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PDF U3761MB-T Data sheet ( Hoja de datos )
| Número de pieza | U3761MB-T | |
| Descripción | Universal Telephone IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
Speech Circuit
• Adjustable DC Characteristic
• Symmetrical Input of Microphone Amplifier
• Receiving Amplifier for Dynamic or Piezo-electric Earpieces
• Automatic Line-loss Compensation
Dialer
• DTMF/Pulse Switchable
• Pulse Dialing 66/33 or 60/40 or DTMF Dialing Selectable by Pin
• Selectable Flashing Duration by Key Pad
• Pause Function
• Optical Indication of Temporary DTMF Mode
• Keytone for Pulse Dialing
• Last Number Redial up to 32 Digits
• Three by 17 Digits Direct (One-touch) Memory
• Ten by 17 Digits Indirect (Two-touch) Memory
• Notice Function up to 32 Digits
• Standard Low-cost Crystal 3.58 MHz or Ceramic Resonator
• Handset Mute (Privacy) with Optical Indication
• Additional Toggle Flipflop
• Internal Loop Interrupt Detection
Tone Ringer
• 2-tone Ringer
• Adjustable Volume
• RC Oscillator
• Adjustable Threshold
Benefits
• Low Number of External Components
• High Quality through One IC Solution
Electrostatic sensitive device.
Observe precautions for handling.
www.DataSheet4U.com
Universal
Telephone IC -
All Functions
Integrated
U3761MB-T
Description
Atmel’s low-voltage telephone circuit U3761MB-T performs all the speech and line
interface functions required in an electronic telephone set, a tone ringer, a pulse and
DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is
possible with reduced performance.
Rev. 4744A–CORD–09/03
1 page  
Pin Description
Pin Symbol Function
U3761MB-T
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Configuration
8 XT A built-in inverter provides oscillation with an inexpensive
9 XT 3.579545-MHz crystal or ceramic resonator
Output of DTMF
DTMF output frequency
Specified (Hz) Actual (Hz) Error (%)
R1 697 699
10
MFO
R2 770
R3 852
766
848
R4 941 940
C1 1209 1216
C2 1336 1332
C3 1477 1472
+0.28
-0.52
-0.47
-0.10
+0.57
-0.30
-0.34
During the temporary DTMF mode the output switches to
low
11 MFIND Reset by on hook condition
Maximum voltage at MFIND = 5.5 V
12 GND Ground
VDD
XT
VDD
PD
VDD
XT
VDD
PD
MFO
VDD
VDD
PD
MFIND
VDD
PD
MFIND
13 MIC 1 Inverting input of microphone amplifier
14 MIC 2 Non-inverting input of microphone amplifier
4744A–CORD–09/03
MIC1
MIC2
1V
50K
50K
1V
VI
PD
VI
PD
5
5 Page 
U3761MB-T
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Keyboard Operation
C1 C2 C3 C4
1 2 3 S M1 R1
456
M2 R2
^←
7
*/T
F1
Normal Dialing
Redialing
89A
0 # R/P
F2 F3
E
• S: Store function key
• A: Indirect repertory dialing function key (LN 0 to 9)
• R/P: Redial and pause function key
• N: Notice function
• */T: * function; pulse-to-tone function
• M1 to M3: One-touch memory
• F1, F2, F3: Flash keys
M3
N
^
R3
R4
OFF HOOK
, D1 D2 , ...,
Dn
1. D1, D2, ..., Dn will be dialed out.
2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits.
3. If redialing length oversteps 32 digits, the redialing function will be inhibited.
OFF HOOK , D1 , D2 , ..., Dn BUSY, Come ON HOOK ,OFF
HOOK , R/P
The R/P key can execute the redial function only as the first key-in after off-hook;
otherwise, it executes the pause function (3.6 s).
Keys stored in redial memory: 0 to 9, #, R/P, A, M1, M2, M3, N, * (only tone mode)
Characters F1, F2, F3, Earth, (* in pulse mode) can only be stored in Mn, Ln and N
memory.
Characters F1, F2, F3, Earth, (* in pulse mode) will not be dialled out from redial
memory; dialling out was stopped, when recognizing one of the above characters.
Example:
OFF/ HOOK, D1, D2, F1, D4, D5, S, S, M1
a) ON/OFF-HOOK, R/P
b) ON/OFF-HOOK, M1
only D1, D2 will be dialed out, then dialing out stops
D1, D2, F1, D4, D5 will be dialed out
Content of redial memory can be copied to Mn, Ln, N; but copying memory Mn, Ln, N to
itself or to another memory (except redial memory) will erase the destinated memory.
4744A–CORD–09/03
11
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| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet U3761MB-T.PDF ] | |
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