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ADS1118: Interrupt too soon, noisy, shifted levels

September 27, 2018, 9:27 pm
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Part Number:ADS1118

Hello, I have a board that has 3 ADS1118s and 1 gyroscope (LSM6DSM) connecting to my MSP430F5529 microcontroller.  The gyroscope's CSB is tied high all the time because I'm not talking to it at the moment.  

However, the 3 ADS1118s are showing the following issues:

  1. DOUT_DRDYB occasionally doesn't get pulled down to 0V nor pulled up to 3.3V; I'm seeing this issue with ADC1 & ADC3 but not ADC2.  I have a feeling there might be a bus contention somewhere, and I even checked to make sure none of the other CSBs are asserted when it's not supposed to. 
  2. The DOUT_DRDYB signal is really noisy.  I tried switching scope probes and the noisiness just follows the signal.  I think this might be a board layout issue but not quite sure.
  3. DOUT_DRDYB is low even when all the CSBs are high.  This is an odd phenomenon because when all the CSBs are high, none of the slave should be controlling the bus, and all the ADS1118s have a weak internal pull-up so DOUT_DRDYB should be pulled high when CSB is high.  My microcontroller interprets this as an "Interrupt Too Soon" error. Of all 27 ADCs on 9 different boards that I saw, maybe half of the ADCs occasionally have this issue. 

I've attached a scope shot of ADC3, which exhibits all 3 of these issues.

I want to know if there's anything I can do to troubleshoot.  I'm thinking of removing the gyroscope, then retest, and slowly removing each slave and just testing one slave at a time to make sure there's no bus contention. 

I set each ADS1118's LSB = 0xEB and MSB = 0x8F.

Thanks in advanced. 

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TPS543C20: SYNC PIN setting question

September 27, 2018, 9:27 pm
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Part Number:TPS543C20

Dear Sir 

If I set the TPS543C20 to stand-alone mode, does the SYNC PIN output a PWM signal?

below is my setting for you reference.

Allen

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DRV8872: Driver current issue

September 27, 2018, 9:32 pm
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Part Number:DRV8872

  In our design, the Drv8872 is used to drive the brush motor of the Parking E-lock.

  The Power of DRV8872 is provided  by a lead-acid battery, of which the standard battery nominal votage is 12V.The VM pin is coupled with a 100nF Multilayer Ceramic Capacitor  and a Y5V 47uF/16V Multilayer Ceramic Capacitor. 
  The 12V then is buckeddown to 4V then 3.3V for the system. The fault pin is pulled up to 3.3V through a 30K resistor.

  We have encountered 3 cases when testing the electric board.The phenomenon is as described as below.

  When the battery is plugged in or the 12V power is switched on, the VM part of the DRV8872 got burned!!!
   
  The part of schematic and PCB document is as below. And the highlited path is the  power line to VM PIN of DRV8872.
   
  Please give some advice for our use of DRV8872.

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BQ24105: 3cell battery charger

September 27, 2018, 9:43 pm
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Part Number:BQ24105

Hi all.

I'd like to ask you about a problem when charging.

basically, when the target chaging voltage is reached, the charging current is gradully reduced as in DS figure 3.

however, likt the attached waveform, the charging current remains intact as the BAT voltage becomes 0V.

(ch. 1 : Bat pin voltage, ch.4 : charging current)

As shown in C3 of EVM, we added a capacitor to verify normal operation.

I would like to know the reasons for the improvement by adding C3.

Thanks.

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TLV320AIC1106: TLV320AIC1106 select LINSEL Pull high, no sound issue

September 27, 2018, 10:05 pm
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Part Number:TLV320AIC1106

Dear,


our client design TLV320AIC1106 with MC8090( 3G Modle) was can work and sound  was normal , but MC8090 was EOL.


so We change Air prime  WP8548( 3G Modle) linear mode  Audio sound was no clearn have backgounf noise, select 8 bit u-law mode was no sound.

have any suggestion other Audio code with  the same TLV320AIC1106 spec, but can support 16 bit linear.

schematic:

(Please visit the site to view this file)

If any, Please advise me.


Thanks,


Best regards,


Lawrence.

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Linux/DRA72XEVM: Yocto build Failure

September 27, 2018, 10:07 pm
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Part Number:DRA72XEVM

Tool/software: Linux

Dear Team,

We are building SDK by referring the following site,

http://processors.wiki.ti.com/index.php/Processor_SDK_Linux_Automotive_Software_Developers_Guide#Building_Yocto_Filesystem

We are getting the following errors.

1) ERROR: ti-llvm3.6-3.6-r5 do_compile: oe_runmake failed

2) recipe boost-native-1.60.0-r0: task do_compile: Failed

Attached is the build log. (Please visit the site to view this file)

Please suggest how to resolve this.

Regards,

Pallavi Ghorpade

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CC3220SF-LAUNCHXL: CC3220SF: Uniflash file size

September 27, 2018, 10:09 pm
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Part Number:CC3220SF-LAUNCHXL

   

      I am trying to dump code but i am getting error 

      i am using CC3220SF-LAUNCHXL board here 32mb flash is there why i am getting error ?

      when i add web page(css,images,js,html) code that time showing error ?

     any size limit is there ?

     How to solve this issue ?

 

Thank you

  Vasu

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OMAPL137-HT: Relationship between Power sequence and EMIF

September 27, 2018, 10:19 pm
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Part Number:OMAPL137-HT

Hi, All

I have two types of board with OMAPL137. One of the two types, is designed without "Power-on sequence."
At first both types were fully functional but, few monthes later, one without the "Power-on sequence" had a common problem.
Communicating with SDRAM failed and I think EMIFB_CLK is the main cause, could there be other cause?
Does not keeping the boot sequence cause similar problems? Like LATCH-UP?

* EMIFB_Clock

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RTOS/AM5728: importing vps into ccs

September 27, 2018, 10:21 pm
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Part Number:AM5728

Tool/software: TI-RTOS

hi,

I am trying to import a example project of vps from the path /ti/pdk_/pacakges/examples . it shows the following error. please guide me how to resolve it. i am using am5728evm and camera module provided by ti m9t11 . I am trying to capture video using that camera connected to vip port. I am using ccs8 compiler and rtos linux sdk.

thanks and regards,

K Subrahmaniam

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ADS1248: Absolute Maximum Ratings of analog input voltage

September 27, 2018, 10:21 pm
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Part Number:ADS1248

Hi,

Let me ask you a question about absolute max voltage of analog input.

1) Device failure mode

In case of inputting over voltage from absolute max voltage (AVSS-0.3V/AVDD+0.3V) to analog input,

probably internal protection diode will be "ON" and a lot of current flush in/out to ADS1248.

As a result, the device will be damaged due to the current.

Is this correct?

If yes, the device will not be damaged in case of using a register to restrict the amount of the current.

Do you have any other failure mode without the resh current?

2) How much current can do damage the device?

Will you tell me how much current can do damage the device?

If we know the amount of current, we can prepare the register to restrict the current.

On the other hand, how about input voltage level?

I suppose though over abosolute max voltage is inputted to analog pin, the device will not be damaged due to the current protection register.

3) Internal protection diode

This is my basic question,

even though internal protection diode is broken by the rush current, the other circuit will not be damaged, I suppose...

Because the protection diode is installed inside to protect the device.

What do you think of my idea?

4) Actual voltage

Will you tell me the actual value of absolute max voltage of the analog input pin?

And how long time can we add the voltage to the device? for example, 10nSec??

Thank you so much for your support!

Best Regards,

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SN74AUC1G17: VOH/VOL @ 1.8Vcc

September 27, 2018, 10:22 pm
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Part Number:SN74AUC1G17

Hi Team ,

Our customer is doing logic compatibility analysis for SN74AUC1G17.

Vcc is 1.8V

Customer need the VOH and VOL values for this part for 1.8V vcc, in datasheet the VOH and VOL values is not provided for
1.8V vcc. Plaese help with the same.

Thanks in advance for your help and support.

Regards, Shinu Mathew.

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BQ51050B: How to selection R (FOD), R(term), R (ILIM), R(RECT).

September 27, 2018, 10:24 pm
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Part Number:BQ51050B

as Reference data:  tidraz7.pdf and data sheet(8.3.4.3 Battery Charge Current Setting Calculation)

It is too complex on spec description on selection R (FOD), R(term), R (ILIM), R(RECT). Can you calculate it for me?

My operation is Li-Pol Battery (100mAH, 50mA charge, 20mA discharge), system operation using 5mA.

(Please visit the site to view this file)(Please visit the site to view this file)

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TIDA-00890: Schematic information

September 27, 2018, 10:28 pm
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Part Number:TIDA-00890

Hello support team,

My customer is also requesting us to see a schematic diagram for the TIDA-00890 since they would like to refer a connection between USB type-A to type-C.

PLEASE PROVIDE PDF FILE FOR THE TIDA-00890 SCHEMATIC.

Cadence viewer software installation is a complicated and there is PC security violation issue in some user case.

Regards,
Kaizawa

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TMS320F28069: Peak current mode control with F28069 by using DCAEVT2/DCBEVT2 and TZA/TZB

September 27, 2018, 10:29 pm
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Part Number:TMS320F28069

I have designed a micro controller with F28069. I have used EPwm3 A and B to drive two power stages independently. Each power stage has been designed to drive with peak current mode cycle-by-cycle controller, using comparators 1 and 2 on F28069. The cycle-by-cycle mechanism has been implemented through DCAEVT2/DCBEVT2 and set TZA/TZB to pull EPwm3A and EPwm3B low. The question is that I can't make them work independently. When DCAEVT2 and TZA has been triggered, it will not only pull EPwm3A low but also pull EPwm3B low. Is there any way to let them work independently? Note: I have to use EPwm3A/B. Can't use EPwm3A or EPwm4A instead. The code is like these:

    Comp2Regs.DACCTL.bit.DACSOURCE = 0;         // Inverting input of comparator connected to internal DAC
    Comp2Regs.COMPCTL.bit.COMPDACEN = 1;    

    Comp1Regs.DACCTL.bit.DACSOURCE = 0;         // Inverting input of comparator connected to internal DAC
    Comp1Regs.COMPCTL.bit.COMPDACEN = 1;    

    EPwm3Regs.DCTRIPSEL.bit.DCALCOMPSEL = 9;      // DCAL = Comparator 2 output
    EPwm3Regs.DCTRIPSEL.bit.DCBLCOMPSEL = 8;      // DCBL = Comparator 1 output

    EPwm3Regs.TZDCSEL.bit.DCAEVT2 = 3;                    // DCAL = low, DCAH = don't care
    EPwm3Regs.TZDCSEL.bit.DCBEVT2 = 3;                    // DCBL = low, DCBH = don't care

    EPwm3Regs.DCACTL.bit.EVT2SRCSEL = 0;               // DCAEVT2 = DCAEVT2 (not filtered)
    EPwm3Regs.DCBCTL.bit.EVT2SRCSEL = 0;               // DCBEVT2 = DCBEVT2 (not filtered)

    EPwm3Regs.DCACTL.bit.EVT2FRCSYNCSEL = 1;          // Take asynchronous path
    EPwm3Regs.DCBCTL.bit.EVT2FRCSYNCSEL = 1;          // Take asynchronous path

    EPwm3Regs.TZCTL.bit.TZA = 2;
    EPwm3Regs.TZCTL.bit.TZB = 2;

    EPwm3Regs.TZCTL.bit.DCAEVT2 = 2;                            //  Digital Compare Output A Event 2 Action On EPWMxA: Force EPWMxA to a low state.
    EPwm3Regs.TZCTL.bit.DCBEVT2 = 2;                            //  Digital Compare Output B Event 2 Action On EPWMxB: Force EPWMxB to a low state.

    EPwm3Regs.TZCTL.bit.DCAEVT1 = 3;                            // do nothing
    EPwm3Regs.TZCTL.bit.DCBEVT1 = 3;                            // do nothing

    EPwm3Regs.TZSEL.bit.DCAEVT2 = 1;                            //  Enable DCAEVT2 as a CBC trip source for this ePWM module
    EPwm3Regs.TZSEL.bit.DCBEVT2 = 1;                            //  Enable DCBEVT2 as a CBC trip source for this ePWM module

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TPS51367: About variation of operating frequency

September 27, 2018, 10:31 pm
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Part Number:TPS51367

Hi,

I have created a circuit using the TPS51367 device.
Now I am checking the operation of the circuit, but there is concern that the operation of TPS51367 will affect other devices.
It is mainly concerning operating frequency.
I understand that TPS51367 performs DCAP2 control, so the operating frequency varies to some extent.
We know that the operating frequency is not regulated by electrical characteristics.
Still, I would like to check the variation in operating frequency and the temperature characteristics.
Can you tell me how much variation in operating frequency is assumed in my specification over the whole temperature range? There is no need to guarantee this.

(specification)
Input voltage: 6 V to 9 V
Output voltage: 1.0 V
Output current: 1.5 A to 3.5 A
MODE pin: GND connection (fsw = 400 kHz)

Best regards,

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TMDSHVMTRINSPIN: With TMDSHVMTRINSPIN kit, After loading the motor ware lab exercise file 01b, I am unable to observe the PWMDAC outputs.

September 27, 2018, 10:33 pm
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Part Number:TMDSHVMTRINSPIN

I struggled with getting the output as shown in the motorware lab manual on the DSO as well in the CCS graph from Datalogger.  

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TPSM84A21: ROHS

September 27, 2018, 10:39 pm
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Part Number:TPSM84A21

Dear TI Expert,

I  found the TPSM84A21 is under in-work status for RoHS

Could you suggest when will it can pass RoHS?

Thanks.

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BQ28Z610: difference between FW V0.20 and FW0.17

September 27, 2018, 10:44 pm
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Part Number:BQ28Z610

Dear TI Experts,

There are 2 firmware verison of BQ28z610 on Ti website as below picture. May I know the main difference between them? Is there a chagelist for it? Thanks a lot.

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BQ28Z610: HW setup of BQ28Z610 for 2S Li cell

September 27, 2018, 10:45 pm
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Part Number:BQ28Z610

Hello,

I have a question regarding to the wiring of the BQ28Z610. The fuel gauge shall be implemented on our system main board for fuel gauging  only. The protection function is not needed.  We would like to use a standard lithium battery pack having 2 in series connected rechargeable batteries including a protection circuit, however the middle connection of the first cell /4.2V) is not wired out of the pack to the connector.

Is it possible to use the BQ28Z610 as fuel gauge only?

How do I have to wire the VC1 and VC2 pin?

Thank you for your support,

regards sb

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ADS1298ECGFE-PDK: price of the part mentioned.

September 27, 2018, 10:50 pm
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Part Number:ADS1298ECGFE-PDK

i only want the ADS 1298 ECG evaluation board and later communicate using SPI to some other dsp. Can i get only the evaluation board and not the MMB0 board. Also specify me with the price of only the evaluation board and the power adapter

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