PCB Top with components.
PCB Bottom with components.

1 About

The Beta Power Board sits between the Beta Main Board and the MicroZed™ in the cameras PCB stack. It generates all the different supply voltages for the chips and logic on the other PCB’s inside the camera. It also monitors currents so that it can estimate remaining power based on the recorded consumption. Version 1 of the Beta Power Board has the 8 different voltage rails calibrated at factory. In case of a future hardware upgrade that require any power rail to have a different reference voltage this calibration needs to be redone.

2 Planned Changes for V2

  • DC barrel connector attached directly to the PB with a cable
  • mechanical trimmer (discontinued) replacement -> switching regulators with digital voltage control
  • PICO SPOX power input connector will be moved "into" the PB so the cable can be routed inside the camera enclosure towards the backside
  • RGB LED and pushbutton (ALPS SKSNLAE010 currently considered) moved from smart power adapter to PB (top side, north east)


3 Revisions

Current: AXIOM Beta Power Board v0.30




Archive:

AXIOM Beta Power Board v0.25

axiom beta power board v0.23

axiom beta power board v0.22 test

axiom beta power board v0.17 test

axiom beta power board v0.11 test

axiom beta power board v0.8 test

axiom beta power board v0.9 test


4 Calibrating Voltages

This describes the process required when factory assembling the power board hardware in the AXIOM Beta stack.


./power_init.sh
./power_on.sh

wait a bit

./pac1720_info.sh

This will output something like:

ZED_5V          4.8828 V [1f40]         +10.1562 mV [104]   +677.08 mA
BETA_5V         4.8828 V [1f40]          +1.2891 mV [021]    +85.94 mA
HDN             3.2812 V [1500]          +0.0000 mV [000]     +0.00 mA
PCIE_N_V        3.2422 V [14c0]          +0.0000 mV [000]     +0.00 mA
HDS             3.2031 V [1480]          +0.0000 mV [000]     +0.00 mA
PCIE_S_V        3.2422 V [14c0]          +0.0000 mV [000]     +0.00 mA
RFW_V           3.2422 V [14c0]          -0.0391 mV [fff]     -2.60 mA
IOW_V           3.2617 V [14e0]          +0.0000 mV [000]     +0.00 mA
RFE_V           3.2422 V [14c0]          +0.0000 mV [000]     +0.00 mA
IOE_V           3.2812 V [1500]          +0.0000 mV [000]     +0.00 mA
VCCO_35         2.4219 V [ f80]          -0.0391 mV [fff]     -2.60 mA
VCCO_13         2.4609 V [ fc0]          +0.0000 mV [000]     +0.00 mA
PCIE_IO         2.4609 V [ fc0]          -0.0781 mV [ffe]     -5.21 mA
VCCO_34         2.4609 V [ fc0]          +0.9766 mV [019]    +65.10 mA
W_VW            2.7734 V [11c0]          +0.0000 mV [000]     +0.00 mA
N_VW            2.8125 V [1200]          +0.0000 mV [000]     +0.00 mA
N_VN            2.7734 V [11c0]          -0.0391 mV [fff]     -2.60 mA
N_VE            2.8516 V [1240]          +0.0000 mV [000]     +0.00 mA
E_VE            2.6953 V [1140]          -0.0391 mV [fff]     -2.60 mA
S_VE            2.8516 V [1240]          +0.0000 mV [000]     +0.00 mA
S_VS            2.7344 V [1180]          -0.0391 mV [fff]     -2.60 mA
S_VW            2.8516 V [1240]          -0.0781 mV [ffe]     -5.21 mA

now run:

watch -n 0.2 ./pac1720_info.sh

which will display the voltages in a clear screen and constantly update the values until you press CTRL+C

The PCB labels and the labels in the CLI correspond like the following:

WW = W_VW
NW = N_VW
NN = N_VN
NE = N_VE
SW = S_VW
SS = S_VS
SE = S_VE
EE = E_VE

Use a tiny screwdriver and adjust the trimmers on the PCB until your values look like this:

W_VW          	2.4609 V [ fc0] 	 -0.0391 mV [fff]     -2.60 mA
N_VW          	3.2422 V [14c0] 	 +0.0000 mV [000]     +0.00 mA
N_VN          	1.8750 V [ c00] 	 -0.0391 mV [fff]     -2.60 mA
N_VE          	3.2617 V [14e0] 	 +0.0000 mV [000]     +0.00 mA
E_VE          	3.2812 V [1500] 	 +0.0391 mV [001]     +2.60 mA
S_VE          	1.9922 V [ cc0] 	 +0.0000 mV [000]     +0.00 mA
S_VS          	2.9883 V [1320] 	 -0.0391 mV [fff]     -2.60 mA
S_VW          	1.9531 V [ c80] 	 -0.1172 mV [ffd]     -7.81 mA




AXIOM Beta is a professional digital cinema camera built around FOSS and open hardware licenses.

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