u-blox EVK-M91-00-01, Руководство пользователя

Страница: 10 / 27

EVK-M91 - User guide
5 Device description
EVK-M91 evaluation unit contains the GNSS receiver, external TCXO, SAW and an LNA. Option for
SPI flash can also be evaluated with the evaluation kit.
5.1 Interface connection
The EVK-M91 supports all three communication interfaces: UART, I2C and SPI. For connecting the
EVK to a PC, use a standard SUBD-9 cable or the included USB Type-C cable depending on the
interface in use.
The u-blox M9 GNSS receiver has a USB interface which allows direct communication to the receiver
by USB.
Additional measurement equipment can be connected to the front connector.
Figure 1: Connecting the unit for power supply and communication
Figure 2 shows the front and the back panel of the EVK-M91 evaluation unit.
Figure 2: EVK-M91 front and back panels
5.1.1 Interface switch
Use the interface switch on the front panel to choose between I2C/UART and SPI communication
ports. You must reset the unit by pressing the RST button after the interface switch setting has
been changed.
1. I2C – In this selection the EVK operates with the UART (RS-232 – back panel or the 3.0 V level
TXD (MISO), RXD (MOSI) at the front panel). Also the communication via 3.0 V I2C interface is
selected.
UBX-19056858 - R04 5 Device description Page 10 of 27
C1-Public