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NXP Semiconductors
UM11762
NTS0304EUK-ARD evaluation board
Figure 7. NTS0304EUK-ARD – LDO section
4.9.1 LDO1
The programmable power supply LDO1 consists of an adjustable voltage regulator
LDK120M (U3) and the analog switch 74HCT4052D (U1). The analog switch selects the
resistor divider ratio in the feedback loop of the voltage regulator (U3).
the output voltages of LDO1 as a function of switch position. U1 is controlled from the
Arduino port through “MUX1_LDO1_S0”, “MUX1_LDO1_S1”, “MUX1_EN_B” (pins 1, 2,
and 5 of Arduino connector J5). The VCC_LDOOUT1 rail feeds the VCCA power pins of
U6 (the DUT) and U7 level translators.
MUX1_EN_B
MUX1_LDO1_S1
MUX1_LDO1_S0
VCC_LDOOUT1
High
X (don’t care)
X (don’t care)
0.95 V
Low
Low
Low
1.2 V
Low
Low
High
1.8 V
Low
High
Low
2.5 V
Low
High
High
3.3 V
Table 2. VCC_LDOOUT1 voltages
UM11762
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© NXP B.V. 2022. All rights reserved.
User manual
Rev. 1.0 — 27 May 2022
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