Ublox IRIS-W10 Series, User Manual

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EVK-IRIS-W10 - User guide
UBX-23007837 - R03 Hardware description Page 15 of 43
C1-Public
3.1.3 Current measurement
The evaluation board provides two current-sensing headers, as shown in Figure 14.
•
J7 for current measurement of the VDD module supply
•
J67 for current measurement of the VDD-IO module supply
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 ( > 1R0 is recommended ), J97, and J96
respectively, as shown in Figure 12 and Figure 13. The third pin on J7 and J67 are connected
to GND . The VDD and VDD-IO module supplies are sourced through the resistors shown in
Figure 12 and Figure 13 . To measure current consumption, use a multimeter or other precise
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 Figure 15.
Some Click boards need different RESET signals, and mikroBUS slots have extra independent
configurable RESETn/RESET options through GPIO50 . See also mikroBUS slots .
Figure 15: EVK schematic, RESETn button
+3V3 VDD
Module Current Measurement
+3V3
Module IO Current Measurement
1 2 3
J67
1 2 3
J7
VDD-IO
J95
J94