ICM7101D IC MICROSYSTEMS, ICM7101D Datasheet - Page 4

• Manufacturer Part Number: ICM7101D
• Description: Low Cost Single Chip Telephone Ic
• Manufacturer: IC MICROSYSTEMS

DTMF Level
When the AC Impedance is set to 600ohm,
DTMF Level is determined by MFL0 pin as
follow:
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:
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
combinations:
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:
Rev. 2.4
Pin
R1
R2
R3
R4
R1
R2
R3
R4
MFL0
High
Freq
R1
R2
R3
R4
0
1
row.
C1
Function
Dialing Mode
LD Period
Make/Break
Ratio
DTMF option
1
4
7
*
1209
DTMF Level
-8/-10 dB
-6/-8 dB
C1
Hz
1
4
7
*
The
ICmic reserves the right to change the specifications without prior notice
C2
2
5
8
0
1336
C2
Hz
2
5
8
0
following
C3
3
6
9
#
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
1477
C3
Hz
3
6
9
#
Pause
Flash
Mute
LNR
C4
L
specify
Low Freq
697 Hz
770 Hz
852 Hz
941 Hz
OW
C
the
OST
S
INGLE
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:
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.
FOPT0
0
1
C
Flash Duration
100 ms
600 ms
HIP
ICM7101D
T
ELEPHONE
IC
4