LDC1101: waveform configuration

David Nguyen18

Prodigy 130 points

Part Number: LDC1101

Dear friends,

I am now working with STM32F103-LDC1101.

After configuring the LDC1101, I found that the output waveform is not similar to the datasheet.

Here is the output waveform from INA and INB.

Please help me to configure the LDC1101 to generate the output waveform similar to EVM.

Thank you

Here is my setting for SPI:

void SPI_CLOCK_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

//    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_0); 
    RCC_MCOConfig(RCC_MCO_HSE); //Sets MCO to 8 MHz
//    RCC_MCOConfig(RCC_MCO_SYSCLK); //Sets MCO to 8 MHz
//     __disable_interrupt();
//     __enable_interrupt();
}

void SPI_Configuration(void)
{
  uint32_t Div = 2;
  uint32_t DivVal = 0;
  GPIO_InitTypeDef GPIO_InitStructure;
  SPI_InitTypeDef SPI_InitStructure;
  RCC_ClocksTypeDef Clk;
// Init LCD IOs and SPI1  
  RCC_APB2PeriphResetCmd(  RCC_APB2Periph_GPIOA
                         | RCC_APB2Periph_GPIOB
                         | RCC_APB2Periph_SPI1
                         | RCC_APB2Periph_AFIO,
                           DISABLE);
  RCC_APB2PeriphClockCmd(  RCC_APB2Periph_GPIOA
                         | RCC_APB2Periph_GPIOB
                         | RCC_APB2Periph_SPI1
                         | RCC_APB2Periph_AFIO,
                         ENABLE);
  // Deinitializes the SPI1
  SPI_I2S_DeInit(SPI1);
  /* Configure SPI_MASTER pins: SCK and MOSI ---------------------------------*/
  GPIO_InitStructure.GPIO_Pin = SPI_MASTER_PIN_SCK | SPI_MASTER_PIN_MOSI;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(SPI_MASTER_GPIO, &GPIO_InitStructure);
  /* Configure SCK and MOSI pins as Alternate Function Push Pull */  
  GPIO_InitStructure.GPIO_Pin = SPI_MASTER_PIN_MISO;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(SPI_MASTER_GPIO, &GPIO_InitStructure);
  /* Configure SPI pins : NSS4 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure); 
  /* SPI1 no remap (NSS/PA4, SCK/PA5, MISO/PA6, MOSI/PA7) */
  GPIO_PinRemapConfig(GPIO_Remap_SPI1, DISABLE);
  
  /* SPI_MASTER configuration ---------------------------*/
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI_MASTER, &SPI_InitStructure);

  /* Enable SPI_MASTER TXE and RXNE interrupt */
//  SPI_I2S_ITConfig(SPI_MASTER, SPI_I2S_IT_TXE, ENABLE);
// SPI_I2S_ITConfig(SPI_MASTER, SPI_I2S_IT_RXNE, ENABLE);

  // Clock Freq. Identification Mode < 4MHz
  RCC_GetClocksFreq(&Clk);

  while ((MAX_SPI_FREQ * Div) <= Clk.PCLK1_Frequency)
  {
    Div <<= 1;
    if (++DivVal == 7)
    {
      break;
    }
  }

  SPI1->CR1 = (SPI1->CR1 & ~(0x7 << 3)) | ((DivVal&0x7) << 3);

  // Enable SPI1
  SPI_Cmd(SPI1, ENABLE);
}
void SPI_write(uint8_t addr, uint8_t data) 
{
  addr = addr & 0x7F; // The MSB is a 0-write register, which is a 1-read register
  LDC_CS_LOW;
  delay_a(1);

    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(SPI1, addr); // send 8Bit address
    while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
    SPI_I2S_SendData(SPI1, data); // send 8Bit 8bit data
    while (SPI1->SR & SPI_I2S_FLAG_BSY);  
    
  LDC_CS_HIGH;
  delay_a(2);  
}

uint16_t SPI_read(int8_t addr)
{
    static uint8_t data=0;
    addr = addr | 0x80; // The MSB is 1-read register
    
  delay_a(5);
  LDC_CS_LOW;
  delay_a(2);
  
    // address bits
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(SPI1, addr);// send Address
    while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
    SPI_I2S_ReceiveData(SPI1);
    // data bits
    while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
    SPI_I2S_SendData(SPI1, 0x00);
    while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
    data = SPI_I2S_ReceiveData(SPI1);

    while( SPI1->SR & SPI_I2S_FLAG_BSY );
    
    delay_a(2);
    LDC_CS_HIGH;
    delay_a(5);  

    return data; 
}

#include "stm32f10x.h"
#include "LDC1101.h"
#include "LDC1101_CMD.h"
/* Global variable----------------------------------------------------*/
uint32_t LHR_DATA;
uint16_t RP_DATA;
uint16_t _responsetime; // Response Time
uint8_t _divider;       // divider
uint16_t _LHRoffset;    // LHR_OFFSET
float _RPmin;           // RP_MIN
float _RPmax;           // RP_MAX
float _fsensor;         // f_sensor: the calculated frequency of the sensor
float f_sensor_min = 5E+5;

float _fCLKIN = 8E+6;          // f_CLKIN: frequency of external clock: 16MHz
float _cap = 42E-9;             // capacitor: 120 pF
uint16_t _Rcount = 0x1F29;       // The reference count - 1kSPS 0x1F29



/*----------------------------------------
Function: LDC write register
Function parameters: 
                    addr: register address
                     dat: data
----------------------------------------*/
void writeSPI(uint8_t dat , uint8_t addr)
{
//  uint16_t tmp=0;
//  uint32_t i = 0;
  
  addr = addr & 0x7F; // The MSB is a 0-write register.
//  tmp = ((uint16_t)addr << 8) | dat;
  LDC_CS_LOW;
  delay_a(1);
    
  // address bits
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
  SPI_I2S_SendData(SPI1, addr);
  // data bits
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
  SPI_I2S_SendData(SPI1, dat);
  while( SPI1->SR & SPI_I2S_FLAG_BSY );

  LDC_CS_HIGH;
  delay_a(2);  
}


/*----------------------------------------
Function: LDC read register
Function parameters: 
                    addr: register address
----------------------------------------*/
uint8_t readSPI(int8_t addr)
{	
  static uint8_t data=0;
//  uint16_t tmp = 0;
  addr = addr | 0x80; // The MSB is 1-read register
//  tmp = ((uint16_t)addr << 8);
  delay_a(5);
  LDC_CS_LOW;
  delay_a(2);
  
  // address bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_I2S_SendData(SPI1, addr);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  SPI_I2S_ReceiveData(SPI1);
   // data bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_I2S_SendData(SPI1,0x00);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  data=SPI_I2S_ReceiveData(SPI1);
  
  while(SPI1->SR & SPI_I2S_FLAG_BSY);

  delay_a(2);
  LDC_CS_HIGH;
  delay_a(5);  
  
  return data; 
}

Here is my setting for LDC1101: 

void func_mode(LDC_MODE mode)
{ 
  // Sleep mode
  writeSPI(mode,0x0B);
//  delay(0.8); 
  
}
void setRPmode( void )
{

  writeSPI( 0x02, 0x05 ); // ALT_CONFIG:  0000 0010 --> RP modus + Shutdown enabled
  writeSPI( 0x00, 0x0C ); // D_CONFIG:    Enables LHR modus, disables RP 
}
void setLHRmode(void){

  writeSPI(0x01,0x05);
  writeSPI(0x01,0x0C);
}
void setResponseTime(LDC_RESPONSE responsetime)
{
  static uint16_t resps[] = {0, 0, 192, 384, 768, 1536, 3072, 6144};
  _responsetime = resps[responsetime];
//  uint8_t DIG_CONF;    
//  DIG_CONF = readSPI(0x04); 
//  writeSPI(( DIG_CONF & 0xF8) + responsetime, 0x04);
  writeSPI(responsetime, 0x04);
}
void setReferenceCount(uint16_t rcount)
{
  _Rcount = rcount;
  uint8_t LHR_RCOUNT_LSB = (rcount & 0x00ff);
  uint8_t LHR_RCOUNT_MSB = ((rcount & 0xff00) >> 8);
  writeSPI(LHR_RCOUNT_LSB, 0x30);   //LSB
  writeSPI(LHR_RCOUNT_MSB, 0x31);   //MSB
}
void set_fsensor_min(void)
{
//  uint8_t DIG_CONF;    
//  DIG_CONF = readSPI(0x04);
//  uint8_t MIN_FREQ = 16.0f - (8.0f / f_sensor_min);
//  writeSPI(((MIN_FREQ << 4) + (DIG_CONF & 0x00)), 0x04 );
  writeSPI(0x00,0x04);
}
void setRPsettings(bool RP_MAX_DIS, RPMAX rpmax, RPMIN rpmin)
{
  static float rps[] = {96, 48, 24, 12, 6, 3, 1.5, 0.75};
  _RPmin = rps[rpmin];
  _RPmax = rps[rpmax];
  writeSPI((RP_MAX_DIS << 7) | (rpmax << 4) | rpmin, 0x01);
}
void setDivider(DIVIDER div)
{
  static uint8_t divs[] = {1, 2, 4, 8};
  _divider = divs[div];    
  writeSPI(div, 0x34);
} 
void setLHRoffset( uint16_t offset )
{
  _LHRoffset = offset;
  uint16_t LHR_OFFSET = offset;
  writeSPI((uint8_t) (LHR_OFFSET & 0x00ff), 0x32 );           // LSB
  writeSPI((uint8_t) ((LHR_OFFSET & 0xff00) >> 8), 0x33 );    // MSB
}
void sleep(void)
{ 
  /* stop toggling the CLKIN pin input and drive the CLKIN pin Low */ 
  func_mode( LDC_MODE_STANDBY );
}
void wakeup(void) { 
  /* start toggling the clock input on the CLKIN pin */ 
  init(); 
//  delay(0.5); 
}

void init_LDC1101(void)
{
  /********* SETTINGS *****************
  ** C_sensor     =   120 pF
  ** L_sensor     =     5 uH
  ** Rp_min       =  1500 Ohm
  **
  ** RCount       = 65535     (max)
  ** Samplerate   =    1 kHz
  ** t_conv       =    1 ms
  **
  ** f_sensor_min =     6.4 MHz (d = inf)
  ** f_sensor_max =    10   MHz (d = 0)
  ** divider      =     1
  ************************************/
  
  
  // Set LDC1101 in configuration modus
  func_mode( LDC_MODE_STANDBY );     // STANDBY = 0x01 naar 0x0B  

  // - initialise LHR mode & enable SHUTDOWN mode
  setLHRmode();   // LHR mode
  // setRPmode(); // RP+L modek 
  
  // - set ResponseTime to 192
//  setResponseTime( LDC_RESPONSE_192 );
  
  // - set LHR_Rcount to highest resolution(LHR)
  setReferenceCount( _Rcount );
  
  // - set calibrated value for f_sensor_min (d = inf, no target)
//  set_fsensor_min(); // minimum 500kHz
  
  // - disable RP_MAX
  // - set RP_MIN to 1,5 kOhm (RPMIN_1)
  setRPsettings( 1, RPMAX_0, RPMIN_1 );   // LHR mode
  // setRPsettings( 0, RPMAX_96, RPMIN_1 );   // RP+L mode
  
  // - set Divider to 1 (for large range / ENOB / resolution)
  setDivider( DIVIDER_1 );  
  
  // - shift the signal down a bit
  setLHRoffset( 0x00 );
  
  // Done configuring settings, set LDC1101 in measuring modus
  func_mode( LDC_MODE_ACTIVE );
}

void LDC_Init()
{
    // Set LDC1101 in configuration modus
  func_mode( LDC_MODE_STANDBY );     // STANDBY = 0x01 naar 0x0B  
  
  writeSPI(0x36, LDC1101_CMD_RP);
  writeSPI(0xDD, LDC1101_CMD_TC1);
  writeSPI(0xFD, LDC1101_CMD_TC2);
  writeSPI(0xD7, LDC1101_CMD_DIGCONFIG);
      writeSPI(0x00, LDC1101_CMD_ALTCONFIG);
      writeSPI(0x00, LDC1101_CMD_THRESHILSB);
      writeSPI(0x00, LDC1101_CMD_THRESHIMSB);
      writeSPI(0x00, LDC1101_CMD_THRESLOLSB);
      writeSPI(0x00, LDC1101_CMD_THRESLOMSB);
      writeSPI(0x00, LDC1101_CMD_INTB_CONFIG);
      writeSPI(0x00, LDC1101_CMD_D_CONFIG);
      writeSPI(0x00, LDC1101_CMD_LTHRESHLSB);
      writeSPI(0x00, LDC1101_CMD_LTHRESHMSB);
      writeSPI(0x00, LDC1101_CMD_LTHRESLLSB);
      writeSPI(0x00, LDC1101_CMD_LTHRESLMSB);
                  writeSPI(0x68, LDC1101_CMD_STATUS);
      writeSPI(0x00, LDC1101_CMD_RP_DATA_LSB);
      writeSPI(0x00, LDC1101_CMD_RP_DATA_MSB);
      writeSPI(0x00, LDC1101_CMD_L_DATA_LSB);
      writeSPI(0x00, LDC1101_CMD_L_DATA_MSB);
                            writeSPI(0x29, LDC1101_CMD_LHR_RCOUNT_LSB); //0xFF
                            writeSPI(0x1F, LDC1101_CMD_LHR_RCOUNT_MSB); //0xFF
                            writeSPI(0x00, LDC1101_CMD_LHR_OFFSET_LSB);
                            writeSPI(0x00, LDC1101_CMD_LHR_OFFSET_MSB);
      writeSPI(0x00, LDC1101_CMD_LHR_CONFIG);
      writeSPI(0x00, LDC1101_CMD_LHR_DATA_LSB);
      writeSPI(0x00, LDC1101_CMD_LHR_DATA_MID);
      writeSPI(0x00, LDC1101_CMD_LHR_DATA_MSB);
  
  // Done configuring settings, set LDC1101 in measuring modus
  func_mode( LDC_MODE_ACTIVE ); 
  
}
float get_fsensor_min()
{
  uint8_t DIG_CONF;
  DIG_CONF = readSPI(0x04);   
  return (float) 8.0f/(16.0f - (float) ((DIG_CONF& 0xf0) >> 4));
}

bool is_New_LHR_data(void) 
{ 
  return(!(get_LHR_status() & 0x01)); 
}

bool is_Oscillation_Error(void)
{ 
  return(get_status() & 0x80); 
}

uint8_t get_status(void)
{
  uint8_t status;
  status = readSPI(0x20);   
  return status;
}

uint8_t get_LHR_status(void)
{
  static uint8_t LHR_status;
  LHR_status = readSPI(0x3B);
  
  // ERR_ZC:   (LHR_status & 0x10) >> 4   //
  // ERR_OR:   (LHR_status & 0x08) >> 3   // 
  // ERR_UR:   (LHR_status & 0x04) >> 2   // 1 = LHR_DATA < 0 because LHR_OFFSET > LHR_DATA
  // ERR_OF:   (LHR_status & 0x02) >> 1   // 
  // LHR_DRDY: (LHR_status & 0x01)        // 1 = Data ready
  
  return LHR_status;
}

//float get_Q(void)
//{ 
//  return _RPmin * sqrt(_cap/_inductance*1000000); 
//}  

float get_fsensor( uint32_t Ldata )
{
  static float _Ldata;
  _Ldata =(float)Ldata;
  // LHR mode
    if( Ldata == 0 ) { _Ldata = get_LHR_Data(); }            
  _fsensor = _fCLKIN * (float)_divider * (_Ldata + (float)_LHRoffset*256)/16777216;       // (p.26)
  
  // RP+L mode
  // if( Ldata == 0 ) { Ldata = get_L_Data(); }             
  // _fsensor = (_fCLKIN * 6144) / (3 * Ldata);       // (p.31)
  
  return _fsensor;
}


/* GETTING DATA FROM SENSOR-------------------------------------------------- */

uint16_t get_RP_Data(void)
{
  RP_DATA=0;
  
  LDC_CS_LOW;
  
  // address bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_SendData8(SPI1, 0x80 | 0x21);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  SPI_ReceiveData8(SPI1);
   // data bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_SendData8(SPI1, 0x00);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  RP_DATA += ((uint16_t)SPI_ReceiveData8(SPI1));

   // data bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_SendData8(SPI1, 0x80 | 0x22);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  RP_DATA += ((uint16_t)SPI_ReceiveData8(SPI1))<<8 ;


//  writeSPI(ADG);
  
  while( SPI1->SR & SPI_I2S_FLAG_BSY );
  
  LDC_CS_HIGH;
  
  return RP_DATA;
}

float get_RP( uint16_t RPdata )
{
  static float _rp;
//  if( RPdata == 0 ){
//    RPdata = get_RP_Data();
//  }
  _rp=_RPmin * (1.0f - ((float) RPdata / (65535.0f-1.0f)));
  //return (_RPmax * _RPmin) / ( _RPmax * (1.0f - ((float) RPdata / 65535.0f)) + _RPmin * ((float) RPdata / 65535.0f));
  return _rp;
}

uint32_t get_LHR_Data(void)
{
  LHR_DATA=0;
  
  LDC_CS_LOW;
  
  // address bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_I2S_SendData(SPI1, 0x80 | 0x38);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  SPI_I2S_ReceiveData(SPI1);
   // data bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_I2S_SendData(SPI1, 0x00);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  LHR_DATA += ((uint32_t)SPI_I2S_ReceiveData(SPI1));

   // data bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_I2S_SendData(SPI1, 0x80 | 0x39);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  LHR_DATA += ((uint32_t)SPI_I2S_ReceiveData(SPI1))<<8 ;

   // data bits
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
  SPI_I2S_SendData(SPI1, 0x80 | 0x3A);
  while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
  LHR_DATA += ((uint32_t)SPI_I2S_ReceiveData(SPI1))<<16 ;

//  writeSPI(ADG);
  
  while( SPI1->SR & SPI_I2S_FLAG_BSY );
  
  LDC_CS_HIGH;
  
  return LHR_DATA;
}


float get_Inductance( uint32_t Ldata )
{  
   static float _inductance;      // the calculated inductance
  
   
   _fsensor = get_fsensor( Ldata );
  _inductance = 1/(_cap * 4*PI*PI*_fsensor*_fsensor); // (p.34)
  
  
  return _inductance;
}

// Delay ms
void delay_a(uint32_t nCount) {
  uint32_t index = 0; 
  for(index = (nCount*1); index != 0; index--) ;
}

over 5 years ago

0 Kristin Jones93 over 5 years ago

TI__Genius 17440 points

Hello David,

I think this is much more likely a sensor problem than a software problem. Can you share your schematics? I especially need the values of the LC tank sensor.

Best Regards,

0 David Nguyen18 over 5 years ago in reply to Kristin Jones93

Prodigy 130 points

Dear Kristin

Here is the schematic I used for. In this schematic, i already removed L1 and L2, just connect directly Csensor1 to a coil sensor.

0 Kristin Jones93 over 5 years ago in reply to David Nguyen18

TI__Genius 17440 points

Hi David,

Please clarify the inductance of your coil sensor.

Best Regards,

0 David Nguyen18 over 5 years ago in reply to Kristin Jones93

Prodigy 130 points

Dear Kristin,

I have changed the configuration as follows:

fsensor desired = 1MHz

Lsensor = 28.5uH (measured at 1MHz from LCR meter)

Csensor = 820pF(closest value to 888.78uF according to the datasheet equation F = 1/2*pi*square root(LC) )

The result is as detail in the below figure.

The frequency seems to be unchanged. however, the waveform is changed.

0 David Nguyen18 over 5 years ago in reply to David Nguyen18

Prodigy 130 points

This is my coil sensor

0 Kristin Jones93 over 5 years ago in reply to David Nguyen18

TI__Genius 17440 points

Hi David,

It looks like there are wires connecting your coil to the rest of the board. How long are they? Especially at high frequencies (>1MHz), there is a limit to the distance that the coil can be separated from the LDC. The LDC is unable to drive the sensor effectively if the wires are too long.

Regards,

0 David Nguyen18 over 5 years ago in reply to Kristin Jones93

Prodigy 130 points

Dear Kristin,

Thank you so much for your best support,

i found the error and fixed it correctly. The problem may cause from wire connection.

I used the shorter wire and the waveform already return to good shape.

Here is the output waveform for my application.

This discussion could be wrapped up and finished here.

Best regards,

David Nguyen,

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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LDC1101: waveform configuration