STLC3075(2005) Ver la hoja de datos (PDF) - STMicroelectronics
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STLC3075 Datasheet PDF : 26 Pages
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STLC3075
2 DESCRIPTION (continued)
The battery level is properly adjusted depending on the operating mode. A useful characteristic for these
applications is the integrated ringing generator.
The control interface is a parallel type with open drain output and 3.3V logic levels.
The metering pulses are generated on chip starting from two logic signals (0, 3.3V) one define the meter-
ing pulse frequency and the other the metering pulse duration. An on chip circuit then provides the proper
shaping and filtering. Metering pulse amplitude and shaping (rising and decay time) can be programmed
by external components.
A dedicated cancellation circuit avoid possible CODEC input saturation due to Metering pulse echo.
Constant current feed can be set from 20mA to 40mA. Off-hook detection threshold is programmable from
5mA to 9mA.
The device, developed in BCDIIIS technology (90V process), operates in the extended temperature range
and integrates a thermal protection that sets the device in power down when Tj exceeds 140°C.
Figure 3. Pin Connection
D0
D1
D2
PD
GAIN SET
N.C.
DET
CKTTX
CTTX1
CTTX2
RTTX
44 43 42 41 40 39 38 37 36 35 34
1
33
2
32
3
31
4
30
5
29
6
28
7
27
8
26
9
25
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
ILTF
RD
RTH
IREF
RLIM
AGND
CVCC
VPOS
RSENSE
GATE
CLK
D00TL488
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Value
Vpos
Positive Supply Voltage
A/BGND AGND to BGND
-0.4 to +13
-1 to +1
Vdig
Tj
Vbtot (1)
Pin D0, D1, D2, DET, CKTTX
Max. junction Temperature
Vbtot=|Vpos|+|Vbat|. (Total voltage applied to the device supply
pins).
-0.4 to 5.5
150
90
ESD Human Body Model
RATING Charged Device Model
±1750
±500
(1) Vbat is self generated by the on chip DC/DC converter and can be programmed via RF1 and RF2.
RF1 and RF2 shall be selected in order to fulfil the a.m limits (see External Components Table page 10)
2/26
Unit
V
V
V
°C
V
V
V
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