EVK-7 / EVK-8 / EVK-M8 User Guide
UBX-14002502 - R10
Early Production Information
Device description
Page 10 of 25
Figure 3: EVK Label
4.3.5
RST button
The RST button on the front panel resets the unit. To avoid an inadvertent reset, the button is
recessed.
4.3.6
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.
4.3.7
Slide Switch
Use the slide switch on the front panel to choose between I2C (and UART) and SPI
communication
ports. You must reset the unit by pressing the RST button when the slide switch has been changed.
1.
I2C – In this selection the EVK operates with the UART (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 (I2C) is selected.
2.
SPI – In this selection the EVK operates only with the SPI interface. RS232 (DB9) is switched
off.
4.3.8
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.
For accurate measurements, it is recommended to use a cable of at most 1 meter in length. Figure
3 shows an example of a power supply connected to the test connector by using standard adapter
cables from the manufacture Hirschmann. Figure 4 shows an example for overall current
measurement. When connecting the 3.3 V digital interfaces RS232, SPI and DDC to your application,
a cable length less than 25 cm is recommended.
