Texas Instruments TS3A227E, Руководство пользователя, Страница: 5 / 30

VDD input range is 2.5 V to 4.5 V
VDDIO can be separate supply for GPIO pins
VDDIO input range is 1.8 V to VDD
J3 is used to select between a separate VDDIO voltage and
the MSP430 supply being used to power the board
VCC
GND
VCC
J1 VCC
VCC VDD
VCC is the MSP430 supply to the board.
J_VDD can be used to connect the MSP430 supply to the TS3A227E
VDDIO
Blue
D1
1.50k
R1
1
2
3
J3
1 2
J2
J5
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TS3A227E-EVM Connections Overview
4.2 Power
The TS3A227E-EVM derives its power from the LaunchPad. The EVM board power is labeled VCC in the
schematic and the power supplied to the TS3A227E is labeled VDD. Header connection explanations
follow:
• Header J1 provides a point to check VCC or to provide the board power if the LaunchPad is not being
used.
• Header J2 provides a means to power the TS3A227E from the board power. Populate this jumper to
connect VDD to VCC. If external power is being applied to the TS3A227E, remove this jumper.
• The blue diode D1 lights up when board power is applied.
• J3 selects the digital IO pull-up voltage. By shorting pins 1 and 2, the digital IO lines are pulled up to
the board supply voltage. Shorting pins 2 and 3 allows an external pull-up voltage to be used (such as
1.8 V) from J5.
• J5 provides a connection for supplying an external IO voltage.
Figure 3. Power Connections
5 SLVUAD9 – December 2014 TS3A227E EVM User's Guide
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