Coin Cell Battery Holder B300 (30); Figure 5. Som Current Sense Header J301 (5); Table 6 - Power Header J301 Pinout - Intrinsyc Open-Q 845 mSOM User Manual

Open-Q™ 845 µSOM Development Kit User Guide
The table below summarizes the pin outs of header J301
Pin No
1
2
3
To obtain power consumption measurements, the header is connected to a data acquisition unit
(Keithley 2701 or similar) and the voltages on the SOM_PWR_SENSE_P/N pins are captured a few
times a second over the test period (typically 30 minutes). The SOM power consumption is then
calculated as (where Rsense = 5 milliohms):
���������������� = ����������������
Use averaging to reduce noise.

3.7.5 Coin Cell Battery Holder B300 (30)

The coin cell holder allows the user to use a coin cell for supplying power to the SOM VCOIN
power input. It is recommended that the Panasonic ML621 series rechargeable coin cell be used (not
supplied with the development kit). See item 30 in Figure 1 for the coin cell battery holder location
on the 845 carrier board.
© Copyright Intrinsyc Technologies Corporation

Figure 5. SOM Current Sense Header J301 (5)

Table 6 - Power Header J301 Pinout

Signal
SOM_PWR_SENSE_P
SOM_PWR_SENSE_N
GND
������������
���� ���������������� ����
Description
SOM power positive current sense line
SOM power negative current sense line
System Ground
(���������������� − ����������������
∗
������������
���� ���������������� ���� ������������������������
Version 1.0
)
������������
���� ���������������� ����
19 of 30