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UC3907: UC3907: circuit review,LOAD SHARE CONTROLLER

June 1, 2018, 12:06 pm
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Part Number:UC3907

Hello anyone please help me. I have two power supply giving out an dc output of 24.50. i would like to load share two power supply using this IC. I was looking for a application manual or something which clearly shows me the circuit  i need to follow and the calculation I need to do. Can anyone please guide me.

Thank You

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CCS/F28M36P63C2: EPWM outputs issue

June 1, 2018, 12:10 pm
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Part Number:F28M36P63C2

Tool/software: Code Composer Studio

Hello,

How do i make EPWM 1A and EPWM 2B look identical and disable EPWM 1B and EPWM 2A at the same time?

I tried it this way

// Action Qualifier SubModule Registers
    EPwm1Regs.AQCTLA.bit.CAD = AQ_SET;
    EPwm1Regs.AQCTLA.bit.ZRO = AQ_NO_ACTION;
    EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR;

    EPwm1Regs.AQCTLB.bit.CAD = AQ_NO_ACTION;
    EPwm1Regs.AQCTLB.bit.ZRO = AQ_NO_ACTION;
    EPwm1Regs.AQCTLB.bit.CAU = AQ_NO_ACTION;


        EPwm2Regs.AQCTLA.bit.CAD = AQ_NO_ACTION;
        EPwm2Regs.AQCTLA.bit.ZRO = AQ_NO_ACTION;
        EPwm2Regs.AQCTLA.bit.CAU = AQ_NO_ACTION;

        EPwm2Regs.AQCTLB.bit.CAD = AQ_SET;
        EPwm2Regs.AQCTLB.bit.ZRO = AQ_NO_ACTION;
        EPwm2Regs.AQCTLB.bit.CAU = AQ_CLEAR;

Ironically i am getting identical outputs on EPWM 1A and EPWM 1B.

No outputs in EPWM 2A and EPWM 2B??

Any insight is appreciated,

Thank you,

Srini

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TIDA-01187: TIDA-01187

June 1, 2018, 12:26 pm
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Part Number:TIDA-01187

In the document: LIDAR-Pulsed Time-of-Flight Reference Design Using High-Speed Data Converters you describe the hardware implementation for ToF or DSP based options. What is the advantage of the second one? Would you point me to additional material supporting the advantage of this method vs the standard ToF? do you have more experimental data supporting this methodology?

Thanks,

Jacek

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AFE4490: AFE4400SOPEVM

June 1, 2018, 12:40 pm
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Part Number:AFE4490

Hi,

I have a AFE4490SPOEVM kit and I installed the GUI.

Here is the question:

After I connect the board and the GUI show "CONNECTED" and Ready for new command, I try to capture data. However, it shows "reading stopped without returning the expected number of samples. please check the device and the inputs."

Now I am using finger oximeter(for AFE4400SPOEVM rather than AFE4490, is this matters?) do the recording.

Best

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RTOS/CC2640R2F: Using CACHE_AS_RAM=1 with OSAL_SNV=1

June 1, 2018, 12:51 pm
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Part Number:CC2640R2F

Tool/software: TI-RTOS

Hello,

I only want to use 1 SNV page in my application to save flash space. According to the BLE SW Dev Guide, when OSAL_SNV is set to 1, "flash compaction uses flash cache RAM for intermediate storage." In my project I am running low on RAM, so I am using the 8KB cache region as RAM. Given that this cache region is already being used by my application, how will SNV compaction of the SNV area be affected? Will the operation fail in any way or am I fine using this configuration?

Thanks,

Keron

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AFE5818EVM: AFE5818EVM

June 1, 2018, 12:56 pm
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Part Number:AFE5818EVM

Hi 

I am Maruthi (postdoc @ UCBerkeley). I had recently bought AFE5818 EVM and also TSW1400EVM  for collecting data fron it. 

I have probelm with HMC DAQ program. I am getting following error when trying to install this software (see below figure pasted) : I think this software has some bugs. Can you please tell me where to download correct software or how to fix this major isse? 

I am following installation procedure mentioned in this AFE5818 EVM link - www.ti.com/.../slou430a.pdf

Thanks

Maruthi 

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CCS/MSP430FR2111: Code porting ADC functionality from MSP430G2131 to MSP430FR2111

June 1, 2018, 1:04 pm
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Part Number:MSP430FR2111

Tool/software: Code Composer Studio

Hello,

I am working with a motor driver evaluation module (DRV8837EVM) where I am replacing the existing MCU (G2131) with an FR2111.

The idea is to get everything functioning the way it was with the G2131 but with the FR2111.  

I already have everything set up hardware wise. I have identified the ADC channel as P1.1 on the FR2111. However, I need assistance when it comes to porting the code over in order to enable the ADC in the FR2111 to read the potentiometer thats included on the DRV8837EVM.

The current code for the ADC on the G2131 on the EVM is:

The code i currently have for the FR2111 is here:

How do I get the ADC initialized so that I can use the potentiometer with the FR2111?

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Ultrasonic sensor/transmitter circuits

June 1, 2018, 1:06 pm
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Hello, I am looking to build an indoor positioning system with the different transmitters and receivers. I plan to transmit with one transducer and receive with at least five to accurately predict its location in space. Are you able to guide me a little bit in the design of this system? I'm really not sure where to start. I understand that the transducers will operate at 40 kHz and will be powered by a 12 V input that must be changed to an AC input and amplified, but I am getting lost in the technical lingo. Would you be able to suggest anywhere that I can go to learn about the basics of a circuit like this? In layman's terms, I believe I'll need to design two separate circuits: one for sensing and one for transmitting.

Thanks,

Danny Morrow

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TMS320F28379D: Some register bits regarding valley switching are not defined

June 1, 2018, 1:08 pm
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Part Number:TMS320F28379D

Hi

For valley switching in type 4 ePWM, I found there is no definition in register

DCFCTL.EDGEMODE. Can any one tell me its definition?

thanks,

Jiakai

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BQ25601: What is the Minimum input and output capacitance required for the bq part.

June 1, 2018, 1:11 pm
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Part Number:BQ25601

Hi Support Team

My Customer has a question regarding the what the minimum capacitance is required for operation on the bq charger. They are having a serious issue getting cap and are being forced by their manufacturer to use smaller sized cap. When using the smaller caps they are finding that the "real effective" capacitance is much smaller than expected due to the voltage coeff. So for example an 0805 10uf cap when switched to a 0605 10uf may be as low as 2uf in their system (with a charging voltage of 12v). This is a very high volume application and they need to understand minimum requirements for stability. 

Thanks

Jeff Coletti

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CCS/MSP430G2553: MPU9150

June 1, 2018, 1:12 pm
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Part Number:MSP430G2553

Tool/software: Code Composer Studio

someone who can help me with code examples to communicate msp430g2553 with a mpu9150

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FDC2212: Spec clarification

June 1, 2018, 1:24 pm
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Part Number:FDC2212

I have some questions about a capacitive sensing application. We have a potential application where we’d like to measure capacitance with the following specs:

    • Minimum 1 kHz sampling (higher is better)
    • Want to measure capacitance change of approximately 50pF (some applications may have capacitance change up to 200pF), with a fixed offset in the range of 30pF-60pF. For example, if the offset was 40pF we’d want our total measurement range to be at least 40-90pF.
    • Ideally resolution for this measurement range and sampling rate would be on the order of femto-farads.

 

It looks like the FDC2212/FDC2214 devices from TI are close to meeting our needs, but the specs for sampling rate vs resolution aren’t real straightforward from the datasheet as they’re dependent on the configuration and device settings. I have some initial questions below. I’m wondering if you could help with these or put me in touch with someone who can.

 

  1. On pg 14 of the datasheet, Table 1 indicates that the maximum reference frequency for single channel mode is 35 MHz, but there are multiple examples in the datasheet (pg 6 “Note 6”, pg 9 “8.8 Typical Characteristics” test conditions, pg 45 “10.2.4 Application Curves” test conditions) that seem to suggest operation in single channel continuous mode with a 40 MHz reference clock.
  2. The datasheet (pg 16) says that the “settling wait time” should be set to a value that is long enough to allow stable oscillation. If the device is set to single channel continuous sampling, is a settle count > 0 required? Or is the settle count only required before the first reading and when sequencing between multiple channels on the device?
  3. There is some discussion about Effective Number of Bits (“ENOB”). The datasheet indicates that for 13 effective bits, 2^13 = 8192 clock cycles are required (pg 17). This corresponds to RCOUNT = 0x0200 (0x200 = 512, 16 clk cycles per RCOUNT). But if I enter 512 into the Sensing Solutions EVM GUI for the FDC2214EVM demo board, it indicates ENOBmax = 14. Is this just a bug in the application or am I missing something?

  4. It’s not clear to me what this effective number of bits represents. If the ENOB is 13, does that mean the resolution of the output is essentially 0Hz to the reference frequency in 2^13=8192 steps? This is my assumption for the calculation below.
  5. My initial estimates based on my current understanding of the specs is that we’d have a resolution of 10’s to 100’s of femto-farads in our measurement range. This is based on the following assumptions:

      • Fref = 40MHz
      • Settle count = 0 (single channel continuous mode)
      • Reference count =  2498
      • L = 18uH
      • Cfixed = 33pF
      • Cvariable = 30-200 pF
      • Sensed frequency resolution = (2498*16 = 39968) steps over 40MHz = 1.0008 kHz resolution
      • Capacitance is proportional to 1/f^2, so does not have a fixed resolution.

          • With Ctotal ranging from 233 pF down to 66 pF, we’d have Fsense ranging from 2.458MHz up to 4.725MHz
          • At 2.458MHz, a 1.0008kHz frequency step corresponds to a capacitance change of approximately 190 fF
          • At 4.725MHz, a 1.0008kHz frequency step corresponds to a capacitance change of approximately 27 fF
          • This resolution is about 10 times higher than we’d like for the application.

 

 

If you have any other products that you think would meet our target requirements I’d be interested in learning more.

Thanks

Viktorija

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WEBENCH® Tools/DS90LV110T: IBIS Model

June 1, 2018, 1:24 pm
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Part Number:DS90LV110T

Tool/software: WEBENCH® Design Tools

Hello all, I have an Assigned military customer that is requesting an IBIS Model for the DS90LV110T device.  Is this something you can provide or create for the customer?

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CC2640R2F: Bluetooth 5 number of connections to phone

June 1, 2018, 1:43 pm
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Part Number:CC2640R2F

Hello Bluetooth Team,

Some general Bluetooth questions:

How many peripherals (CC2640R2F) can be connected to an iOS device or Android device?

In the Bluetooth stack on CC2640R2F, is it possible to dynamically change the device name during advertisement?  I would think yes since it's similar to a beacon's operation, but please confirm.

Thanks,
Darren

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AM5728: Weston.ini output

June 1, 2018, 1:43 pm
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Part Number:AM5728

Hi,

I am fixing weston to launch on a connector by running the command: 

weston --tty=1 --connector=36

However when I plug in the HDMI, it disrupts the existing connection to connector=36. Is it possible to prevent weston from reacting to hot plugged displays such as HDMI. From my understanding weston receives these events from udev. Is it possible to add rules to ignore available HDMI connections?

I noticed that it is possible to add something like this to weston.ini:

[output]
name=LVDS1
mode=1920x1080
seat=seat1

Which output names would be applicable for the AM5728? Where can I find them? Is it the names seen in modetest (example: HDMI-A-1) ?

Thanks,

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OPA196: OPA196 distortion

June 1, 2018, 1:46 pm
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Part Number:OPA196

Hi team,

OPA196 seems to be seen some distortion in the following condition.

Evaluation in voltage follower
- Positive supply = +24V
- Negative supply = -5V
- Input signal frequency = 500kHz
- Input voltage amplitude = 1Vpp
- Load : 1Mohm + 15pF

If you had already identified some distortion in the similar condition to the above, please let me know the reason why the output waveform is distorted.
If you have not seen it, please try to duplicate it in the above condition.

Best regards,
Iwata Etsuji

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CCS/MSP-EXP430FR5994: problem running software example for MSP-EXP430FR5994 launchpad and BOOSTXL-AUDIO

June 1, 2018, 1:59 pm
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Part Number:MSP-EXP430FR5994

Tool/software: Code Composer Studio

hello, I'm trying to run AUDIO_RecordPlayback_MSP430FR5994 software example using MSP-EXP430FR5994 launchpad and BOOSTXL-AUDIO BoosterPack plug-in module. while pressing the switch S1 on MSP-EXP430FR5994 development board, the Led 1 is blinking and while pressing switch s2 led2 is blinking but I don't hear any recording. I'm using code compose studio version 7. what could be the problem?  I got jumpers connected on SPI DAC on BoosterPack plug-in module.

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CC1310: EOL capacitor alternatives

June 1, 2018, 1:59 pm
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Part Number:CC1310

Murata announced EOL on the follow capacitors, and possible other ones, that are used in the CC1310 reference design for the VDDS_DCDC and DCOUPL pin decoupling.

GRM188R71E104KA01D  - CAPACITOR, CERAMIC X7R, 100nF, 25V, -10%/+10%, -55DEGC/+125DEGC, 0603, SMD

GRM155R61A105KE15D - CAPACITOR, 0402 1UF 10VOLTS X5R 10%

I am concerned that there are specific requirements for these capacitors that may impact the operation of the 1310.

Are there TI approved alternatives for these?

Does GRM188R71E104KA01D need to be rated at 25V?

Does GRM155R61A105KE15D need to be 1uF?

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TINA/Spice/TPS22965-Q1: CAD model

June 1, 2018, 2:06 pm
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Part Number:TPS22965-Q1

Tool/software:TINA-TI or Spice Models

Hi Team,

My customer is requesting the CAD model for schematic and layout for the TPS22965-Q1. Ideally we would need the BXL file so that we can convert it to the appropriate file type via Ultra Librarian (my customer uses DxDesigner).

Please let me know if we have the model available, or when we could provide it to my customer or post it on the product page. 

Regards, Diego

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BQ28Z610: Cycle Count Update

June 1, 2018, 2:07 pm
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Part Number:BQ28Z610

Hello,

My question is about the cycle count parameter not incrementing. I am running a bq28z610 fuel gauge in 1S mode. I have fully charged a cell, passing through the cycle count percentage (which I have set to 90%), and discharged the cell below 90%. However, the cycle count does not increment. According to the TRM, the cycle count state is defined as follows in 13.6.10:

As previously stated, cycle count percentage has been set to 90%. I have passed through this threshold in both directions (charge/discharge) with no effect on the cycle count. Is there something else the cycle count is dependent upon that the fuel gauge is looking for?

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