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17
SEL_MCU_N
16
TIME_MARK_J2
15
WOM
14
GND_A
13
WT
12
GND_A
11
FWD
10
V_BCKP_MEAS
9
SDA / CS
8
V_BCKP_1
7
SCL / SCK
6
GND
5
TxD / MISO
4
VIN_LDOS
3
RxD / MOSI
2
GND
1
TIMEPULSE
2.5 10-pin rear connector
The 10-pin rear connector is used for updating the MCU firmware. See section 5.5 for more
information.
2.6 Reset and safe boot buttons
The reset button on the front panel resets the unit.
The safe boot button is used to set the unit in the safe boot mode. In this mode, the receiver executes
only the minimal functionality, such as updating new firmware into the flash. USB communication is
disabled while in the safe boot mode.
To set the receiver in the safe boot mode:
• Press and hold the BOOT button.
• Press the RST button.
• Release the RST button.
• Release the BOOT button.
To use UART in the safe boot mode, a training sequence needs to be sent to the receiver. The training
sequence is a transmission of two bytes (0x55 0x55) at the baud rate of 9600. Wait for at least 100
milliseconds before the interface is ready to accept commands.
2.7 I2C/SPI slide switch
The I2C/SPI slide switch should be kept in the I2C position to keep the I2C and UART interfaces
enabled. The onboard MCU uses I2C to communicate with the receiver, so disabling I2C also disables
the CAN interface.
For further information, contact u-blox technical support.
2.8 LED
On the front panel of the EVK unit, there is a single blue LED with the following functionality:
UBX-23007618 - R01
C1-Public
I
Pull-down signal for enabling UART communication with the MCU
I
Time mark input
O
Wake-on-motion signal output
Ground for speed and direction inputs
I
5 – 24 V
Wheel tick pulse input
Ground for speed and direction inputs
I
5 – 24 V
Direction of travel input
O
Backup voltage measurement point
I/O
3.3 V
I2C SDA / SPI CS signal
I
3.3 V
Backup voltage extra input
I/O
3.3 V
I2C SCL / SPI SCK signal
I
Common ground for casing, power and serial interfaces
I/O
3.3 V
UART TxD / SPI SDO (MISO) signal
O
LDO input voltage measurement point
I/O
3.3 V
UART RxD / SPI SDI (MOSI) signal
Common ground for casing, power and serial interfaces
O
Time pulse signal from the ZED-F9K (TP1)
Device description
EVK-F9DR - User guide
Page 7 of 33
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