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參數資料
| 型號： | LAN8700 |
| 廠商： | SMSC Corporation |
| 英文描述： | 【15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR TM in a Small Footprint |
| 中文描述： | 【15kV的ESD保護信息產業(yè)部/ RMII快速的HP Auto - MDIX功能和SMSC flexPWR商標以太網PHY在小尺寸 |
| 文件頁數： | 30/73頁 |
| 文件大?。?/td> | 457K |
| 代理商： | LAN8700 |
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±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR
TM
in a Small Footprint
Datasheet
Revision 1.0 (02-09-07)
30
SMSC LAN8700/LAN8700I
DATASHEET
The Auto-MDIX function can be disabled through an internal register.
4.9
Internal +1.8V Regulator Disable
Part of the SMSC flexPWR
TM
technology is the ability to disable the internal +1.8v regulator. This
further increases the power savings as a more efficient external switching regulator can provide the
necessary +1.8v to the internal PHY circuitry.
A 4.7uF low ESR and 0.1uF capacitor must always be added to VDD_CORE and placed close to the
PHY. This capacitance provides decoupling to the power supply noise and ensures stability of the
internal regulator.
4.9.1
Disable the Internal +1.8V Regulator
To disable the +1.8v internal regulator, a pullup strapping resistor (see
Table 4.3, “Boot Strapping
Configuration Resistors,” on page 32
) is attached from RXCLK/REGOFF to VDDIO. When both VDDIO
and VDDA are within specification, the PHY will sample the RXCLK/REGOFF pin to determine if the
internal regulator should turn on.
If the pin is pulled up to VDDIO and sampled above VIH, then the internal regulator is off, and the
system needs to supply +1.8v ± 10% to the VDD_CORE pin.
4.9.2
Enable the Internal +1.8V Regulator
By default the RXCLK/REGOFF pin is left floating to enable the internal +1.8V regulator. Leaving the
pin floating lets the internal pull-down resistor strap the regulator on.
During VDDIO and VDDA power-on, if the REFOFF pin is sampled below VIL, then the internal +1.8V
regulator will turn on and run from the VDD33 pin.
4.10
nINT/TX_ER/TXD4 Strapping
The nINT, TX_ER, and TXD4 functions share a common pin. There are two functional modes for this
pin, the TX_ER/TXD4 mode and nINT (interrupt) mode. The RXD3/nINTSEL pin is used to select one
of these two functional modes.
Figure 4.4 Direct Cable Connection vs. Cross-over Cable Connection.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LAN8700AEZG | 制造商:SMSC 功能描述: |
| LAN8700-AEZG | 功能描述:以太網 IC HIPERFRM ETHRNT PHY RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| LAN8700C-AEZG | 功能描述:以太網 IC IC w/HP Auto-MDIX Embedded Ethernet RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| LAN8700C-AEZG-AR2 | 制造商:Microchip Technology Inc 功能描述: 制造商:Microchip Technology Inc 功能描述:MII/RMII 10/100 ETHERNET TRANSCEIVER - Trays 制造商:Microchip Technology Inc 功能描述:TXRX ETHERNET 10/100 36-VQFN 制造商:Microchip Technology Inc 功能描述:Ethernet ICs MII/RMII 10/100 制造商:Microchip Technology Inc 功能描述:MII/RMII 10/100 Ethernet Transceiver, 36 VQFN 6x6x0.9 TRAY |
| LAN8700C-AEZG-TR | 功能描述:以太網 IC Hi Perform Ethernet PHY RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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