Can anyone give me more specific documents about Si117x HRM algorithm?

It's better about the detail of Si117x HRM algorith.

I need it so much.

Thanks.

How to use TWI xfer of TXRX?

Thanks!

Hi,now I'am use 0x70,but it can't read or write to si1175 heart rate sensor.

So,can anyone tell me the i2c address?

Thanks.

Hi,

I have a Si7211 in a TO-92 package (Si7211-B-00-IBR to be exact) wired to 3.3 V  that outputs a constant ~0.9V signal that doesn't change when I wave a magnet close to it. The current consumption is around 22 mA and that does seem to have a few uA variation in response to the magnet though. I tested another unit and it's exactly the same, even when I up the supply to 5 V.

Any ideas why the voltage isn't responding?

(FYI the TO-92 package has Si72B2Z0 on it)

Thanks.

Regards,

Roger

I use the Si1153 Sensor for Light Intensity detection (visible light). I use the 23 Bit Mode and the I2C does work. My Problem:

When increasing the Light Intensity the Sensor Si1153 works well up to a Value approximently of 32000. After this Value the Value jump to 8.388.607 (7F FFFF HEX) (Light Intensity change low). The Range between is lost. There is no linearity of the deteced Values.

Hardware Informations:

PIN 6, PIN 7 and PIN 9 -> Pullup Resistor

I don´t use the INT Pin.

Software Informations:

   ud_Si1153Cfg.u32 = 0;
    
    ud_Si1153Cfg.ADCMUX = 0b01101;
    ud_Si1153Cfg.DECIM_RATE = 2;
    ud_Si1153Cfg.HSIG = 0;
    ud_Si1153Cfg.SWGAIN = 0;
    ud_Si1153Cfg.HWGAIN = 3;
    ud_Si1153Cfg.BIT24OUT = 1;
    ud_Si1153Cfg.POSTSHIFT = 0;
    ud_Si1153Cfg.CNT_INDEX = 1;

We were wondering, if it is possible to run a temperature measurement in no-hold mode, and read back the result after some time. So instead of waiting for the Sensor to ACK the slave-address, we would simply like to wait for ~15ms and read back the result by issuing a read from the device.

Can you tell, if that is possible?

• The datasheet mentions that “Prolonged exposure to high humidity will result in a gradual upward drift of the RH reading”.
  • What is defined as being “high humidity”?
• Also in section 4.6. Bake/Hydrate Procedure there is mention of extremes of temperature and/or humidity resulting in high or low RH readings.
  • Do you have any data on what temperatures and RH levels are deemed extreme?
  • Is there a known relationship between extreme conditions and the magnitude of the sensor error, i.e. how much drift can we expect for a given time at a given RH?
• I am are particularly interested in what lower level of RH would cause the sensor to drift low; by how much and how long it would take to recover.

Hi there,

 I am using the example code found here https://os.mbed.com/teams/SiliconLabs/code/Si1133/rev/ to run the Si1133. I noticed they had already set the parameters for the Large White and Medium IR photodiodes as seen below:

    retval += set_parameter(PARAM_ADCCONFIG0, 0x78);
    retval += set_parameter(PARAM_ADCSENS0, 0x71);
    retval += set_parameter(PARAM_ADCPOST0, 0x40);
    retval += set_parameter(PARAM_ADCCONFIG1, 0x4d);
    retval += set_parameter(PARAM_ADCSENS1, 0xe1);
    retval += set_parameter(PARAM_ADCPOST1, 0x40);
    retval += set_parameter(PARAM_ADCCONFIG2, 0x41);
    retval += set_parameter(PARAM_ADCSENS2, 0xe1);
    retval += set_parameter(PARAM_ADCPOST2, 0x50);
    retval += set_parameter(PARAM_ADCCONFIG3, 0x4d);
    retval += set_parameter(PARAM_ADCSENS3, 0x87);
    retval += set_parameter(PARAM_ADCPOST3, 0x40);

I would like to turn on 5 channels for small IR, medium IR, large IR, white and large white but I do not know what to set the ADCSENS for each diode. Is there more information on how to set the SW gain and HW gain? I do not understand how the reference code chooses their values to best optimize for noise and performance. I noticed that they chose two large IR but their ADCSENS value is different, one just takes 1 measurement and the other takes 64. Can I keep the ADCSENS the same for all the 5 channels or should I set each different. Any suggestions would be very helpful. Thank you. 

Hi there,

I managed to get the Si1133 to work with the example code found here https://os.mbed.com/teams/SiliconLabs/code/Si1133/rev/

However when I try to force measurements from the Si1133 every 1 second, even 3 seconds, the ALS stops updating its latest data after 20-30 seconds. I found out that the program hangs while waiting for REG_IRQ_STATUS register to signal that the channel measurements are completed; specifically line 838:

    /* Check if the measurement finished, if not then wait */
    retval += read_register(REG_IRQ_STATUS, &response);
    while ( response != 0x0F ) {
        wait_ms(5);
        retval += read_register(REG_IRQ_STATUS, &response);
    }

Is this because I am forcing a measurement too quick? When I force measurements every 10 seconds the REG_IRQ_STATUS register does change after the measurement is finished and the program takes longer to hang but it still does eventually. How fast can we poll for a measurement? Our applications requires us to make an ALS reading every 1-2 seconds. How can we go about this?  Is there a work around for this? Thanks in advance for your help!

Hello,

We are going to work on one project. Main aim of the project is as below.

Aim:

• Need to detect reflective spot.
• device will be battery operated so we can not put device continuously in "ON(Active)" condition.
• We may need IR transceiver for this application as we need to detect only reflective spot.

I have gone through all sensor and found that Si1153 may help be helpful to me.

Also, provide answer of below questions:

1. Does it include inbuilt IR LED?
2. What is the Production Life of Si1153? Digi-Key is showing End of Life.
3. Provide details of attached image. We need all data to calculate battery life.

Need your help.

Where can i find information about the exact position off the Hall-element in the SOT23- or DFN-package?

Kind regards

I was just playing around with the si7057 and wrote functions for reading electronic ID and Temperature and also wanted to check the returned CRCs. At first I was quite confused, because whatever I tried, I never got the correct crc calculated. In the datasheet an initial value of 0xfc is given.

Then I tried different initial values and found out, that for EID a initial value of 0x00 must be used to get the correct CRC.

  uint8_t rxBuf[8];
  uint8_t crcCalc[6] = { 0 };
  uint8_t crcRead[6] = { 0 };

  // SNA
  SI705Y_Cmd(SI705Y_READ_ID1, 2, rxBuf, 8);

  crcRead[0] = rxBuf[1];
  crcRead[1] = rxBuf[3];
  crcRead[2] = rxBuf[5];
  crcRead[3] = rxBuf[7];

  crcCalc[0] = Crc8_add(rxBuf[0], crcCalc[0]);
  crcCalc[1] = Crc8_add(rxBuf[2], crcCalc[0]);
  crcCalc[2] = Crc8_add(rxBuf[4], crcCalc[1]);
  crcCalc[3] = Crc8_add(rxBuf[6], crcCalc[2]);

  // SNB
  SI705Y_Cmd(SI705Y_READ_ID2, 2, rxBuf, 6);

  crcRead[4] = rxBuf[2];
  crcRead[5] = rxBuf[5];

  crcCalc[4] = Crc8(rxBuf + 0, 2, crcCalc[4]);
  crcCalc[5] = Crc8(rxBuf + 3, 2, crcCalc[4]);

But when I want to read the temperautre and have the crc checked, I need to use a initial value of 0xff.

  uint8_t rxBuf[3];
  uint8_t crcRead;
  uint8_t crcCalc;

  SI705Y_Cmd(0, 0, rxBuf, 3);
  crcRead = rxBuf[2];
  crcCalc = Crc8(rxBuf, 2, 0xff);

/**
 * add a single byte to crc calculation.
 *
 * @param data byte to add to crc calc.
 * @param crc previous crc value
 * @return calculated crc value
 */
static uint8_t Crc8_add(uint8_t data, uint8_t crc)
{
  crc ^= data;
  for (int8_t j = 8u; j > 0u; j--)
  {
    if (crc & 0x80u)
      crc = (crc << 1u) ^ 0x131u;
    else
      crc = (crc << 1u);
  }
  return crc;
}

/**
 * Calculate CRC of temperature sensor data.
 * According to si7057, the initial value has to be set to
 * 0xfc.
 * Although, to get a correct crc calculation for measurements,
 * the initial has to be set to 0xff.
 * For ElectronicID reads, the initial has to be 0x00.
 *
 * @param data bytes to calculate crc over
 * @param length amount of bytes in data buffer
 * @param crc initial value for crc
 * @return calculated crc value
 */
static uint8_t Crc8(uint8_t *data, uint8_t length, uint8_t crc)
{
  uint8_t i;

  for (i = 0; i < length; i++)
    crc = Crc8_add(data[i], crc);

  return crc;
}

I hope, this will help someone.