and scan input key . Any key input will release MUTE
condition.
This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K6.
The Tone/Pulse dialing Mute signal output pin. This pin will switch to "High" level during
Tone/Pulse dialing and hold function. Otherwise, this pin DC level stays "Low".
Positive and negative power supply input pin
Oscillator input and output pins , built in two 5pf capacitor so it's not need external capacitor.
A 3.579545 MHz crystal must be crossed between Xin and Xout.
Handfree function Input pin accepts rising edge signal to turn "on" or turn "off" handfree
function. This pin is hysteresis input structure and built-in pull down resistor (typically 200
KΩ).
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.
Hook Switch detects input pin , which is hysteresis input structure and without internal pull
up resistor.
DTMF (Dual Tone Multi-Frequency) output pin, In tone dialing mode, this pin will output
DTMF signal that is corresponding to key board 0~9, *, # key.
Pulse signal output pin that is NMOS open-drain. This pin is for pulse dialing. This output is
"Low" during pulse dialing blank duration and Flash operation active, otherwise will be "High
impedance".
Volume Add output pin , which is open drain structure.
Normally this pin will stay in "High Impedance". When Volume add active and dialer in OFFHOOK mode operting then this pin will output "Low".
* This specification are subject to be changed without notice.
4.28.1999
2
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
Key Assignment :
K1
HD
K2
RD
SAVE
K3
1
2
3
4
5
6
MUTE
7
8
9
P
*/T
0
#
F1
K4
K5
K6
HDO
R
R
R_option
MuteO
VA
F3
F2
R
XMUTE
R_option
KEYBOARD DESCRIPTION :
Key
0~9,*,#
F1 , F2 , F3
*/T
RD
P
HD
HF
SAVE
VA
MUTE
Description
Digit key.
Flash key, flash time F1=600ms F2=300ms F3=100ms.
In Pulse mode, this key mean Pulse to Tone function key.
Redial and One key Redial key.
Pause key.
Hold function key, at hold mode to key in "HD" key will go to idle On-hook
state.
Handfree function key.
SAVE function key.
Volume Add key.
MUTE key. When this key be pressed MuteO output will be "high", and
any key-in will release mute.
* This specification are subject to be changed without notice.
4.28.1999
3
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
FUNCTION DESCRIPTIONS
in
P re l i m
ary
Dialer Option selection
The EM91850 incorporated a special keyboard scanning function that is connecting a resistor ( typically is
560 KΩ ) on keyboard scan pin to select many telephone specifications.
The specifications are described as follow :
a. M/B ratio
K2
M/B ratio
NR
40:60
R-Vss
33:66
b. Auto Insert Pause time
K3
Auto Insert
Pause time
NR
Disable
R-Vss
Enable
d. Mode
K5
Mode
NR
R-Vss
Tone
Pulse
Normal Dialing :
Press the digital key directly on keyboard which number can be dialing out and stored in LNB memory auto
matically. Operating procedure described as following:
• To select Pulse or Tone mode.
• Off-Hook or turn on HF function.
• Keying d1,d2,....dn. The "d" expressed digital key pressed that include 1~9, *, 0, #, P, and P→T keys. The "n"
expressed unlimited.
• The numbers d1,d2,......, dn will be dialed out in Pulse or Tone mode as selection.
LNB Redial Function :
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.
Redialing :
EM91850 provide Redial and One Key Redial function
(1) Redial function
Off-Hook normal dialing directly keying "F" key (or ON-OFF Hook once) and key-in "RD" keyboard.
The numbers stored in LNB memory will be dialed out.
(2) One Key Redial function
Off-Hook normal dialing, if busy, press the "RD" key directly then the line will be broken about 1.2 sec
with Trp redial pause time and dial out the numbers stored in LNB memory automatically.
* This specification are subject to be changed without notice.
4.28.1999
4
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Auto Insert Pause Time Function
in
P re l i m
ary
EM91850 Provides a new function - Auto Insert Pause Time function - for PABX system user. In PABX
system, we usually use a special number to identify the phone want dial out or just a internal phone. So between
the first and second number, the PABX system will switch to central office, that will be few second switch time.
The auto insert pause time function will auto insert the pause time between first and second digit in redialing mode.
This function are provide a pause time to wait PABX switch to Central Office. In fact, the pause time are record
the waiting time of last dialing between the first and second digit. The auto insert pause minimum duration are equal
0 second, maximun duration are equal 3.5 second, and pause duration scale are 0.1 second. So, if the time during
user keying first and second digit are longer than 3.5 second, the auto insert pause time will be limited at 3.5 second.
By this function, we can redial the correct number out in PABX system.This function can select enable or disable
by R_option.
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,, P , k1, k2, ..... ,kn). These numbers will be dialed out
as following sequence :
d1, d2,.....dn, Tp, k1, k2, ..... ,kn (Tp are the pause Time)
SAVE redial memory
The SAVE memory is designed in EM91850 to support digits capacity buffer for second redial, pager, special
memory for memo and other system applications.
Storing : EM91850 support two operating methods to store numbers into SAVE redial memory.
Method 1 :
• To select Pulse or Tone mode.
• Off-hook(or turn on HF function), push d1, d2 ....., dn. The numbers d1, d2,..., dn will be dialed out in Pulse
or Tone mode as selection.
• After dn had been dialed out and push [ST]. SAVE key. If the keying numbers are more than 32 digits that
content of SAVE memory can not be updated. Otherwise, these numbers will be stored into SAVE memory.
Noted : In the [ ] key allows to be omitted.
The SAVE buffer are the length 32 digits number
Method 2 :
On or Off-hook (or turn on HF function), push ST, d1, d2 ....., dn, [ST], SAVE. If the keying are not over 32 digits,
the numbers d1, d2, ....., dn will be stored in SAVE redial memory automatically.
Dialing
• To select Pulse or Tone mode.
• Off-hook(or turn on HF function or after executing Flash function), first push SAVE key. The numbers stored
in SAVE memory will be dialed out in Pulse or Tone mode as selection.
* This specification are subject to be changed without notice.
4.28.1999
5
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
Mixing dialing :
Let LNB=7,8,9
At off-hook state, key in "RD", *, 0, P, then the LNB=7, 8, 9, *, 0, P, and the number will be dialed out.
Pulse to Tone(*/T) key operation
The Pulse to Tone(*/T) key is designed to support toll dialing (long distance call) or PABX system operation.
The "*/T" key can be stored in memory and it will be occupy one digital position.
• To select Pulse mode.
• Off-hook(or turn on HF function), push d1, d2,...dn, */T, k1, k2, ....,kn. These numbers will be dialed out as
following sequence :
d1, d2,....dn, Tpt, k1, k2, ....., kn. (Tpt are the Pulse to Tone pause time)
(pulse mode)
(tone mode)
Flash(F=F1,F2,F3) key operation
The Flash key is designed to break telephone line temporarily. After key is depressed, this dialer will send a flash
signal to break line and reset all condition. The Flash's break time dependent on the which key be pressed,
F1=600ms, F2=300ms, F3=100ms.
Handfree (HF) function
The Handfree function are provided in EM91850 to support on-hook dialing and loudspeaker application which
can be turn "on" or "off" by pressed again "HF" key. During handfree function is executed, the HFO pin is switched
to "high". Otherwise the HFO pin stays "low" level. One of the following operations can turn off Handfree func
tion (HFO pin return to "Low").
• On-Off hook once.
• Pressed "HF" key
• Turn on Hold (HD) function.(HDO pin switched to "High")
Hold (HD) function
The Hold function is designed to stop conversation temporarily. In off-hook state (or HF function is turned on),
to press HD key on the keyboard, the Hold function can be turned "on" (HDO pin switched to “High”). One of the
following operations can turn off Hold function (HDO pin switched to "Low").
• On-Off hook once.
• To press HD key back to idle On_Hook state
• Turn on Handfree (HF) function.(HFO pin switched to "High")
** In Hold state all key board will be disable except "HF" , "HD" key and HKS switch
Mute function
The EM91850 provide mute function to mute microphone or antler at off-hook (or turn on HF) state. When keyin "MUTE" key, "MuteO" pin will become "High" to mute microphone. Any key-in will release mute mode and
operating the correct key.
* This specification are subject to be changed without notice.
4.28.1999
6
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
Volume add function
EM91850 provide Volume Add function to control the speech network for adding the receiving volume. Except
idle On-Hook state, Volume add function will working effect no matter what state is. Volume add function are
toggle structure. Every time touch VA key will inverter the VAO pin condition ( H→L→H→L→.....). So Volume
add will active or release each time keying VA. If and only if, when dialer back to the idle On_Hook state then
the Volume add function will force to release. This solution protect the user will not be hurt by loud volume.
Although Volume add state will not change by Off_Hook or HF operation but if dialer are in HF mode then
Volume add outpout (VAO) will be inhibited.
Noted : Except dialer back to idle state, any other operate will not reset volume add situation ( include HD,
HF , Flash ..... , and so on ). So volume add situation will be hold until dialer back to idle.
* This specification are subject to be changed without notice.
4.28.1999
7
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
OPERATING FLOW CHART
HF
(1)
HF
ary
On_Hook
state
HKS=L
HKS=H
(4)
On_Hook
HF
state
(2)
Off_Hook
state
HKS=L
HD
HD
HKS=H
HF
(6)
On_Hook
HD
(3)
Off_Hook
HF
HD
HF
HD
HF
HF
HKS=H
HD
(5)
Off_Hook
HD
HKS=L
<Note> : HF=Handfree
HD=Hold
Truth Table :
Operating state
HKS
Input / Output pin level
PO
XMUTE
HFO
HDO
(1)On-hook, idle state
(2)Off-hook line
H
L
Z
Z
L
L
L
L
L
L
(3)Off-hook, HF line
(4)On-hook, HF line
L
H
Z
Z
L
L
H
H
L
L
(5)Off-hook, HD line
(6)On-hook, HD line
L
H
Z
Z
H
H
L
L
H
H
Note : Z= floating (high impedance) ; H= logic "High"; L= logic "Low" level.
@ = To doing R-option
* This specification are subject to be changed without notice.
4.28.1999
8
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
ABSOLUTE MAXIMUM RATINGS(Ambient temperature is 25oC, all voltages referenced to VSS)
Items
Sym.
Power supply voltage
Input voltage range
Operating temperature
Storage temperature
Power consumption
Rating
VDD
VIN
TOPR
TSTO
PD
Unit
6.0
VSS-0.3V ~ VDD+0.3V
0 ~ +70
-55 ~ 150
500
V
V
o
C
o
C
mW
RECOMMENDED OPERATING CONDITIONS
1. Supply voltage range from 2 V to 5.5 V at fc=3.58 MHz
2. Operation frequency: 3.58 MHz crystal.
D.C. ELECTRICAL CHARACTERISTICS
(VSS=0V; TOPR=0oC to 70oC, VDD=3V unless otherwise noted)
Parameter
Operating voltage
Sym. Min.
Tone
Pulse
Memory retenion
Standby current
Operating current
Memory retention current
HKS, HFI
Input voltage
HFO
Drive current
Sink current
HFO pull down resistor
VAO
Leakage current
Sink current
MuteO, HDO, XMUTE
Drive current
Sink current
K2, K3, K6
Output current
PO Sink current
Tone
Pulse
2.0
2.0
1.0
Istby
IDD
Imrt
ViH 0.7
ViL Vss
IoH -0.2
VDD
Typ. Max. Unit
0.001
0.15
0.3
0.15
0.001
-
5.5
5.5
5.5
0.1
0.3
0.5
0.3
0.1
1
0.3
-
unload
µA
mA
mA
Idle On_Hook state
uA
V DD
HKS=1,Vdd=1V
Schmitt trigger
mA
Vo=2.5V
200
-0.01
uA
Vo=0.5V
KΩ
Vxmute=Vdd
mA
uA
Vxmute=0.5V
Vo=2.5V
IoL
Rhf
IoH
0.2
-
-
IoL
IoH
1
-270
-350
-420
IoL
IoH
IoL
IoL
10
-270
10
1
20
-350
20
1.5
50
-420
50
2
* This specification are subject to be changed without notice.
V
Condition
uA
mA
Vo=0.5V
Vo=2.5V
Vo=0.5V
Vo=0.5V
4.28.1999
9
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
DTMF CHARACTERISTICS (VSS= 0V , VDD= 3V , Topr = 0oC to 70oC)
Symbol
Twist
DC level
Dist
Ac level
Sink current
Load resistor
Minimum tone duration
Minimum intertone pause
Description
Twist=20 LOG(COL/ROW)
Vdc , Vdd=2.0V~5.5V
Distortion
Row group
Vdtmf=0.5V
Dist<-23dB
Td ( redial )
Titp ( redial )
Min.
1
0.55
130
0.2
5
-
Typ.
2
-30
155
90
90
Max.
3
0.7
-23
180
-
Unit
dB
Vdd
dB
mVrms
mA
KΩ
ms
ms
ACTUAL FREQUENCY OUTPUT ( fosc =3.579545 Hz )
F1
F2
F3
F4
F5
F6
F7
Standard (Hz )
697
770
852
941
1209
1336
1477
Output ( Hz )
699
766
848
948
1216
1332
1472
Deviation ( % )
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
ELECTRICAL CHARACTERISTIC
(VDD-VSS=3.0V,Fosc=3.58 MHz)
Parameter
Sym.
Min.
Typ.
Keyin or release debounce
Pulse rate
Make/Break ratio
Tdb
PSR
MBR
Inter-digit pause time
Pause time
Pulse to tone time
Flash break time
Tidp
Tp
Tpt
Tf
-
18
10
40:60
33:66
800
3.6
-
0
-
600
300
100
600
90
1.2
1
1/32
0.25
2.25
5
3100
-
Flash Pause time
Tone duration
One key redial Break time
One key redial Pause time
Scan wave width
Scan wave period
Key board scan Period
Auto Insert Pause
Pre-Mute time
Tfp
Td
Trb
Trb
Tsw
Tsp
Tksp
Taip
Tpm
* This specification are subject to be changed without notice.
Max. Unit
ms
pps
%
Condition
K2 pin=NR
K2 pin=R-Vss
ms
S
mS
F1 key
F2 key
F3 key
mS
mS
S
S
mS
mS
mS
mS
mS
4.28.1999
10
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
TIMING DIAGRAM
ary
HKS
1
KEY
XMUTE
2
3
Tdb
Tpm
Titp
DTMF
Td
PO
XOUT
Figure 1. Tone Mode operating Timing
HKS
1
KEY
2
3
Tdb
Tdb
XMUTE
Tpm
PO
Tidp
Tidp
Tidp
tB
DTMF
XOUT
Figure 2. Pulse Mode operating Timing
* This specification are subject to be changed without notice.
4.28.1999
11
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
Pulse
KEY
1
2
ary
Tone
*/T
3
4
XMUTE
Tpt
DTMF
PO
XOUT
Figure 3. Pulse to Tone operating Timing
KEY
F
1
dial inhibited
2
Tf
Tfp
3
XMUTE
PO
XOUT
Figure 4. Flash operating Timing
Tone mode
KEY
1
Pulse mode
P
2
1
P
2
Tp
XMUTE
Tp
DTMF
PO
XOUT
Figure 5. Pause operating Timing
* This specification are subject to be changed without notice.
4.28.1999
12
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
HKS
KEY
5
0
7
7
9
7
Taip
DTMF
Td
XOUT
Dialing 057797 so LNB=057797 and Taip timng will be store
Then Redial will auto insert Taip timing between RD number 0 and 5
HKS
KEY
RD
Titp
DTMF
Taip
0
5
7
7
9
7
Td
XOUT
Figure 6. Auto Insert Time operating Timing
(LNB=1 2 3)
HKS
KEY
RD
XMUTE
PO
XOUT
Figure 7. Redail operating Timing( Pulse Mode )
* This specification are subject to be changed without notice.
4.28.1999
13
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
(LNB=1 2 3)
HKS
KEY
RD
XMUTE
DTMF
XOUT
Figure 8. Redial operating Timing( Tone Mode )
LNB= 1 2
HKS
KEY
1
2
RD
XMUTE
PO
Trb
Trp
XOUT
Figure 9. One key Redial operating Timing( Pulse Mode )
LNB= 1 2
HKS
KEY
1
2
RD
XMUTE
PO
Trb
Trp
DTMF
XOUT
Figure 10. One key Redial operating Timing( Tone Mode )
* This specification are subject to be changed without notice.
4.28.1999
14
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
Tdb
HFI
HFO
1
KEY
2
RD
LNB = 1 2
XMUTE
PO
Torf
Trdp
XOUT
Figure 11. Handfree Mode One key Redial operating Timing( Pulse Mode )
Tdb
HFI
HFO
KEY
1
2
RD
LNB = 1 2
XMUTE
DTMF
Torf
Trdp
PO
XOUT
Figure 12. Handfree Mode One key Redial operating Timing( Tone Mode )
* This specification are subject to be changed without notice.
4.28.1999
15
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
HKS
Tdb
HFI
Tdb
HFO
KEY
HF
HD
HF
HD
HD
HD
HD
Tdb
Tdb
K1/HDO
HD
XMUTE/K6
K2~K6
XOUT
Figure 13. Handfree and Hold operating Timing
HKS
KEY
1
MUTE
Tdb
2
Tdb
MuteO/K4
XMUTE
DTMF
XOUT
Figure 14. Mute operating Timing
* This specification are subject to be changed without notice.
4.28.1999
16
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
Tsp
K1
Tsw
K2
K3
K4
K5
K6
Tksp
Figure 15. Key board scan Timing
HKS
HD
KEY
Tsp
HD
Tdb
K1
Tsw
K2 ~ K6
Figure 16. Hold active Key board scan Timing
* This specification are subject to be changed without notice.
4.28.1999
17
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
K1
ary
Tsp
Tsw
K2
K3
K4
K5
K6
Tksp
Figure 17. Mute active Key board scan Timing
K1
Tsp
Tsw
K2
K3
K4
K5
K6
Tksp
Figure 18. XMUTE active key board scan Timing
* This specification are subject to be changed without notice.
4.28.1999
18
RING
TIP
-
+
* This specification are subject to be changed without notice.
103
HF
104
1N4148
22K
220K
1N4148
100K
104
47K
100K
103
104
1N4148
VDD
+
1U
C945
C945
470K
47K
C945
3.58M
1N4148
240K
8
7
6
5
4
3
2
1
1N4148
PO
HKS
VDD
HFO
VSS
VAO
HFI
DTMF
K1/HDO
K2
K3
XOUT
XIN
K4/MuteO
K5
K6/XMUTE
9
10
11
12
13
14
15
16
33K
33K
100K
220K
104
HDO
HFO
/PO
EM91850
100K 104
33K
1N4148
1N4148
16V/1W
100K
3K3
A92
A42
ON-HOOK
10M
1u
+
C945
470u
470K
1N4148
+
0.1u
5V1
1N4148
LED
1K
10K
K6
K5
K4
K3
K2
K1
XMUTE
MuteO
/VAO
HFO
DTMF
I_LOOP
SPEAK_Power
KEYBOARD
Network
SPEECH
APPLICATION CIRCUIT : CONTROL CIRCUIT
in
P re l i m
100K
+
47K
10U
470K
47K
Auto Release HOLD Function
Circuit
HOOK-SW
OFF-HOOK
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
ary
4.28.1999
19
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
in
P re l i m
ary
APPLICATION CIRCUIT : KEYBOARD AND R_OPTION
K1
HD
K2
RD
SAVE
K3
1
2
3
4
5
6
MUTE
7
8
9
P
*/T
0
#
K4
K5
VA
K6
F1
F2
F3
AIP
T/P
MBR
* This specification are subject to be changed without notice.
560K
R_Option
4.28.1999
20