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參數(shù)資料
| 型號(hào)： | STLC30R80 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | INTEGRATED RINGING SLIC FOR SHORT LOOP APPLICATIONS |
| 中文描述： | 綜合振鈴用戶接口短環(huán)路應(yīng)用 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 172K |
| 代理商： | STLC30R80 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)
APPENDIX A
Battery voltage autoset
The STLC30R80 shows a line voltage depending on the voltage applied to Vbat pin. In particular in the
On-Hook the line voltage is Vbat if the SLIC is put in HI-Z mode or Vbat -7.8V if the SLIC is put in Active
mode.
If the battery voltage applied to the Vbat pin is always -70V (necessary to generate the proper ringing
signal), during the On-Hook the line voltage is higher than 60V.
A simple circuit to generate the proper Off-Hook battery voltage can be used starting from the -70V as
shown in the below figure A1.
The RING command (active low) is used to switch on the NPN transistor and apply the battery voltage
directly to the Vbat pin. When the RING command is high the NPN transistor is off and the zener diode
reduces the voltage applied to the Vbat pin.
STLC30R80
V
BAT
24V
BATTERY VOLTAGE (-70V)
D00TL461
BC558
BC556
RING
VCC
470K
47K
470K
68K
Figure A1.
STLC30R80
11/13
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