U3761MB Datasheet, PDF (15/23 Pages) TEMIC Semiconductors – Low Voltage Standard Telephone Circuit with 13 Memories

U3761MB
: Pulse-to-Tone ( /T)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{OFF HOOK}
, D1 , D2 , ..., Dn
: ,
/T , D1’ , D2’ , ...,
Dn’
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{1. If the mode switch is set to pulse mode, then the output signal will be:}
D1, D2, ..., Dn, Pause (3.6 s), D1’, D2’ ,..., Dn’
(Pulse)
(Tone)
2. If the mode switch is set to tone mode, then the output signal will be:
D1, D2, ..., Dn, * , D1’, D2’, ..., Dn’
(Tone)
(Tone)
(Tone)
3. The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse mode
only by going on-hook.
HKS
KEY IN
DP
T/P MUTE
MASK
2
*/T
t_KID
B
M
t_IDP
t_PDP
3
t_P
DTMF
OSC
Oscillation
13409
Figure 9. Pulse-to-tone operation
Earth
The Earth pin will go high 400 ms and the pause time of 1 s will be added when the Earth key is pressed. It can be stored
as a digit in Memory and has not the first priority.
TELEFUNKEN Semiconductors
Rev. A2, 23-Apr-97
Preliminary Information
15 (23)