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About Lunar
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03-11-2020
06-01-2021
Lunar
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03-12-2020
06:18 PM
It's interesting that the register map dump is showing "skipped measurements". I'll look into this and try and share more valuable information to you from this sensor. The data that I gathered for you was indeed using single-byte reads but this is not how we program our units. We use burst reads but for debugging purposes, we are using single-byte reads. From what I have noticed, all the non-working sensors are capped and giving constant 0xFF while the sensors are powered. Majority of the sensors are seeing failures from the initial start up, but a few were working as expected then went down over certain duration of time. Our units are manufactored in a mass manufactoring facility and we provided them the HSMI manual to ensure it is being followed. I would like to highlight the key points I have found and ensure I didn't miss any with you so I can start a converation with them and ensuring these instructions are being followed. Ignoring the placement details which we confirmed are being followed, the instructions are as follows: Solder must be Pb free with peak temperature of 260 C for 20-40 seconds and no more. The minimum height of the solder after reflow should be at least 50 um. Avoid excess solder paste Do not use any liquids of any kind around the sensor (flux, cleaning agents, air-pistol, etc.) unless protective actions are taken around the vent hole of the sensor Max of only three reflow cycles Reconditioning procedure is mandatory when the sensor is exposed to conditions that exceed the limits in accordance to the datasheet (e.g reflow). Dry-Bake: 120 C at <5% rH for 2 hours or N/A (reflow only) 70 C at 75% rH for 6 hours or 25 C at 75% rH for 24 hours or ~25 C at >40% rH for >5 days (reflow only) 1 hour at room temperature or N/A (reflow only) Vapor phasing soldering must be avoided Are there any main instructions that I missed? Are there any other procedures we can conduct with the working/non-working sensors as we talk to our manufactoring team to determine if something else is occuring?
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- BME280
03-11-2020
05:21 PM
We are integrating the BME280 into our units and have noticed several invalid values being obtained from the BME280 registers. We have roughly 200 units created and about 30-40 of these units have BME280 that are reading invalid data. This following is the serial output from our microcontroller reading the BME280 on a working sensor: Displaying ID, reset and ctrl regs ID(0xD0): 0x60 Reset register(0xE0): 0x0 ctrl_meas(0xF4): 0xB7 ctrl_hum(0xF2): 0x5 Displaying all regs 0x80:AD 71 89 53 2C 19 5E 06 16 6D 33 67 32 00 E8 8C 0x90:71 D6 D0 0B 31 1B 62 00 F9 FF 0C 30 20 D1 88 13 0xA0:00 4B 86 00 00 00 00 00 00 00 00 00 33 00 00 C0 0xB0:00 54 00 00 00 00 60 02 00 01 FF FF 1F 4E 08 00 0xC0:08 40 B7 FF 00 00 00 00 05 00 00 00 00 00 00 00 0xD0:60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0xE0:00 48 01 00 19 2C 03 1E DB 41 FF FF FF FF FF FF 0xF0:FF 00 05 0C B7 10 00 80 00 00 80 00 00 80 00 80 Displaying concatenated calibration words dig_T1, uint16: 27926 dig_T2, int16: 26419 dig_T3, int16: 50 dig_P1, uint16: 36072 dig_P2, int16: -10639 dig_P3, int16: 3024 dig_P4, int16: 6961 dig_P5, int16: 98 dig_P6, int16: -7 dig_P7, int16: 12300 dig_P8, int16: -12000 dig_P9, int16: 5000 dig_H1, uint8: 75 dig_H2, int16: 328 dig_H3, uint8: 0 dig_H4, int16: 412 dig_H5, int16: 50 dig_H6, uint8: 30 Temperature: 24.40 degrees C Temperature: 75.92 degrees F Pressure: 71354.62 Pa Altitude: 2959.04m Altitude: 9708.12ft %RH: 31.83 % This following is the serial output from our microcontroller reading the BME280 on a non-working sensor: Displaying ID, reset and ctrl regs ID(0xD0): 0x60 Reset register(0xE0): 0x0 ctrl_meas(0xF4): 0xB7 ctrl_hum(0xF2): 0x5 Displaying all regs 0x80:94 50 89 10 58 30 9C 06 C8 6F 85 69 32 00 FD 8B 0x90:9B D7 D0 0B C2 19 35 00 F9 FF AC 26 0A D8 BD 10 0xA0:00 4B FB 00 00 00 00 00 00 00 00 00 33 00 00 C0 0xB0:00 54 00 00 00 00 60 02 00 01 FF FF 1F 4E 08 00 0xC0:08 40 B7 FF 00 00 00 00 05 00 00 00 00 00 00 00 0xD0:60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0xE0:00 73 01 00 12 29 03 1E 00 41 FF FF FF FF FF FF 0xF0:FF 00 05 0C B7 10 00 FF FF C0 FF FF C0 FF FF 80 Displaying concatenated calibration words dig_T1, uint16: 28616 dig_T2, int16: 27013 dig_T3, int16: 50 dig_P1, uint16: 35837 dig_P2, int16: -10341 dig_P3, int16: 3024 dig_P4, int16: 6594 dig_P5, int16: 53 dig_P6, int16: -7 dig_P7, int16: 9900 dig_P8, int16: -10230 dig_P9, int16: 4285 dig_H1, uint8: 75 dig_H2, int16: 371 dig_H3, uint8: 0 dig_H4, int16: 297 dig_H5, int16: 50 dig_H6, uint8: 30 Temperature: 190.42 degrees C Temperature: 374.76 degrees F Pressure: -21802.65 Pa Altitude: nanm Altitude: nanft %RH: 100.00 % Temperature: 190.42 degrees C Temperature: 374.76 degrees F Pressure: -21802.65 Pa Altitude: nanm Altitude: nanft %RH: 100.00 % I have attached some oscilliscope images of the I2C lines from both sensors at the bottom of the post. Images 1-4 corresponds to the non-working sensor while 5-8 corresponds to the working sensor. According to the oscilliscope, we are send the correct/valid messages to the sensor in accordance to the BME280 datasheet and the sensor is holding/reporting invalid data from its registers. We would like to know why some of these sensors are working and others sensors are not. Is this a known issue? Non-Working 1 Non-Working 2 Non-Working 3 Non-Working 4 Working 1 Working 2 Working 3 Working 4
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- Tags:
- BME280
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