Part Number:LPV821

Dear,

I am beginning my way with LPV821. I have a sensor with 5 wires. Two of them form a NTC thermsistor. I can calculate the temp from them :) That is nice.

The other two, theoretically, polarize themselves when measuring and between anode and cathode they present a voltage drop ~ 60 mV.

The last wire is the shield. Well, it is not a wire, I just separate and twist the shield so it does not mess with the other wires.

I have wired a LPV821 in differential amplifier configuration as in the following diagram.

In my case, Rf is about 47 kΩ and Rin around 1 kΩ, so the amplifier gain is about 50. For a 30 mV input signal, Vout is around1500 mV = 1.5V.

To test this, I feed to V1 and V2 a voltage divider measuring around 20 mV. This helps me testing the input range. I do not have the sensor inputs connected at this step.

The amplifier works, the signal is amplified and I can read the ADC in my msp430.

Unfortunately, when I replace such testing voltage divider and input instead the two wires of the sensor, my output is zero. However, I can read around ~30 mV when directly measuring them with my multimeter!

So, probably I am understanding (and doing) something wrong. Please give me your opinions! My thoughts are:

1. Maybe I need to connect the shield to my circuit GND? I am not doing this. And because of the multimeter works, I do not thought was necessary.
2. Maybe the sensor output behaves in a way the LPV821 cannot follow it?

Well, I do not know! Please share your knowledge because my opamp skills are quite lame :)

Have a nice weekend!

Part Number:TMS320C6678

Tool/software:TI-RTOS

I am profiling the performance of complex SVD provided in DSPLIB with this piece of simple code below:

#include <ti/dsplib/dsplib.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

#include <xdc/runtime/System.h> /* header files for System_printf, TSCL and cache function calls, AKM */
#include "c6x.h"

#define N 12

float a[N * N * 2], aU[N * N * 2], aV[N * N * 2], aU1[N * N * 2], adiag[N * N * 2], asuper[N * N * 2];
float b[N * N * 2], bU[N * N * 2], bV[N * N * 2], bU1[N * N * 2], bdiag[N * N * 2], bsuper[N * N * 2];

int main(void) {
  int i, j;

  for (i = 0; i < N; ++i) {
    for (j = 0; j < N; ++j) {
      float real = (j - i + N) % N + 1;
      float imag = (j - (N - 1 - i) + N) % N + 1;
      a[i * N * 2 + j * 2] = real;
      b[i * N * 2 + j * 2] = real;
      a[i * N * 2 + j * 2 + 1] = imag;
      b[i * N * 2 + j * 2 + 1] = imag;
    }
  }

  DSPF_sp_svd_cmplx(N, N, b, bU, bV, bU1, bdiag, bsuper);

  long long start = _itoll(TSCH, TSCL);

  DSPF_sp_svd_cmplx(N, N, a, aU, aV, aU1, adiag, asuper);

  long long end = _itoll(TSCH, TSCL);
  long long span = end - start;

  printf("%f\n", span * 0.0008);

  return 0;
}

It gives me 0.00000. I tracked the code step by step and I found after calling the routine the value did not change.

Part Number:DS90C385A

Hi,

I have one question regarding TxCLKOUT+/TxCLKOUT- pin of DS90C385A.

My customer would like to insert the damping resistor to TxCLKOUT+/TxCLKOUT- pin. Is it allowed?

As background of this question,  customer suspects taht the LVDS signal may be the source of the radiation noise.

Customer thinks that adding the damping resistance would reduce the radiation noise by making the rise and fall of the differential clock waveform of the LVDS signal gentler.

If it is allowed, what value is recommended?

I appreciate your quick reply.

Best regards,

Michi

Tool/software: TI C/C++ Compiler

I download the "uartecho'' project of the CC1310DK_7XD in "Help->Information Center->Integrade Solutions->example projects of Texas Instruments"

I use the iar for arm 8.1.11

I try to  use some versions tirtos,example for tirtos_cc13xx_cc26xx_2_18_00_03,tirtos_cc13xx_cc26xx_2_20_00_06,tirtos_cc13xx_cc26xx_2_20_01_08 and tirtos_cc13xx_cc26xx_2_21_00_06.

But I can't make success?

When  I use the tirtos_cc13xx_cc26xx_2_2_20_01_08 and tirtos_cc13xx_cc26xx_2_20_00_06

error；

Error[Pe020]: identifier "UARTCC26XX_HWAttrsV2" is undefined D:\me\code\demo_uart\CC1310DK_7XD.c 141
Error while running C/C++ Compiler

When I use the tirtos_cc13xx_cc26xx_2_21_00_06

error:

Performing Pre-Build Action
Error while running "c:/ti/xdctools_3_32_00_06_core/xs"
--xdcpath="c:/ti/tirtos_cc13xx_cc26xx_2_21_00_06/packages;c:/ti/tirtos_cc13xx_cc26xx_2_21_00_06/products/tidrivers_cc13xx_cc26xx_2_21_00_04/packages;c:/ti/tirto
s_cc13xx_cc26xx_2_21_00_06/products/bios_6_46_01_37/packages;c:/ti/tirtos_cc13xx_cc26xx_2_21_00_06/products/uia_2_01_00_01/packages" iar.tools.configuro
-c "D:\IARARM\IAR_Systems\Embedded_Workbench_8.0\arm" --cc "D:\IARARM\IAR_Systems\Embedded_Workbench_8.0\arm\bin\iccarm.exe" --device
"CC1310F128" --compileOptions "dummy.c -o D:\me\code\demo_uart\Debug\Obj --no_cse --no_unroll --no_inline --no_code_motion --no_tbaa --no_clustering
--no_scheduling --debug --endian=little --cpu=Cortex-M3 -f D:\me\code\demo_uart/configPkg/compiler.opt.defs --diag_suppress=Pa050
-Ic:/ti/tirtos_cc13xx_cc26xx_2_21_00_06/products/cc13xxware_2_04_03_17272 -Dewarm --debug --silent -e --fpu=None --dlib_config D:\IARARM\IAR_Systems\
Embedded_Workbench_8.0\arm\INC\c\DLib_Config_Normal.h -Ol" --linkOptions "-o D:\me\code\demo_uart\Debug\Exe\demo_uart.out --map D:\me\code\
demo_uart\Debug\List\demo_uart.map --config D:\me\code\demo_uart/demo_uart_CC1310DK_7XD.icf -f D:\me\code\demo_uart/configPkg/linker.cmd
c:/ti/tirtos_cc13xx_cc26xx_2_21_00_06/products/cc13xxware_2_04_03_17272/driverlib/bin/iar/driverlib.lib --silent --cpu=Cortex-M3 --entry=__iar_program_start
--redirect _Printf=_PrintfSmall --redirect _Scanf=_ScanfSmall --semihosting --entry __iar_program_start --vfe --text_out locale" --profile release --projFile "D:\me\code\
demo_uart\demo_uart.ewp"

when I use the  tirtos_cc13xx_cc26xx_2_18_00_03

error:

Fatal Error[Pe1696]: cannot open source file "ti/drivers/timer/GPTimerCC26XX.h" D:\me\code\demo_uart\CC1310DK_7XD.c 51
searched: "C:/ti/tirtos_cc13xx_cc26xx_2_18_00_03/packages/"
searched: "C:/ti/tirtos_cc13xx_cc26xx_2_18_00_03/products/tidrivers_cc13xx_cc26xx_2_16_01_13/packages/"
searched: "C:/ti/tirtos_cc13xx_cc26xx_2_18_00_03/products/bios_6_45_02_31/packages/"
searched: "C:/ti/tirtos_cc13xx_cc26xx_2_18_00_03/products/uia_2_00_05_50/packages/"
searched: "c:/ti/xdctools_3_32_00_06_core/packages/"
searched: "D:/me/code/demo_uart/configPkg/../"
searched: "c:/ti/tirtos_cc13xx_cc26xx_2_18_00_03/products/cc13xxware_2_03_03_17162/"
searched: "D:\IARARM\IAR_Systems\Embedded_Workbench_8.0\arm\inc\"
searched: "D:\IARARM\IAR_Systems\Embedded_Workbench_8.0\arm\inc\c\"
current directory: "D:\me\code\demo_uart"
Error while running C/C++ Compiler

How to do？

thanks

Part Number:TIDA-01622

Dear Sir,

Please see the TIDA-01622 schematic page 2 as tidrvm3.pdf that have something error at schematic ,please help to update the schematic.

Thanks.

Elton Tsao.

Part Number:TPS65150-Q1

Hi team,

My customer is using TPS65150, and we'd like to know the current limitation of VGL. Because our load of VGL is about 300mA. Does it work?

Thanks, 

Cera

Part Number:TLV320ADC3101

Hi~ 

 Customer using TLV320ADC3101.

 They use active analog microphone and mic output can active after 100uS after power on.

 But when record mic data after ADC3101, mic output was masked for some period especially when gain is high(when gain is 32, beginning of mic input was masked, in recorded file, speaker told ‘Hi~ Silo’ but could hear just ‘~ lo’ part.)

Q1> When ADC3101 operate, does it need microphone stable time?

 Q2> Why high gain(32) has more masking beginning of input?

 Q3> When hear recorded file, could see pop up noise, how to improve?

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

Let me have any advice.

Thanks.

Part Number:TPS543B20

Hi,

Customer is troubled because TPS543B20 output voltage is not stabilized.
Could you check the attached waveform?

(Please visit the site to view this file)

I got the following question from a customer.

■Is pattern2 out put oscillating? And Is output stopped correctly with understanding OVP?

■When changing from pattern 1 to pattern 2, please tell me the reason for oscillation

■Duty is sparse in pattern 2. Please tell me the reason.

■Is the pulse skipping operation of pattern 3 normal operation?
　Please tell me the reason for pulse skipping.

Best Regards,
Yusuke/Japan Disty

Part Number:OPA615

Hi,

I have some questions about OPA615.

Our customers are considering OPA615, but they have some concerns.

Q1. According to the datasheet, Transient: 5 mV. How does this specification affect the customer system?

      Will transients multiplied by gain appear in the output after entering hold mode and sample mode?

Q2. Is it no problem if the duty ratio of sample mode and hold mode is not 1: 1? Customer's requirement specification is extremely long hold mode( sample=5% ,hold =95%).

Q3.  Customer inputs a signal of 50 MHz to 500 MHz. Also change OTA to low bias OPAMP to minimize leakage.

      Therefore, it is necessary to know the closed loop bandwidth of SOTA. Figure 30 is the result of measuring with the following circuit?

      I tried AC analysis with TINA and found the same result.

Could you please support me?

Thank you.

Hiroshi

(Gain=1, always sample mode,)

Part Number:AM3352

Tool/software: Linux

I use a hub chip USB2514 to  connect to the USB musb-hdrc.1。The system is running after a while,sometimes the usb port from the hub,can not work well。when I insert a  USB flash disk  ,kernel will report errors like these

usb 2-1.1: new high-speed USB device number 13 using musb-hdrc
usb 2-1.1: New USB device found, idVendor=0930, idProduct=6544
usb 2-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-1.1: Product: DataTraveler 2.0
usb 2-1.1: Manufacturer: Kingston
usb 2-1.1: SerialNumber: 60A44C3FAC7DCFB149722461
scsi5 : usb-storage 2-1.1:1.0

and then I enter cmd "fdisk -l",kenel will report like these 

uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock0, sector 0
Buffer I/O error on device mtdblock0, logical block 0
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock0, sector 8
Buffer I/O error on device mtdblock0, logical block 1
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock0, sector 16
Buffer I/O error on device mtdblock0, logical block 2
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock0, sector 24
Buffer I/O error on device mtdblock0, logical block 3
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock0, sector 0
Buffer I/O error on device mtdblock0, logical block 0

my linux version is 3.2.0

and one port from hub is connectedt to a 4G module ,and it will use these port to virtual 5 serial ports。

and the usb port which is not conneted to 2514 usb hub chip can use USB flash disk  well.

Part Number:TPA2005D1

Hi,

If I am giving supply voltage of 3V to TPA2005D1 (I am using it in single ended mode), what is the maximum signal voltage that can be given to TPA2005D1. If we give line level it that good enough, or we can provide as high as 3VPP.

Regards,

Tapas 

Part Number:AM5728

Tool/software: Linux

Hi,

I found :  http://processors.wiki.ti.com/index.php/OpenCV  says there are edma examples in gauss.cl, sobel.cl, thresh.cl

But I didn't find them in " tiopencv ".

How can I find them ?

Part Number:PROCESSOR-SDK-AM57X

Tool/software: Linux

Hi,

I would like to know the footprint size of Processor SDK when only using graphic feature ( including 3D accelerator ).

How many size is needed?

Also our customer would like to use X Window instead of Wayland. Is the footprint big difference with this?

I appreciate your quick reply.

Best regards,

Michi

Part Number:TPS65131

Tool/software: Code Composer Studio

UPSIDE IS MY power schematic ，but i find there is no negative output ，I try to change D5 to 1N5819,but it has no effective，can somebody tell me why？I measure the resistor between negative output and gnd is 20KΩ，and so the  positive output。

Part Number:LAUNCHXL-F28069M

Hi

I want to configure the I2C to use no interrupt but the TX FIFO in master mode only

I need only Tx as a master, no reading (Rx). It is to control an OLED screen SSD1306

After many searches and examples I managed to have this config

The configuration

//-----------------------------------------------------------------------------
// InitI2C - This function initializes the I2C to a known state.
void InitI2C()
{
    // Initialize I2C-A
   I2caRegs.I2CMDR.all = 0x0000;
   I2caRegs.I2CSAR = I2C_SLAVE_ADDR;		// Slave address
   // 90 MHz/( (8+1)(10+5 + 5+5)) = 400 kHz
   I2caRegs.I2CPSC.all = 8;		    		// Prescaler - need 7-12 Mhz on module clk
   I2caRegs.I2CCLKL = 10;					// NOTE: must be non zero
   I2caRegs.I2CCLKH = 5;					// NOTE: must be non zero

   //I2caRegs.I2CIER.all = 0x24;			// Enable SCD & ARDY interrupts  0010 0100
   I2caRegs.I2CIER.all = 0x00;				// No interrupt
//   I2caRegs.I2CIER.bit.AAS = 0;				// Addressed as slave interrupt enable bit
//   I2caRegs.I2CIER.bit.SCD = 1;				// Stop condition detected interrupt enable bit
//   I2caRegs.I2CIER.bit.XRDY = 0;			// Transmit-data-ready interrupt enable bit
//   I2caRegs.I2CIER.bit.RRDY = 0;			// Receive-data-ready interrupt enable bit
//   I2caRegs.I2CIER.bit.ARDY = 1;			// Register-access-ready interrupt enable bit
//   I2caRegs.I2CIER.bit.NACK = 0;			// No-acknowledgment interrupt enable bit
//   I2caRegs.I2CIER.bit.ARBL = 0;			// Arbitration-lost interrupt enable bit

   //I2caRegs.I2CFFTX.all = 0x6000;			// Enable FIFO mode and TXFIFO
   I2caRegs.I2CFFTX.bit.I2CFFEN = 1;		// Enable the I2C FIFO mode
   I2caRegs.I2CFFTX.bit.TXFFRST = 1;		// Enable the transmit FIFO operation
   I2caRegs.I2CFFTX.bit.TXFFINTCLR = 0;		// Clear the TXFFINT flag
   I2caRegs.I2CFFTX.bit.TXFFIENA = 0;		// TXFFINT flag does not generate an interrupt when set
   I2caRegs.I2CFFTX.bit.TXFFIL = 0;			// Transmit FIFO interrupt level

   //I2caRegs.I2CFFRX.all = 0x0000;			// No RXFIFO, no clear RXFFINT
   I2caRegs.I2CFFRX.bit.RXFFRST = 0;		// **Disable** the receive FIFO operation
   I2caRegs.I2CFFRX.bit.RXFFINTCLR = 0;		// Clear the RXFFINT flag
   I2caRegs.I2CFFRX.bit.RXFFIENA = 0;		// RXFFINT flag does generate an interrupt when set
   I2caRegs.I2CFFRX.bit.RXFFIL = 0;			// Receive FIFO interrupt level

   //I2caRegs.I2CMDR.all = 0x0020;			// Take I2C out of reset,Stop I2C when suspended
   I2caRegs.I2CMDR.bit.NACKMOD = 0;			// NACK mode bit
   I2caRegs.I2CMDR.bit.FREE = 0;			// Stop I2C when suspended
   I2caRegs.I2CMDR.bit.STT = 0;				// START condition bit
   I2caRegs.I2CMDR.bit.STP = 0;				// STOP condition bit
   I2caRegs.I2CMDR.bit.MST = 0;				// Slave mode
   I2caRegs.I2CMDR.bit.TRX = 0;				// Receiver mode
   I2caRegs.I2CMDR.bit.XA = 0;				// 7-bit addressing mode
   I2caRegs.I2CMDR.bit.RM = 0;				// Nonrepeat mode
   I2caRegs.I2CMDR.bit.DLB = 0;				// Digital loopback mode is disabled
   I2caRegs.I2CMDR.bit.IRS = 1;				// The I2C module is enabled
   I2caRegs.I2CMDR.bit.STB = 0;				// The I2C module is not in the START byte mode
   I2caRegs.I2CMDR.bit.FDF = 0;				// Free data format mode is disabled
   I2caRegs.I2CMDR.bit.BC = 0;				// 8 bits per data byte

    oledInit();
	oledClear();
	oledGotoYX( 0, 0 );
	oledPrint( "PWM" );
}
//-----------------------------------------------------------------------------
int16_t i2c1Xfer(
	Uint8 address,
	Uint8* wdata, int wsize,
	Uint8* rdata, int rsize )
{
Uint16 i;

//	I2caRegs.I2CMDR.bit.IRS = 1;

//	// Make sure I2C is not busy and has stopped
//	while (I2caRegs.I2CSTR.bit.BB == 1);		// busy loop
//	I2caRegs.I2CSTR.bit.SCD = 1;				// Clear the SCD bit (stop condition bit)
//	while(I2caRegs.I2CMDR.bit.STP == 1);		// stop bit loop

	I2caRegs.I2CSAR = address;           			// I2C slave address
//	while (I2caRegs.I2CSTR.bit.BB == 1);		// still busy?

    I2caRegs.I2CCNT = wsize;					// Setup number of bytes to send


	for (i=0; i<wsize; i++)
		{
//		usDelay(1);
		I2caRegs.I2CDXR = *(wdata+i);
		}
	I2caRegs.I2CMDR.all = 0x6E20; 				// Send the TX FIFO :   0110 1110 0010 0000
//	I2caRegs.I2CMDR.all = 0x6620; 				// STT=1 :   0111 0110 0010 0000

	//	I2caRegs.I2CMDR.bit.NACKMOD = 0;			// NACK mode bit
	//	I2caRegs.I2CMDR.bit.FREE = 1;				// Run free I2C when suspended
	//	I2caRegs.I2CMDR.bit.STT = 1;				// START condition bit
	//	I2caRegs.I2CMDR.bit.STP = 1;				// STOP condition bit
	//	I2caRegs.I2CMDR.bit.MST = 1;				// Master mode
	//	I2caRegs.I2CMDR.bit.TRX = 1;				// Transmitter mode
	//	I2caRegs.I2CMDR.bit.XA = 0;					// 7-bit addressing mode
	//	I2caRegs.I2CMDR.bit.RM = 0;					// Nonrepeat mode
	//	I2caRegs.I2CMDR.bit.DLB = 0;				// Digital loopback mode is disabled
	//	I2caRegs.I2CMDR.bit.IRS = 1;				// The I2C module is enabled
	//	I2caRegs.I2CMDR.bit.STB = 0;				// The I2C module is not in the START byte mode
	//	I2caRegs.I2CMDR.bit.FDF = 0;				// Free data format mode is disabled
	//	I2caRegs.I2CMDR.bit.BC = 0;					// 8 bits per data byte

//	I2caRegs.I2CMDR.bit.STP = 1;  				// stop bit when CNT=0
//	usDelay(1);
//  while(!I2caRegs.I2CSTR.bit.SCD);       	// wait for STOP condition

	return I2C_SUCCESS;
}
//-----------------------------------------------------------------------------
void oledCommand( Uint8 ch )
{
    Uint8 bytes[2];
    bytes[0] = SSD1308_Command_Mode;
    bytes[1] = ch;
    i2c1Xfer( SSD1308_Address, bytes, 2, NULL, 0 );
}


  oledCommand(0xA7);          //--SSD1308_Inverse_Display_Cmd :  0x80 0xA7

this order should give 0x3C as a write order (1bit shifted) then the 0x80 (cmd) then 0xA7

instead of that

I have a strange of a beginning with  8 bits clk, with 0 than the Stop than the addy in write mode, no first byte then the end byte??? and no stop bit

if I try to add the while it stops working..

Thanks for your help

Part Number:OPA172

Dear

our client design opa172 as attached, and lastet question we got  the answer from Ronald Michallick as below link:

(Please visit the site to view this file)

Assuming headphone is a 32 ohm load. there will be more voltage loss across R70 and C73. Xc=1/(6.28*2.2uF*1kHz)= 72 ohms.
Headphone voltage will be 3Vpp * 32 ohms / ( 32 ohms + 50 ohms + 72i ohms)
3Vpp * 32 ohms / ( 82 ohms + 72i ohms)
3Vpp * 32 ohms / sqrt ( 82^2+ 72^2) ohms
0.88Vpp ; this is close to actual green signal, so problem identified.

so OPA172 is correct soultion? and  how to enhance gain ,we cannot assign customer use low resisger headphone to test.

If any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence.

TI Designs – Precision: Verified Design
Single-Supply, Electret Microphone Pre-Amplifier
Reference Design

Part Number:TDA2EG

Tool/software: Code Composer Studio

I was going to change the frequency to 600Mhz, so I simulated on CCS6.2.0 before uboot. After I tested it, there was a problem like this:
>>Posible Configuration Error: Ratio Maximum/ Minimum  Didn't Converge.

I have no idea to solve this problem. There was a solution that someone suggested to use hardware leveling. Unfortunately, I didn't know how to do hardware leveling.

Please help me to solve the question or give me some advise.

Here are some details of my simulation:
CCS6.2.0
Avatar EMIF tools(use a15 project)
SPRAC36A_EMIF_RegisterConfig.excel(this is revision 2.0.0. Avatar emif tools have a build-in revision 1.0.0. Revision 2.0.0 adds three new parameters in strucure emif_cfg: .ecc_ctr1,.ecc_addr1,.ecc_addr2. I commanded them because i don't know how to add them correctly into a15 project.)

Part Number:AWR1642BOOST

Tool/software: Code Composer Studio

Hi All who will be concern,

I can run demo under SDK1.1, but I can't run SRR (TIDEP-0092), the problem is:

It seems that I can't load configuration data into radar, how to solve this problem?

Thanks in advance!

Regards!

Daopu

Part Number:LM3481

Hi team,

For LM3481, external soft start is in need? We add the external soft start in flyback circuit, and we find the comp vibrate when external soft start finished.Could you help me?

thanks

Part Number:TMS320C6748

Tool/software: Code Composer Studio

I have been dealing with a problem with TMS320C6748 device using  XDS510-USB2.0. I am using CCS3.3 at the moment and I keep recieving an error when connecting.

"Error connecting to the target:
Error 0x80000244/-2131
Fatal Error during: Register, Initialization, OCS,
Cannot access register at 0x00000000"

I attempted to run "XDS510USB_reset.bat" and "XDS510USB_probe.bat" with CMD.

There seems to have a problem "Counter1 carry bit test failed at bit ff.", but I am really confused with what is going on with my device and don,t know how to deal with it.

I would really appreciate if someone could help me and I am fairly new to this.

Anyways, thank you to whoever response.