- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10906 > SI2439-A-GM (Silicon Laboratories Inc)IC ISOMODEM 33.6KBPS 38-QFN PDF資料下載
參數(shù)資料
| 型號： | SI2439-A-GM |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 16/70頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ISOMODEM 33.6KBPS 38-QFN |
| 標(biāo)準(zhǔn)包裝： | 364 |
| 系列： | * |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當(dāng)前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁
Si2494/39
Rev. 1.0
23
4.15. Caller ID Operation
The Si2494/39 supports full type I and type II caller ID detection and decode. Caller ID is supported for the US
Bellcore, European ETSI, UK, and Japanese protocols and is enabled via the +VCID, +VCDT, and +PCW
commands.
4.16. Parallel Phone Detection
The ISOmodem is able to detect when another telephone, modem, or other device is using the phone line. This
allows the host to avoid interrupting another phone call when the phone line is already in use and to intelligently
handle an interruption when the ISOmodem is using the phone line.
4.16.1. On-Hook Line-in-use Detection
When the ISOmodem is sharing the telephone line with other devices, it is important that it not interrupt a call in
progress. To detect whether another device is using the shared telephone line, the host can use the ISOmodem to
monitor the TIP-RING dc voltage with the line voltage sense (LVS) register (U6C, bits 15:8). The LVS bits have a
resolution of 1 V per bit with an accuracy of approximately ±10%. Bits 0 through 6 of this 8-bit signed twos
complement number indicate the value of the line voltage, and the sign bit (bit 7) indicates the polarity of TIP and
RING. The ISOmodem can also monitor the TIP-RING dc voltage using the LVCS register (U79, bits 4:0). See
Figure 8 on page 23. See also the %Vn commands for automatic line-in-use detection.
4.16.2. Off-Hook Intrusion Detection
When the ISOmodem is off-hook, an algorithm is implemented in the ISOmodem to automatically monitor the TIP-
RING loop current via the LVCS register. During the off-hook state, the LVCS register switches from representing
the TIP-RING voltage to representing the TIP-RING current. See Figure 9 on page 24. Upon detecting an intrusion,
the ISOmodem alerts the host of the condition via the INT pin.
Figure 8. Loop Voltage
0 3 6
9 121518 21 24 2830 333639 42454751 5457 6063666972
100
0
5
75 78 81 84 87
LVC S
BITS
Loop Voltage (V)
10
15
20
25
30
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PIC16LC72A-04/SS | IC MCU OTP 2KX14 A/D PWM 28SSOP |
| PIC16C72A/JW | IC MCU OTP 2KX14 A/D PWM 28CDIP |
| PIC16C65B/JW | IC MCU EPROM 4KX14 PWM 40CDIP |
| SI2439-A-FM | IC ISOMODEM 33.6KBPS 38-QFN |
| PIC16C62B/JW | IC MCU EPROM 2KX14 PWM 28CDIP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI2439-A-GMR | 制造商:Silicon Laboratories Inc 功能描述:33.6 KBPS ISOMODEM + VOICE - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC ISOMODEM 33.6KBPS 38-QFN |
| SI2456 | 制造商:SILABS 制造商全稱:SILABS 功能描述:V.90, V.34, V.32BIS ISOMODEM⑩ WITH INTEGRATED GLOBAL DAA |
| SI2456-FT | 制造商:Silicon Laboratories Inc 功能描述:MODEM CHIP CHIPSET ISOMODEM 56KBPS 24TSSOP - Rail/Tube |
| SI2456-FT/REV F | 制造商:Silicon Laboratories Inc 功能描述:NOT RECOMMENDED FOR NEW DESIGNS, SEE SI2457-FT - Rail/Tube |
| Si2456-FTR | 制造商:Silicon Laboratories Inc 功能描述:MODEM CHIP CHIPSET ISOMODEM 56KBPS 24TSSOP - Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。