e-stlc3095 STMicroelectronics, e-stlc3095 Datasheet - Page 12

• Manufacturer Part Number: e-stlc3095
• Description: Integrated Pots Interface For Home Gateway And Wll
• Manufacturer: STMicroelectronics

Functional description
3.2
3.2.1
3.2.2
12/28
The 220mΩ typical value guarantees an average current consumption from Vpos < 800mA
for Fly-Back configuration
The self generated battery voltage is set to a predefined value in on-hook state.
This value can be adjusted via one external resistor (RF1) and it is typical -46V. When RING
mode is selected this value is increased to -64V typ.
Once the line goes in off-hook condition, the DC/DC converter automatically adjusts the
generated battery voltage in order to feed the line with a fixed DC current (programmable via
RLIM) optimizing the power dissipation.
Operating modes
Power down
When this mode is selected the SLIC is switched off and the TIP and RING pins are in high
impedance. Also the line detectors are disabled therefore the off-hook condition cannot be
detected. This mode can be selected in emergency condition when it is necessary to cut any
current delivered to the line. This mode is also forced by STLC3095 in case of thermal
overload (T
In this case the device goes back to the previous status as soon as the junction temperature
decreases under the hysteresis threshold.
No AC transmission is possible.
High impedance feeding (HI-Z)
This operating mode is normally selected when the telephone is in on-hook in order to
monitor the line status keeping the power consumption at the minimum.
The output voltage in on-hook condition is equal to the self generated battery voltage (-46V typ).
When off-hook occurs the DET becomes active (low logic level).
The off-hook threshold values in HI-Z mode is the same as the programmed value in
ACTIVE mode.
The DC characteristic in HI-Z mode is just equal to the self generated battery with
2x(1600Ω+Rp) in series (see
No AC transmission is possible.
Figure 3.
j
> 140°C).
DC characteristic in HI-Z mode.
2x(R1+Rp)
Figure 3
Vbat
IL
), where Rp is the external protection resistance.
Slope: 2x(R1+Rp)
(R1=1500ohm)
Vbat (-46V)
VL
STLC3095