DP83849I_15 Datasheet, PDF (87/98 Pages) Texas Instruments – DP83849I PHYTER DUAL Industrial Temperature With Flexible Port Switching Dual Port 10/100 Mb/s Ethernet Physical Layer Transceiver

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6 Applications, Implementation, and Layout
DP83849I
SNOSAX1F – MAY 2008 – REVISED SEPTEMBER 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
6.1 Application Information
The DP83849I is a dual port physical layer Ethernet transceiver. When using the device for Ethernet
application, it is necessary to meet certain requirements for normal operation of the device. The following
typical application and design requirements can be used for selecting appropriate component values for
DP83849.
6.2 Typical Application
MPU/CPU
MII/RMII/SNI
MII/RMII/SNI
Port B
DP83849I
Port A
25 MHz
Clock
Source
Status
LEDs
10BASE-T
or
100BASE-TX
10BASE-T
or
100BASE-TX
6.2.1 Design Requirements
For this design example, use the parameters listed in Table 6-1 as the input parameters.
PARAMETER
VIN
VOUT
Clock Input
Table 6-1. Design Parameters
EXAMPLE VALUE
3.3 V
VCC – 0.5 V
25 MHz for MII and 50 MHz for RMII
6.2.2 Detailed Design Procedure
6.2.2.1 TPI Network Circuit
Figure 6-1 shows the recommended circuit for a 10/100 Mb/s twisted pair interface.
Below is a partial list of recommended transformers. It is important that the user realize that variations with
PCB and component characteristics requires that the application be tested to ensure that the circuit meets
the requirements of the intended application.
• Pulse H1102
• Pulse H2019
• Belfuse S558-5999-U7
• Halo TG110-S050N2RL
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Applications, Implementation, and Layout
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