Figure 4-6. USB Micro-B Receptacle (J6) Schematic
4.1.7 TP8 (5V), J10 (3.3V), TP7 (SYS_PWR)
Use the TP8, and J10 test points to measure the output voltage of the onboard DC/DC converters. These
DC/DC converters produce the required voltage rails for full functionality of the EVM including power delivery,
powering internal and external circuits, and so forth. These test points allow the user to verify the system
supplies on the TPS65994EVM. LDO_1V5 is internally generated for internal circuitry. Use P3V3 to supply
VIN_3V3 which then supplies LDO_3V3. Also, use LDO_3V3 as a low power output for external flash memory.
In bus-powered conditions, or self-powered conditions, LDO_3V3 is active. TP7 test point is provided to verify
input voltage of barrel jack connector.
4.1.8 Aardvark Connector (J9)
This connector matches the Total Phase® Aardvark that allows the user to access the I2C pins on the
TPS65994EVM using the I2C Master capabilities. U6 is used to swap between I2C1 or I2C3 connected to the
aardvark connector. S3 is used to control which way the 2 to 1 MUX will be set. If S3 is disabled, by default, I2C1
would be connected to the Aardvark header. When S3 is enabled, I2C3 would be connected to the Aardvark
header.
Figure 4-7. Aardvark Connector (J9) Schematic
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Setup
SLVUBM1C – JANUARY 2019 – REVISED JANUARY 2021
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TPS65994 EVM User Guide 7
Copyright © 2021 Texas Instruments Incorporated
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