NXP Semiconductors NTS0304EUK-ARD User manual

UM11762
NTS0304EUK-ARD evaluation board
Rev. 1.0 — 27 May 2022 User manual
Document information
Information Content
Keywords NTS0304EUK, I2C-bus, level translator, bidirectional, auto direction sensing,
Arduino port, EVK
Abstract The NTS0304EUK-ARD evaluation board is a daughterboard equipped
with an Arduino port, designated for easy test and design of NTS0304E
IC, 4-bit dual supply translating transceiver, with open drain, and auto
direction sensing. The board is fully compliant with IMXRT1050 EVK,
LPCXpresso55S69 (LPC55S69-ECK) and i.MX 8M Mini LPDDR4 EVK
(8MMINILPD4-EVK, 8MMINID4-EVK), including GUI software control. The
board can be attached to any device equipped with an Arduino port.

NXP Semiconductors UM11762
NTS0304EUK-ARD evaluation board
Rev Date Description
v.1.0 20220527 Initial version
Revision history
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NTS0304EUK-ARD evaluation board
IMPORTANT NOTICE
For engineering development or evaluation purposes only
NXP provides the product under the following conditions:
This evaluation kit is for use of ENGINEERING DEVELOPMENT OR
EVALUATION PURPOSES ONLY. It is provided as a sample IC pre-
soldered to a printed-circuit board to make it easier to access inputs,
outputs and supply terminals. This evaluation board may be used with any
development system or other source of I/O signals by connecting it to the
host MCU computer board via off-the-shelf cables. This evaluation board
is not a Reference Design and is not intended to represent a final design
recommendation for any particular application. Final device in an application
heavily depends on proper printed-circuit board layout and heat sinking
design as well as attention to supply filtering, transient suppression, and I/O
signal quality.
The product provided may not be complete in terms of required design,
marketing, and or manufacturing related protective considerations, including
product safety measures typically found in the end device incorporating the
product. Due to the open construction of the product, it is the responsibility of
the user to take all appropriate precautions for electric discharge. In order to
minimize risks associated with the customers’ applications, adequate design
and operating safeguards must be provided by the customer to minimize
inherent or procedural hazards. For any safety concerns, contact NXP sales
and technical support services.
UM11762 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
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NTS0304EUK-ARD evaluation board
1 Introduction
This document describes the NTS0304EUK-ARD evaluation board. The evaluation
board is built around the NTS0304E, a 4-bit dual supply translating transceiver controlled
via the I2C-bus, produced by NXP Semiconductors. The evaluation board serves as
a daughterboard that can be connected through an Arduino port to various Arduino
compatible (including original Arduino Uno R3) EVK / motherboards with the purpose of
testing and measuring the characteristics of the NTS0304E Device Under Test (DUT).
The NTS0304EUK-ARD daughterboard allows the ability to test and measure the static
and dynamic characteristics of the DUT by accessing a digital potentiometer with SPI and
I2C interface. Alongside the digital potentiometer, the board contains a loopback circuit
allowing the user to test the bidirectional capabilities of the DUT IC.
The DUT is tested for different logic levels applied to both sides of the level translator, by
supplying the NTS0304E IC with two independent voltage programmable power supplies.
The power supplies are controlled by the motherboard (EVK) through the same Arduino
port. Power is delivered from the motherboard (EVK) through the Arduino port also.
Additionally, a Windows Graphical User Interface (GUI) is provided to facilitate the
evaluation of the daughterboard. The GUI is used with the following NXP evaluation
boards: IMXRT1050 EVK Board, LPCXpresso55S69 Development Board and i.MX 8M
Mini LPDDR4 EVK Board.
2 Finding kit resources and information on the NXP web site
NXP Semiconductors provides online resources for the evaluation board and its
supported device(s) on http://www.nxp.com.
The information page for NTS0304EUK-ARD evaluation board is at http://www.nxp.com/
NTS0304E-ARD . The information page provides overview information, documentation,
software and tools, parametrics, ordering information and a Getting Started tab.
The Getting Started tab provides quick-reference information applicable to using the
NTS0304EUK-ARD evaluation board, including the downloadable assets referenced in
this document.
2.1 Collaborate in the NXP community
The NXP community is for sharing ideas and tips, asking and answering technical
questions, and receiving input on just about any embedded design topic.
The NXP community is at http://community.nxp.com.
3 Getting ready
Working with the NTS0304EUK-ARD evaluation board requires the kit contents,
additional hardware, and a Windows PC workstation with installed software.
3.1 Kit contents
•Assembled and tested evaluation board in an antistatic bag
•Quick Start Guide
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3.2 Assumptions
Familiarity with the SPI and I2C bus is helpful but not required.
3.3 Static handling requirements
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Therefore care
should be taken during transport and handling. You must use a ground strap
or touch the PC case or other grounded source before unpacking or handling
the hardware.
3.4 Minimum system requirements
This evaluation board requires a Windows PC workstation. Meeting these minimum
specifications should produce great results when working with this evaluation board.
•Computer with Windows 10
•One USB port (either 3.0 or 2.0 or 1.1 compatible)
•One of three EVK boards (MIMXRT1050-EVK, LPC55S69-EVK, 8MMINILPD4-EVK)
along with the associated firmware / GUI software
•USB cable for power and data connection between PC and EVK board (if not included
in the EVK package)
4 Getting to know the hardware
4.1 NTS0304EUK-ARD features
•Equipped with SPI / I2C digital potentiometer for rapid test and measurements
•Equipped with programmable power supplies for logic level combination
•On-board SPI / I2C-bus connector for easy access from external
•On-board jumpers for signal isolation of the DUT
•Equipped with Arduino Uno R3 port for direct connection with Arduino devices
•Fully compliant with IMXRT1050 EVK board, including GUI (Windows 10)
•Fully compliant with LPCXpresso55S69 dev. board, including GUI (Windows 10)
•Compliant with i.MX Mini LPDDR4 EVK board, including GUI (Windows 10)
Note: For i.MX Mini LPDDR4 EVK Board it is necessary to use IMX8MMINI-IARD
interposer board between the EVK and NTS0304EUK-ARD daughterboard (see
IMX8MMINI-IARD User Manual).
4.2 Kit featured components
Figure 1 identifies the main components on the board. The main elements are called
out in the picture. The NTS0304E (U6) is placed in the center of the board. The jumper
headers for signal isolation (J8, and J9) are placed near the DUT.
The Arduino port connectors (J1, J4, J5, J6) are located on the bottom side of the board.
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NXP Semiconductors UM11762
NTS0304EUK-ARD evaluation board
Figure 1. The NTS0304EUK-ARD board picture, top view (up) and bottom view (down)
4.3 Block diagram
Figure 2 shows the block diagram of the NTS0304EUK-ARD daughterboard. The DUT
is the NTS0304E IC (U6). The signal lines of the 4-bit level translator (the DUT) are
connected to the circuit through the jumper headers J8 (PORT A), and J9 (PORT B). J7
controls the output enable input of U6.
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From the Arduino interface, the SPI and I2C bus goes to the 4-bit level translator U7 (the
same IC as the DUT). The multiplexer U5 selects between the I2C-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 / I2C 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):
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Ref Des # Arduino label NTS0304EUK-ARD net
1 NC Not used
2 IOREF Not used
3 RESET Not used
4 3.3V Power supply (3.3V)
5 5V Power supply (5V)
6 GND Power supply return
7 GND Power supply return
J6 (Power)
8 Vin Not used
1 A0 OP-AMP_OUT
2 A1 Not used
3 A2 MUX3_POT_SEL
4 A3 MUX3_NTS_S3
5 A4 / SDA I2C_3V3_SDA
J1 (analog, digital, I2C)
6 A5 / SCL I2C_3V3_SCL
1 D0 / RX MUX1_LDO1_S0
2 D1 / TX MUX1_LDO1_S1
3 D2 MUX2_LDO2_S0
4 D3 / PWM MUX2_LDO2_S1
5 D4 MUX_VCCA_En
6 D5 / PWM POT_IDLE
7 D6 / PWM CS0_AD0_D6
J5 (digital, UART, PWM)
8 D7 MISO_NC_D7
1 D8 MOSI_SDA_D8
2 D9 / PWM CLK_SCL_D9
3 D10 / SS / PWM SPI_CS0_D10
4 D11 / MOSI / PWM SPI_MOSI_D11
5 D12 / MISO SPI_MISO_D12
6 D13 / SCK SPI_CLK_D13
7 GND Power supply return
8 AREF Not used
9 A4 / SDA Not used
J4 (mixed)
10 A5 / SCL Not used
Table 1. Arduino connectors pin chart and usage
The circuit is supplied from Arduino port through J6 and J4. Pin 4 of J6 is a 3.3 V power
supply while pin 5 of J6 is a 5 V power supply. Pins 6 and 7 of J6, and pin 7 of J4
represents the power supply return (ground).
Figure 3 shows the Arduino connectors. See also the SPF-46655_B.pdf schematic file of
NTS0304EUK-ARD daughterboard.
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NXP Semiconductors UM11762
NTS0304EUK-ARD evaluation board
Figure 3. NTS0304EUK-ARD – Arduino connectors
4.6 Level translator
From the Arduino interface, the SPI and I2C-bus are connected to PORT B of the 4-bit
level translator U7. The are six total bus lines, therefore the SDA / SCL lines of the I2C-
bus are multiplexed with MOSI / SCLK of SPI bus. The signal switch is realized with
74HCT4053D (U5). PORT B of U7 is set to 3.3 V, the logic level of the Arduino interface.
From PORT A of U7, the signals go to PORT A of U6 (the DUT) through the jumper
header J8. PORT A of both level translators U6 and U7 are supplied from programmable
power supply “LDO1”. The output enable input of U6 is set with the jumper header J7.
The OE input of U7 is set HIGH (OE active).
After the level shift, the signal lines go from PORT B of the DUT to PORT A of the level
translators U8 and U10, through the jumper header J9. The jumper headers J8 and J9
isolate the pins of U6 from the circuit and can be used for direct access from external
to the IO lines of the DUT. PORT B of U6 along with the PORT A of U8 and U10 are
supplied from “LDO2”.
PORT B of level translators U8 and U10 is connected to digital potentiometer U11.
The lines also return to the Arduino interface (the IO lines D6 to D9), in a loopback
configuration. This allows the ability to test the bidirectional capability of the DUT.
Figure 4 depicts the entire path for signal lines.
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NTS0304EUK-ARD evaluation board
Figure 4. NTS0304EUK-ARD – Level translator
4.7 Digital potentiometer
The signal lines from PORT B of level translators U8 and U10 are connected to the digital
interface of U11 (Figure 5). The digital potentiometer AD5161 (U11) can be controlled
through both SPI and I2C-bus. The bus selection is realized from the input “DIS” (pin 8)
of U11, connected to input A2 of the Arduino port. The switch U12 disables the digital
potentiometer when the loopback circuit is used. U12 is controlled from the Arduino
interface (D5). The output (wiper, pin 10) of the digital potentiometer is buffered with
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