Ublox IRIS-W10 Series, Руководство пользователя

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EVK-IRIS-W10 - User guide
UBX-23007837 - R03 Hardware description Page 13 of 43
C1-Public
3.1.1.2
3.3 V Linear regulator (U20)
In Figure 9 , U20 (NCP692MN33T2G is intended to supply power to the MCU-LINK chip with
minimum interference to the IRIS-W10 radio module.
Figure 9: 3.3V linear regulator (U20)
Resistors
R151, R144
, and
R288
must be populated with
0603 0R,
and, in this case,
R208,
R145, R274, and R287 must be disconnected. LED D19 (green) indicates the presence of the
3.3 V output from U20.
The voltage dividers ( R145/R287 ) and ( R151, R208 ) provide the EVB with greater flexibility. If
necessary, the EVB can then work with variable output voltage LDOs.
R288 , and R211 provide an option to supply the MCU-LINK chip from U11 output voltage.
3.1.1.3 USB 2.0 On-The-Go (OTG)
The OTG function is only supported on the module USB-OTG power switch ( U12), as shown in
Figure 10. It is set to the OTG-device by default. Connect jumper J14 to allow IRIS-W10 sense
the presence of the MUSB-OTG-VBUS.
Figure 10: USB On-The-GO switch
Note that:
•
Use the 2.4 A maximum current option as mentioned in section Powering the board .
•
Populate R121 , and R122 with 1206 0R resistors.
•
Check the status of resistors, R106, R107, R108, R109, required mode connection.
•
LED D20 (Green) indicates the activation of the OTG function.
Maximum current capacity of the USB-OTG is 500 mA. LED D2 (Red) indicates if the current
to
OTG-USB
exceeds the current rating (800 mA).