Questions about the PinePhone component list

[amosbatto]

I have compiled a list of the components in the PinePhone v1.2a by looking at the schematic:

https://wiki.pine64.org/index.php?title=...onent_list

However, I have several questions, and maybe someone here can answer them.

What do the abbreviations DU, ED and FB mean when they are used to identify components?

• DU : "U" is for an integrated circuit, but not sure what the "D" means. (e.g. DU1)
  
• ED : "D" is for a diode, but not sure what "E" means. (e.g. ED600)
  
• FB : ? (e.g. FB804, FB805)
  

Also, I see 2 accelerometers/gyroscopes on page 12 of the schematic:

• U1202: TDK InvenSense MPU6050 six-axis, low-power MEMS gyroscope and accelerometer, QFN-24 4x4x0.9 mm [datasheet]
  
• U1204: Bosch Sensortek BMI120 3-axis gyroscope and accelerometer, LGA-14 2.5x3.0x0.83 mm
  

Note: Listed as “NC/BMI120”, where “NC” probably means “not connected”, so there may be circuits in the PCB for the part, but it is not placed on the board. This is probably an alternative to the MPU6050.

It looks like the Bosch part is not placed on the board, however, it looks like there are two magnetometers in the Pinephone and I can't figure out why:

• U1200: STmicroelectronics LIS3MDL ultra-low-power three-axis magnetometer, LGA-12 2.0x2.0x1.0 mm [datasheet]
  
  
• U1203: Asahi Kasei Microdevices (AKM) AK09911 3-axis electronic compass IC with Hall sensor, 8-pin WL-CSP (BGA), 1.2×1.2×0.5 mm
  or
  
• U1203: Voltafield Technology Corp. (VTC) AF8133J 3-axis electronic compass with proprietary anisotropic magneto resistive (AMR) technology, 8-pin WLCSP 1.2x1.2x0.5 mm
  

Note: Both parts are listed, so have to check the PCB to see which was used. It is not clear why this part is needed when the device already has the LIS3MDL.

Can someone please check on their PinePhone whether there are really two magnetometers and which models are being used.


Another question is whether the schematic for the Pine64 doesn't include all the circuits. I noticed that the schematic for the Librem 5 has twice as many parts as the PinePhone and has a lot more detail. I have compiled a list of the parts in the Librem 5 and the difference is noticeable:
https://source.puri.sm/Librem5/community...onent-list

Is the schematic for the  PinePhone complete or did Pine64 leave out some of the circuits?