EVK-M8F User Guide
UBX-15016541 - R01
Early Production Information
Device description
Page 10 of 21
The Antenna connector is only to be used with a GNSS antenna or simulator. Do not connect
this equipment to cable distribution systems.
4.3.2
USB
A USB V2.0 compatible serial port is featured for data communication and power supply.
4.3.3
UART
The evaluation unit includes an RS232 port for serial communication that is compatible with PC serial ports.
Connect using a straight RS232 serial cable with male and female connectors to the port on your PC. The
maximum cable length is 3 meters. To configure the RS232 port, use the CFG_PRT command in the u-center
application. The maximum operating baud rate is 921.6 kBd.
If you are using a USB to RS232 adaptor cable, you can connect it directly to the evaluation kit RS232 port.
The 9-pin D-SUB female connector is assigned as listed in Table 4:
Pin Nr.
Assignment
1
not connected
2
TXD, GNSS Transmit Data, serial data to DTE
3
RXD, GNSS Receive Data, serial data from DTE
4
not connected
5
GND
6-9
not connected
Table 4: SUB-D9 Connector pin description
4.3.4
RST button
The RST button on the front panel resets the unit. To avoid an inadvertent reset, the button is recessed.
4.3.5
Safe boot button
This is used to set the unit in safe boot mode. In this mode the receiver executes only the minimal functionality,
such as updating new firmware into the SQI flash. In order to set the receiver in safe boot mode please follow
these steps.
1.
Press the BOOT button and keep holding
2.
Press the RST button
3.
Release the RST button
4.
Release the BOOT button
5.
If the UART interface has to be used, the training sequence has to be sent to the receiver.
The training sequence is a transmission of 0x55 55 at the baud rate of 9600 Bd. Wait for at least 100
milliseconds before the interface is ready to accept commands.
4.3.6
Slide Switch
Use the slide switch on the front panel to choose between I
2
C (and RS232) and SPI
communication ports. You
must reset the unit by pressing the RST button when the slide switch has been changed.
1.
I
2
C
– In this selection the EVK operates with the RS232 (DB9 – rear panel) or the 3.3 V level TxD (MISO),
RxD (MOSI) at the front panel. Also the communication via 3.3 V DDC interface (I
2
C) is selected.
2.
SPI –
In this selection the EVK operates only with the SPI interface. RS232 (DB9) is switched off.
For more information about specification and usage of SPI interface see the
LEA-M8F Data Sheet
[2] and
the
LEA-M8F Hardware Integration Manual
[4].
4.3.7
Test Connector
This 14-pin test-connector provides additional functionality to the EVK, allowing access to the interface pins and
an ability to measure the current used by the EVK. All pins are ESD protected.
