SN74LVC16245A: SN74LVC16245A with a floating input pin

April 2, 2019, 5:52 am

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Part Number:SN74LVC16245A

Hello

I have read the SCBA004D application note and noticed the SN74LVC16245A XCVR as part of the WideBus family has the Bus-Hold feature.

I understood from your appnote that in case the input was once being driven by a "0" or "1" there is no over current/ heating problem when this driver

starts to float (last input level is being kept by the XCVR until next change).

However, what is the situation when the XCVR is being powered up where there is no driver available at one of the XCVR pins (such in case a JTAG connector is connected

to the Buffer pins , but during power up there is nothing connected over this JTAG connector...)

Will the XCVR pin  float until JTAG machine is connected to the connector and starts driving "0"/ "1" ?

If so, can it harm the XCVR?

Thanks

Amnon

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DS90UB954-Q1EVM: DS90UB954-Q1EVM

April 2, 2019, 5:55 am

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Part Number:DS90UB954-Q1EVM

Hello TI,

I am struggling to display the MIPI CSI-2 image from the 954-Q1EVM / 953-EVM kits. After probing, I do not see the reference clock 25 MHz active from your 954-Q1EVM. How do I make the Ref CLK active? I am sending the POC voltages and the Pass and Lock LED's are lit on the 954-Q1EVM. 

I am using a Cypress CX3 Denebola RDK eval board with a custom adapter board to link the differential CSI data lines, CLK lines, and I2C lines between the CX3 and your 954-Q1EVM. 

Below is my status after running the following Python scripts ( 954_script_A1_RX0_init_CSI0_broadcast.py    and    ovt_1280_1080_30fps_REMOTE_RevE2_ID7a.py). Please help provide any additional Python code I need to run to ensure the link is proper. Can you send me the Python Scripts to my email?  emilio.cuesta@te.com

My concerns are listed below:

-REF CLK not seen from the J24 connector 

- "Current CSI TX Status" Port 0 Sync Status shows "No" , but the Pass Status displays "Pass". Maybe the REF CLK not being seen can be a cause.  

Thank you for your assistance!

  

RTOS/CC1350: Task_Object_first() returning NULL handle

April 2, 2019, 5:57 am

≫ Next: MSP430FR6879: MPU

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Part Number:CC1350

Tool/software: TI-RTOS

I am attempting to check that not tasks have failed in isolation and which may not be caught by my watchdog, so I have added some checks in the clock callback which clears the WDT.

void clearWatchdogClockCallback(UArg arg0)
{
    /* Check that no single task has failed in isolation */
    uint8_t i, terminatedTasks;
    Task_Handle task;
    Task_Stat taskStat;
    String name;

    // Get the task handle
    task = Task_Object_first();

    // Check task status and get another
    while(task){
        Task_stat(task, &taskStat);
        name = Task_Handle_name(task);
        // Check if the task has been terminated
        if(taskStat.mode == Task_Mode_TERMINATED){
            terminatedTasks++;
            break;
        }else{
            task = Task_Object_next(task);
        }
    }

    ...
}

However, I am not getting any of my 4 dynamically created task handle/objects returned from the Task_Object_first(), it's returning NULL.

What it going on here?

MSP430FR6879: MPU

April 2, 2019, 6:02 am

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Part Number:MSP430FR6879

Hi

Please tell me MPU function for MSP430FR6879.

MPU tab like following figure, and it shows "W" is unchecked.
It will mean write protection.

1.
If program is downloaded with write protection, that means this segments(start address to end address)
is never overwritten by software. Is my understanding correct?

2.
If the segment with write protection includes firmware update (OTA) data, it would be never updated
because that memory range is write protected. Is my understanding correct?

3.
Could it be possible to accress to segments with wirte protection using external tool like JTAG?

BestRegards

CC8531: CC8531

April 2, 2019, 6:05 am

≫ Next: TINA/Spice/TPS62740: The 4-bit pattern generator fails when 'start display' is set 'long' & It would be great to have a 'trigger' input to the generator, to allow it to start synchronously to a device...

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Part Number:CC8531

Hi all,

I am using PurePath Wireless CC8531,

My issue is:

How a slave should pair without pressing any button on slave or master?

Regards,

Damla

PS: I found a related question but the files were gone, don't know how to reach them but any help will be best. And here is the related questions link:

https://e2e.ti.com/support/wireless-connectivity/other-wireless/f/667/t/707771?CC8531-Pure-path-Wireless-auto-pair-and-auto-switch-feature

TINA/Spice/TPS62740: The 4-bit pattern generator fails when 'start display' is set 'long' & It would be great to have a 'trigger' input to the generator, to allow it to start synchronously to a device...

April 2, 2019, 6:06 am

≫ Next: ADS7841-Q1: BUSY pin function

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Part Number:TPS62740

Tool/software:TINA-TI or Spice Models

I have a 4-bit pattern generator running a sequence, 'repeat pattern' to drive the VSEL pins on TPS62740... If I start the simulation display at close to 0 time, the generator runs continuously, as expected.  If, however, I set the simulation to start display at 10 ms, after the start-up delay of the TPS62740, the pattern generator does not run, the outputs seem to be 'floating'.

It is also a waste of simulator cycles to have this generator running continuously, when I really want it to start after the DC/DC is finished start-up.  Two functions would be great:

1) a 'hardware trigger' input

2) a start running time.

ADS7841-Q1: BUSY pin function

April 2, 2019, 6:07 am

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≪ Previous: TINA/Spice/TPS62740: The 4-bit pattern generator fails when 'start display' is set 'long' & It would be great to have a 'trigger' input to the generator, to allow it to start synchronously to a device...

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Part Number:ADS7841-Q1

Hi,

Can you explain more about the BUSY pin function of ADS7841-Q1? And how to utilize this signal?

Is it a must-have for SPI communication? As the MCU only support 4-wire SPI interface and there's no additional pin for BUSY signal, can I just leave this pin float?

Many thanks.

BR,

Brian Zhao

OPT8320: People counter build

April 2, 2019, 6:09 am

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Part Number:OPT8320

Before I start, i am a complete beginner in this field so I apologize if I have missed anything simple.

I want to build a people counter that is able to record the number on board of the sensor. I was the data to be recorded and sent live over wireless or a LAN connection to a data base.

Am I selecting the Correct sensor for this application? 

If i was to use a basic TOF sensor what other components would I need for it to record on board and send the data to a remote location?

Can this sensor be used in such a way as I have described above.

Hoping someone can help,

A

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TPS25982: UL recognition?

April 2, 2019, 6:15 am

≫ Next: TMDSIDK437X: TMDSIDK437X Real Time Clock needed for Ehtercat / Profinet?

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Part Number:TPS25982

The parametric data table for the TPS25982 says it's UL recognised, but there's no mention of this in the datasheet. I appreciate this is a new part, but is there any confirmation that it is / will be UL approved

TMDSIDK437X: TMDSIDK437X Real Time Clock needed for Ehtercat / Profinet?

April 2, 2019, 6:21 am

≫ Next: TPS92661-Q1: One LED of 12 is flickering

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Part Number:TMDSIDK437X

Dear all,

I would like to trim down the TMDSIDK437X schemtics to use it for Profinet, Profibus, and Ethercat Communication. For the sake of simplicity, I would also like to replace the power supply as suggested in application note slvuab1a. This also implies that I would not implement the real time clock. Now, my question is: Is the real time clock needed for the operation of Profinet, Profibus, and Ethercat? If not, what is it needed for? Or how would I find out if I am (accidentally) using it.

Many thanks,

Christian

TPS92661-Q1: One LED of 12 is flickering

April 2, 2019, 6:21 am

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Part Number:TPS92661-Q1

Dear TI Support,

our company develops electronics for LED luminaires. We use a lot of TI chips.

We encountered a problem with the matrix controller TPS92661-Q1 on our aluminium-core light engines: The lowest LED of the string (on negative/GND input of the current source, between pin 36 and 37) of 12 LEDs is flickering - in a way which normally cannot be programmed. This means, in some of the periods the controller turns on the lowest LED for a short time (shorter than one clock pulse).

The phenomenon exists not on all layout versions – however these light engine layouts are pretty similar. It depends clearly on if the aluminium core is connected to GND or not. If the core is floating, no flickering occurs. (Due to EMC reasons the alu cores of the light engines must be connected together and to GND.) We already measured the control signals, these are OK. As I wrote above, the ON-pulse is so short, this cannot be programmed for that length. Maybe it is a bootstrap issue. (Increasing the capacitor value doesn’t solved the problem.)

At the pictures You can see two periods which should look identical, but they are different. The one LED is turned on, where it should remain off.

The next picture shows the Vf of one LED (the lowest in the string).
The cursors marking one period. This means, the controller turns the LED in some periods two times on! (Programmable: only one time.)

Of course, we could provide You our light engines to test them – we think this would be the fastest way to find out what causes the flickering. (I may not post the layouts here.)

Many thank in advance for Your response!

Peter H.

AM6548: ICSSG Accelerated Data Movement

April 2, 2019, 6:26 am

≫ Next: LMR16030: Maximum Allowed Value of Soft-Start Capacitor

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Part Number:AM6548

Hi,

I try to test different ways of how to move data from ICSSG to MSMC. To be more specific, I would like to move data from ICSSG0 Data RAM0 (local adress 0x0) to MSMC DDRAM (0x8000 0000).

For now I used the memcpy.asm function, which calls the SBBO instruction. Depending on the blocksize of the data to transfer, I get transfer rates from 30 MB/s to 270 MB/s.

Q1: I assume this instruction (SBBO) use the NAVPSS PSI-L  (See Figure 6-111. PRU_ICSSG Integration). Is this correct?

Q2: Would CBASS0 Interconnect provide a higher transfer rate to MSMC DDR?

Reading 6.4.5.2.3.1 I suppose Q2 is true, therefore:

Q3: Which modules/subsystems are involved to move data from ICSSG Data RAM0 to MSMC DDR via CBASS0 Interconnect?
Which instances do I have to configure properly to get it work?
Is there any (example) code/driver/csl functionality which helps me to get this working?

I just need to get a starting point. I've read Chapter 10 (DMA) briefly but have not yet gained the knowledge to know what to do to establish this data transfer path from ICSSG to MSMC.

Best regards,

Thomas

LMR16030: Maximum Allowed Value of Soft-Start Capacitor

April 2, 2019, 6:29 am

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Part Number:LMR16030

Hi, Team

My communication customer is plan to use LMR16030 in their RCU of smart antenna. They need very long soft-start time. Could you share what is the Maximum Allowed Value of Soft-Start Capacitor?

Thanks

Kevin

TMS570LC4357: Does XDS560 v2 Pro trace work on Hercules TMS570LC43x?

April 2, 2019, 6:30 am

≫ Next: TPS65987D: Boot Mode Pin Strapping

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Part Number:TMS570LC4357

Hi,

I was thinking to buy a JTAG XDS560v2 Pro trace for programming and debugging Hercules TMS570LC43x devices. However, I am not certain, if this JTAG suport Hercules TMS570LC43x. Could you kindly confirm, Does this particular JTAG support Hercules TMS570x series ?

Thanks in advance.

Best regards,

Farrukh

TPS65987D: Boot Mode Pin Strapping

April 2, 2019, 6:31 am

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Part Number:TPS65987D

Hi Team,

I would like to ask two questions about Boot Mode Pin Strapping.

1)
I believe "Device Configuration" in Table 5 indicates the device configuration after boot if SPI flash isn't connected to TPS65987D.
Is my understanding correct?




2)
There is "(Internal Switch)" or "(External Switch)" in Table 7.
 "Configuration 5" shows "(External Switch)" and I believe it indicates External Switch is used for sink path.
Is my understanding correct?



Best Regards,
Yaita

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DRV8701: DRV8701P Affect output current capability factors

April 2, 2019, 6:34 am

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Part Number:DRV8701

Dear :

Setting: the frequency=20K,  Rsense=0.01Ω  Vref=2V
So Ichop=2v/20k*0.01=10A.  Rdriver=100K  connect to AVDD.

 I found  when Duty=50%,  I block the motor, and the output current reach 5~6A ,The motor will easily stop .
change the duty to 100%,  I block the motor , the motor will not be easily stop.
Actually, I hope the output current can reach 10A, even the duty reach to 50%, so i think, there maybe something wrong on the sch.
Pls help to confirm this ,thanks

TMDSIDK437X: TMDSIDK437X - Using one 1G RAM instead of two 512 MB RAMs?

April 2, 2019, 6:35 am

≫ Next: BQ24650: Charging Current does not hold constant during Constant Current mode

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Part Number:TMDSIDK437X

Dear all,

I would like to trim down the TMDSIDK437X schematics to use it for Profinet, Profibus, and Ethercat Communication. In the schematic on page 6. there are two 512 MB RAMs depicted. Should I also use two RAMs for my design or is one 1GB RAM sufficient? I am just trying to understand the motivation behind using two RAMs.

Many thanks for your input!

BQ24650: Charging Current does not hold constant during Constant Current mode

April 2, 2019, 6:45 am

≫ Next: LMX2594EVM: Register Values

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Part Number:BQ24650

I'm working with the bq24650 in order to charge a 12V 9AH Lead Acid battery.  I have designed my circuit according to the SLVA237A app note and the part datasheet.  Some design points are as follows:

• Vinput = 15.6V
• VMPPSET = 13.33V 
  • R17 = 364 kOhm and R19 = 36 kOhm (R17 and R19 are based off app note)
• Vblk = 14.7V
• Rsr = 0.04Ohm
• 1A charge current
• Vrech = 13.8V

Note: this design does support temperature compensation.

I'm attaching an oscope measurement taken during the charge cycle.  The blue is the charge current,  the yellow line is Vcc, and purple is SRN. 

I've drained a battery down to about 10.6V and have connected it to the charger. The charger will apply about 970mA of current, but this amount will decrease slowly over the course of the charge.  Note I am measuring this current across the sense resistor.  The current starts to decrease once the battery is around 11.8-12.2V, not at the expected Vblk amount, where the current should rapidly decrease.  I've spoken to several TI employees on this already, but none could give me an explanation so far, so I'm hoping to get help here.

Thanks for your help.

LMX2594EVM: Register Values

April 2, 2019, 6:46 am

≫ Next: RTOS/CC2642R: disconnection continues to happen with the reason(0x08) when connection interval with 100ms and slave latency with 50 are being used over 1Mbps PHY only condition

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Part Number:LMX2594EVM

Hi,

I have questions regarding register values for register 0 and 25 in the LMX2594 and wonder if you can help?

In register 0, D3 is responsible for FCAL_EN, should this be toggled (0 - 1 - 0) if so how long should it be high for, or can it be left as 1?

Regarding register 25, revision B of the data sheet shows that D11 = 0, D9 = 1, D3 = 0, D2 = 1, D1 = 0 and D0 = 1 - these appear to be fixed values and not responsible for any user defined functions. However, if I download the hex file from the evaluation board using TICS Pro all of these values are inverted. Which of these settings are correct?

I ask because we have problems with very high phase noise and wonder if one of these register settings could be a contributing factor?

Many thanks for any help you can offer,

Best regards

Keith

RTOS/CC2642R: disconnection continues to happen with the reason(0x08) when connection interval with 100ms and slave latency with 50 are being used over 1Mbps PHY only condition

April 2, 2019, 6:47 am

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Part Number:CC2642R

Tool/software: TI-RTOS

Hi TI experts,

My SW is based on TI SDK simplelink_cc26x2_sdk_2_20_00_36 and POWER_SAVING mode is on.

Disconnection continues to happen with the reason(0x08) even though 16 seconds or 32 seconds are assigned for supervision timeout when connection interval with 100ms and slave latency with 50 are being used over 1Mbps PHY only condition.

But no issue at all when the same conditions are over 125kbps PHY only condition.

Regards,

Ji-won