U4070B-FP TEMIC Semiconductors, U4070B-FP Datasheet - Page 2

• Manufacturer Part Number: U4070B-FP
• Description: Tone Ringer Interface
• Manufacturer: TEMIC Semiconductors

Pin Configuration
Pin Description
Power supply a and b , Pin 1, 14
An ac ringing voltage is supplied to the inputs a and b
U4074B
2 (6)
(13, 14)
(10, 11)
10 (12)
13 (15)
(1,16)
11, 12
(6, 7)
(2, 8)
2 (3)
3 (4)
4 (5)
7 (9)
1, 14
8, 9
Pin
5, 6
V B
NC
NC
TH
A1
A0
a
2f
Symbol
A1, A0
O
GND
a , b
V
V
Mel
NC
V
TH
1
1
2
3
4
5
6
7
8
2f
, O
DC
DD
B
2
AC ringing signal input
Output to charging capacitor
Comparator threshold adjust-
ment input
Output for frequency detection
Digital volume adjustment in-
put
Input for melody signal
DC supply diode connections
Microcomputer supply voltage
Outputs to the transducer
Ground
Not connected
94 7904 e
16
15
14
13
12
11
10
9
Function
Preliminary Information
GND
O2
O1
V
V
V
Mel
b
DD
DC
DC
via a 0.8
a 2.2 k . resistor
3. The circuit possesses the following overload resis-
4. Testing the circuit with the configuration shown in
Charging voltage of surge capacitance: V
Pulse shape: 10/700
Pulse sequence: 30 s
Number of surges: 10
Polarity change after 5 surges
See figure 2.
Smoothing Capacitors, Pin 2, 10
After rectification of the ac ringing voltage via the
integrated rectifier bridge, the pulsating DC voltage is
smoothed by the external capacitor ( 22
Pin 2 ( 3 ). The charging voltage is restricted to a
maximum of 30 V by an integrated Z-diode. A 47
external capacitor of will smooth the regulated supply,
V
DD
tance at terminals a and b.The circuit can withstand
a voltage of 110 V with a frequency of 50 Hz at
terminals a and b for a maximum of 15 s.
figure 2 does not destroy the circuit under the
following conditions.
, at pin 10 (12 ).
m
Mel
V
F decoupling capacitor connected in series with
TH
A1
A0
a
B
2f
6
7
1
4
5
2
3
m
s
TELEFUNKEN Semiconductors
94 7903 e
Rev. A1, 06-May-96
14
13
12
11
10
9
8
m
cs
F to 47
= 2 kV
GND
O2
O1
V DD
V DC
V
b
DC
m
F ) at
m
F