參數(shù)資料
型號(hào)： LAN8187-JT
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 微控制器/微處理器
英文描述： High-Performance MII and RMII 10/100 Ethernet PHY with HP Auto-MDIX
中文描述： 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, TQFP-64
文件頁(yè)數(shù)： 30/66頁(yè)
文件大?。?/td> 545K
代理商： LAN8187-JT
High-Performance MII and RMII 10/100 Ethernet PHY with HP Auto-MDIX
Datasheet
Revision 0.6 (02-24-06)
30
SMSC LAN8187/LAN8187I
DATASHEET
4.9
Internal +1.8V Regulator Disable
Part of the LAN8187/LAN8187I 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.
4.9.1
Disable the Internal +1.8V Regulator
To disable the +1.8v internal regulator, a pulldown strapping resistor (see
Table 4.3, “Boot Strapping
Configuration Resistors,” on page 32
) is attached from REG_EN to VDDIO. When a reset event occurs,
the PHY will sample the REG_EN pin to determine if the internal regulator should turn on. If the pin
is grounded to VSS, then the internal regulator is off, and the system needs to supply +1.8v +/- 10%
to the VDD_CORE pin.
A 4.7uF low ESR and 0.1uF capacitor must be added to VDD_CORE and placed close to the PHY.
This capacitance provides decoupling of the external power supply noise and ensures stability of the
internal regulator.
4.9.2
Enable the Internal +1.8V Regulator
To enable the internal regulator, a pull-up resistor (see
Table 4.3, “Boot Strapping Configuration
Resistors,” on page 32
) to VDDIO needs to be added to the REG_EN pin.
A 4.7uF low ESR and 0.1uF capacitor must be added to VDD_CORE and placed close to the PHY.
This capacitance provides decoupling of the external power supply noise and ensures stability of the
internal regulator.
Note:
For VDDIO operation below +2.5V, SMSC recommends designs add external strapping
resistors in addition the internal strapping resistors to ensure proper strapped operation.
4.10
(TX_ER/TXD4)/nINT Strapping
The TX_ER, TXD4 and nINT functions share a common pin. There are two functional modes for this
pin, the TX_ER/TXD4 mode and nINT (interrupt) mode. The RXD3 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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