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Questions tagged [nxp]

NXP is a manufacturer of semiconductors, both ICs and discrete components.

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Equivalent Series Resistance of 13.56 MHz RFID Antenna

I am designing a system that uses the MFRC522 by NXP Semiconductors and I am having a bit of difficulty designing the antenna. NXP provide an antenna design guide under the application note AN1445 ...
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How much maximum voltage and current passive NFC generate at FD and VSS pin

I am working on NFC tag - NTAG 21X series and I can see there are 2 pins FD and VSS. I want to know how much maximum current and voltage it can generate when it come closer to active NFC tag ( or ...
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What is the maximum supported I2C mode in the FS32K146?

In the S32K146 user-manual guide, it is mentioned as High-Speed mode is not supported by this device. (Page 1481). But in the coming section of the user-manual it is mentioned as device support HS ...
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29 views

What are the possible boot modes in the S32K146 (NXP S32K Series MCU)

I have been investigating S32K146 MCU boot modes and possible mode selection options. I am interested to know the possible boot modes and how it can be set up. From datasheet (Page -92): It can be ...
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smart card using LPC11u1x via USART

I try to implemet communication with smart card via USART on LPC11ux. There is special smartcard mode on it, but I realy mixed up with one thing: user manual says, that when smartcard mode is used, ...
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26 views

Is it possible to use LPCXpresso804's SWD pins to connect the LPC804's SWD on my custom-made board?

I have a custom-made board with an NXP's LPC804. Our debug interface is SWD: I also have an LPCXpresso804 evaluation board. Is it possible to connect wires from the LPCXpresso804's SWD pins to my ...
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27 views

NXP LPC-Link 2 hangs when flashing and debug

im using a JTAG probe NXP LPC link 2 , with IAR Embedded workbench and procesor LPC1766. for some reason when i compile and try to load either a debug or release firmware onto the LPC1766 , it works ...
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31 views

TWR-VF65GS10, how to programm? [closed]

We have a task to design IEEE 61850 compatible board. So we considered several options for MCU for the board: stm32f7xx series or something more powerful like NXP MVF6xx series or Sitara AM3358 series....
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39 views

KTY82/220 Temperature sensor terminals

I wanted to use NXP KTY82/220(https://www.nxp.com/docs/en/data-sheet/KTY82_SER.pdf) temperature sensor for my circuit. But I could not see which are the terminals for Vdd, GND and Analog Out in ...
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82 views

Accelerometer MMA8451 issue

We at my company, has a very strange issue regarding til MMA8451. We are experincing that our accelerometers data can be suddenly wrong over time. We have approximately 250 devices out, running in ...
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23 views

Writing 32 Bit Data value SPI NXP K66

How would I send 32bit data values using SPI of K66.. here is my attempt. The problem is only some parts of the 32bits are shown in the scope ...
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71 views

Debugging SPI problems on NXP K66

I'm trying the sample provided by K66 SDK from NXP and it doesn't work at all. I attached a scope and monitoring the data that is transfered from the uC to the slave but nothing is there. I have ...
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13 views

MPL3115A2 reads a lower pressure

I found a similar question here, but for that user the difference between readings are very small (about 360 Pa) and within the ±400 Pa indicated in the datasheet. In my situation, instead I read 979 ...
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1answer
52 views

i2c probe happens only alternatively

I have connected a NXP NFC Module (pn7120) over I2C to i.MX6 Board. I tried to check whether the device is detected in the i2c probe command. It didn't detect in the first call, but got detected in ...
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369 views

i2c read error but probe succeeds

Can you please tell me a scenario where i2c probe gives the slave address but i2c read command fails..
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63 views

Can I use this Sensor and How?

I am thinking of using honeywell SNDH-H3C-G05 hall effect speed sensor with a microcontroller to get the wheel speed. Here is its Datasheet. Can I use this sensor with microcontrollers like Arduino ...
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2answers
60 views

How is a NFC “connected tag” different from a full blown NFC reader?

I have played with NFC in the past, but those were full blown "NFC readers" based on NXP pn53x chips. I want to know, how is a so called "Connected tag" different from NFC readers? I found this chip ...
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93 views

LPC1343 double pin functions

I was looking to create a LPC1343 development board, but I noticed something odd. If you look at the pinout for this MCU you can see double functions for some pins. This is common, so you can program ...
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1answer
101 views

smart card clocking using NXP

In my current project, I'm trying to implement a smart card reader using LPC1788 which has a built-in smart card interface. Smart cards use the ISO7816-3 standard to communicate with the outside world....
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1answer
97 views

Power on reset and watchdog signal combination question

I'm working with the i.MX RT1050 processors and designing a POR circuit. I found the following circuit in the reference design but I don't understand how it's meant to work. The UM805RE is a voltage ...
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2answers
176 views

FatFs f_write not working in LPC1788 Timer ISR

I’m using LPC1788 MCU with KeilV5 compiler. I Have a Timer ISR in which I read a value form specific ADC channel and write it into a SD-Card using FATFS library. Here is my Timer ISR code: ...
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64 views

Problems with callback for timer Jn5169/5168

I am trying to use Timer3 on JN5169 with an Interrupt callback on falling edge. The clock source is the main clock source and I am configuring it with a pre-scaler value of 8. PWM output is disabled. ...
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129 views

Send serial data to a specific Zigbee Node with HA (NXP Zigbee HA)

I have a Zigbee End-device based on JN5168 from NXP I want to release it as a lock that is battery powered. Apart from accepting the HA lock cluster commands, I need to send some custom data (some ...
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86 views

ethernet connection of nxp processor [closed]

ı designed a circuit schematic by using altium designer to ethernet connection of my processor (nxp lpc43s50fet256) ı added a circuit schematic as altium designer file .You can see my complete ...
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45 views

Lpc 43s50FET256 processor and its connections

ı want to buy a nxp LPC43S50FET256 processor and ı made some research but I dont know whether lpc43s50 has already got bridge connections, ı also dont know for example whether ethernet is already ...
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48 views

Pressure sensor port as vacuum means?

Pressure sensor used in my project is MPXV5010DP. Here is the datasheet In the datasheet, It is noted that port-2 should be kept as vacuum. What is mean by vacuum? Should I have keep port-2 as open ...
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1answer
369 views

Not getting proper acknowledgement and stop condition on I2C bus

I am trying to communicate Kinetis K60 tower board with a Cypress IC CY8CMBR3116 cy8320 development board as slave IC. There are only two devices on the I2C bus. I am attaching a snapshot of the ...
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2answers
294 views

Function of solid plane in the NFC antenna

Below picture shows 2 NFC antenna designed by NXP for their NFC chips . As you can see there are square planes in the middle of antenna,these planes have no Nets(does not connected to any where ). ...
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192 views

RS485 half duplex communication problem with K64

My board has a K64 NXP controller with half duplex RS485 comm., as shown here: It is installed on a big machine with lots of other electronics/mechanics going on. I have 2 boards on the machine. Each ...
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1answer
64 views

What is the relation between DAC peripheral bus and conversion/settling time

Going through the datasheet and the LPC17xx user manual, what is quite evident is how to select the various clocking options for the peripheral clock divider, i.e: ...
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2answers
248 views

C programming syntaxes for NXP LPC1768

My question may seem weird, but I am very new in nxp micro-controllers. It seems to me that people use different syntax in C programming. For example, in order to set a pin as an output we have: <...
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80 views

How much embedded program memory in this NXP (aka freescale) KL03 processor?

Is there a way to find out how much programming memory is in an NXP (aka freescale) KL03 ARM processor? The markings on the chip say "P03T5V" and "PSABA". There is this NXP package number lookup web ...
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239 views

How to get I2C to shut up while waiting for data in master transmit mode on LPC1114

I have an LPC1114(FN28) that I am writing some code for. Currently I am trying to provide an asynchronous view of the I2C interface to my code (the chip has a built-in I2C controller). The controller ...
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1answer
403 views

GPIO speed in LPC812 Cortex-M0 MCU from NXP

Based on datasheet page 17: GPIO registers are located on the ARM Cortex M0+ IO bus for fastest possible single-cycle I/O timing, allowing GPIO toggling with rates of up to 15 MHz. And I used a ...
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1answer
77 views

How do I calculate maximum current that each pin of PC8575 is able to sink?

http://www.nxp.com/documents/data_sheet/PCF8575.pdf Can somebody tell me which parameter one should look for while looking for calculating maximium Current source/sinked by a pin.
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78 views

LPC4088 - pin no. 1

I am dealing with LPC4088 microcontroller and I have a problem because I am not sure where is the pin no. 1. In the documentation it says there is a dot to index the pin: But in reallity it looks ...
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1answer
347 views

MC68000 Modern Equivalent (or can/should I use NRND/EOL chips)

I am designing a SBC that will feature the Motorola 68000 (or one of its descendants) but am having trouble finding new chips. The only chips that I have been able to find on Mouser or Digi-Key are ...
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1answer
381 views

LPc11u68 Recognized as an USB mass storage device even when programmed in HID class

When I connected a newbie LPC11u68 to USB port,it recognized in windows as an USB mass storage device.When I programmed LPCOPEN HID example by Flash magic to it,after resetting the board,my PC can't ...
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2answers
125 views

NXP arm microprocessor memory erase - no JTAG

I am fiddling around with NXP LPC2368. Recently changed the PLL clock control registers, and as a result JTAG stopped working, so I am unable to program or erase the chip. My question is, is there ...
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1answer
280 views

SD Card Reader with LPC43xx

I am trying to implement an sd card reader on lpc43xx devices. For this I can make use of the LPCopen examples that use the ROM based drivers. However for some reason the ROM based driver example ...
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2answers
115 views

UART is acting weird

I programmed UART3 peripheral on LPC4088 to send a single unsigned character posiljka over Tx line. This is done by continuously copying this character into the ...
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1answer
104 views

LPC1110 confusion about default system clock and uart baud rate

I'm trying to get acquainted with ARMs on example of LPC1110 device. And there is some confusion about selecting baud rate for UART. I suppose it is running at ...
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2answers
93 views

Why is Vtyp less than Vmin on a CMOS chip

Regarding the chip 74HC08 On the table describing Static Characteristics (Section 9). Why is the typical VIH lower than the minimum value. And vice versa for VIL
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Output clock of the LPC1768?

I am using NXP's LPC1768 development board and I came across the User Manual for this part and page 67/849 section 4.10 descusses the External Clock Output. I couldn't figure out which pin out of the ...
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2answers
500 views

SDXC Card Reader with LPC1822

in my application I have an SD Card reader using the NXP LPC1822 microcontroller. It works very good with all SD- and SDHC-Cards I've tested so far. Only thing that does not work is SDXC. I already ...
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44 views

NVT I2C bus capacitance

I would like to use NXP NVT20XX as bidirectional voltage-level translator in my system (I2C at 100kHz, 6 slaves) and I only don't understand one thing. I am little bit confused. In the datasheet they ...
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1answer
423 views

LPC43xx External Static Memory - Multiplexing of Address/Data lines

We would like to tightly-couple a FPGA with a µC by means of the external static memory memory controller, thereby effectively mapping the FPGA registers into main memory of the µC with maximum ...
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244 views

LPC2148 + Eclipse + yagarto + openOCD. Issue with the interrupts

I'm using 'Eclipse-Indigo' + yagarto + 'openocd-0.7.0' setup for a project on LPC2148. I've set up the environment properly. I'm able to compile, link and debug the project. I've configurred Timer0 &...
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1answer
760 views

Optimal configuration for PLL on LPC17xx

I'm trying to write an algorithm that would pick the best available PLL0 configuration for the user based on F_in and F_cclk. The manual says that I should pick higher F_ref if possible for a more ...
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2answers
2k views

Flyback SMPS Transformer choice

In several projects so far, I have been using old "fashioned" transformer based power supplies. However, this time around I want to use a switching mode power supply. The supply will be used to power ...