NXP UM11863 BRKTSTBAPx7250 Evaluation Boards User Manual

: June 9, 2024
: NXP

NXP UM11863 BRKTSTBAPx7250 Evaluation Boards User Manual

UM11863
BRKTSTBAPx7250 evaluation boards with FRDM7X-INTERFACE reference design
Rev. 1 — 15 December 2022

Document information

Revision history

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.

Introduction

This document is intended to help the user set up, configure and operate the BRKTSTBAPx7250 series evaluation boards.

The BRKTSTBAPx7250 is a set of three evaluation boards with all of the necessary headers, jumpers, and test signals to quickly evaluate the FXPS7250DI4S, FXPS7250DS4S, and FXPS7250A4S absolute pressure sensors, Digital Barometric Absolute Pressure (DBAP), and Analog Manifold Absolute Pressure (AMAP).

In addition, the FRDM7X-INTERFACE board provides a common interface allowing all three BRKTSTBAPx7250 types to be paired with any NXP Freedom MCU for which MCUXpresso project-based software is provided.

A blank PCB provided is also provided, BRKFXPS7XXX-PCB, to accommodate other pressure ranges. Users can populate the board with the selected pressure sensor and passives accordingly.

Whether using any of the BRKTSTBAPx7250 boards as a standalone in your evaluation platform or using the breakout boards paired with the FRDM7X- INTERFACE board and an NXP Freedom MCU board allows complete sensor evaluation.

Finding kit resources and information on the NXP website

NXP Semiconductors provides online resources for these evaluation boards and the supported devices on http://www.nxp.com.

The FXPS7X family of pressure sensors has several variants including analog, I2C, and SPI interfaces as well as five pressure ranges to accommodate many types of applications. The variants can be found at:

https://www.nxp.com/LPG_CNG_GAS_15-400KPA

The sensors product page provides overview information, documentation, design resources, buy/parametrics, and other applicable content. The design resources tab has the necessary hardware and software information for Getting Started. The Getting Started tab provides quick-reference information applicable to using the BRKTSTBAPx7250 evaluation board, including the downloadable assets referenced in this document.

The information pages for the MAP/BAP sensors, FXPS7250X, and the BRKTSTBAPx7250 evaluation boards can be found at:

Getting ready

NXP provides all required hardware and software for BRKTSTBAPx7250 evaluation. The BRKTSTBAPx7250 breakout board can also be used as standalone hardware, however this document is intended to use the NXP provided hardware and software as a kit.

Working with the BRKTSTBAPx7250 breakout boards requires the FRDM7XINTERFACE board and Freedom FRDM-KE15X MCU board. Additionally, software projects are available for easy evaluation.

As mentioned, the BRKTSTBAPDx7250 can be used as a ‘standalone’, not requiring any additional boards, however the user manual is specific to the NXP combined software and MCU board ecosystem allowing users to quickly bring up and evaluate the sensor.

Kit contents

The BRKTSTBAPx7250 comes as a single board. The box contents include:

Assembled and tested evaluation board in an antistatic bag
Quick Start Guide (web based)

Additional hardware

The BRKTSTBAPx7250 can be paired with NXP MCU boards of your choice, however there is an example project provided targeted for the FRDM-KE15Z MCU and the FRDMK64F Freedom boards for evaluation. Detailed information is provided in Section 4 “Getting to know the hardware”.

FRDM7X-INTERFACE board
FRDM-KE15Z MCU Freedom board for both I2C and analog option
FRDM-K64F MCU board for SPI options
A Windows PC is also required with installed software.

Assumptions

All three boards are connected together for use with the example demo software.

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.

Minimum system requirements

This evaluation board requires a:

Windows 10 PC workstation
FRDM7X-INTERFACE board
FRDM-KE15Z MCU Freedom board for both I2C and analog option
FRDM-K64F MCU board for SPI options

Software

Installing software is necessary to work with this evaluation board. All listed software is available on the information page for the evaluation board information page at: https://www.nxp.com/BRKTSTBAPx7250

Getting to know the hardware

Kit overview

The BRKTSTBAPx7250 breakout board incorporates an FXPS7250 fully integrated high-performance barometric absolute pressure (BAP) sensor consisting of a compact capacitive MEMS device coupled with a digital integrated circuit producing a fully calibrated digital output.

The BRKTSTBAPx7250 evaluation boards can be easily connected to an NXP Freedom MCU board via the Arduino headers for evaluation however they do require the FRDM7X-INTERFACE board for Arduino compatibility (See Section 6 “Configuring the hardware”). The following boards are recommended:

FRDM7X-INTERFACE
FRDM-KE15Z – For use with the Analog and I2C compatible breakout boards
FRDM-K64F – For use with the SPI compatible breakout boards

The user interconnects the boards for evaluation of the FXPS7250x pressure sensor with a terminal program using the NXP provided Component Library firmware. See Section 5 “Installing and configuring software tools” “Installing and configuring software tools”. In this case, the hardware combined with the software can help speed up development.

These evaluation boards provide an intuitive way to change between the sensor variants (pressure range) and communication protocols (I2C, SPI, or analog interfaces) for communication through switch position selections (FRDM7X- INTERFACE) as well as providing test points that can be used for evaluation. The FXPS7250x data sheets provide additional device information.

Board features

Each breakout board features its specific analog or digital output as described in Section 4.2.1 “Block diagram” through Section 4.2.5 “Switches”.

Block diagram

Example application block diagrams of the FXPS7250A analog, FXPS7250DI I2C and FXPS7250DS SPI pressure sensors incorporated onto the BRKTSTBAPx7250 are shown in Figure 1, Figure 2, and Figure 3.

Figure 1 shows the analog circuit setup for the FXPS7250A where the output signals interface to the host ADC/MCU.

Figure 2 shows the I2C circuit setup for the FXPS7250DI where the output signals interface to the host MCU.

Figure 3 shows the SPI circuit setup for the FXPS7250DS where the output signals interface to the host MCU.

Kit featured components

Figure 4 identifies important components on the board and Table 1 provides additional details on these components.

Table 1. Evaluation board featured components location

Connectors

Table 2. Evaluation board featured components location

Test points

The test points on the breakout boards are for NXP internal testing only and are not for customer use.

Table 3. Test point locations

Switches

The FRDM7X-INTERFACE board consists of one, four position switch, SW1. SW1 is used to adapt the FRDM7X-INTERFACE board to any of the three BRKTSTBAPx7250 breakout boards communication protocols; analog, I2C, or SPI.

Schematic, board layout, and bill of materials

The schematic, board layout, and bill of materials for the BRKTSTBAPx7250 series breakout boards are available at their respective URLS as detailed in Table 4.

Table 4. Breakout board URL locations

Installing and configuring software tools

NXP provides Component Library software examples for quick evaluation and prototyping. The demo projects are targeted to the FRDM-KE15Z (analog and I2C) and FRDM-K64F (SPI) and is located under Design Resources, Software, BSP, Drivers and Middleware at the following link:
https://www.nxp.com/BRKTSTBAPx7250

The link opens the “Sensor Drivers for NXP Sensors” page. To download the FXPS7xxx sensor driver with examples, scroll down to the “Downloads” section.

For additional information about Component Library, refer to UM11516[1], Component

Library – Sensor Drivers Component user manual and UM11515[2], Component Library – Getting Started user manual.

Configuring the hardware

Figure 5 presents the hardware configuration incorporating the BRKTSTBAPx7250 development board, the FRDM7X-INTERFACE board, the FRDM-KE15Z MCU board. The evaluation kit is then connected to a Windows PC with a USB cable.

The only development board configuration required are the settings of the four SW1 positions on the FRDM7X-INTERFACE board. The fours SW1 positions are set to the protocol (analog, I2C, or SPI) of the corresponding BRKTSTBAPx7250 breakout board.

Table 5 shows each switch position relative to the development boards output protocol where they are defined as follows:

SW1: 0/1 positions

0 position is to the right (signal low)
1 position is to the left (signal high)
‒ Don’t care

Table 5. Typical initial configuration

Tool interface (GUI) description

The software outputs data to a terminal program such as RealTerm or TeraTerm to display the pressure data. The settings required are ASCII display, 115,200 Baud, no parity, eight data bits, and one stop bit.

Once the project is compiled and running, the terminal program displays the pressure data.

References

[1] UM11516 – Component Library – Sensor Drivers Component, https://www.nxp.com/docs/en/user-guide/UM11516.pdf [2] UM11515 – Component library – getting started user manual, https://www.nxp.com/docs/en/user- guide/UM11515.pdf

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Date of release: 15 December 2022
Document identifier: UM11863