Quick Start
3
SLUUBQ7 – August 2017
Copyright © 2017, Texas Instruments Incorporated
TPS2388EVM-612: PoE PSE Evaluation Module for TPS2388
2.1.2
Local 3.3 V (Labeled 3.3V)
Local 3.3 V for local devices (labeled as 3.3V) 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 48 V, the TPS2388 requires 3.3 V for the digital circuitry and this is routed up to TPS2388EVM-
016 over the connector interface.
2.1.3
External 3.3 V (Labeled 3.3V_USB)
The TPS2388EVM-612 provides galvanic isolation between PoE power side and host side using digital
isolators (ISO7241CD). The host side power is provided either from J2 (from USB2ANY) or J5 (from
LaunchPad). The current consumption is 6-mA typical, and 12-mA maximum.
CAUTION
Do not use USB2ANY and LaunchPad simultaneously.
Table 1. TPS2388EVM-612 Voltage Rail Current Requirements
Voltage Rail
Typical (mA)
Maximum (mA)
3.3V_USB
2.5
3
3.3V
25
30
VPWR (Miscellaneous)
35
57
VPWR (8x Type 1 Output Ports)
2992
3142
VPWR (8x Type 2 Output Ports)
5160
5418
VPWR Total (8x Type 1 Ports)
3027
3202
VPWR Total (8x Type 2 Ports)
5195
5478
2.2
PoE Port Interfaces
Configure the TPS2388 device with the host in order to get operational. Control the TPS2388 device
through the GUI or an external MCU. The host must configure the TPS2388 and send power on command
after a valid PD is connected to the port.
2.2.1
Standard 30 W, IEEE802.3 at Type 2 Ports
Four standard ports are provided at J19, J20, J8, and J7 for two-pair ports 1, 2, 3, and 4, respectively. The
power furnished is according to alternative A with MDI-X polarity.
2.2.2
Nonstandard 60-W Ports
Two non-standard, four-pair ports (J21 and J9) are provided. J21 is four pair port 1 and J9 is four pair port
2. The power furnished is according to alternative A with MDI-X polarity and alternative B on a single port
connector. A PD which can process power on all of the Ethernet conductors (refer to
for 51-W High-Power Four-Pair PoE
) can power on and consume up to 60 W. A single PD can be
powered as well with proper operations (the Semi-Auto Mode reference code has the capability to power
on both single PD and dual PD). The Virtual Auto Mode reference code disables these high power ports
completely, since it is intended for use on IEEE802.3at compliant (2-pair) ports only.
2.3
I
2
C Interfaces
The EVM provides two I
2
C interfaces to the TPS2388.
2.3.1
USB2ANY
J2 provides an interface with the USB2ANY adapter when using a PC and GUI.
