14-Pin Connector - Ublox EVK-M101 User Manual

1. UART (option 0) – In this selection, the EVK communicates with the receiver through the
UART interface and allows the use of the internal SPI flash memory.
2. SPI (option 1) – In this selection, the EVK communicates with the receiver only through the
SPI interface. RS-232 is switched off.
3. I2C / UART (option 2) – In this selection, communication via 3.3 V I2C interface is available
and the EVK can also communicate with the receiver through the UART interface (via USB or
RS-232 – back panel or the 3.3 V level TXD/MISO, RXD/MOSI pins at the front panel).

4.1.2 14-pin connector

The EVK-M101/C front panel has a 14-pin connector that provides PIO, communication interfaces
and supply options. All these pins are ESD protected. The 14-pin connector can be used for
communicating with the receiver through UART, SPI, and I2C interfaces. In addition, the 14-pin
connector provides flexibility for evaluating other advanced scenarios.
Pin no. Pin name
14 5V_IN
13 GNSS I2
12 GNSS I1
11 BCKP I1
10 BCKP I2
9 VBCKP
8 TIMEPULSE
7 EXTINT
6 LNA_EN
5 SDA/CS
4 SCL/SCK
3 TxD/MISO
V_IO is connected to 3.3 V supply. V_CORE and V_RF power domains are connected to 1.0 V. See section
1
for more details.
UBX-21003949 - R04
C1-Public
I/O Level
I 4.75 - 5.25 V
O 3.3 V
O 3.3 V
O 3.3 V
O 3.3 V
I 3.3 V
O 3.3 V
I 3.3 V
I/O 3.3 V
I/O 3.3 V
I 3.3 V
O 3.3 V
4 Device description
EVK-M101, EVK-M101C - User guide
Description
Power input – can be used instead of USB.
Supply current measurement (total current) node 2. See pin
12 description.
Supply current measurement (total current) node 1. Current
measured from voltage over a 0.1 Ω 1% resistor between
pins 12 (GNSS I1) and 13 (GNSS I2). Pin 12 (GNSS I1) is
at higher potential. NOTE: the total current includes the
V_CORE, V_RF, and V_IO current consumption
Backup supply current measurement node 1. Connected to
backup supply (super capacitor). Current measured from
voltage over a 100 Ω 1% resistor between pins 11 (BCKP I1)
and 10 (BCKP I2). Pin 11 (BCKP I1) is at higher potential.
Backup supply current measurement node 2. See pin 11
description.
Backup power supply input – optional input for testing
backup operation.
Time pulse signal (50 ohms output). Can also be used as
generic input/output (PIO4). The time pulse signal can be re-
assigned as LNA_EN signal for controlling the external LNA.
In this configuration, the LNA_EN jumper on the EVK board
should be left open (i.e. not connected).
External interrupt signal. Can be used for time mark feature,
time aiding, and wakeup from power save modes.
LNA enable signal that controls the external LNA.
When this pin is used as an input, the LNA_EN jumper on the
EVK board should be left open (i.e. not connected).
When this pin is used as an output, the LNA_EN jumper on the
EVK board can be open or connected.
If the interface switch slide is on I2C (option 2), then the I2C
interface is selected; Function: data input / output.
If the interface switch slide is on SPI (option 1), then the
SPI interface is selected; Function: chip select input (ACTIVE
LOW).
Clock input for I2C and SPI interfaces.
Serial port transmit or SPI slave transmit, operation selected
by interface switch.
1
.
GNSS current
Page 9 of 30