Texas Instruments Hercules TMS570LS31, User Manual

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TMS570LS31 HDK User Guide
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Texas Instruments Proprietary Information – Internal Data
1.8 Power Supply
The HDK board operates from a 12V external power supply connected to
the main power input (P1), a 2.5 mm, barrel-type plug. Internally, the +12V input
is converted into +1.2V, +3.3V and +5.0V using Texas Instruments swift voltage
regulators and PTH power module. The +1.2V supply is used for the MCU core
while the +3.3V supply is used for the MCU's I/O buffers and other module on the
board. The +5.0 volt supply is used for ADC power (2
nd
option).
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. The table below shows the voltages for each test point and what the
supply is used for.
Table 2, Power Test Points
Test Point Pair
Voltage Voltage Use
TP14 and TP15 1.2V MCU core
TP16 and TP17 3.3V MCU IO and logic
TP18 and TP19 1.2V MCU PLL
TP20 and TP21 3.3V MCU Flash pump
TP22 and TP23 3.3V or 5.0V (J8 to
enable 5V) MCU MibADC, and
ADREFHI