EVK-M8L User Guide
UBX-20028627 - R01
Device description
Page 9 of 33
C1-Public
3.3.6
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: With 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: With this selection, the EVK operates only with the SPI interface. RS232 (DB9) is switched
off.
3.3.7
Front connector
This 14-pin connector provides access to additional functionality to the EVK using various interface
pins. Most importantly, it provides the interface to the vehicle speed pulse (WHEELTICK) input. The
WHEELTICK signal should be adequately de-bounced before application to the EVK input.
The connector also enables measurement of the current used by the EVK. For accurate
measurements, it is recommended to use a cable of at most 1 meter in length.
We recommend using the ACE-AM-0 mating connector or equivalent available from our online shop.
All pins are ESD-protected.
