Open-Q™ 820 (APQ8096) / 820Pro (APQ8096SG) µSOM Development Kit User Guide Version 1.4
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Copyright Intrinsyc Technologies Corporation
3.8.5 Power Probe Header J86
Figure 7 J86 Power Probe Header
The power probe header is used to sense/ monitor the current on the 3.8V power rail going
into the µSOM. The table below summarizes the pin outs of header J86.
Description
Signal
Pin
µSOM power positive current sense line
µSOM_PWR_SENSE_P
J86[1]
µSOM power negative current sense line
µSOM_PWR_SENSE_N
J86[2]
GND
GND
J86[3]
3.8.6 Debug Serial UART Header J61
Figure 8 J61 3.3V TTL Debug UART
The UART header and supporting circuitry does not come preinstalled. To have access to
the debug UART, a 3-pin header needs to be installed as well as the supporting circuitry.
Please see page 17 of the µSOM carrier board schematic for details on what to install for
this header to be functional.
The header consists of TX, RX and GND pins. This is a 3.3V TTL UART header. To get the
serial terminal working with a PC, the following cable (or similar) is needed
http://www.digikey.ca/product-detail/en/TTL-232R-RPI/768-1204-ND/4382044
Description
Signal
Pin
FTDI RPI cable
connection
APQ UART RX (GPIO5)
BLSP8_UART_RX
J61[1]
Orange
APQ UART TX (GPIO4)
BLSP8_UART_TX
J61[2]
Yellow
GND
GND
J61[3]
Black
