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

Hi all,

I am using a si1141 sensor on a custom PCB with the sensor driven from a PIC. The application has been live for about 4 months and we currently have around 3 million operating hours from these boards. I am occasionally seeing the sensor become unresponsive which manifests itself as all messages coming back from the sensor to the PIC as zeros only. 

I have around 3,500 devices operating at the moment and around 1 to 2% of them are going into this mode. It seems that it can only be recovered by a hard reset of the sensor.  

Has anyone else seen anything like this? Obviously I can provide more details of the application etc but I don't want to swamp the thread with useless information if no-one else has seen this. 

Any help or insight would be very gratefully received!

Paul

Hi,

I can't get this software tool to work with both, my IRMFB-EB and IRSLIDER2EK evaluation kit. The problem is that when I click on "view waveform" I don't see anything to happen. We have tried it on several computers.

The documentation is telling me that I need the "Si114x performance analysis tool", but where can I find it?

What can be wrong here....?

Thanks.

Hi,

       The "sw_op" described in the Si7060 datasheet is a 9 bit number, but in the "Register Interface" description section, you can only see that the bit6-bit 0 of 0xC6 is "sw_op." Where are the other two bits?

Can someone show me the spectral responce of the UV sensor? In the data sheet *) (version 0.91) section 3.2 UV index sensing:

"The UV Index is a number linearly related to the intensity of sunlight reaching the earth and is weighted according to the CIE erythemaAction Spectrum"

That is a general explanation about UV-index, but does not give the spectral responce of the sensor.

I'm special interested in the responce in the range of UV-A and UV-B 290-400 nm.

With kind regards

Jan (John)

*) Note: data sheet

Hi Silabs,

I have a few questions about the SI1172. Many thanks.

1、The SI1172 has two pins, LA and RA, for measuring ECG. Must I measure both my wrist and my fingers? Can a single wrist measure ECG?

2、What is the purpose of heart rate detection to increase the acceleration sensor?

3、Which MCU is the officially provided algorithm based on?

Hello,

I am using nRF52832 with the BLE application to read the Si7021 sensor. The problem I encountered was that after starting the softdevice, turning Si7021 on and off caused nRF52832 to be restarted. So please tell me, what do things for SCL and SDA when booting Si7021?

My design:

Many thanks

Hi ,

I have used the SI1133(slave) with LPC1765(Master) for detecting IR.But i have received the data's with the delay of 320us in the initial stage .After some milliseconds it goes to 520us as I attached here.

I think this is happened due to I2C clock Stretching.Kindly give a idea to reduce it if possible.   

Hi!

Already asked a question in the topic:  how to shine with an IR photodiode for a long time. So you can see the light with the camera. Is it possible to do so? Is it possible to control the LED using registers?

Sensor si1141-A11.

Hi,

What impedance will the LED pins have when the circuit is powered down?

More precise, if Si115x is powered from an regulated power domain (which could be turned off) while the IR-LED is powered directly from the battery.
What happens with the LED input on the Si115x if the power supply to the circuit is shut of when the IR-LED still is powered from the battery.
Is there a risk for current leakage through the LED that eventually could drain the battery, if so how large would that leakage be.
Or is the design of the current sink regulator done so that a high impedance is guaranteed?
In this situation is it recommended to have the pull-up resistors connected to the regulated power domain which Si115x is powered from or is there any reason to have the resistors connected directly to the battery together vid the LED?

Best Regard
Lars

HI all,

I cannot find any document about timing reflow soldering for Si7021. Can you show me any document ?

Thanks,

Hi Silabs,

Gesture recognition using SI1153, the top of the chip will be covered with a 4mm glass cover. I hope the recognition distance is between 20mm~30mm.

Are there any suggestions for the following questions? Many thanks.

1. How should the external irLED be placed? What is the range of distance from the irLED to the SI1153?  What is the minimum? What is the maximum?

2.What is the appropriate distance between the 4mm glass above the chip and the SI1153 distance?

我目前正在使用si1133传感器，首先我想请问一下si1133传感器是否可以根据采集到的数据计算得出紫外线强度值(我需要的不是紫外线指数uvi，而是紫外线强度值)。

另外我已经参考论坛中的其它回答，采集到了传感器输出值，但是采集到的值是-2, 0, 1, 2, 3类似的值，请问我得到的采集值是否正确呢？

下面是我的一些代码，谢谢！

uint8_t si1133_init(void)
{
    uint32_t ret;

    /* Enable power to the sensor */
    // BOARD_envSensEnable( true );

    /* Allow some time for the part to power up */
    HAL_Delay(5);

    ret = si1133_reset();

    HAL_Delay(10);

    ret += si1133_param_set(SI1133_PARAM_CH_LIST, 0x01);
    ret += si1133_param_set(SI1133_PARAM_ADCCONFIG0, 0x78);
    ret += si1133_param_set(SI1133_PARAM_ADCSENS0, 0x09);
    ret += si1133_param_set(SI1133_PARAM_ADCPOST0, 0x40);
    
    if (0 != ret)
    {
        return 1;
    }
    
    return 0;
}

static uint8_t si1133_measurement_force(void)
{

   return si1133_send_cmd(SI1133_CMD_FORCE_CH);

}

int32_t SI1133_readUV() 
{
    int ret = -1;
    uint8_t temp;
    uint8_t temp2;
    uint8_t temp3;
    int32_t temp_full;
    
    ret = si1133_measurement_force();
    if (1 == ret)
    {
        return 1;
    }
   
    si1133_register_read(SI1133_REG_HOSTOUT0, &temp);
    si1133_register_read(SI1133_REG_HOSTOUT1, &temp2);
    si1133_register_read(SI1133_REG_HOSTOUT2, &temp3);

    temp_full = (int8_t) temp3 | ((int8_t) temp2<<8) | ((int8_t) temp<<16);
     
    HAL_Delay(300);
    
    return temp_full;       // 这里得到的返回值是-2, 0, 1, 2, 3类似的值
}

I am trying to find the only expansion board, but I am only finding it with as a pair of other boards,(I want this expansion board separately)

where can I find the following board, this expansion board attached to WSTK