POEPHYTEREV-I National Semiconductor, POEPHYTEREV-I Datasheet - Page 13

• Manufacturer Part Number: POEPHYTEREV-I
• Description: BOARD EVAL LM5072, DP83848I
• Manufacturer: National Semiconductor
• Series: PHYTER®r

Specifications of POEPHYTEREV-I

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Outputs And Type: 1, Isolated
• Power - Output: 24W
• Voltage - Output: 3.3V
• Current - Output: 7.3A
• Voltage - Input: 39 ~ 57V
• Regulator Topology: Flyback
• Frequency - Switching: 250kHz
• Board Type: Fully Populated
• Utilized Ic / Part: DP83848, LM5072
• Lead Free Status / RoHS Status: Not applicable / Not applicable

AN_EN (LED_ACT/COL)
AN_1 (LED_SPEED)
AN_0 (LED_LINK)
MII_MODE (RX_DV)
SNI_MODE (TXD_3)
LED_CFG (CRS)
MDIX_EN (RX_ER)
Signal Name
S, O, PU
S, O, PD
S, O, PU
S, O, PU
Type
Pin #
26
27
28
39
40
41
6
Auto-Negotiation Enable: When high, this enables Auto-Negoti-
ation with the capability set by ANO and AN1 pins. When low, this
puts the part into Forced Mode with the capability set by AN0 and
AN1 pins.
AN0 / AN1: These input pins control the forced or advertised op-
erating mode of the DP83848I according to the following table.
The value on these pins is set by connecting the input pins to
GND (0) or V
NEVER be connected directly to GND or VCC.
The value set at this input is latched into the DP83848I at Hard-
ware-Reset.
The float/pull-down status of these pins are latched into the Basic
Mode Control Register and the Auto_Negotiation Advertisement
Register during Hardware-Reset.
The default is 111 since these pins have internal pull-ups.
MII MODE SELECT: This strapping option pair determines the
operating mode of the MAC Data Interface. Default operation (No
pull-ups) will enable normal MII Mode of operation. Strapping
MII_MODE high will cause the device to be in RMII or SNI mode
of operation, determined by the status of the SNI_MODE strap.
Since the pins include internal pull-downs, the default values are
0.
The following table details the configurations:
LED CONFIGURATION: This strapping option determines the
mode of operation of the LED pins. Default is Mode 1. Mode 1 and
Mode 2 can be controlled via the strap option. All modes are con-
figurable via register access.
SeeTable 3 for LED Mode Selection.
MDIX ENABLE: Default is to enable MDIX. This strapping option
disables Auto-MDIX. An external pull-down will disable Auto-
MDIX mode.
13
AN_EN AN1
AN_EN AN1
MII_MODE
0
0
0
0
1
1
1
1
CC
(1) through 2.2 k resistors. These pins should
0
1
1
0
0
1
1
0
0
1
1
SNI_MODE
Description
AN0
AN0
0
1
0
1
0
1
0
1
X
0
1
10BASE-T, Half-Duplex
10BASE-T, Full-Duplex
100BASE-TX, Half-Duplex
100BASE-TX, Full-Duplex
10BASE-T, Half/Full-Duplex
100BASE-TX, Half/Full-Duplex
10BASE-T Half-Duplex
100BASE-TX, Half-Duplex
10BASE-T, Half/Full-Duplex
100BASE-TX, Half/Full-Duplex
Advertised Mode
MII Mode
RMII Mode
10 Mb SNI Mode
Forced Mode
MAC Interface
Mode
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