EVK-M101, EVK-M101C - User guide
provides TIMEPULSE output signal and supports evaluation of EXTINT functions such as time mark,
time aiding, and wakeup from power save modes.
The 9-pin RS-232 female connector is assigned as listed below:
Pin no.
Assignment
1 & 6
Time pulse
2
TXD/SPI_MISO (GNSS Transmit Data, serial data to external device)
3
RXD/SPI_MOSI (GNSS Receive Data, serial data from external device)
4
EXTINT
5
GND
7, 8 & 9
not connected
Table 5: EVK-M101/C RS-232 connector pin description
4.1.4.2 UART through 14-pin connector
The EVK also provides UART communication through the 14-pin connector on pins TxD and RxD,
see section
for more information.
4.1.5 SPI
The SPI interface pins are available on the 14-pin connector, see section
for more
information.
If the SPI interface is used for communication with the receiver, the
must
be set to SPI (option 1).
4.1.6 I2C
The 14-pin connector contains pins for evaluating I2C bus communication. If the I2C interface is
used, the
must be set to I2C (option 2).
By default, the optional I2C pull-up resistors are not populated on the EVK board. The u-blox M10
GNSS receiver already contains internal pull-up resistors for normal use. If fast communication
speed with long cable length is needed, the optional pull-up resistors can be placed to the reserved
location on the EVK board.
4.2 GNSS input signal
To evaluate the GNSS reception, the GNSS signal must be supplied to the antenna input SMA
connector of the evaluation kit. EVK-M101/C evaluation kit includes a GPS / Galileo / GLONASS /
BeiDou antenna with a 3.0 m cable. It is possible to connect various active and passive GNSS
antennas with SMA connectors or provide a signal from a recorded or simulated GNSS RF source
to the antenna input. Also, an external SAW filter can be connected to the RF input connector, for
evaluating an SAW-LNA-SAW improved immunity performance.
4.2.1 Antenna connector
For connecting an active or a passive antenna, an SMA female connector is available on the front
panel of the EVK unit (see
). The RF path on EVK-M101/C contains an LNA and an SAW filter
having 3.3 V DC voltage in the RF input. The EVK provides 3.3 V bias supply for the external antenna
and the recommended maximum antenna supply current for active antennas is 30 mA. This pin is
also ESD protected.
Avoid having a short at the RF input because there is no short circuit detection or antenna
supervisor feature on the EVK-M101/C.
UBX-21003949 - R04
4 Device description
Page 11 of 30
C1-Public
