Texas Instruments Hercules TMS570LS31x, Руководство пользователя

Страница: 8 / 26

Power Supply
www.ti.com
8 SPNU509C – September 2011 – Revised November 2018
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Introduction
1.8 Power Supply
The HDK board operates from a 12 V external power supply connected to the main power input
(P1), a 2.5 mm, barrel-type plug. Internally, the +12 V input is converted into +1.2 V, +3.3 V and +5.0 V
using Texas Instruments swift voltage regulators and PTH power module. The +1.2 V supply is used for
the MCU core while the +3.3 V supply is used for the MCU's I/O buffers and other module on the board.
The +5.0 V supply is used for ADC power (second option) and USB VBUS.
There are multiple power test points on the HDK board. The three main test point pairs provide a
convenient mechanism to check the HDK’s current for each supply.
Table 1-2 shows the voltages for each
test point and what the supply is used for.
Table 1-2. Power Test Points
Test Point Pair Voltage Voltage Use
TP14 and TP15 1.2 V MCU core
TP16 and TP17 3.3 V MCU IO and logic
TP18 and TP19 1.2 V MCU PLL
TP20 and TP21 3.3 V MCU Flash pump
TP22 and TP23 3.3 V or 5.0 V
(J8 to enable 5 V)
MCU MibADC, and ADREFHI