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TPS65982: Sink capability setting when there is no need to draw current

October 12, 2017, 4:43 am
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Part Number:TPS65982

Hi Team,

My customer’s product needs to support DRP(Toggling R_p/R_d) for Interoperability with Source/Sink peripherals. 

But the application fundamentally pretends as Source. And they don’t want it to be Sink except the case connecting with Provider only peripherals. So they assigns PP_HV as sink path and it left open since their application doesn’t need to pull current.

Then, they have a question about FW setting on Sink PDO.

Does Type-C standard including PD spec allow the following configuration (Supported DRP but no PDO supported as Sink)?

If it's allowable, What’s happened if TPS65982 doesn’t have Sink PDO as below?

If it’s NOT allowable, how much current shoud be set for  operating currents? 

Regards,

Takashi Onawa

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BOOSTXL-CC3120MOD: Which configuration is appropriate for my requirements?

October 12, 2017, 4:43 am
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CCS/TMS320F28335: tms320f28335

October 12, 2017, 4:51 am
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Part Number:TMS320F28335

Tool/software: Code Composer Studio

hai,

i am using dsp- tms320f28335 for acquisition , the values in adc result registers are given to dma buffer, then they are sent to pc via ethernet for monitoring in gui . the internal adc work in cascade mode so  16 inputs are taken at a time.length of dma buffer is 2000. 496 samples are send in a packet. problem is i am not able to monitor the signal in gui.

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OPT3002: How to decompose optical power through the different wavelengths

October 12, 2017, 4:54 am
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Part Number:OPT3002

Hello,

We are thinking of using the OPT3002 sensor to monitor the optical power to which the sensor is being exposed to. For this monitoring system we are interested in the discrimination of the optical power per wavelength. My question is, how can we do this with the OPT3002?

Should I just use the equation 4 present on chapter "Compensation for spectral response" (Optical_Power at Wavelength W = Optical_Power at 505 nm / R)? For example, if the sensor is being exposed to daylight, and I want to know the optical power at wavelength 400nm, 500nm and 600nm, should I just take the value reported by OPT3002 and decompose it on this 3 wavelengths using equation 4 present on chapter "Compensation for spectral response"?

Regards,

Carlos

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CC2650: CC2650 PAN Coordinator - FFD ASSOCIATION Issue

October 12, 2017, 4:57 am
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Part Number:CC2650

Hi,

 I am using TI CC2650 802.15.4 MAC code.But I am going through the Code I found that CC2650 is applicable only to create a PAN coordinator and to create RFD device.

 But I want to create 1 PAN Coordinator and 1 FFD(normal coordinator).Is it is possible using TI 15.4 MAC.

I have flashed TI FFD code to two cc2650 devices.Now I am trying to send association request from one FFD to another.But FFD device is not sending association request out to another FFD(which I assumed as PAN Coordinator).

Can any one tell me is it is possible to create a normal FFD device which can associate with PAN coordinator using TI code.?

Thanks 

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Compiler/CC2650: My code doesn't working in if device restarts through any means

October 12, 2017, 5:04 am
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Part Number:CC2650

Tool/software: TI C/C++ Compiler

Hi,

I am using CC2650 Launchpad.

IDE ----    IAR Embedded Workbench for ARM 7.80

TI RTOS ----- tirtos_cc13xx_cc26xx_2_20_01_08 a

SDK --- ble_sdk_2_02_01_18

My code working completely fine in debug mode and in release mode. But as soon as if I restart the device or re-insert the USB cable with the launchpad there is no activity by the MCU at all.

I have the UART driver implemented with debug logs, thus there is nothing which is coming on the serial port.

And if I take the device in debug mode again then everything will become fine until power is ON.

I read previous multiple threads, forums but nothing helped me for this case.

I have absolutely no idea where the device is getting stuck. 

Please help me out in this. 

Also if the pre-build hex files given for testing CC2650 launchpad is burned , they too aren't working.

For burning hex files I am using Flash Programmer 2 ver 1.7.5.

But the same files are working if burnt from using another laptop

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TDA3LA: output impedance for single 16bit DDR3 memory use

October 12, 2017, 5:07 am
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Part Number:TDA3LA

Hi Guys, 

TDA3x SoC DM (ABF) states:

Table 5-10. LVCMOS DDR DC Electrical Characteristics

Output impedance (drive strength) for 2x 32bit DDR3 memory devices. Would the use for 1x 16bit DDR connections make a difference in output impedance?

Many thanks,

Thorsten

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TMS320F28027: unreasonable PWM initial output pulse

October 12, 2017, 5:07 am
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Part Number:TMS320F28027

Hi, with code below, I configured PWM frequency 40kHz, up-down count mode, TBPRD=750. CMPA=0, CMPB=750. TBCLK=SYSCLK=60MHz.

void InitEPwm2()
{
EPwm2Regs.TBPRD = 750; //40kHz
EPwm2Regs.TBPHS.half.TBPHS = 0x0000;
EPwm2Regs.TBCTR = 0x0000;
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE;
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1;
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
EPwm2Regs.CMPA.half.CMPA = 0;
EPwm2Regs.CMPB = 750;
EPwm2Regs.AQCTLA.bit.ZRO = AQ_SET;
EPwm2Regs.AQCTLA.bit.CAU = AQ_CLEAR;
EPwm2Regs.AQCTLB.bit.PRD = AQ_SET;
EPwm2Regs.AQCTLB.bit.CBD = AQ_CLEAR;
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; 
EPwm2Regs.ETSEL.bit.INTEN = 1; 
EPwm2Regs.ETPS.bit.INTPRD = ET_1ST;
}

with such code, I should get always low on both PWMA and PWMB outputs.

But the fact is that I will always get 12.5us(=750TBCLK which is half of the PWM period) pulse high on PWMB for once only. PWMA is always low.

Then I changed CMPA=50, the waveform is as below. It can be seen that PWMB output turns high at the very beginning that TBCTR=0 and started to increment, and it turns low when TBCTR=TBPRD

I've checked EPwm2Regs.AQCTLB.bit.ZRO=00, which means that there should be no action on PWMB when TBCTR=0.

yellow-PWMA,

blue-PWMB.

So why is there a pulse on PWMB and only once?

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TS3A227E： TS3A227E The microphone has no sound

October 12, 2017, 5:12 am
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Part Number:TS3A227E

The microphone has no sound

When I use the probability of the microphone will not sound, why is it so?

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WL1807MOD: How to enable CH12 and 13

October 12, 2017, 5:25 am
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Part Number:WL1807MOD

Hi,

Our customer's application is using WL1807MOD WLAN(2.4Ghz),
and they are able to use the channels upto CH11 but cannot use CH12 & 13.

Please let us know how to enable CH12 and CH13.

Best Regards
Kummi

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CC2560: How start without any stack?

October 12, 2017, 5:30 am
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Part Number:CC2560

I have PAN1325B module with CC2560 on board. First i send service pack with succes. PAN1325 responds for some HCI command. And this is all. But how make this module discovarable and what commands i need to send to use this module as sink for music, I2S. I have to read all pages (almost 3000) bluetooth specification ? I read almost all topic in this forum. Why is there is no good introducion? Only a lot of commands. And dont say about any stack. 

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BQ27542-G1: How does PREDICTAMB work in BQ27542?

October 12, 2017, 5:35 am
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Part Number:BQ27542-G1

Hi Team,

as title, i would like to know how does PREDICTAMB work.

the TRM describe ambient temperature will affect gauging.

But I cannot to find how it work.

is there more detail data or describe for this function?

how to sense ambient temp?  

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Tms320c6713b: SDRAM programming

October 12, 2017, 5:37 am
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Part Number:Tms320c6713b

Hi,

I want to connect external sdram on CE0 of tms320c6713 in 16-bit mode. From spru266e, c6713 read/write in 4-word bust mode. As the interface is 16-bits thus the total bits read/written will be 64bits (16×4).

My question is how the C program can be written to read/write 64 bits at a time?? Will it look like this:

uint64_t *sdram = (uint64_t *)0x80000000

//write acceas 64 bits

*sdram = 0x1234567812345678

//read access

Uint64_t xyz = *sdram

Kindly correct me, as this code doesnt work.

Kind regards,

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ADS54J54: Polarity of SYNCb pins when it starts transmitting K28.5 character

October 12, 2017, 5:39 am
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Part Number:ADS54J54

Hello,

I have a question about ADS54J54.

[Background]

There is a description in the D/S P.27 7.3.3.1 JESD204B Initial Lane Alignment (ILA) as follows.

<D/S>

Upon detecting a logic low on the SYNCbAB input pins, the ADS54J54 device starts transmitting comma (K28.5) characters on channels A and B to establish code group synchronization.

Upon detecting a logic high on the SYNCbCD input pins, the ADS54J54 device starts transmitting comma (K28.5) characters on channels C and D to establish code group synchronization.

[Q]

Is the polarity of SYNCbCD really reverse to SYNCbAB when it starts transmitting K28.5 ?

Is this (Bold) an error ?

Best Regards,

Hiroshi Katsunaga

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Account Merge

October 12, 2017, 5:40 am
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Can you contact me about merging my previous account into this one?

cheers!

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LM3881: Output will not switch

October 12, 2017, 5:42 am
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Part Number:LM3881

I cant seem to get the LM3881 to switch. I have 5V power on the supply. I can see a sawtooth waveform on the TADJ pin. The INV pin is 5V. I originally had the EN pin connected to 5V, but I wasnt sure I could do this so I lifted the pin. But it still wont do anything. Do I need the EN connected as shown in the datasheet (capacitor or resistor divider). The eval board seems to indicate it can be left open.

Thanks

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TM4C1294NCPDT: construction of internal clock source

October 12, 2017, 5:44 am
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Part Number:TM4C1294NCPDT

Hi,

Can anyone shed light on how the internal oscillator is constructed: i.e. is it an embedded crystal or MEMs, or digital PLL device?

Looking at using this chip under extreme atmospheric pressure: hence wanted to gauge likely failure modes before pressure testing.

cheers

Mat

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TLV8801: Compatibility with tps61098x and output series resistance

October 12, 2017, 5:49 am
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Part Number:TLV8801

Greetings,

I'm working on a design which involves using TLV8801 or TLV8802 as a signal conditioning circuit for a PIR sensor. For both PIR sensor and TLV880x OPAMPs noise is an issue. The power source is a TPS61095 boost regulator in low power mode. As mentioned in the datasheet of TLV880x "Low bandwidth nanopower devices do not have good high frequency (> 1 kHz) AC PSRR rejection against high- frequency switching supplies and other 1 kHz and above noise sources, so extra supply filtering is recommended if kilohertz or above noise is expected on the power supply lines." What sort of filtering is needed to power PIR and the OPAMP from this regulator?

Also the output of the OPAMP is sampled by an ADC whose sampling capacitance is 2.5 pF. What sort of series resistance is needed for driving such a capacitive load?

Thanks and regards,

Prithvi

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TUSB8041: Is hot swapping (plugging) feature available

October 12, 2017, 5:53 am
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Part Number:TUSB8041

We are planning to use TUSB8041 in one of our USB 3.0 HUB device design.  We want hot swapping (plugging) feature for USB devices on USB downstream port. Please let me know whether TUSB8041 HUB controller is equipped with hot swapping feature?

 

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AM3358: SD card boot fails

October 12, 2017, 5:58 am
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Part Number:AM3358

Hi

I am trying to get my custom board up and running but it fails to start from the SD-card. My custom board is based on the BBB board with only minor modifications. Boot configuration is the same as the BBB.

I have followed the AM335x bringup tips and all voltage and frq (also CLKOUT1 after enabling it) is ok as well as PORZ.

When powering up the board I can measure data on the CLK pin of the SDcard and if a valid sdcard is inserted there is also data on data0 but it dies out short time after and nothing more happens. Uart0 is not available for measureing so I can't check if there is a "C" output. The SD-card has been tested on a BBB so I know for sure that it is working.

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