mc34216adwf Freescale Semiconductor, Inc, mc34216adwf Datasheet - Page 17

• Manufacturer Part Number: mc34216adwf
• Description: Programmable Telephone Line Interface Circuit With Loudspeaker Amplifier
• Manufacturer: Freescale Semiconductor, Inc

the different country requirements. During startup, this will be
the first register which has to be programmed in order to have
a dc setting as soon as possible.
(make/brake ratio, inter–digit pause) by making the LD bit
high and low. Also, memory dialing or last number redial can
be done. During LD = 1, the MC34216A makes its output
LAO low for the line break and reduces its internal current
consumption. The current through the microphone can be
stopped also by making bit MicP low.
low. It effectively mutes both the signal from the handset
microphone as well as the signal coming from a
speakerphone circuit. During this microphone mute state, a
MOTOROLA ANALOG IC DEVICE DATA
The dc mask of the MC34216A can be programmed to fit
The pulse–dialing is timed by the microcontroller
The transmit path can be muted by making the MicM bit
MF3
MF3
MF3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MF2
MF2
MF2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
MF1
MF1
MF1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Figure 16. Register Description
MF0
MF0
MF0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
MC34216A
Low
MFC1 = 0, MFC0 = 1
941
941
941
941
852
852
852
852
770
770
770
770
697
697
697
697
DTMF–Pair (in Hz)
High
1633
1477
1336
1209
1633
1477
1336
1209
1633
1477
1336
1209
1633
1477
1336
1209
melody can be sent to the line (melody on hold). In order to
enable the idle tone function, the IT bit has to be made high.
The squelch function can be enabled by making the M th bit
low. The line AGC feature can be enabled by making the
GR bit low.
It effectively mutes both the signal from the line to the
handset earpiece as well as to the loudspeaker output.
During this mute state, a pilot tone melody can be sent to the
earpiece or loudspeaker. This is very useful during
pulse–dialing, programming of telephone numbers in
memories or during operation of an answering or fax
machine. In order to enable the pilot tone function, the PT bit
has to be made high. The gain of the earphone amplifier can
be increased by 6.0 dB by making the EA bit high.
The receive path can be muted by making the EM bit low.
Key
D
C
B
A
#
0
9
8
7
6
5
4
3
2
1
*
MFC1 = 1, MFC0 = 0
Single Tone
Single Tone
(in Hz)
(in Hz)
1047
1319
1661
1760
2093
440
494
523
554
587
622
659
698
784
880
988
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