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SN74GTL1655: Output Ringing Issue

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Part Number:SN74GTL1655

Hi team,

My customer met an output ringing issue when using SN74GTL1655. Below is the test data.

When input (BLue) is slowly ramping in the slew rate of ~2.3V/ms, the output (green) will generate a pulse rather than a simple step.

Could you give any advice how to avoide such issues?

1. Is there any input slew rate requirement of that chip?

2. Is there any way to avoid the ringing in current slow slew rate input?

Thank you!


Linux/AM5728: Questions about PRU RPMsg driver on linux

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Part Number:AM5728

Tool/software: Linux

Hello,I tried to figure it out how A15 kicks PRU through RPMSG & mailbox,can you help me ,thanks ahead.

I read drivers/remoteproc/pru_rproc.c

static void pru_rproc_kick(struct rproc *rproc, int vq_id)
{
	struct device *dev = &rproc->dev;
	struct pru_rproc *pru = rproc->priv;
	int ret;

	dev_dbg(dev, "kicking vqid %d on PRU%d\n", vq_id, pru->id);

	if (pru->mbox) {
		/*
		 * send the index of the triggered virtqueue in the mailbox
		 * payload
		 */
		ret = mbox_send_message(pru->mbox, (void *)vq_id);
		if (ret < 0)
			dev_err(dev, "mbox_send_message failed: %d\n", ret);
	} else if (pru->irq_kick > 0) {
		ret = pruss_intc_trigger(pru->irq_kick);
		if (ret < 0)
			dev_err(dev, "pruss_intc_trigger failed: %d\n", ret);
	}
}

And I thought the driver rpmsg_pru should call "pru_rproc_kick" when it A15 send data out .

But : in drivers/rpmsg/rpmsg_pru.c("-->" means call  )

rpmsg_write() --> rmpsg_send() --> virtio_rpmsg_send --> rpmsg_send_offchannel_raw --> virtqueue_kick

I am now getting confused , question is :

1. How do the driver "rpmsg_pru.c" kicks PRU, I think the driver must access mailbox.

2.How do these drivers cooperate?  "rpmsg_pru.c",   "pru_rproc.c",   "omap-mailbox.c"

TIDA-01436: Recompile issue

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Part Number:TIDA-01436

For people counting,how can we recompile rico board kernel image and what are the steps for it.

RTOS/AM5728: problems when calling malloc

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Part Number:AM5728

Tool/software: TI-RTOS

Hi

as follows:

-------

int *ptr;

ptr =(int*)malloc(10);

ptr =(int*)malloc(20);

a valid pointer is returned when firstly calling malloc:       ptr =(int*)malloc(10);

but 0x00000000 is returned when calling                         ptr =(int*)malloc(20);

WHY?

TPS2373: TPS2373 identify non-standard PSE

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Part Number:TPS2373

Hi team,

Our customer evaluated TPS2373 EVM and meet some issue,

they use PLANET (PoE-171A-95) 802.3bt PoE injector test EVM and find below message,

" The TPS2372 is also able to interoperate with non standard PoE++ PSE controllers" 

1. Customer would like to know how TPS2373 to verify PSE is non-standard and how to analyze?

2. TPS2373 can still support 60W load with worming message above, it means TPS2373 also support non-standard?

3. Do we have recommend BT PSE injector?

Thanks & regards

Eddie

SN65HVD1794: About SN65HVD1794 Dpin & R pin pull up resistor selection

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Part Number:SN65HVD1794

Hi team,

For SN65HVD1794, D pin & R pin, do they need external resistor to pull up to VCC? 

Customer said they check the R pin voltage is 5V without pull up resistor. Have they been pulled up inside the device? are they open drain output?

We use 5V to power SN65HVD1794, Can we use resisitor pull up D & R to 3.3V like below picture show, because customer use 3.3V MCU in their applicaiton.

Can you share the SN65HVD1794 functional block diagram? 

thanks a lot.

CCS/RM48L952: the question about the *.out to *.hex

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Part Number:RM48L952

Tool/software: Code Composer Studio

the version of CCS is CCS for arm V6.2. can the *.out file transform to  *.hex? like the hex2000? thanks very much.

jianlei

DP83822I: Differences between DP83822 and TLK105

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Part Number:DP83822I

Hi,

I have to replace the TLK105 IC with an DP83822 IC. In the Datasheet of the TLK105 it is mentioned, that the IC can be used for ProfiNET applications.

In the Datasheet of the DP83822 nothing like is mentioned. Is the DP83822 able to use in ProfiNET applications?

Thanks for your answer.

With best regards

Fabian


DRV8301: OCP Report

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Part Number:DRV8301

Hi Sir 

Please kindly help to check this OCP issue 

When system power up ,DRV8301 will report OCP event to SOC 

At this moment ,there is no load on the output 

MOSFET Rds(on) = 1.2mohm~1.6mohm / report mode only / OC_ADJ_SET=0.175V on Vds => Over current rating is 145A~109A

schematic is below PDF

 

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

0x02

0

1

0

0

1

1

0

0

0

1

0

0x03

0

0

0

0

0

0

0

0

1

0

0

(Please visit the site to view this file)

TS3A5223: Help to check if we have 4:1 version solution of TS3A5223

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Part Number:TS3A5223

HI Team,

My customer is surveying for 1:4 mux solution supporting 1.05V signal. we found TS3A5223 is ok to meet the 1.05V need but this is 2:1 solution. Please check if TI has 4:1 MUX solution supporting 1.05V signal. Thanks 

UCD9090: UCD90xx

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Part Number:UCD9090

Hi Sir,

If our customer want to USE the Remote Thermal Controller to support 12 Fan, then do you have any PN suggest for this application?

6*PWM

12*TACH

Hugo

DRV8825: My step motor has some undesirable noise after I stop pulsing the STEP pin.

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Part Number:DRV8825

I  pulse the STEP pin to  drive a  step motor to  rotate half a circle  in forward and reverse direction.

But  after I stop pulsing the STEP  pin, the motor makes  some noise.

However, if the motor rotates in the forward direction  before I  stop pulsing, the noise usually occurs. 

if the motor rotates in the reverse direction  before I  stop pulsing, I didn't hear the noise.  So strange.

My configuration of DRV8825 is  as follows:

8 mocro-step,1,4A full-scale chopping current, mixed decay mode.

Could you tell me  what may cause the noise?

IWR1642: Recommend material for IWR1642 product‘s shell

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Part Number:IWR1642

Hi team,

A customer is asking which material should be used in IWR1642 product.

Customer is consider about the cost and the simplicity for manufacture.

He had mention that PTFE can not be used in injection molding production.

Customer had already know the experience we did for different materials.

Did you have any recommend material for that?

Thanks.

230V DC PWM (H-Bridge) Motor Driver ? Any Idea ?

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We are looking for a driver circuit / application to control motor speed and direction via a full-bridge / H-bridge driver.

The motors a 230V DC, 150W, 0.9A, brushed.

Ideally, the input voltage for the application would be 230V AV (mains). An isolated powersuplly, step down, buck) from the rectified 230V AC (= 325 DC) would

also be possible as an input stage.

Thanks in advance !

RTOS/TDA2: example to store SRV image on SDCARD

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Part Number:TDA2

Tool/software: TI-RTOS

Dear Team,

Is there any example to show how SRV video image can be stored on SD-CARD?

My customer want to have an example to store combined image of 4ch SRV, but any usecase would be welcome.

My customer is using VisionSDKv3.0.

Thanks and Best Regards,

SI.


BQ35100: Battery Charge Indicator for Battery Pack system

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Part Number:BQ35100

Hello,

I would like to use this chip (BQ35100) for a battery pack enclosure system we're developing for Lithium Thionyl Choride batteries.

In the same enclosure the pack could be 3.6v, 7.2v, 10.8v or 14.4v. My question is, would the fuel gauge be suitable for an application such as this where it may be monitoring a 3.6v pack and then the next time the enclosure if filled it could be 10.8v and so on. Does the chip need to be recalibrated each time the pack is changed? Are there any similar applications of the BQ35100 existing to the one I've just described? 

Thanks,

Karl

BQ24780S: the mechanism about opening the H-GATE of charging BUCK when there is no battery.

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Part Number:BQ24780S

We plug-in the adapter for the first time without baterry.  IC will driver the BUCK for some time .

During this time, I found that the waveform of H-gate is the same as that of phase,the waveform diagram is shown below.

As is shown in , the output is normal.  

So, how is H-gate opened.

LMP91000: Expected behaviour of bias blocks in 3 lead amperometric cell mode when INT_Z is set to bypass?

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Part Number:LMP91000

I am planning to use the LMP91000 in an evaluation project with a 3 lead amperometric cell: an NO2 cell, requiring a negative bias.

I wanted to be able to have access to the precise voltage used for the internal zero at the trans-impedance amplifier and one way to do this seems to be to use bypass mode for INT_Z where I am providing the INT_Z from an external reference source.

If I then use the LMP91K in 3 lead mode, will the A1 amplifier and variable bias blocks still be in functional mode i.e. driving the external Vref plus/minus (0-24%) as bias to the CE terminal?

LMZM33603: Need some Dimensions and .dxf File-Reg

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Part Number:LMZM33603

Please Provide  .dxf file for the Land pattern.Some Dimensions we could not find in the given Land Pattern.

BQ25600D: Input capacitance of SCL and SDA pin

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Part Number:BQ25600D

Hi,

Please let me ask the input capacitance of SCL and SDA pin of bq25600D. I don't need guaranteed value so rough typical value should be enough.

Best Regards,

Satoshi

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