Texas Instruments TPS23882B1EVM, User Manual, Page: 4 / 31

2.3.2 MSP-EXP430FR5969
J3, J4, and J5 of the motherboard provide an interface with the MSP-EXP430FR5969 when using a PC to
develop custom system software.
2.4 Basic Test Setup Using Autonomous Mode
The TPS23882B1 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 daughterboard. All ports are configured with the same power level. Due to
the hardware configuration on the motherboard, all 2-pair ports are interoperable with PDs. Only 2P-15W and
2P-30W are valid selections on the TPS23882B1EVM-008 as the other resistors are not populated.
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 2-1 illustrates the basic
setup using autonomous mode.
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
Figure 2-1. 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 2-2. AUTO Pin Programming
AUTO Pin
Autonomous Mode
Configuration
Resulting Register Configurations
Register 0x12h Register 0x14h Register 0x29h
Open/Floating Disabled 0x00h 0x00h 0x00h
124 kΩ 2-pair 15 W 0xFFh 0xFFh 0x00h
62 kΩ 2-pair 30 W 0xFFh 0xFFh 0x33h
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4 TPS23882B1EVM: PoE, PSE, TPS23882B1
Evaluation Module SLVUC36 – APRIL 2021
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