- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄2016 > SI2494-A-GM (Silicon Laboratories Inc)IC ISOMODEM 56KBPS 38-QFN PDF資料下載
參數(shù)資料
| 型號： | SI2494-A-GM |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 17/70頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ISOMODEM 56KBPS 38-QFN |
| 標準包裝： | 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頁第16頁當前第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
24
Rev. 1.0
Figure 9. Loop Current
4.17. Overcurrent Detection
The Si2494/39 includes an overcurrent detection feature that measures the loop current at a programmable time
after the Si2494/39 goes off-hook. This allows the Si2494/39 to detect if it is connected to an improper telephone
line. The overcurrent detection feature may be enabled by setting the OCDM bit (U70, bit 11). OHT (U77, bits 8:0)
sets the delay after off-hook until the loop current is measured. See “AN93: ISOmodem Chipset Family Designer's
Guide” for details.
4.18. Global Operation
The Si2494/39 chipset contains an integrated silicon direct access arrangement (Silicon DAA) that provides a
programmable line interface to meet international telephone line interface requirements. “AN93: Modem Designer’s
Guide” gives the DAA register settings required to meet international PTT standards.
Additionally, the user-access registers (via the AT:U and AT:R commands) may be programmed for country-specific
settings, such as dial tone, ring, ringback, and busy tone. See AN93 for complete details.
4.19. Firmware Upgrades
The Si2494/39 contains an on-chip program ROM that includes the firmware required for the features listed in this
data sheet. In addition, the Si2494/39 contains on-chip program RAM to accommodate minor changes to the ROM
firmware. This allows Silicon Labs to provide future firmware updates to optimize the characteristics of new modem
designs and those already deployed in the field. See AN93 for complete details.
4.20. DTMF Detection / Generation
The Si2494/39 provides comprehensive DTMF tone generation and detection. The ISOmodem can generate
single tones or DTMF tones using the +VTS command. DTMF tones may also be generated during dialing using
the “ATDT” command. DTMF detection is only available in voice mode (FCLASS = 8). DTMF digits are reported
from the modem to the host using <DLE> shielding.
0 3 6 9 12 15 18 21 24
30 33 36 39 42 45 48 51 54 57 60 63 66 69 72
140
75 78 81 84 87 90 93
Loop Current
(mA)
LVCS
BITS
27
Overload
0
5
10
15
20
25
30
CTR21 only
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SI3000-C-GS | IC VOICE CODEC 3.3V/5V 16SOIC |
| SI3011-F-FS | IC VOICE DAA GCI/PCM/SPI 16SOIC |
| SI3012-KS | IC LINE-SIDE DAA 16SOIC |
| SI3019-F-FS | IC LINE-SIDE DAA 16SOIC |
| SI3019-F-GM | IC VOICE GLOBAL DAA PROGR 20QFN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI2494-A-GMR | 制造商:Silicon Laboratories Inc 功能描述:56 KBPS, V.92 ISOMODEM +VOICE SYSTEM-SIDE - LEAD-FREE - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC ISOMODEM 56KBPS 38-QFN |
| SI24R1 | 制造商:SIRECTIFIER 制造商全稱:Sirectifier Semiconductors 功能描述:完全兼容 NRF24L01P,超低功耗高性能 2.4GHz GFSK 無線收發(fā)芯片 |
| SI24S | 制造商:IBase Technology (USA) Inc. 功能描述:(DS), ULTRA SLIM BOOK-SIZE EMBEDDED SYSTEM WITH W/ AMD K8 (B - Bulk |
| SI24SD | 制造商:IBase Technology (USA) Inc. 功能描述:(DS), ULTRA SLIM BOOK-SIZE EMBEDDED SYSTEM WITH W/ AMD ATHLO - Bulk |
| SI24XX-LOGTOOL | 功能描述:TOOL MODEM LOG SI24XX RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
發(fā)布緊急采購，3分鐘左右您將得到回復。