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3.1.3
Current measurement
The evaluation board provides two current-sensing headers, as shown in
•
J7 for current measurement of the VDD module supply
•
J67 for current measurement of the VDD-IO module supply
Module Current Measurement
+3V3
J94
J7
Figure 14: VDD and VDD-IO current sensing configuration
Two consecutive pins on Each 2.54 mm pitch 3-pin headers are connected across a 0R, which
can be replaced by a current-sense resistor (
respectively, as shown in
to GND. The VDD and VDD-IO module supplies are sourced through the resistors shown in
Figure 12
and
Figure
voltage measurement device and measure the voltage drop across pins 2 and 3. If the current
sensor is removed from the circuit, current can also be measured directly by opening J97 or
J96. Use an ammeter in series with the two voltage pins.
If VDD-IO is supplied by +1V8 or +VPA, R126 can be replaced by a current-sense resistor.
⚠
Pin 1 of J7 and J67 is connected to GND.
To bypass the current sense resistors, R35 and R62, solder the respective jumpers J94 and
J95.
The default hardware configuration doesn't require any modification of the current-sense
headers for the EVK-IRIS-W10 to perform properly.
3.2 Reset
The active-low reset signal, RESETn, is connected to the module PDn pin, the FTDI reset pin,
the four mikroBUS slots, and a momentary button switch (SW5), as shown in
Some Click boards need different RESET signals, and mikroBUS slots have extra independent
configurable RESETn/RESET options through GPIO50. See also
Figure 15: EVK schematic, RESETn button
UBX-23007837 - R03
C1-Public
Module IO Current Measurement
VDD
+3V3
Figure 12
and
Figure 13.
13. To measure current consumption, use a multimeter or other precise
VDD-IO
J95
J67
> 1R0 is recommended
The third pin on J7 and J67 are connected
Hardware description
EVK-IRIS-W10 - User guide
Figure 14.
), J97, and J96
Figure 15.
mikroBUS
slots.
Page 15 of 43
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