Texas Instruments BOOST-PSEMTHR8-097, User Manual

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TPS237 3-4EVM-758
Class 3-4
Power
Sup ply
J
7
J
1
3
2
J
3
3
TPS238 82EVM-008
(+
)
(
±
)
J
8
J
2
0
J
1
9
D
1
J
2
BOO ST-PSE MTHR-097
J
2
1
J
9
Positive Negative
Etherne t
Cable
Quick Start
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4 SLVUBQ3 – August 2019
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TPS23882EVM: PoE, PSE, TPS23882 Evaluation Module
2.4 Basic Test Setup Using Autonomous Mode
The TPS23882 supports autonomous mode which means it can operate without any host control. During
power up the resistance on the AUTO pin is measured and the device is pre-configured according to the
jumper configuration on J5 of the daughter board. All ports are configured with the same power level. Due
to the hardware configuration on the mother board, all 2-pair ports are interoperable with PDs. Only 2P-
15W and 2P-30W are valid selections on the TPS23882EVM-008 as the other resistors are not populated.
In order to test with autonomous mode, install a jumper on the pins of J5 corresponding to the desired
power level and power on the board without the
USB2ANY or MSP-EXP430FR5969 connected. Figure 1
illustrates the basic setup using autonomous mode.
Figure 1. Basic Setup Using Autonomous Mode
If the EVM is powered with a jumper on J5 of the daughterboard, the device will automatically enter
autonomous mode at the selected power level. If the selected power level changes, the EVM must be
power cycled for the change to take effect.
Table 2. AUTO Pin Programming
AUTO Pin
Autonomous Mode
Configuration
Resulting Register Configurations
Register 0x12h Register 0x14h Register 0x29h
Open/Floating Disabled 0x00h 0x00h 0x00h
124 k Ω 2-pair 15 W 0xFFh 0xFFh 0x00h
62 k Ω 2-pair 30 W 0xFFh 0xFFh 0x33h