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SPI

Forum Post: ADS1216 Demo Board and SPI

Timothy Oddy

We had a student working for us over the summer, and he was trying to interface an ADS1216 to a microcontroller board. He got some simpler SPI devices to communicate reliably with the microcontroller, but had problems getting the ADS1216 to return a valid stream of data. In an effort to first get a...

on Sep 22, 2009
Forum Post: ADS8330/ SPI interface

Flamingo

I'm trying to get the OMAP-L137 to drive the ADS8330 via the SPI1 interface. I need to transmit slower than the SPI-provided XEVT event. Ideally, I'd like the INT output of the chip to trigger an EDMA event that will transmit the 16-bit word. I'm not having any success because I do not...

on Oct 1, 2009
Forum Post: Re: About ADS8326.

Tom Hendrick

Hi Mark, From a hardware standpoint - If you can share your schematic along with the scope shot of the timing, that would be helpful. Assuming everything is wired correctly, can you tell me if what you see on SDO actually matches what is returned in your code as 'result'? If you apply a stable...

on Nov 26, 2009
Forum Post: Re: ADS1248 partial reading

Joseph Wu

Max, Yes, you should be able to read out the ADC in single byte increments and disable the CS between each byte read. While the CS will reset the SPI input communications, it will not reset the DOUT. To do this you would give a single RDATA command and read out the next three bytes. You would not...

on Dec 3, 2009
Forum Post: ADS1248 partial reading

Max Sonnaillon

Hello, I need to read the conversion result (24bits) in 3 steps of 8bit each. The datasheet says that this can be done, but it is not clear if I can disable the CS (CS signal to high) between each 8bit transmission. I need to read the 24bits in 3 steps because I am using the SPI for other devices with...

on Dec 3, 2009
Forum Post: ADS 8330 interface problem

Kindalate

Hi, I am using PIC24HJ to retrieve data from ADS 8330. Manual trigger, Internal OSC clock. The code is simplified as below trying to single out the problem... ////////////////////////////////////////////////////////////// unsigned int SDIData; unsigned int result; ADC_CS=0; ADC_SPIBUF = 0x0000;...

on Dec 4, 2009
Forum Post: Cabling and Signal Conditioning for serial PCB connections

Brian Willoughby

Are there any Application Notes which discuss design recommendations for cabling choices and signal conditioning when connecting serial data between boards? I am working with the ADS7951 and ADS7953 on a board with the TMS320VC5506. These converters have a maximum clock rate of 20 MHz and a maximum...

on Oct 10, 2009
Forum Post: Guidelines for posting Precision Analog - Data Converter related topics

Tom Hendrick

Hi All! Welcome to the Precision Data Converter Forum! This forum supports the analog-to-digital (ADSxxxx) and digital-to-analog (DACxxxx) devices found on www.ti.com in the <=10MSPS categories. When posting to this forum, please try to provide as much information about the problem(s) you are experiencing...

on Jan 28, 2010
Forum Post: Cheap interfacing for 5V powered ADS1243 with a 3.3V SPI bus

fbj

ADS1243 is one of the performant TI devices that can be found easily from online store. Unfortunately ADS1243 has no separate Vcc and Vdd power rail for analog and digital circuits and it requires a full-scale reference voltage that can reach the Vcc power rail only if Vcc is 5V. So, choosing to power...

on Nov 25, 2009
Forum Post: ADS1271: MSB sent twice

Alice Pavanini

Hello, I'm using ADS1271, data rate 1 KHz, SPI interface. Most of my samples are correct but quite often I read one of these: - samples with most significant byte sent twice (first and second byte are the same) - samples with every one of my threee bytes shifted by some bits (for example...

on Mar 31, 2010
Forum Post: TLV5616 DAC - SPI: Sending Data Twice?

Jonathon Reinhart

Hello, I'm using a TLV5616 12-bit DAC, and controlling it via SPI from an Atmel 8-bit AVR processor (AT90USB1286) (A Teensy 2.0++): I'm controlling the /CS and FS lines from software. Only SCLK and MOSI are controlled automatically via the chip's SPI module. Currently, it is working...

on Apr 6, 2010
Forum Post: ADS1258 channel data read (Register format)

horizon

Hi all, I am using ADS1258 in my multi-channel continuous acquisition system. Till date I have been doing channel data read direct to fetch all the conversion results. The DRDY pulse is used to interrupt my controller which reads data on every DRDY pulse. Hence for an 8 channel system there would...

on Apr 9, 2010
Forum Post: ADS1158 <-> MSP430 SPI communication

Sergey Tarassenko

Hello all I had recently to implement SPI communication between MSP430 and ADS1158. That's my almost first experience with SPI therefore I'm not sure if my method is correct (Though it gives me correct results.). Could you please confirm If I'm using correct procedure? SPI configuration...

on Apr 19, 2010
Forum Post: SPI Serial Data Output (SDO) has a Long Rise Time

Grant10435

I am interfacing an ADS8332 to a TI DSP over the SPI line. All my data signals look alright except the adc data output line (SDO). The attached waveform, labeled CH2 (blue), illustrates the problem. All the SPI pins on the DSP have their internal pull-ups enabled. Thanks for the help. CH1: CLOCK...

on May 19, 2010
Forum Post: ADS1271: F_SCLK faster than F_CLK

Sergio L.

Hello, We're porting a design from a previous ADS to ADS1271. The system uses the SPI interface to read data with F_SCLK = 15 Mhz, but the conversion clock is set to F_CLK = 300 Khz aprox. This violates the technical specification, which states that fSCLK must be lower or equal than fCLK. We...

on Jun 1, 2010
Forum Post: How to peform SPI DMA on two channels of ADS7863 (or other ADC with two SPI interfaces).

Sanjay52975

Objective: To obtain simultaneous data from two ADCs within ADS7863 ADC to two SPI buses on OMAP. Architecture: SDOa and SDOb – Two SPI outputs from ADS7863 . SPI1, SPI2 two SPI devices on OMAPL137. The two SPI buses are connected as: ADS7863 OMAPL137 SPOa SPI1 MISO....

on Jul 6, 2010
Forum Post: Re: How to provide CONVST (Conversation Start) using SPI DMA to ADS7863

Sanjay52975

We could not find a document to drive RD+CONVST using an SPI port - that would be an ideal solution for us. We found an example driven by McBSP. This does not work for us since we need to drive two SPIs simultaneously using a DMA. Do you think that we can get the DAC data connecting RD+CONVST to ...

on Jul 21, 2010
Forum Post: How to provide CONVST (Conversation Start) using SPI DMA to ADS7863

Sanjay52975

We are using ADS7863 in pseudo differential mode I i.e. 3 x 2 non differential signals are output to SDOA, SDOB. We need to get the Data in the DMA mode? Question: How do we drive the CONVST (Conversation Start), RD and CSbar pins? The application note suggests connecting CONVST to RD and CSbar...

on Jul 20, 2010
Forum Post: Re: ADS1298 open source design help request & this will assist open source and development & interest in the chip

josh wojnas

I just sent out a TQFP version of this with much less pieces on my website. https://sites.google.com/site/openloopproject/Home/code-valt The design files are in the free and open source kicad software. The folder is ads1298 The zip file is NeuroCyberProstheticsSensor-0.zip...

on Aug 19, 2010
Forum Post: hybrid chip select & daisy chaining master and slave ads1298

josh wojnas

SPI reading different sensors by Chip select or daisy chain them? Should a combination of the 2 methods be used? master ads1298 creates clock and references slaves acsept clock and references... slaves are daisy chained one is chip selected... master is chip selected to talk to it. ...

on Jul 8, 2010
Forum Post: ADS8556 connected to OMAP-L138

oh_no

Hi, all! I have ADS8556EVM and OMAP-L138 eXperimenter Kit. Solve a problem to connect these devices. I expect to use the SPI interface. Since the OMAP-L138 has 2 SPI interface, it will transmit data from all channels of ADC fast enough. On the ADS8556 I set SEL_A, SEL_B to 1, and SEL_C to 0. Thus...

on Sep 15, 2010
Forum Post: ADS855xEVM Problems

Ted Konetski

I am using an EVM for the ADS8558 6 channel converter and am having a problem getting it to perform. First here is my purpose, have to sample 6 signals at 42KSPS. The signals are from 0 - 5V and the processing I do later on requires 16 bit resolution. Yes I know that the 8558 only does 12, I will...

on Sep 23, 2010
Forum Post: ADS1241 clock frequency

Alice Pavanini

Hello, I'm using ADS1241and I experienced the following problem: when I use it with a crystal like 4.9152MHz it works correctly. But when I use the internal oscillator of my MCU (for example, 4 MHz or sub-multiplies) or even a 4 MHz crystal, it starts shifting out data on DOUT without waiting...

on Oct 8, 2010
Forum Post: Problem communicating with ADS1259 using MSP430 SPI

UTB

Hi, I am using the MSP430 in the ez430-RF2500 development kit to communicate with an ADS1259 via SPI. I am trying to initialize the ADC with the following Code Composer code, but it doesn't seem to work. The MSP430 gets stuck during "while (!(IFG2 & UCB0RXIFG));" as if it can't...

on Nov 1, 2010
Forum Post: Re: ADS1248 connecting to MSP430

Patrick Broucke

Dear, i have some trouble by reading the register from the ADS1248. I wrote a Test code to verify my SPI connection and i can't get the values of the registers. Maybe i missapply. Can someone have a look on my code, pleas. i use the MSP430f2274... #define WAKEUP 0x00 #define SLEEP...

on Nov 12, 2010