U3760MB Datasheet, PDF (11/19 Pages) TEMIC Semiconductors – Low-Voltage Standard Telephone Circuit

U3760MB
: 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
MUTE
KT
*/T
4
2
8
t_KID
t_PDP
t_IDP
t_B
t_IDP
t_M
t_P
10630
MFO
OSC
Oscillation
Figure 6. Pulse-to-tone operation
Rev. A3, 19-Feb-98
11 (19)