參數(shù)資料
型號(hào)： MC34216ADWF
廠商： MOTOROLA INC
元件分類： 無繩電話/電話
英文描述： PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER
中文描述： TELEPHONE MULTIFUNCTION CKT, PDSO28
封裝： PLASTIC, SO-28
文件頁(yè)數(shù)： 10/20頁(yè)
文件大小： 527K
代理商： MC34216ADWF
MC34216A
10
MOTOROLA ANALOG IC DEVICE DATA
Z21
T3
T2
Z1
C12
RX
Z0
R5
V
C7
2V
1.4 V
V
Line +
HYN
LAI
SAO
NDC
SAI
LAO
Line –
Gnd
I2
R1
MC34216A
C16
2.4 V
IMP
CM
G
CC
O2
BE
VO1
+
+
+
+
+
+
≈
+
+
Figure 4. DC Part of the Block Diagram of the MC34216A
The transfer from Region 2 to 3 occurs at the point VLK,
ILK, which is calculated:
VLK
Z1 x I2CD
2VBE
VCD
VO2
ILK
Z21
Z0
x Z1 x I2CD
2VBE
VCD
R1
With : I2CD
I2C
I2D
2
, and VCD
VC
VD
2
,
and 2VBE
1.4 V, VO2
1.1 V
When the French or U.K. mask is selected, this transfer
takes place for line currents of 30 mA to 40 mA depending
on the components settings. With the Startup and Low
Voltage mask, the transfer lies outside the normal operating
range with line currents of 90 mA or more. In most
applications, the transfer from Region 1 to 2 takes place for
line currents below 10 mA.
With proper settings, Region 4 is only entered during an
overload condition. In this mode, the power consumption in
the telephone set is limited. In order to detect an overload
condition, the voltage between the Pins LAI and SAO is
monitored. When the voltage difference is larger than the
threshold Vclamp1, the protection is made active. The relation
for the line voltage VLP at this point is given as:
Z0
VLP
VCD
VO2
When the protection mode is entered, the line current is
reduced to a lower value ILP of:
ILP
Vclamp2
VO1– VO2
R1
When the line voltage becomes smaller than VLP, the
overload condition is gone and the MC34216A will leave
Region 4.
The current drawn from the line by the dc part is used to
supply the MC34216A and peripheral circuits. The surplus of
current is sunk away by the voltage stabilizer at Pin VCC
where a reservoir capacitor is connected. The reference for
the circuit is Pin Gnd.
Startup of the application is ensured by an internal startup
circuit. During the startup, the internal registers of the
MC34216A are reset, and the reset Pin RS goes high. This
signals is meant to indicate to the microcontroller that the
programming of the MC34216A can start.
When the line current flows, the hook status output
Pin D/HS goes high. This serves as the information for the
microcontroller that the set is off–hook. When the line current
is no longer present, the pin goes low again. Because the line
current is monitored, and not the line voltage, an interrupt of
the exchange can be recognized.
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