NXP Semiconductors NTS0304EUK-ARD, User Manual, Page: 7 / 29

NXP Semiconductors
UM11762
NTS0304EUK-ARD evaluation board
From the Arduino interface, the SPI and I
2
C bus goes to the 4-bit level translator U7 (the
same IC as the DUT). The multiplexer U5 selects between the I
2
C-bus and “SCLK” /
“MOSI” lines of the SPI bus. From U7, the signal lines arrive to PORT A of U6 through
J8. After the level shift occurs, the signal lines go through J9 to level translators U8 and
U10 (PORT A). At the same time, the signals go to the external connector J3. The jumper
header J2 closes the daisy chain loop of the SPI bus.
PORT B of U8 / U10 goes to the SPI / I
2
C digital potentiometer U11. The lines also return
to the Arduino interface in a loopback configuration, allowing for bidirectional tests of
the DUT. The analog output of the digital potentiometer (“W” terminal) is buffered by the
voltage follower U9, and goes to J10 analog output connector, and to the analog input A0
of the Arduino interface.
The board contains two programmable LDO voltage regulators: LDO1 supplies the VCCA
of U7 and U6, and LDO2 supplies VCCB of U6 (the DUT), and VCCA of U8 / U10. The
interlock circuit disables both LDOs if the condition VCCA > VCCB occurs. For more
details regarding power configuration, see the NTS0304E datasheet.
Figure 2. NTS0304EUK-ARD block diagram
4.4 Schematic diagram
The schematic diagram of NTS0304EUK-ARD is available at URL: http://www.nxp.com/
NTS0304E-ARD .
4.5 Arduino port
J1, J4, J5, and J6 are the mated pin headers of Arduino Uno R3 connectors, having
the same electrical function and placed on the board, so that the daughterboard can be
directly inserted in the Arduino port. Table 1 shows the pin chart of connectors, and the
lines used in the circuit (see also the SPF-46655_B.pdf schematic file):
UM11762 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 27 May 2022
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