Quick Start
3
SLVUBQ3 – August 2019
Copyright © 2019, Texas Instruments Incorporated
TPS23882EVM: PoE, PSE, TPS23882 Evaluation Module
The minimum PSE port voltage is 44 VDC for type 1 and 50 V for type 2 and type 3. During evaluation,
choose the appropriate DC power supply for different environments.
2.1.2
Local 3.3 V (Labeled 3.3 V)
Local 3.3 V for local devices (labeled as 3.3 V) is provided by the onboard LM5019 buck converter. The
LM5019 provides a basic power-on sequence and provides a well-controlled and consistent startup. In
addition to 54 V, the TPS23882 requires 3.3 V for the digital circuitry and this is routed up to
TPS23882EVM-008 over the connector interface. The current consumption is 6-mA typical and 12-mA
maximum.
2.1.3
External 3.3 V (Labeled 3.3 V_USB)
The BOOST-PSEMTHR8-097 provides galvanic isolation between the PoE power side and host side
using digital isolators (ISO7241CD). The host side power is provided either from J2 of the mother board
(from
) or J5 of the mother board (from
CAUTION
Do not use USB2ANY and LaunchPad simultaneously.
Table 1. TPS23882 Voltage Rail Current Requirements
Voltage Rail
Typical (mA)
Maximum (mA)
3.3 V_USB
2.5
3
3.3 V
6
12
VPWR (Miscellaneous)
35
57
VPWR (8 × 2 Pair Ports)
4800
5455
VPWR Total (8 × 2 Pair Ports)
4835
5512
2.2
PoE Port Interfaces
The TPS23882 device must be configured through the host to become operational. This EVM provides 2
ways to control the TPS23882: TPS238x EVM GUI (with
) and Basic Reference Code (with
LaunchPad).
2.2.1
IEEE802.3bt 2-Pair Ports
Eight 2-pair ports are provided at J19, J20, J8, J7, J32, J33, J21, and J9 of the mother board for 2-pair
ports 1, 2, 3, 4, 5, 6, 7, and 8 respectively. The power furnished is according to alternative A with MDI-X
polarity.
2.3
I
2
C Interfaces
Two I
2
C interfaces to the TPS23882 are provided on the EVM.
2.3.1
USB2ANY
J2 of the mother board provides an interface with the
adapter when using a PC and GUI.
2.3.2
MSP-EXP430FR5969
J3, J4, and J5 of the mother board provide an interface with the
when using a PC to
develop custom system software.
