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Board Connectors and Components
2.1
Power Supply Input – VA, VIO
The EVM is powered by a launch pad through the 5 V pin and the 3.3 V pin. The single analog (VA)
supply is connected with 5 V pin while the digital input/output (VIO) supply is connected with 3.3 V pin.
Figure 2. 5 V and 3.3 V Power Supply
2.2
Reference Voltage – VREF
The reference pin VREF should be supplied by external voltage through the test point VREF-EXT while
pin 1 and pin 2 in the JVREF header should be shorted. Otherwise, the VREF pin should be connected
with the U3 (LM4120AIM5-4.1), a 4.096 V precision micro-power low dropout voltage reference when pin
2 and pin 3 in the JVREF header are shorted.
Figure 3. Reference Voltage VREF
7
SNOU130A – July 2014 – Revised February 2015
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