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參數(shù)資料
| 型號： | SI2439-A-FM |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 14/70頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ISOMODEM 33.6KBPS 38-QFN |
| 標(biāo)準(zhǔn)包裝： | 364 |
| 系列： | * |
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Si2494/39
Rev. 1.0
21
4.8. Low-Power Modes
The Si2494/39 provides multiple low power modes. Using the S24 S-register, the Si2494/39 can be set to
automatically enter sleep mode after a pre-programmed time of inactivity with either the DTE or the remote
modem. The sleep mode is entered after (S24) seconds have passed since the last DTE activity, after the transmit
FIFO is empty, and after the last data are received from the remote modem.
Additionally, the Si2494/39 can be placed in wake-on-ring-mode using the command, AT&Z. In either mode, the
ISOmodem remains in the sleep state until one of the following occurs:
A 1-to-0 transition on TXD (UART mode).
A 1-to-0 transition on SS (SPI mode).
A 1-to-0 transition on CS (parallel mode).
An incoming ring is detected.
A parallel telephone is picked up.
Line polarity reversal
The Si2494/39 may also be placed in a complete powerdown mode. Once the Si2494/39 completely powers down,
it can only be powered back on via the RESET pin.
4.9. Data Compression
The modem can achieve DTE (host-to-ISOmodem) speeds greater than the maximum DCE (modem-to-modem)
speed through the use of a data compression protocol. The compression protocols available are the ITU-T V.44,
V.42bis, and MNP5 protocols. Data compression attempts to increase throughput by compressing the data before
actually sending it. Thus, the modem is able to transmit more data in a given period of time.
4.10. Error Correction
The Si2494/39 ISOmodem can employ error correction (reliable) protocols to ensure error-free delivery of
asynchronous data sent between the host and the remote end. The Si2494/39 supports V.42 and MNP2-4 error
correction protocols. V.42 (LAPM) is most commonly used and is enabled by default.
4.11. Wire Mode
Wire mode is used to communicate with standard non-error correcting modems. When optioned with \N3, the
Si2494/39 falls back to wire mode if it fails in an attempt to negotiate a V.42 link with the remote modem. Error
correction and data compression are not active in wire mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Si2439-A-FM18-EVB | 功能描述:網(wǎng)絡(luò)開發(fā)工具 38pin Si2439+ Si3018 ISOmodem Eval Board RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| SI2439-A-FMR | 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 |
| SI2439-A-GM | 功能描述:IC ISOMODEM 33.6KBPS 38-QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 調(diào)制解調(diào)器 - IC 和模塊 系列:* 標(biāo)準(zhǔn)包裝:25 系列:- 數(shù)據(jù)格式:V.21，V.22，V.23，V.29，V.32，V.34，V.90，V.92，Bell 103，Bell 212A 波特率:33.6k 電源電壓:3.3V 安裝類型:- 封裝/外殼:- 供應(yīng)商設(shè)備封裝:- 包裝:托盤 配用:591-1013-ND - KIT DEV SOCKETMODEM PARALLEL591-1009-ND - KIT DEV SRL SOCKETMODEM UNIVERSL 其它名稱:MT5656SMI-P-V-34.R2-SPMT5656SMI-P-V-34.R2-SP-NDQ4711574 |
| 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 |
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