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LSF0102: Pull up resistor size

July 18, 2019, 8:41 am
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Part Number: LSF0102

Hi Sirs,

Sorry to bother you.

We have use LSF0102 on Low pin count serial IRQ signal. (1.8v to 3.3v)

We couldn't got good waveform on A side and B side. 

The end customer have use 8.2K PU resistor that will in parallel to our B side PU resistor.

Our test table as below, did you any idea on here?

A

B

RAC carrier
Pull-high

LPC

220 ohm

1k ohm

8.2k ohm

High 2.4~3.3V
Low 820mV

220 ohm

1.5k ohm

8.2k ohm

High 2.4~3.3V
Low 620mV

150 ohm

1.5k ohm

8.2k ohm

High 2.3~3.3V
Low 440mV

100 ohm

1.5k ohm

8.2k ohm

High 2.4~3.2V
Low 400mV

100 ohm

1.3k ohm

8.2k ohm

High 2.3~3.2V
Low 400mV

100 ohm

820 ohm

8.2k ohm

High 2.5~3.2V
Low 540mV

100 ohm

200 ohm

8.2k ohm

High 3.3V
Low 1.5V

100 ohm

4.7k ohm

8.2k ohm

High 2.2 ~ 3.2V
Low 220mV

1k ohm

4.7k ohm

8.2k ohm

High 2.8 ~ 3.2V
Low 960mV

1.5k ohm

4.7k ohm

8.2k ohm

High 2.8 ~ 3.2V
Low 960mV

4.7k ohm

4.7k ohm

8.2k ohm

High 2.2 ~ 3.2V
Low 2.2V

4.7k ohm

8.2k ohm

8.2k ohm

High 2.1 ~ 3.2V
Low 2.1V

1k ohm

8.2k ohm

8.2k ohm

High 2.6 ~ 3.2V
Low 500mV

1k ohm

6.2k ohm

8.2k ohm

High 2.7 ~ 3.2V
Low 840mV

100 ohm

300 ohm

8.2k ohm

High 3~3.3V
Low 1.2V

100 ohm

390 ohm

8.2k ohm

High 3~3.3V
Low 1V

470 ohm

1k ohm

8.2k ohm

High 3~3.3V
Low 1.2V

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SN75DP159: Via Number and Location

July 18, 2019, 8:48 am
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Part Number: SN75DP159

Dear Team,

Could you please help to review below via number and location for my customer?

Each via could pass through about 0.8 A current.  

Please let me know if there is concern.

Thank you.

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WEBENCH® Tools/TIDA-00527: TIDA-00527

July 18, 2019, 8:48 am
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Part Number: TIDA-00527

Tool/software: WEBENCH® Design Tools

Dear Sir, I am trying to make this application more towards the hardware compatible. As I have to put manchester coding . I am trying to balance dc by sending a 1khz wave on the bus line. and if any data will be sent and change in dc line may detect the data. I have seen many modules which they majorly giving the hardware compatibility irrespective of the firmware. Can u help me in getting some better way for Dc balance?

Moreover i calculated the value for inductor and capacitor with my exact data signal rate. But it does not work fine.

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TMS320F28388D: Flash API compared to that of F2837x

July 18, 2019, 8:51 am
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Part Number: TMS320F28388D

Hello,

My customer is porting an F2837x design to F2838x, and they want to ship prototypes by year-end to their customer. These prototypes require the flash API (please see the private notes as to why).

This post refers to a customer who used the F2837x flash API to program an F2838x, but the TIer recommends to use the F2838x flash API and to wait for the next C2000Ware release, which are think is towards the end of the year. This is too late for my customer.

What would be the issue for my customer to use the F2837x flash API in F2838x prototypes?

Thank you.


Best regards,
François.

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TUSB211: Not working as expected

July 18, 2019, 8:58 am
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Part Number: TUSB211

Hello,

I've designed a PCB whose purpose is to redrive an USB2 HS signal. It is located at the front of a device.

The relevant parts of the schematic and routing are attached to this post. The USB traces are theoretically 90 ohms impedance matched.

The problem is:

First I've tried to test a very simple setup: the PCB with the TUSB211 is connected to a USB2 HS flash drive directly. There is about 1.5m of cable between the host and the PCB.

If I remove the power supply from the TUSB211, the USB flash drive works properly.

If I turn on the PSU, not matter what EQ level I select (and yes, I properly reset the chip each time I change this setting), the USB flash drive never enumerates.

I've tried with other devices, other cables, it is always worst with the TUSB211 turned on.

We do not own a very high speed oscilloscope nor the proper USB test fixture, so I can't measure the eye diagram.

Is something obvious missing?

Thanks in advance,

Victor

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CC2564MODx Certification needed

July 18, 2019, 9:01 am
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We developed a device using the CC2564MODx. We did not add any extra Hardware regarding communications and data transmission. 

Our doubt is that, we want to sell our device in some countries, and the certification company we usually work with told us that we have to perform Conducted testing and Radiated testing for some countries. We thought that this module was worldwide certified. Is it still needed to do some testing for certifications in other countries, even if the module is already certified in them? 

The fact is that the only thing we do for this testing is to connect a SMA antenna connector and run the Texas' test mode, which we think is already tested, and does not make sense to repeat the same test it in each country.

Thank you for your attention.

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TPS7A7300: guangyiw@ossia.com

July 18, 2019, 9:02 am
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Part Number: TPS7A7300

Dear TI Guru

I need to following few data from TI regarding TPS7A7300 Power Supply

1. Load Transient Response and its test conditions with graph

2. IBIS Model or Spice mode of this part

3. Any simulation tool on transient response for this part and simulation setup

Really appreciate your quick response

Thanks

Guangyi

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TAS5805M: what prerequisites exist for I2C register accesses and their effects?

July 18, 2019, 9:02 am
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Part Number: TAS5805M

There's a lot of uncertainty about the startup configuration of the TAS5805M: the datasheet doesn't give detailed information, and many people on this forum are - unsuccessfully - trying to get a basic startup configuration sequence, e.g. something that just puts the device in a state where all of the register set is configurable. I think providing this would be a great help to everyone. But so far it seems that there is no way to get such configuration, instead the PPC3-generated entire register space configuration setup has to be used.

Browsing the forum I have come across some undocumented (or not properly communicated) limitations, e.g. that the device reset via RESET_CTRL register can only be done in Output HiZ mode. The datasheet shows that the I2S must be active for startup configuration, but doesn't specify which subset of registers actually requires the I2S clocks to be present for writing them. This contradicts the example Linux codec driver as well, where the register initialization sequence is performed before I2S clocks are present. So what I would like to ask for is a specification of the boundary conditions that are necessary to read and write each register (or group of registers), and additional conditions when the written setting is actually applied. Preferably in a table format, such as:

Register (book, page, address) | Device states for I2C read | I2S clock for I2C read | Device states for I2C write| I2S clock for I2C write | Device states for setting activation | I2S clock for setting activation | Any other special conditions, if exist

Thanks in advance,

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AM3352: Connection to SGMII?

July 18, 2019, 9:04 am
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Part Number: AM3352

Is there a way to directly connect to SGMII, or is there another variant that will allow that?

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CC1310: Resetting the GP Timer in periodic up mode

July 18, 2019, 9:07 am
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Part Number: CC1310

I am using one of the GP timers in the CC1310 in periodic up mode to timeout if not reset by a hardware interrupt. This interrupt should occur every 20ms so the timer is set to overflow in 50ms.

When initialised and started;

    // Set periodic IR timer. Use GPT0B as PWM uses GPT0A
    GPTimerCC26XX_Params_init(&GPT_IR_params);
    GPT_IR_params.width          = GPT_CONFIG_16BIT;
    GPT_IR_params.mode           = GPT_MODE_PERIODIC_UP;
    GPT_IR_params.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;
    hIRTimer = GPTimerCC26XX_open(CC1310_BEAM_GPTIMER0B, &GPT_IR_params);

    // Set the timer to 50ms overflow (1/20 sec)
    GPTimerCC26XX_setLoadValue(hIRTimer, BEAM_IR_TIMER_VALUE);
    GPTimerCC26XX_registerInterrupt(hIRTimer, timerIRCallback, GPT_INT_TIMEOUT);

The timer starts and triggers the interrupt correctly when it times out.

Meanwhile the 20ms GPIO interrupt works and correctly calls a routine to reset the timer value;

void beam_reset_IR_timer (void)
{
    currentVal = GPTimerCC26XX_getValue(hIRTimer);
    GPTimerCC26XX_HWAttrs const *hwAttrs = hIRTimer->hwAttrs;
    HWREG(hwAttrs->baseAddr + GPT_O_TBV) = 0;
    currentVal = GPTimerCC26XX_getValue(hIRTimer);
    GPTimerCC26XX_setLoadValue(hIRTimer, BEAM_IR_TIMER_VALUE);
}

The two references to currentVal are simply for debugging. Sure enough the value in currentVal changes from somewhere around 54000 to around 30 during this routine but the timer still times out and triggers the timeout interrupt after 50ms.

Any ideas what I'm doing wrong here? The handles are correct and I have double checked the timer offsets.

Thanks

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Linux/BEAGLEBOARD-X15: Makefile find returns more than one result, build fails

July 18, 2019, 9:08 am
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Part Number: BEAGLEBOARD-X15

Tool/software: Linux

Hi everybody,

The top level Makefile is using the find command to change directories with wildcard searches.  Some of the example applications will return more than one result and the cd command will fail.  So the top level make fails.

To fix it...

  • gedit ~/ti-processor-sdk-linux-am57xx-evm-06.00.00.07/Makefile
  • ctrl-h
  • Replace "cd `find . -name" with "cd `find . -type d -name"
  • Replace all
  • save

...and the build succeeds.

Oh, and I'm running ubuntu 18.04.2.  Perhaps find returns only one result in 14 or 16.

Hope this helps someone someday.

Nathan

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TLV272: Check for damage

July 18, 2019, 9:15 am
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Part Number: TLV272

Dear all：

       I have operational amplifier TLV272 use question.

For example, I have two damaged TLV272 and one brand new TLV272.Can damage be detected by multimeter test without power on?
What are the causes of damage to the operational amplifier?

Thank you！

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LMR23625CFPEVM: Spike noise

July 18, 2019, 9:19 am
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Part Number: LMR23625CFPEVM

Hello team,

My customer has observed spike noise as following with LMR23625CFPEVM and I would like to know the cause of the noise.

No load: 40mVpp spike noise

1A load: 80mVpp spike noise

Also, the spike noise becomes bigger when placing one EVM very close to another EVM for those inductors to be very close. two EVMs are in SYNC operation.

They observed also spike noise level gets small when changed an inductor to be big size from small size, which means distance between LMR23625 and inductor becomes shorter.

Can I think the spike noise customer observed is due to EVM layout, especially distance between device and inductor?

or please suggest if there is any other reason?

Best regards,

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CC1312R: VDDR Sensor Power

July 18, 2019, 9:22 am
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Part Number: CC1312R

I am trying to integrate an AK09918C magnetometer. This chip runs at 1.65v-1.95v and I was hoping to power it directly from the VDDR pin, rather than through additional components. It is a pretty low power component and I am not actively using it during radio activity, so it "seems" reasonable to power it this way.

My question is: is VDDR a valid power source for an external component?

I'm having trouble soldering the tiny BGA, so I am just trying to figure out if its a connection issue or if my power scheme is the culprit.

Here's the datasheet on the AK09918C:

www.akm.com/.../AK09918C.pdf

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TPS61089: Question about the soft start application

July 18, 2019, 9:35 am
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Part Number: TPS61089

Hi team,

     My customer use TPS61089 device to convert 3.6V input to 11V output as below. And then disable the device, the body diode would be reverse blocking because output voltage is higher than input voltage. And after about a few hundred milliseconds, the output voltage would only drop to 10V because of the large capacitor and the device would be enabled again at this time. Is it ok for this application? This will happen periodically, is there any notice or error? Thanks a lot!

                       

Best Regards

Zhengquan Lu

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MSP430FR5994: LEA FFT implementation questions

July 18, 2019, 9:35 am
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Part Number: MSP430FR5994

Hello,

Can you please help me to answer the following questions below? 

1.       Does the FFT implemented in MSP430FR5994 require that the number of FFT points be a power of two? If not, does it automatically do zero-padding to make the number of samples submitted to the FFT algorithm to be a power of two?

2.       Where can we find a good example code for the FFT implementation for this processor?

Thank you!

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TPS65720: TPS65720 PSRR of LDO

July 18, 2019, 9:37 am
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Part Number: TPS65720

Hello,

I don't see a PSRR spec for the integrated LDO, we want to use this on a noise sensitive rail. Where can I find this spec?

Thanks,
Nick

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UCC27423: Inquire TI device to replace IR25603

July 18, 2019, 9:39 am
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Part Number: UCC27423

Hi Sir,

May I learn from you do we have any solution could replace IR25603 and has “Self-Oscillating”?

Thank you.

Edward Chen

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CC3220SF: Storing calibration data in flash

July 18, 2019, 9:40 am
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Part Number: CC3220SF

Hi ,

I want to store calibration data in EEPROM, but in my custom board (CC3220SF) i dont have EEPROM. Is it possible to store the data in on-chip flash?

(i.e) basically i want to understand whether i can use on-chip flash as an alternative for EEPROM.

Regards,

Black.

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TPS65000-Q1: ASIL-B

July 18, 2019, 9:43 am
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Part Number: TPS65000-Q1

Hello, may I know TPS65000-Q1's next generation PMIC P/N (ASIL-B compliant)? I saw the introduction from web seminar, but I can't find the data from ti.com. Thanks! 

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