Open-Q™ 624A Development Kit
Open-Q™ 624A Development Kit User Kit
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3.8.7 Power Probe Header J86
Figure 9 J86 Power Probe Header
The power probe header is used to sense/monitor the current on the 3.9V power rail going into the SOM
(SOM_SYS_PWR). The table below summarizes the pin outs of header J86. A 0.005 Ohm sense resistor is
connected between Pins 1 and 2. Refer to schematic for more details.
Table 3-6 Power Header J86 Pin-out
Description
Signal
Pin #
SOM power positive current sense
line
SOM_PWR_SENSE_P
J86[1]
SOM power negative current sense
line
SOM_PWR_SENSE_N
J86[2]
GND
GND
J86[3]
The SOM power consumption can be calculated with the formula below (where Rsense = 5 milliohms):
𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃
=
𝑉𝑉𝑃𝑃𝑃𝑃𝑃𝑃
𝑝𝑝𝑝𝑝𝑟𝑟
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑁𝑁
∗
(
𝑉𝑉𝑃𝑃𝑃𝑃𝑃𝑃
𝑝𝑝𝑝𝑝𝑟𝑟
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑃𝑃
− 𝑉𝑉𝑃𝑃𝑃𝑃𝑃𝑃
𝑝𝑝𝑝𝑝𝑟𝑟
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑁𝑁
)
𝑅𝑅𝑃𝑃𝑅𝑅𝑅𝑅𝑃𝑃𝑅𝑅
3.8.8 Power Header via 20 Pin Connector J60
Figure 10 J60 Power Connector
•
For providing camera connectors with additional current than what is originally supported by on board
regulators.
