Texas Instruments BOOST-PSEMTHR-007, User Manual, Page: 17 / 38

Initialize
MSP430
Set Power Off to all ports.
Set Ports to SEMI_AUTO mode
Configure Interrupts, Remapping,
OSS,etc.
Start
Every 10 seconds
Print input voltage, temp, and port
telemetry via UART
Disconnection Event
Get Disconnect
Status
Determine port(s)
Classification Event
Get Classification
Status
Determine port(s)
Power On Port/
PPM
Classification Valid?
Print Status
Fault Event
Get Fault Status
Determine port(s)
Print Status
(QDEOH 3RUWV¶ GHWHFWLRQ &
classification
Load SRAM Code
Yes
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EVM Schematic, Layout Guidelines, PCB Assembly and Layer Plots
17 SLVUBP0A – May 2019 – Revised August 2019
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TPS23881EVM: PoE, PSE, TPS23881 Evaluation Module
5.4.3 Semi Auto Mode
Operation, the semi auto mode reference code is interrupt based. When MSP430 receives an interrupt
from the INT pin of the PSE, the code checks interrupt the register and event registers to proceed with
actions accordingly. The flowchart of semi auto mode code is shown in
Figure 11 .
Figure 11. Semi Auto Mode System Software Structure
6 EVM Schematic, Layout Guidelines, PCB Assembly and Layer Plots
This section contains the TPS23881EVM schematic, layout guidelines, printed-circuit board (PCB)
assembly and layer plots.
6.1 Schematic
Figure 12 through Figure 14 illustrate the TPS23881EVM (daughter card+motherboard) schematics.