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PDF ICM7101D Data sheet ( Hoja de datos )
| Número de pieza | ICM7101D | |
| Descripción | LOW COST SINGLE CHIP TELEPHONE IC | |
| Fabricantes | ICmic | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ICM7101D (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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FEATURES
• 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
TYPICAL APPLICATION CIRCUIT
OVERVIEW
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.
Rev. 2.0
ICmic reserves the right to change the specifications without prior notice
1
1 page  
DTMF Level
When the AC Impedance is set to 600ohm,
DTMF Level is determined by MFL0 pin as
follow:
MFL0 DTMF Level
0 -8/-10 dB
1 -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 Function
Level – Mode
R1 Dialing Mode 0 – MF mode
1 – LD mode
R2 LD Period
0 – 10 PPS
1 – 20 PPS
R3 Make/Break 0 – 33/67
Ratio
1 – 40/60
R4 DTMF option 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:
C1 C2 C3 C4
R1 1 2 3 Pause
R2 4 5 6 Mute
R3 7 8 9 Flash
R4 * 0 # 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
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
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.
Rev. 2.0
ICmic reserves the right to change the specifications without prior notice
5
5 Page 
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
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. 2.0
ICmic reserves the right to change the specifications without prior notice
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ICM7101D.PDF ] | |
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