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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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.
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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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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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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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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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the operational amplifier U9. The buffer output is available at analog out connector J10.
Through the MUX U5, the analog out goes to input A0 of the Arduino interface.
Figure 5. NTS0304EUK-ARD – Digital potentiometer
4.8 SPI / I2C external connector
The SPI / I2C-bus lines can be accessed externally through connector J3. Figure 6 shows
the SPI / I2C – EXTERNAL connector. J3 is connected to the bus in the section between
the jumper header J9 and PORT A of level translators U8 and U10. J2 closes the daisy
chain path for the SPI bus.
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Figure 6. NTS0304EUK-ARD – SPI / I2C-bus external connector
4.9 Programmable power supplies LDO1 and LDO2
NTS0304EUK-ARD contains two programmable power supplies: LDO1 and LDO2.
Figure 7 depicts the LDO section of the schematic diagram. LDO1 provides the power
for VCC_LDOUT1, and LDO2 supplies VCC_LDOUT2 power rail. Both regulators are
controlled from the EVK through the Arduino port.
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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). Table 2 shows
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
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4.9.2 LDO2
The programmable power supply LDO2 is realized with the adjustable voltage regulator
MIC5301 (U4), and the analog switch 74HCT4052D (U2). Similarly, the analog switch
selects the resistor divider ratio in the feedback loop of the voltage regulator (U4). Table 3
shows the output voltages of LDO2 as a function of the switch position. U1 is controlled
from the Arduino port through “MUX2_LDO2_S0” and “MUX2_LDO2_S1”, (pins 3 and 4
of Arduino connector J5). The control line “MUX2_EN_B” is connected to ground through
pull-down resistor R18. The VCC_LDOOUT2 rail feeds the VCCB power pin of U6 (the
DUT) and the VCCB pins of U8 and U10 level translators.
MUX2_LDO2_S1 MUX2_LDO2_S0 VCC_LDOOUT2
Low Low 1.8 V
Low High 2.5 V
High Low 3.3 V
High High 4.96 V
Table 3. VCC_LDOOUT2 voltages
4.9.3 The interlock
To ensure proper operation, the NTS0304E needs to comply with the following condition:
VCCA ≤ VCCB. An interlock circuit was implemented to avoid the above described
condition. The components involved in the interlock circuit are U1, U2, D3, and D4. The
voltage level applied to the enable inputs of the LDOs (U3, and U4) depends on the
voltage selection performed by the switches U1 and U2. Therefore, the LDOs are ON
only if the condition VCC_LDOUT1 ≤ VCC_LDOUT2 occurs. Table 4 shows the enable
status of the LDOs, as a function of the selected output voltages.
VCC_LDOUT2
VCC_LDOUT1 1.8 V 2.5 V 3.3 V 4.96 V
0.95 V ON ON ON ON
1.2 V ON ON ON ON
1.8 V ON ON ON ON
2.5 V OFF ON ON ON
3.3 V OFF OFF ON ON
Table 4. LDO enable status
4.10 Jumpers and test points
The board contains four jumpers and several test points. Table 5 and Figure 8 details
the jumper locations and their default configurations. Table 6 describes the test points
located on the NTS0304EUK-ARD board.
Ref Des Label Default Description
ON – SPI chain loop closed
J2 J2 ON OFF – SPI chain loop open
J7 J7 OFF OFF – OE Enable
Table 5. NTS0304EUK-ARD jumpers
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Ref Des Label Default Description
ON – OE Disable
1-2 / 3-4 / 5-6 / 7-8 – PORT A (U6) connected
J8 J8 1-2 / 3-4 /
5-6 / 7-8 OFF - PORT A (U6) disconnected
1-2 / 3-4 / 5-6 / 7-8 – PORT B (U6) connected
J9 J9 1-2 / 3-4 /
5-6 / 7-8 OFF - PORT B (U6) disconnected
Table 5. NTS0304EUK-ARD jumpers...continued
Figure 8. NTS0304EUK-ARD Jumper locations
Ref Des Label Description
TP1 B1 U6, PORT B
TP2 B2 U6, PORT B
TP3 A1 U6, PORT A
TP4 A2 U6, PORT A
TP5 A3 U6, PORT A
TP6 B3 U6, PORT B
TP7 A4 U6, PORT A
TP8 B4 U6, PORT B
TP9 VCC_3V3 VCC_3V3 rail
TP10 VCC_5V0 VCC_5V0 rail
TP11 VCC_3V3_MAIN VCC_3V3_MAIN rail
Table 6. NTS0304EUK-ARD test points
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Ref Des Label Description
TP12 VCC_5V0_MAIN VCC_5V0_MAIN rail
TP13 VCC_LDO OUT1 VCC_LDOOUT1 rail
TP14 VCC_LDO OUT2 VCC_LDOOUT2 rail
TP15 GND Ground
TP16 GND Ground
Table 6. NTS0304EUK-ARD test points...continued
5 Installing and configuring software tools
NTS0304EUK-ARD evaluation board is designed and built as a daughterboard working
in conjunction with an Arduino port equipped motherboard. The board was built to be fully
compatible with the following NXP Evaluation (EVK) boards:
•IMXRT1050 EVK Board
•LPCXpresso55S69 Development Board
•i.MX 8M Mini LPDDR4 EVK Board
Each of the above mentioned evaluation / development boards benefits by firmware
support which can be downloaded from NXP company site (www.nxp.com/). Before
starting, the EVK motherboard must be programmed with the corresponding firmware
package. Additionally, a GUI application (Windows 10) is available for download from
the NXP site, allowing rapid testing and operation of NTS0304EUK-ARD daughterboard
through the one of above mentioned EVKs. For details regarding installation of the
EVK firmware and GUI host software on PC please download UM11581 - Arduino
Shields GUI and firmware installation available at https://www.nxp.com/docs/en/user-
guide/UM11581.pdf. Once the software is installed, the first step is to select the correct
combination EVK – NTS0304EUK-ARD daughterboard, and then the board can be
controlled from the GUI interface. See Section 6 and Section 7 for more details regarding
the operation of NTS0304EUK-ARD from GUI software.
6 Configuring the hardware
6.1 Using the NTS0304EUK-ARD with an IMXRT1050 EVK board
Figure 9 shows the required hardware for operation of the NTS0304EUK-ARD
daughterboard with IMXRT1050 EVK. The following items are necessary:
•One IMXRT1050-EVK board
•One NTS0304EUK-ARD daughterboard
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
The IMXRT1050 EVK motherboard can be powered by one of the three methods:
•Connecting an external 5VDC power supply to the barrel power connector (J2) on the
board
•Connecting an USB cable from the PC to the Micro-B USB connector (J9) on the board
•Connecting an USB cable from the PC to the USB connector (J28) on the board. When
the PC is connected in this fashion, the USB port can simultaneously act as a debug
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interface. Therefore, by using a single USB cable connected to J28, the EVK can be
powered and at the same time linked to the PC for data exchange.
The older USB ports (from PC) are not able to deliver the necessary current (500 mA);
before establishing the communication, use an external power supply (connected to J2).
From J1 on the EVK board (see Figure 9) the user can select the power configuration for
the motherboard. For further details, see the i.MX RT1050 Processor Reference Manual
i.MX RT1050 Processor Reference Manual.
Figure 9. NTS0304EUK-ARD daughterboard and IMXRT1050 EVK board, before starting
To configure the hardware and workstation, complete the following procedure:
1. Configure the suitable power configuration of EVK (J1). If using J28 for power supply,
the J1 jumper shall be placed in position 5-6. If using an external power supply
(connected to J2), the jumper J1 will be placed in position 1-2.
2. Insert the NTS0304EUK-ARD daughterboard on the Arduino connector of the EVK
(see Figure 9).
3. Using USB connector J28, connect the EVK board to an USB port of the computer.
4. Install the IMXRT1050 target firmware (download from NXP site and see UM11581,
Arduino Arduino shields GUI and firmware installation manual for step-by-step
instructions).
5. Install GUI application (see UM11581, Arduino shields GUI and firmware installation
manual).
6. Open the GUI application to operate the device from the PC. For details regarding
GUI operation see Section 7.
Figure 10 shows the boards during the operation.
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Figure 10. The assembly NTS0304EUK-ARD daughterboard / IMXRT1050 EVK board operation
6.2 Using the NTS0304EUK-ARD with an LPCXpresso55S69 development
board
Figure 11 shows the required hardware for operation of the NTS0304EUK-ARD and
LPCXpresso55S69 EVK board. This configuration consists of:
•One LPCXpresso55S69 EVK board
•One NTS0304EUK-ARD daughterboard
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
The LPCXpresso55S69 development board is equipped with four USB Micro-B
connectors: P5, P6, P9 and P10. The board can be powered through any USB port.
Using P6 USB connector to connect the board to the PC simplifies the start-up operation
because P6 is designated for debugging and the USB cable thus accomplishes two tasks
at the same time: powering the board, and serving as a data link between the EVK board
and PC. For more details regarding power-up and operation of the LPCXpresso55S69
development board, see the UM11158 - LPCXpresso55S69/55S28 Development Boards
User Manual here.
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Figure 11. NTS0304EUK-ARD daughterboard and LPCXpresso55S69 mother board, before starting
The following steps describe how to assemble, program, and operate the configuration
shown in Figure 11.
1. Insert the NTS0304EUK-ARD daughterboard to P16 – P19 connectors located
on LPCXpresso55S69 development board (see the marked pins of P16 – P19,
Figure 11)
2. Connect the development board using port P6 USB port of PC
3. Install the LPCXpresso55S69 target firmware (download from NXP site and read the
EVK_Firmware_And_GUI_Install_Guide_For_Arduino_Boards.pdf instruction file)
4. Install GUI application on PC (see the instruction file called out in the previous step)
5. Open the GUI application to operate the device from the PC. For details regarding
GUI operation see Section 7
Figure 12 shows the two boards in operation.
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NXP Semiconductors UM11762
NTS0304EUK-ARD evaluation board
Figure 12. NTS0304EUK-ARD daughterboard / LPCXpresso55S69 motherboard operation
6.3 Using the NTS0304EUK-ARD with an i.MX 8M Mini LPDDR4 EVK
board
When an i.MX 8M Mini LPDDR4 EVK board is used with the NTS0304EUK-ARD board, a
third board (IMX8MMINI-IARD interposer board) must be used, especially designed and
built as an EVK – daughterboard interconnection. The EVK board i.MX 8M Mini LPDDR4
is not equipped with an Arduino port; instead it has a 2 x 20 pin expansion connector
(J1003, see i.MX 8M Mini LPDDR4 EVK user manual). J1003 is a multipurpose port,
containing various digital I/O lines, including specialized I2C and SPI buses. Starting from
the expansion connector pin chart, an Arduino port interposer board was developed,
with the role of signal-to-signal bridge between the 2 x 20 connector pins on the i.MX
8M Mini LPDDR4 EVK and the mated connectors of the Arduino port present on the
NTS0304EUK-ARD daughterboard.
To operate the setup, along with the EVK and the daughterboard, a third board must be
included in the setup assembly. Figure 13 shows the necessary boards and how these
boards are connected. The configuration consists of:
•One i.MX 8M Mini LPDDR4 EVK board
•One NTS0304EUK-ARD daughterboard
•One IMX8MMINI-IARD interposer board
•One USB-A / USB-C cable
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
It is recommended to attach the NTS0304EUK-ARD to the Arduino connectors of the
IMX8MMINI-IARD interposer board first, and then the resulting assembly to the i.MX 8M
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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