icm7101d low cost single chip telephone ic

ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
FEATURES
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OVERVIEW
Include Dialer, Speech, and Ringer
Circuit in Single Chip, Replacing Two
or More ICs
Single Board Design Meets Multiple
PTT Requirements.
Operating Range From 15 to 100mA
Selectable Make-Break Ratio
Tone/Pulse Dialing
32 Digit Last Number Redial
Ring Frequency Discrimination
2-tones Melody Generator
ICM7101D is a single chip telephone CMOS
integrated circuits that meets multiple PTT
requirements, allowing phone manufacturers
to have single board design for various
countries. This reduces inventory and simplify
manufacturing processes.
ICM7101D integrates dialer, speech, and
ringer circuits. The integration reduces
component counts, hence increases product
reliability.
TYPICAL APPLICATION CIRCUIT
Typical application circuit is as specified in Appendix A.
PACKAGE
28-Lead SOIC
AGND 1
28 STB
VDD 2
27 RXI
VDDI 3
26 RXO
GND 4
25 CI
TXO 5
24 M1
VL 6
23 M2
LLC 7
FOPT0 8
Rev. 2.4
SOIC
22 R1
21 R2
MFL0 9
20 R3
HS/DPB 10
19 R4
OSC1 11
18 C1
OSC2 12
17 C2
RGD 13
16 C3
MO 14
15 C4
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
PIN DESCRIPTION
Pin No
Symbol
1
2
AGND
VDD
Analog Ground
Supply Voltage
3
VDDI
Supply Input Voltage
Power for the chip is extracted from this pin
4
GND
Ground
5
TXO
Transmit Output
Transmit output to be connected to external power transistor for the
modulation of line voltage and for shorting the line during make period of pulse
dialing.
6
VL
7
LLC
8
FOPT0
9
MFL0
10
HS/DPB
11
OSC1
12
OSC2
13
RGD
14
MO
15
16
17
18
19
20
21
22
23
24
C4
C3
C2
C1
R4
R3
R2
R1
M2
M1
25
CI
26
RXO
27
RXI
28
STB
Rev. 2.4
Description
Line Voltage
Line Loss Compensation
0V = No LLC;
AGND=Low LLC;
VDD=High LLC.
Flash Option
FOPT0=0 - 100ms
FOPT0=1 - 600ms
DTMF Level Option
MFL0=0 - Low DTMF (~ -8/-10dB for ZAC=600ohm)
MFL0=1 - High DTMF (~ -6/-8dB for ZAC=600ohm)
Hook Switch Input and Dial Pulse Output
When off-hook, this pin is pulled high by the hook switch. During pulse dialing,
this pin is pulled low during break periods.
Oscillator Input
3.58MHz ceramic resonator input.
Oscillator Output
Ring Detection Input
Input for ring frequency detection.
Melody Output
Melody pulse output for tone ringer.
Keypad Columns
Keypad column inputs.
Keypad Rows
Keypad rows. These pins are also used to determine the operating mode.
Microphone Inputs
Input for electret microphone.
Complex Impedance and AC Impedance Input
Placing resistor between CI and AGND pins adjusts the AC impedance. If
there is no such resistor the typical AC impedance is 1000 ohm.
Receive Output
These outputs drive a dynamic earpiece.
Receive Input
Input for received signal.
Side Tone Balance Input
Side tone cancellation input.
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
FUNCTIONAL DESCRIPTION
SYSTEM STARTUP
ICM7101D generates internal power-on-reset
when VDD reaches around 1.5V. Power-onreset appropriately initiates the system to a
known initial state.
ICM7101D stays in shutdown mode so long as
HS/DPB pin stays LOW. However, the ringer
circuitry is activated in this mode to monitor the
incoming ringing signal.
OSCILATOR
All the timing of ICM7101D is based on a clock
frequency of 3.58 MHz. A Crystal or ceramic
resonator of this frequency should be
connected to oscilator pins of ICM7101D. Care
has to be taken in selecting this components
since in practise minor deviations from the
nominal frequency may occur due to the
characteristics of the oscillator.
It is recommended to connect a small value
capcitors (≤ 47pF) in parallel with the oscillator
to ensure start-up and or operation at the
nominal frequency.
TONE RINGER
The tone ringer of ICM7101D consists of ring
detection circuit and melody generator circuit.
Ring Detection Circuit
Ring detection circuit will assures the signal
that present on RGD pin input is valid. The
signal is considered as a valid signal if the
signal has frequencies between 13Hz and
70Hz.
Melody Generator
Once the valid ring signal is detected on the
Ring Detection (RGD) pin and is present for
about 75 ms continously, the melody generator
will be actived, the ring signal will be monitored
continously and the melody generator will be
immediately turn on or off according to the
momentary presence of a valid or unvalid ring
signal respectively until next power on reset or
off-hook. The melody generator of ICM7101D
creates 2 frequencies of 874Hza and 1250Hz.
Rev. 2.4
SPEECH NETWORK
The speech network of ICM7101D consists of
a transmitter and a receiver path, side tone
cancellation and line loss compensation.
The speech network is activated as soon as
the phone goes off-hook (i.e. when HS/DPB
pin goes HIGH). At the same time the ringer
circuitry is deactivated.
Transmit
For 600 ohm termination, the transmit gain
from microphone input to the line voltage is
35dB.
Receive
Receive path gain is 3dB for 600 ohm
termination.
Side Tone Cancellation
As shown in the typical application circuit in
Appendix A, side tone cancellation can be
achieved best by balancing the Whitestone
bridge comprised of R11, R12, R13+R14//C6,
and the line impedance.
Line Loss Compensation
LLC input level is scanned as the phone goes
off-hook (i.e. as HD/DPB pin goes HIGH). At
the same time, the loop current level is sensed
and determined. If LLC=0, no compensation
scheme is in effect.
If LLC=AGND, “low” compensation scheme is
in effect. Transmit and receive gains are
reduced by as much as 6dB when the loop
current exceeds 50mA.
If LLC=VDD, “high” compensation scheme is in
effect. Transmit and receive gains are reduced
by as much as 6dB when the loop current
exceeds 75mA.
AC Impedance
Placing a resistor between CI and AGND pins
adjusts the AC impedance. If such resistor is
not present, the typical AC impedance is 1000
ohm.
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
DTMF Level
When the AC Impedance is set to 600ohm,
DTMF Level is determined by MFL0 pin as
follow:
MFL0
0
1
DTMF Level
-8/-10 dB
-6/-8 dB
DIALING FUNCTIONS
Keypad arrangement is as shown in the typical
application circuit in Figure 1. Dialing modes
are selectable using the pull-up/pull-down
resistors connected to the row inputs. As soon
as the phone goes off-hook (i.e when HS/DPB
pin goes HIGH), voltage levels on keypad row
inputs (R1 thru R4) are first scanned to
determine the operating mode as follow:
Pin
R1
Function
Dialing Mode
R2
LD Period
R3
Make/Break
Ratio
DTMF option
R4
Level – Mode
0 – MF mode
1 – LD mode
0 – 10 PPS
1 – 20 PPS
0 – 33/67
1 – 40/60
0 – 82ms/82ms
1 – 82ms/160ms
Valid Keys
ICM7101D has a total of 15 valid keys. It scans
the keys by asserting known state on pins R1,
R2, R3, and R4 in sequence, and check which
column (pins C1, C2, C3, C4) is shorted to
which row. The following specify the
combinations:
R1
R2
R3
R4
C1
1
4
7
*
C2
2
5
8
0
C3
3
6
9
#
Last Number Redial (LNR)
The last Number Redial (LNR) is a facility of
ICM7101D to allow resignalling of the last
manually dialled number without keying in all
digits again. The LNR is repeatable after each
off-hook.
A manually entered number is stored in a RAM
of ICM7101D. The capacity of RAM is 32
digits.
Flash
ICM7101D assert line break (pull down
HS/DPB pin) when Flash key is depressed.
The flash duration depends on the FOPT0 as
follow:
FOPT0
0
1
Flash Duration
100 ms
600 ms
Mute
ICM7101D turns off the microphone input from
M1 and M2 pins when Mute key is depressed.
Depressing the key again toggle the mute
function.
Pause
ICM7101D pauses (no dialing and microphone
is muted) for 2.2 seconds when Pause key is
depressed.
C4
Pause
Mute
Flash
LNR
DTMF Tones
The DTMF Tone Generator creates 12 tones in
compliance with CCITT Recommendation.
There are two group of frequencies of DTMF
tones. The low group depends on the key’s
row, while the high group depends on the key’s
column as illustrated in the following table:
R1
R2
R3
R4
High
Freq
Rev. 2.4
C1
1
4
7
*
1209
Hz
C2
2
5
8
0
1336
Hz
C3
3
6
9
#
1477
Hz
Low Freq
697 Hz
770 Hz
852 Hz
941 Hz
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
ABSOLUTE MAXIMUM RATING
Symbol
VDDI
VIN
TSTG
TSOL
Parameter
Value
Supply Line Voltage
Digital Input Voltage
Storage Temperature
Soldering Temperature
Unit
-0.3 to 7.0
-0.3 to 7.0
-55 to +150
300
V
V
o
C
o
C
Note 1: Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods
may affect reliability.
OPERATING RANGE
Range
Commercial
Ambient Temperature
o
-25 C to 70 oC
ELECTRICAL CHARACTERISTICS
(ILINE = 15mA unless otherwise specified)
Symbol
VDDI
IDD
Parameter
Min
Max
Unit
ILINE: 13mA to 100mA
4.5
V
Operating Current
Speech mode
Tone Dialing
Pulse Dialing VDD = 2.5V
Ring mode
VDD = 2.5V
3
4
0.2
0.3
mA
mA
mA
mA
VOL = 0.4V
1.5
mA
Output Current, Sink
TXD, HS/DPB, MO
VIL
Input Voltage Low
VIH
Input Voltage High
Transmit (TX)
GTX
Transmit Gain
THD
Distortion
ZIN
Input Impedance
GMUTE
Mute Attenuation
Input Voltage Range
Receive (RX)
GRX
Receive Gain
THD
Distortion
ZIN
Input Impedance (RI)
VIN RXI
Input Voltage Range
Output Driver (BJT)
VIN MAX
Input Voltage Range
VTX
Dynamic Range
RL
Return Loss
Side Tone (ST)
GST
Side Tone Cancellation
VIN ST
Input Voltage Range
o
HS/DPB, RGD TA=25 C
HS/DPB, RGD TA=25oC
VSS
0.7
34
35
VIL < 0.5 VRMS
0.3
1
VDD
VDD
36
2
dB
%
KΩ
dB
Vpp
Vpp
6
2
dB
%
KΩ
VPEAK
20
Mute activated
Differential
Single Ended
60
+/- 1
+/- 0.5
2
3
VRXI < 0.5 VRMS
8
+/- 2
+/- 2
+/- 2
ZRL= 1000Ω
Keyboard
tD
Key debounce time
Rev. 2.4
Typ
Regulated Line
Voltage
IOL
VIN M1,M2
Test Conditions
ICmic reserves the right to change the specifications without prior notice
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26
VPEAK
VPEAK
dB
+/- 2
dB
VPEAK
64
ms
5
ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
HS/DPB INPUT
tHS-L
Low to High Debounce
tHS-H
High to Low Debounce
Tone Ringer
VMO
Melody Output
tMD
Melody Delay
F1
Frequency 1
F2
Frequency 2
tDT
Detection Time
Min. Detection
fMIN
Frequency
Max. Detection
fMAX
Frequency
DTMF
F
Frequency Deviation
tTD
Tone Duration
tITP
Inter Tone Pause
Going off-hook
Going on-hook
15
15
ms
ms
PDM
10
874
1250
Ring Freq = 20Hz
50
80
13
note 5
note 1
note 1
-0.31
80
80
ms
Hz
Hz
ms
Hz
82
82
70
Hz
+0.75
84
84
%
ms
ms
Note 1: The values are valid during automatic dialing and are minimum values during manual dialing, i.e. the tones will continue
as long as the key is depressed.
Note 3: Relative to high group
Note 5: This does not include the frequency deviation of the ceramic resonator.
Rev. 2.4
ICmic reserves the right to change the specifications without prior notice
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
APPENDIX A: TYPICAL APPLICATION CIRCUIT
Rev. 2.4
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
PACKAGE INFORMATION
28-Lead SOIC (Unit: Inches)
Rev. 2.4
ICmic reserves the right to change the specifications without prior notice
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ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
DISCLAIMER
The information contained herein is current as of the date of publication; however, delivery of this
document shall not under any circumstances create any implication that the information contained
Rev. 2.4
ICmic reserves the right to change the specifications without prior notice
9
ICM7101D
LOW COST SINGLE CHIP TELEPHONE IC
herein is correct as of any time subsequent to such date. ICmic reserves the right to make changes
without notification, even if such changes would render information contained herein inaccurate or
incomplete. ICmic makes no representation or warranty that any circuit designed by reference to the
information contained herein, will function without errors and as intended by the designer.
Rev. 2.4
ICmic reserves the right to change the specifications without prior notice
10