EVK-M101, EVK-M101C - User guide
Pin no.
Pin name
I/O
Level
Description
2
RxD/MOSI
I
3.3 V
Serial port receive or SPI slave receive, operation selected by
interface switch.
1
GND
I
–
Recommended common ground pin.
Table 4: EVK-M101/C 14-pin connector pin description
Figure 3: EVK-M101/C 5.0 V DC power supply example
When using the 3.3 V digital interfaces with your application (e.g. SPI or I2C), a cable length
less than 25 cm is recommended.
4.1.3 USB
The USB Type-C connector in the evaluation kit can be used for both power supply and
communication. The easiest way to evaluate the EVK-M101/C operation is to connect the EVK
to a PC with the USB-C 2.0 cable and then to use the u-center 2 tool to configure and monitor
the GNSS functions. The USB connector is internally connected to a USB-to-Serial converter that
connects to the UART interface of the u-blox M10 receiver, which allows the USB connector to be
used for communication as well.
(option 0) and (option 2) can be used for USB
communication with the receiver.
When the EVK is connected to the PC, Windows creates a virtual COM port to the PC. This newly
created virtual COM port needs to be selected in the u-center 2 evaluation tool for communicating
with the receiver. EVK-M101/C supports USB-to-UART communication speeds up to 921600 baud.
4.1.4 UART
The EVK unit includes two options for the UART connection, one is an RS-232 port for serial
communication with the PC and the other one is through the 14-pin connector. By default, the UART
communication speed is set to 38400 baud and EVK-M101/C supports speeds up to 921600 baud.
The following
options are available for UART communication:
•
Option 0:
when the internal SPI flash memory is used.
•
Option 2:
when the internal SPI flash memory is not used.
4.1.4.1 RS-232
Connect to the RS-232 port on the PC using a straight RS-232 serial cable with male and female
connectors. The maximum cable length is < 3.0 meters. To configure the RS-232 port, use the UBX-
CFG-VALSET command and select CFG-UART1 Configuration group in the u-center 2 evaluation
tool. The maximum operating baud rate is 921600 baud. Note, if a USB-to-RS-232 adapter cable
is used, it can be connected directly to the RS-232 port of the evaluation kit. The RS-232 port also
UBX-21003949 - R04
4 Device description
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