Usb; Uart - Ublox EVK-M101 User Manual

Pin no. Pin name
2 RxD/MOSI
1 GND
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.
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 Interface switch
• 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
C1-Public
I/O Level
I 3.3 V
I –
Interface switch
options are available for UART communication:
4 Device description
EVK-M101, EVK-M101C - User guide
Description
Serial port receive or SPI slave receive, operation selected by
interface switch.
Recommended common ground pin.
(option 0) and (option 2) can be used for USB
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