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STLC3080 bảng dữ liệu(PDF) 5 Page - STMicroelectronics |
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STLC3080 bảng dữ liệu(HTML) 5 Page - STMicroelectronics |
5 / 23 page Resistive Region is programmable by means of external resistor RDC, limiting current can be se- lected by RLIM resistor. Concerning AC characteristic the STLC3080 allows to set 2W termination impedance by means of one external scaled impedance that may be complex. Two to four wire conversion is provided by an exter- nal network. Such network can be avoided in case of application with COMBOII, in this case the two to four wire conversion is implemented inside the COMBOII by means of the programmable Hybal fil- ter. When in ACTIVE mode it is also possible to per- form battery reversal in soft mode (with program- mable transition time) without affecting the AC sig- nal transmission. Ringing When Ringing mode is selected the STLC3080 activates the ring relay injecting the ringing signal on the line. As the ring trip is detected the logic in- dicator DET is set low and the ringing is automat- ically disconnected without waiting for the card controller command (auto ring trip). DET remains latched Low untill the operative mode is modified. If required , the ringing relay drive signal RELR can be synchronised to a clock applied to CKRING input. This clock is derived from the ringing signal with proper time delay, according to the activation/de- activation time of the relay. RELR is activated on the low level of CKRING clock. The duty cycle of CKRING can be modified in order to activate the RELR when required: CKRING low must last 1 µs minimum. If the synchronisation is not required, CKRING in- put must be steadily kept Low. All the STLC3080 relay drivers are open drain with the source connected to the RGND pin. Each relay drivers integrates a protection structure that allows to avoid external kick - back diodes, using both 5V or 12V relays. The ring trip circuit and its behaviour is described in Appendix D. Ground Start. This mode is selected when the SLIC is adopted in a system using the Ground Start feature. In this mode the TIP termination is set in High Imped- ance (100k Ω) while the RING one is active and fixed at Vbat +4.8V. In the case of connection of RING termination to GND the sinked current is limited to 30mA. When RING is connected to GND both Off-Hook and Ground-Key detectors become active. Power dissipation in this mode with a -48V battery voltage is 100mW High Impedance Feeding. As Stand-By, this mode is set in On-Hook condi- tion, with further reduced power consumption. Higher power efficiency turns back a lower immu- nity of the Off-Hook detector to line common mode currents. The DC feeding shows a constant current charac- teristic (Ilim = 17mA) followed by a resistive range with an equivalent series resistance RFEED = 1600 Ω + 2Rp. Thermal protection circuit is still active, preventing the junction temperature, in case of fault condi- tion, to exceed 150 °C In High Impedance Feeding most of the circuit is switched off, only the circuit, dedicated to Off- Hook detection, is powered. This allows to reduce the total power consumption in On-hook to 30mW (typical). The Off-Hook detection threshold is not program- mable but defined at a fixed IDETHI = 8mA(max.) ILIM [20÷50mA] RFEED = RDC 5 +2RP RFEED =2RP VBAT VBAT -7.8V I V Figure b. STLC3080 DC Characteristic in Active Mode. 17mA RFEED = 1600Ω +2RP D98TL373 VBAT -0.8V I V Figure c. STLC3080 DC Characteristic in High Impedance Feeding STLC3080 5/23 |
Số phần tương tự - STLC3080 |
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Mô tả tương tự - STLC3080 |
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