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TPA3112D1: Fault Shutdown, not restarting

March 16, 2018, 7:22 am
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Part Number:TPA3112D1

Hello Team,

Posting on behalf of customer.  Please note that this circuit, minus the snubbers, has been used on two other products with no issues.

Thanks,

Keith N.
AFA OH/wPA

This Class D audio circuit has been in use here for quite some time, and as far as I knew, there was no problem with it.  I used the same circuit on our newer product, but changed the output circuit to put ferrites as close as possible to the IC’s outputs.  I also didn’t have the snubber circuits shown below.  My concern was EMI.  150 built and tested boards and nobody has seen a failure.

Image may be NSFW.
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We are rolling out a new project, and 1 in 85 controls is failing for audio.  They work in the test and calibration stages of setup.  Then at the final step, I think the audio is a bit louder, they quit working.  No more audio.  Not until power cycled.  I have checked that audio is still present on the input.

The /FAULT pin goes low and stays low.  I know the auto-retry is supposed to work…. When the fault pin goes low, it shuts the amp down (outputs stop PWM output immediately) but it doesn’t come out of shutdown.  The pullup (R35 in this case) is 100K.  Tried dropping to 1K… The voltage goes goes up a bit but does not restart.

I checked the 12V supply at the time of the fault (+/- a few hundred microseconds).  There is no transient on the 12V line that could cause the chip to go into a funky mode of operation.  I removed the snubber circuits from the design.  No change.  However, I noted that the output lines transient up to 19V with the loudspeaker connected.

After trying different measurements for a hour or so, the chip started failing more easily… before the final place in the test sequence that used to make them fail.  This tells me that the chip is being damaged by the transients since it is failing more easily after so many events.

Is there anything that you can suggest, using the same circuit topology to fix this problem?

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BQ25703AEVM-732: read backs and stop charging

March 16, 2018, 7:24 am
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Part Number:BQ25703AEVM-732

Hi,

I had a few questions about the BQ25703A with BQstudio. Everything seems to work like a charm, but the registers with the read back values do not give the right values i believe.

Charge and Discharge current: 0x28 = 0000, while i can measure the charge current on the battery line
Input Current 0x2A (I think this is the input current from the adapter?) = 0000 can also measure differnt values there
System and Battery voltage 0x2C = 0000, same story

The VBUS voltage 0x26 is correct.

Besides these problems I was wondering when the charger will stop charging. I can see the current getting lower and lower, but... Or is it because there is no read back that it will never stop.

Thanks again.

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LM48511: National Semiconductor Version vs TI Version

March 16, 2018, 7:26 am
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Part Number:LM48511

Are there different revisions of the IC out there since this parts inception?  Going back to when National Semiconductor manufactured this part, has the part remain function, fit and form equivalent?

There have been revisions in the datasheet since that time (in particular referring to FB_GND0 and FB_GND1 pinout and I'd like to ensure that these are:

1) solely documentation changes

2) there have been no changes to the pinout and function of the IC

Regards,

-Chris

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ADS1258: Can Delta-Sigma ADC EvaluaTIon Software be used for ADS1258 evaluation?

March 16, 2018, 7:33 am
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Part Number:ADS1258

Hi,

can the Delta-Sigma ADC EvaluaTIon Software be used for ADS1258 evaluation also?

This SW is supposed to be run on 'modern' OSs - like Windows10, 

unlike the "ADCpro" SW which is heavily outdated, which is why I need to know this.

-Thanks

Rgds

Morten Larsen

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CC1312R: Forced Mass Erase with dbgjtag.exe

March 16, 2018, 6:51 am
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Hi,

sorry for waking this solved thread from the dead, but this thread is the closest I've come to solving my problem.

I'm working with a cc1312r1 Launchpad, which I have flashed with a binary that locks all debug interfaces (ie serial bootloader, jtag, etc) through CCFG configuration. This works as intended on cc1310, cc1350 etc, I just have to do a forced mass erase in SmartRF Flasher2 when I want to reflash it.

Now, SmartRF Flasher2 doesn't support CC1312r1 yet. And uniflash and all other tools I've tried doesn't do forced mass erase - it just reports the error"IcePick_C: Error connecting to the target: (Error -241 @ 0x0) A router subpath could not be accessed. A security error has probably occurred. Make sure your device is unlocked. (Emulation package 7.0.100.0)".

Thus, dbgjtag seems like the only resort I have to perform a forced mass erase of my device, but I can't find the proper settings.

Which leads to the question - what is the arguments necessary to perform a forced mass erase of the cc1312r1 with dbgjtag.exe?

I have plenty of SmartRF06EBK and other Launchpads etc so can plug any of them in. For example, I disconnect all jumpers on the cc1312 and a cc1310 and hook them up with the 10-pin 1.27mm JTAG cable, but still no dice. Can't force mass erase.

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PCM1862-Q1: Design issue of a audio card for pine64

March 16, 2018, 7:11 am
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Part Number:PCM1862-Q1

Hello.

I am trying to desing a audio card to use with pine64 ( www.pine64.org/

I am thinking to use  PCM1862-Q1 IC(www.ti.com/.../pcm1865-q1.pdf schematic on page 23). 

I will give audio data (a mixer output) to this IC and connect the IC to the pine 64 board via IS2 pins (XO-BUF, SCKI, LRCK, BCK, DIN, DOUT).

Then I will broadcast this audio on internet using pine64. 

My expectation with the Audio IC is SNR>100db and ADC Sample rate is minimum 192kHz.

Is this IC and circuit is proper for me? Will I need extra software for this job? 

Best regards.

Adnan

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CCS/CC2652R: Can't debug/release simplelink 1.60.00.43 ProjectZero example.

March 16, 2018, 7:43 am
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Part Number:CC2652R

Tool/software: Code Composer Studio

Board: cc26xr1 (cc2652r1f uC)

CCS: v7

I'm am trying to run the ProjectZero example with the newly acquired cc26xr1 but after have flashed the board (debugging) and hitting play,  I get the following error:

  • Cortex_M4_0: JTAG Communication Error: (Error -1170 @ 0x0) Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 7.0.48.0)
  • Cortex_M4_0: Failed to remove the debug state from the target before disconnecting. There may still be breakpoint op-codes embedded in program memory. It is recommended that you reset the emulator before you connect and reload your program before you continue debugging

I have reseted the board, erased the entire flash (with uniflash), updated the xds110 firmware and changed the optimization levels to 0.

What do I do to run this simple example?

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INA302: Current sensing by using INA302 in motor control

March 16, 2018, 7:44 am
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Part Number:INA302

Hello

I am going to use INA302 in my motor control application. It has ALERT and LATCH  pins which I don't  won't to use in my application. can I put them without any connection on my board.

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SN75DP159: EYE Scan tool - differences between SN75DP159 and TMDS181 ?

March 16, 2018, 7:44 am
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Part Number:SN75DP159

Hi,

last week we've bought a TMDS181RGZ Evaluation Module and testing the Eye Scan Tool it showed  the HDMI2.0 bug mentioned in user guide (sllu228a.pdf) on page 11

even worse.

The question now is will we see the same error with evaluation module for SN76DP159 (DP159RGZ) ?

Datasheet/Userguide of the last-mentioned part (sllu225.pdf) do not mention the error but it is older by two month; could be that this error had not been found yet.

Regards,

Michael

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UCD3138064: Question about:OVERSAMPLE and the delay of the controller

March 16, 2018, 7:47 am
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Part Number:UCD3138064

i want to design a buck converter with 200kHz switching frequency . i hope the bandwidth of close loop get up to 30KHz,  i konw there is a pure lag :e^(-j*w*Tdpwm), so i think i can use oversample X8,but there is useless.

Image may be NSFW.
Clik here to view.

Image may be NSFW.
Clik here to view.

So  do you know how to use the oversample? Whats wrong??? the  pure lag is fixed by the switching frequecy? how can operate the system with no pure lag in my foucs bandwidth？

With best regards

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TPA3111D1: About INP and INP pin

March 16, 2018, 7:50 am
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CC115L: Frequency shift with some devices

March 16, 2018, 7:57 am
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Part Number:CC115L

Have product transmitting on 900 Mhz band with the CC115L. However, some devices are at a -40Khz shift while others are right on.  After replace the CC115L with another one, the shift is gone.   Note: There is no communication as the -40Khz seems to put it out of band.

The spec states a 40PPM. Calculating here: 40KHz/900Mhz= 44 PPM which shows out of spec.

Looks like if I reduce the over all capacitance of the bypass caps (30pf each) a bit, it should bring it back into band.  But, can't good too much as it would too high on devices that don't have the lower shift.

Question is why some device seem to add to the shift while others do not?  Can I assume that the circuit is on the edge of the spec and the tolerance of the device then comes into play?  Keep in mind, the shift is either 40Khz or not and nothing in between.

Thanks  Jah.

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BQ21040: Mechanical Power Switch for use in portable device.

March 16, 2018, 8:09 am
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Part Number:BQ21040

I am working on a prototype hand-held measuring system that incorporates the BQ21040, a mechanical power switch, and a single lithium ion battery. The unit also includes a micro USB port for charging. The hand-held device uses Bluetooth to connect to a tablet or cell phone.

The hand-held device needs to be able to work either when the unit is plugged in (and charging) OR when the device is running on the battery.

I have the prototype board working in both scenarios. But, the charge LED comes on when the battery slide switch is in the off position. I was hoping to always leave the battery connected to the BQ21040 and then a power switch to isolate the rest of the hand-held device. In this way, the battery would charge whenever the cable was plugged in and the charge LED would illuminate... even if the power switch was in the off position. But, this is not working as desired. When I read the documentation my impression is that the B!21040 would go into a high-impedance power saving mode whenever the input voltage was removed.

I know I can move the mechanical power switch in a way to completely isolate the battery. But I was hoping to be able to charge the battery WITHOUT the switch being turned on.

What am I doing wrong here?

Image may be NSFW.
Clik here to view.

Image may be NSFW.
Clik here to view.

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ADS52J90EVM: ADS52J90EVM

March 16, 2018, 8:16 am
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Part Number:ADS52J90EVM

Hey guys

I am using Zynq ZCU102 FPGA board . We have bought this ADC board from Texas Instrument.

http://www.ti.com/tool/ADS52J90EVM

It has a FMC connector which gives output using JESD204B subclass 1 protocol. 

I am aware that currently you are providing capture cards which are altera based. You guys might have an idea Xilinx Boards.

I figured it out that there are two IPs in the Xilinx Vivado IP catalog. 

1- JESD204  ( which needs to be purchased ) 

2- JESD204 Phy ( included in the the current vivado licence)  

My question is, in order to setup the ADC board and get the digital data on zynq board, do we need both IP cores or one. ?

( in the product guide of JESD204 Phy, it states that we need to have JESD204 ip  ) 

 

Thanks alot for assistance. 

 

Best Regards

Rizwan 

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UCC256303: Ho pin no output

March 16, 2018, 8:18 am
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CCS/MSP430FR5969: ADXL345 accelerometer read and write by using I2C protocol

March 16, 2018, 8:23 am
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Part Number:MSP430FR5969

Tool/software: Code Composer Studio

Hii..this is harikrishna...

i am strugling with the read and write operation in adxl345 accelerometer slave by using I2C protocol..i need DRIVER LIBRARY program any on please help me..

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AM3357: 4GB SDHC card support

March 16, 2018, 8:28 am
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Part Number:AM3357

I have read 5052 26.1.8.5.2 System Interconnection of TRM.

Would like to clarify if AM3357 MMC0 can boot from a SDHC card of 4GB capacity?

Has anyone checked this in BBB?

BR,

Balaji

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TAS5630B: How is the Pin-to-Pin Short-Circuit protection implemented?

March 16, 2018, 8:30 am
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Part Number:TAS5630B

Hi,

We have a design using the TAS5630B in which VDD and GVDD_X rise several seconds before PVDD_X. As the PPSC detection system starts when VDD is supplied, we wonder if this system can detect OUT_X <-> GND_X and OUT_X <-> PVDD_X short circuits in our design (i.e. while PVDD_X are not supplied), or if it will always pass, even with shorts.

In order to answer this, we need to know how the PPSC protection works internally. We think that one possibility is that pulls are enabled while the half bridges are set in the Hi-Z state: during the first (resp. second) step detecting shorts from OUT_X to GND_X (resp. PVDD_X), a pull would be enabled internally between OUT_X and PVDD_X (resp. GND_X), so that the resulting voltage on OUT_X would be PVDD_X (resp. GND_X) with no short and GND_X (resp. PVDD_X) with a short, which would always give 0 V on OUT_X if PVDD_X is not supplied. Another possibility would be to connect VDD to OUT_X with a current limiter and to measure the voltage evolution on OUT_X.

Section "7.3.2.1 Powering Up" in the datasheet states that no power-up sequence is required, but it seems to compare only the supplies of VDD and GVDD_X while ignoring PVDD_X. Please clarify.

This section also states that it is not required (though recommended) to hold /RESET low while powering up the device. However, if we supply VDD and GVDD_X with /RESET low, then release /RESET, then only supply PVDD_X, we sometimes get unexpected overcurrents making the amplifier unusable. If we release /RESET only after having supplied VDD, GVDD_X, and PVDD_X, then everything always works fine.

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WL1805MOD: Intermittently Connected Device Sample Code

March 16, 2018, 8:38 am
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DAC7728: Reference Voltage Problem...

March 16, 2018, 8:31 am
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Part Number:DAC7728

After completing our Alpha design, and 10 units, we found the DAC range we need is much less than anticipated. However the precision we need is higher. We are using a 1.024V reference with a 4x multiplier. So our DAC output is 0->4.096V. However we need to have a 0->1.5V output range on the DAC. for the 12 bit resolution...

Is their anyway of decreasing the reference multiplier to less than 4, or using a 0.25->0.33V reference? We see the chip unfortunately specifies that we have to use a 1->5.5V reference, however if their was a way of making these work without de-soldering and replacing all the DAC's with the 14 or 16 bit version, that would be appreciated...

Thanks,

Tom

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