Ublox C030-R412M User manual

C030-R412M - User Guide
UBX-19010121 - R01 Page 2 of 27
Document Information
Title
C030-R412M
Subtitle
LTE Cat M1/NB1 and 2G Mbed Enabled™IoT starter kit
Document type
User Guide
Document number
UBX-19010121
Revision and date
R01
01-Jul-2019
Disclosure Restriction
Product status
Corresponding content status
Functional Sample
Draft
For functional testing. Revised and supplementary data will be published later.
In Development /
Prototype
Objective Specification
Target values. Revised and supplementary data will be published later.
Engineering Sample
Advance Information
Data based on early testing. Revised and supplementary data will be published later.
Initial Production
Early Production Information
Data from product verification. Revised and supplementary data may be published later.
Mass Production /
End of Life
Production Information
Document contains the final product specification.
This document applies to the following products:
Product name
Type number
Firmware version
PCN reference
Product status
C030
C030-R412M-0-00
G0.V.00.00.10R
UBX-19027009
Initial production
u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this
document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only
permitted with the express written permission of u-blox.
The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or
implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular
purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent
documents, visit www.u-blox.com.
Arduino® is a trademark of Arduino Srl or Arduino LLC registered and/or used in the EU, the U.S. and other countries/regions.
Arm and Mbed™ are registered trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
JT® is a registered trademark of JTGlobal Limited in the EU, the U.S. and other countries/regions
Copyright © u-blox AG.

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Contents
Document Information................................................................................................................................2
Contents ..........................................................................................................................................................3
1Overview ...................................................................................................................................................4
Using this guide.................................................................................................................................................... 4
Warnings and certifications..............................................................................................................................5
2Hardware description ...........................................................................................................................6
2.1 C030-R412M block diagram...................................................................................................................... 8
2.2 Buttons, jumpers and switches ............................................................................................................. 10
2.2.1 Utilization of cellular modem USB sniffer..................................................................................... 11
2.3 LED indicators ............................................................................................................................................12
2.4 Connectors ................................................................................................................................................. 13
2.5 Configuration links / components ......................................................................................................... 14
2.6 Test, break out points, and debug interfaces ..................................................................................... 18
2.7 Arduino™ UNO R3 compatible interface pin out................................................................................. 19
2.8 Power supply options and LiPo battery usage....................................................................................20
3Getting started.....................................................................................................................................22
3.1 C030-R412M board setup .......................................................................................................................22
3.2 Development PC USB driver configuration..........................................................................................22
3.3 Getting started with Mbed......................................................................................................................22
4Approvals............................................................................................................................................... 23
4.1 European Conformance...........................................................................................................................23
4.2 US Federal Communications Commission notice..............................................................................24
4.3 Innovation, Science, Economic Development Canada notice ..........................................................24
Appendix ........................................................................................................................................................25
AGlossary ..................................................................................................................................................25
Related documents ....................................................................................................................................26
Revision history ...........................................................................................................................................26
Contact...........................................................................................................................................................27

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1Overview
The u-blox LTE Cat M1/NB1 and 2G Mbed Enabled™ IoT starter kit is a versatile development platform
that allows quick prototyping of a variety of applications for low-power Internet of Things (IoT).
The u-blox C030-R412M belongs to the u-blox C030 application board family, which consists of several
variants based on the type of u-blox cellular module used:
SARA-U201 HSPA module with 2G fallback
SARA-N211 NB-IoT (LTE Cat NB1) module
SARA-R412M LTE Cat M1 / NB1 and 2G module
LARA-R3121 LTE Cat 1 single-mode module with integrated GNSS receiver
The u-blox C030 application boards, except C030-R3121, have a u-blox MAX-M8C module or a ZOE
GNSS SiP as a concurrent GNSS receiver, thereby enabling straight forward development of location-
aware, globally communicating applications.
The u-blox C030-R412M board provides access to a variety of hardware interfaces (10/100 Mb/s
Ethernet, 22 GPIOs with SPI, I2C, UART, PWM) through the Arduino™ Uno R3 compatible header
connector.
An eUICC (embedded SIM) is integrated on the u-blox C030-R412M-U201 / C030-R3121 variants. The
eUICC comes with International Data Roaming Cellular Connectivity Service by JT® JTGlobal (formerly
Jersey Telecom) with 50 MB of data for the period of 90 days, which can be topped up and extended
on demand.
The u-blox C030-R412M board is powered by an Arm® Cortex-M4 based ST®STM32F437VGT Host
microcontroller, which is fully supported by the Arm®Mbed™platform. The microcontroller has 512 kB
flash, 64 kB RAM, and runs an up-to-96 MHz system clock. The board provides simple USB drag-n-
drop programming and an ST-Link debug interface for the Host microcontroller. The Arm Mbed
platform provides free software libraries and online tools for professional rapid prototyping. The
programming is done using a standard-based C/C++ SDK. The Arm Mbed compiler also supports full
export to various tool chains, for projects that demand it as they go into production.
The u-blox C030-R412M also works with a wide choice of Integrated Development Environments
(IDEs) including but not limited to Arm®Keil®, GCC-based Eclipse IDEs.
This document applies to the C030-R412M variant integrating the SARA-R412M LTE Cat M1/NB1 and
2G module, and the ZOE-M8B GNSS receiver SiP (System-in-Package) only.
Using this guide
This guide assumes the user has basic computer skills and is familiar with the Windows Graphical
User Interface (GUI) and cellular module environments.
The following symbols are used to highlight important information in the document:
☞An index finger points out key information pertaining to device operation and performance.
⚠A warning symbol indicates actions that could negatively impact or damage the device.

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Warnings and certifications
C030-R412M is an Electrostatic Sensitive Device (ESD).
CAUTION! Risk of short circuit of the battery when touching it with conducting
parts. In the unlikely event of a failure in the internal protection circuitry, there is
a risk of an explosion when charging fully or partially discharged batteries.
Replace the battery if it no longer has sufficient charge for unit operation. Control
the battery before using it if the device has not been operated for an extended
period of time.
C030-R412M application boards comply with the Directive 2011/65/EU of the European Parliament and
the Council on the Restriction of Use of certain Hazardous Substances in Electrical and Electronic
Equipment (EU RoHS 2) and its amendment Directive (EU) 2015/863 (EU RoHS 3).
C030-R412M application boards are RoHS 3 compliant and green (no halogens).
See section 4for further details about certification approvals.

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2Hardware description
The u-blox C030-R412M has the following onboard hardware features:
u-blox SARA-R412M LTE Cat M1/NB1 and 2G module
u-blox ZOE-M8B concurrent GNSS receiver SiP for up to 3 GNSS (GPS, Galileo, GLONASS, and
BeiDou)
STM32F437VG Cortex-M4 ARM Host MCU with 1024 kB Flash, 256 kB SRAM and SWD connector
o12 MHz crystal oscillator for system clock
o32.768 kHz crystal oscillator for real-time clock
o1.8 V operation
On-board ST-Link/V2-1 debugger/programmer with SWD connector
oST-Link/V2-1 standalone development and debug capability
oUSB re-enumeration; Virtual COM port, Mass Storage Device and Debug Port
o5V from ST-Link/V2-1 Debug USB VBUS, 3.3V operation
o(CMSIS-DAP variant of the FW with extended features will be available in the future)
On-board TI® bq24295 Single Cell LiPo battery charger and TI® bq27441-G1 Battery Fuel Gauge
Molex® SPOX™ 5268-03A LiPo battery connector
oSupports battery types like LP-503759-IS-3 from BAK (battery is not included)
On-board SiLabs® CP2105 USB to Dual UART Bridge as Serial USB sniffer
oAlternative to ST-Link/V2-1 Virtual COM Port when ST-LINK/V2-1 is not used/available
oAlternative to Main Supply and Debug USB 5V VBUS inputs
oSniffing serial communication between the Host MCU and the Cellular module
RGB User LED, and two push buttons: User and Reset
On-board SiLabs® Si7034-A10 Humidity and Temperature Sensor
oOnly the temperature sensor is used; it cannot be used for humidity measurements
SD card socket for file storage
SMA RF connectors for 50 Ωcellular and GNSS active antennas
MicroSIM card holder
Extension:
oArduino™ Uno R3 compatible interface
o6 analog capable inputs
o8 PWM capable outputs
o22 GPIOs
o1 x SPI
o1 x I2C
o1 x UART with HW flow control option (RTS, CTS)
Flexible board power supply:
o5 V main supply USB, debug USB, and sniffer USB VBUS inputs
oArduino UNO R3 VIN input for external power supply
⚠VIN voltage level should not exceed the C030 component and SARA-R412M absolute maximum
ratings.
o2.8 V to 4.4 V LiPo Battery input
Support of a wide range of Integrated Development Environments (IDEs), including but not limited
to GCC-based IDEs, ARM mbed
ARM mbed Enabled (see http://mbed.org)

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Figure 1: C030-R412M application board overview

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2.1 C030-R412M block diagram
Figure 2 shows the block diagram of the C030-R412M.
Figure 2: C030-R412M block diagram
Figure 2 shows the major interfaces and internal connections of the C030-R412M.
The major component layout of the board is provided in Figure 3.
The C030-R412M consists of three sections:
Utility section
The utility section accommodates the components that provide SW debugging / virtual COM port
(ST-Link/CMSIS-DAP) and Ethernet Interface functions. The SW debugging / virtual COM port
functions are executed by the InterfaceMCU via the “Debug USB” interface.
As this section is only needed during the application development and test activities, it could be
physically snapped off from the application section to decrease the size and power consumption.
The utility section is powered up from the “Debug USB” 5V VBus. When the “Debug USB” is not
connected, SW debugging / virtual COM port and Ethernet Interface functions are turned off and
isolated from the application section.
The “Auxiliary 5V USB” connector on the utility section could be used to boost the power input to the
application section if the current input from the “Debug USB” 5V Vbus is not sufficient.
Application section
The application section accommodates the GNSS and cellular modules, a eUICC (Embedded SIM) /
MicroSIM socket, the HostMCU, the battery charging/management and power supply circuitry, the
SD card interface and socket, the Serial USB sniffer for communication between the HostMCU to the
cellular module and similarly to the InterfaceMCU. The application section also has a temperature
sensor for measuring ambient temperature of the board. Reset and user buttons, configuration
jumpers and User and system status indication LEDs are placed in the application section.
VSYS

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The application section is designed for minimal power consumption. Unutilized circuitries and
sections could be either turned off by software or inhibited electronically.
The Arduino Uno R3 interface on the application section could be used to integrate sensors, actuators
and power/battery supply circuitries as Arduino Shields/expansion daughter PCBs.
The application section could run standalone when the utility section is snapped off.
Antenna section
The C030-R412M has SMA Jack edge connectors for Cellular and GNSS antennas.
The C030-R412M major component layout is provided in Figure 3.
Figure 3: C030-R412M major component locations

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2.2 Buttons, jumpers and switches
The C030-R412M is equipped with several buttons, jumpers and a switch that the user can easily
utilize. The functions and locations of these components are provided in Table 1 and shown in Figure 3.
Annotation
Function
Description
Section
USER
User button
Push button for application use. Connected to HostMCU GPIO
Port PC13
Application
RST1
Reset button
Push button to reset the HostMCU
Application
P1
System power jumper
System power input selection:
Pin 1-2: on board Power/Battery Management (default
configuration)
Pin 2-3: VIN pin of Arduino Uno R3 interface
Application
S2
Serial USB sniffer source select
Select the cellular module communication UART channel to sniff:
Position 1: isolation
Position 2: UART1 communication between HostMCU and
cellular module
Application
Table 1: C030-R412M buttons, jumpers, and switches
Figure 4 shows the C030-R412M P1 and P3 jumpers and S2 switch positions.
Figure 4: C030-R412M jumper and switches

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2.2.1 Utilization of cellular modem USB sniffer
The C030-R412M cellular modem USB sniffer provides two virtual UART COM channels to the
connected USB master (development PC). The cellular modem USB sniffer USB VBUS 5VDC rail power
the application section of the C030-R412M. The virtual COM ports are utilized as follows;
Standard COM port as on the development PC: HostMCU USART2 Tx “printf” Channel sniffing
oHostMCU USART2 Tx is also connected to the InterfaceMCU on the utility section
oHostMCU USART2 Rx is connected to InterfaceMCU on the utility section
oHost HostMCU USART2 Rx can be connected to cellular modem USB sniffer Standard COM
port Tx channel via R137 link (see Table 4). In this case, do one of the following:
The utility section should be powered off (disconnect Debug USB)
Snap off the utility section
Remove R133 link (see Table 4)
Enhanced COM port as on the development PC. Two operation modes can be selected by using S2
switch (see Figure 4):
oS2 position 1: Isolation
oS2 position 2: HostMCU USART1 to cellular module communication. Allows direct access to
the cellular module. In this case, do one the following:
Remove R105 link
Set the HostMCU PA_5 Port as GPIO input to avoid collusion
☞Enhanced COM port Mode 1 direct access to the cellular module allows using development PC
applications like u-blox m-center, to exercise cellular module AT command interface bypassing the
C030-R412M HostMCU.

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2.3 LED indicators
The C030-R412M has a few LEDs to indicate the board status for generic application use. Due to the
low power design of C030-R412M, if the C030-R412M is not connected to an external power source or
is powered from battery only, all the LEDs except D3 (User RGB LED) are turned off.
As the D3 and LED_G3 LEDs are controlled by the application, they can be completely turned off to
save power.
The C030-R412M LED indicators are listed in Table 2 and their locations are depicted in Figure 3.
Annotation
Function
Description
Color
LED1
Debug USB VBUS
VBUS 5 V indicator for InterfaceMCU supply
LED2
Serial USB Sniffer VBUS
VBUS 5 V indicator for serial USB sniffer supply
LED3
Aux 5 V USB VBUS
VBUS 5 V indicator for 5 VDC supply input
LED4
Cellular module USB VBUS
VBUS 5 V indicator
LED5
Battery charging / man. Input
Battery Charging/Management 5 VDC input supply indicator
LED6
STLink/CMSIS-DAP status
InterfaceMCU Debugging/Flashing status RED/GREEN indicator
LED7
Battery charging status
Battery Charging/Management battery charging status indicator
D3
User RGB LED
HostMCU GPIO driven; PE_3: RED, PE_4: GREEN, PE_1: BLUE (all
negative logic)
ETH green1
ETH connection speed
Connection speed indication. On:100 Mb/s, Off:10 Mb/s
ETH yellow1
ETH transaction/traffic
Indicates Ethernet transaction. Controlled by HostMCU GPIO PE_7
Table 2: C030-R412M LED indicators
1
Ethernet LED indicators are powered by 3.3 VDC generated from the Debug USB VBUS, which powers the whole Utility section.
If the Debug USB is not connected to a USB master (for example, a development PC), the Utility section is powered down, and
therefore the Ethernet LED indicators do not light up.

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2.4 Connectors
The C030-R412M has various connectors as listed in Table 3. See Figure 3 for connector locations.
Name
Function
Description
Section
ETH1
Ethernet receptacle
10/100 Mb/s Ethernet network connector
Utility
J6
Auxiliary 5V USB
Micro USB device connector for auxiliary 5 VDC supply input to
connect a high current 5 VDC PSU
Utility
J1
Debug USB
Micro USB device connector for 5 VDC supply and ST-Link/CMSIS-
DAP debug interface
Utility
J2
Micro SD card socket
Micro SD card holder for FAT file system
Application
J3
Serial USB sniffer
Micro USB device connector for 5 VDC supply and serial USB sniffer
interface
Application
J4/J5
LiPo battery connector
LiPo chargeable battery connector. J4: Not populated alternative
connector, J5: Molex 22-05-7035
Application
J7
Cellular module USB
Micro USB device connector for cellular module USB interface
Application
J8
SIM card holder
SIM card holder (for C030-N211 and C030-R410M only)
Application
SWD
InterfaceMCU debug
10-pin Arm Cortex debug connector for InterfaceMCU (may not be
populated)
Utility
ST_SWD
InterfaceMCU debug
Tag-Connect-NL Plug-of-Nails™ connector compatible PCB touch
points footprint for InterfaceMCU
Utility
SWD_TARGET
HostMCU debug
10-pin Arm Cortex debug connector for InterfaceMCU (may not be
populated)
Application
SWD_TGT1
HostMCU debug
Tag-Connect-NL Plug-of-Nails connector compatible PCB touch
points footprint for HostMCU
Application
ANT
Cellular main antenna
SMA connector for the cellular module primary antenna (ANT1, Tx/Rx)
Application
GPSANT
GNSS receiver antenna
SMA connector for the ZOE-M8B GNSS receiver
Application
Table 3: C030-R412M connector description
☞The J2 Micro SD card socket shares the Arduino interface D10 to D13 pins, which are used as an
SPI bus to the HostMCU SPI4 peripheral. The D10 pin (NSS) is used as an SD card SPI slave select
signal. When the SPI bus on the Arduino interface is utilized by other SPI slaves on daughter
boards, free Arduino digital IO lines should be utilized for slave select signals.
⚠As the SD card interface and its supply voltage are designed to work with 3.3 VDC, the SD card
socket shall not be used when the Arduino interface IOREF voltage level is set to higher than
3.3 VDC. Such usage could cause a permanent damage and/or a failure to an SD card inserted in
the J2 socket and the C030-R412M’s Arduino™ interface level translators. (See R152 and R153
links in Table 4).

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2.5 Configuration links / components
The C030-R412M has multiple configurations links and components as SMT footprints, which require
de-soldering/soldering these links or components on the PCB. The footprints of these configuration
links, which are listed in Table 4 and depicted in Figure 5, are adequate to solder 0603 SMT
components or short with solder.
Name
Function
Variant2
R412M
Description
R2
InterfaceMCU 1.8VDC supply sampling
Utilized for monitoring HostMCU 1.8 VDC supply level through a
voltage divider
R3
InterfaceMCU PB_3 port pull up link
Link to InterfaceMCU 3.3 VDC rail
R5
InterfaceMCU 3.3VDC analog reference
link
Reference voltage for InterfaceMCU AtoD conversion
R6
Cellular module current sense
(Provisional3) Connected to cellular module power supply current
instrumentation amplifier output to measure the current level
R7
GNSS module current sense
(Provisional3) Connected to GNSS module power supply current
instrumentation amplifier output to measure the current level
R14
InterfaceMCU 32 kHz clock input
Ground connection
R15
InterfaceMCU BOOT0 pull up
Link to InterfaceMCU 3.3 VDC PSU
R20
InterfaceMCU USART2 virtual COM Tx
link
Link to HostMCU USART1 Tx signal through 3.3 V to 1.8 V level
translator
R21
InterfaceMCU USART2 virtual COM Rx
link
Link to HostMCU USART1 Rx signal through 3.3 V to 1.8 V level
translator
R22
InterfaceMCU virtual COM loop back
For testing InterfaceMCU Virtual COM port
R23
InterfaceMCU I2C1 SDA link
(Provisional4) Link to HostMCU I2C3 SDA bus through 3.3 V to
1.8 V level translator
R25
InterfaceMCU I2C1 SCL link
(Provisional4) Link to HostMCU I2C3 SCL bus through 3.3 V to
1.8 V level translator
R31
Arduino Interface IOREF to 3.3V
33 Ωlink to 3.3 VDC
R33
Arduino Interface 3.3V supply
Link to 3.3VDC rail
R38
Arduino Interface A4 pin voltage divisor
1 kΩvoltage divisor resistor for analog input. It could be removed
for I2C SDA alternative usage
R39
Arduino Interface A5 pin voltage divisor
1 kΩvoltage divisor resistor for analog input. It could be removed
for I2C SCL alternative usage
R47
HostMCU BOOT1 pull down
HostMCU BOOT1 input setting to ‘0’
R48
HostMCU temperature sensor power
link
Si7034-A10 Temperature sensor power supply link5. Supply
feeding to the temperature sensor from the HostMCU PD_ 14
when it is set to ‘1’. PD_14 Push-Pull output circuitry limits the
current to the sensor.
R53
HostMCU 32 kHz RTC link
Links RTC crystal to the HostMCU
R56
Application section 3.3VDC PSU control
Links the HostMCU PE_0 port to control 3.3VDC PSU. ‘0’:disable,
‘1’:enable
R59
HostMCU reset pull up
The application section reset circuitry pull up resistor
R60
HostMCU 32KHz RTC link
Links RTC crystal to the HostMCU
R61
HostMCU 12MHz XTAL link
The HostMCU 12 MHz crystal link
2
: Connected/populated, : Not connected/open
3
Provisional feature (Module current consumption): instrumenting the current consumption of the Cellular and GNSS Modules
from the InterfaceMCU to characterize and instrument the application behavior during development.
4
Provisional feature (I2C Bus Access): accessing Application section sensors and devices on the HostMCU I2C3 Bus from
InterfaceMCU to characterize and instrument the application behavior during development.
5
The Si7034-A10 is a Temperature and Relative Humidity Sensor. The HostMCU PD_4 port cannot provide enough current to
the sensor to run the Humidity sensor’s heating element. So, the Humidity feature of the sensor shall not be used.

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Name
Function
Variant2
R412M
Description
R63
IC19 BQ27441 BIN pull up link to BQVDD
Provisional
R68
HostMCU BOOT0 pull down
HostMCU BOOT0 10 kΩpull down to ground for input setting to
‘0’
R73
GNSS module backup supply by-pass
ZOE-M8B V_BCKP by-pass
R77
Cellular module voltage translator
supply
Voltage translator supply level for the cellular module side for the
HostMCU USART1 communication. Link the translator supply
input to cellular module’s V_INT internal supply output
R78
Cellular module voltage translator
supply
Voltage translator supply level for the cellular module side for the
HostMCU USART1 communication. Link the translator supply
input to the application section supply rail VSYS
R79
LiPo battery charging link
Battery charging and management circuitry link to LiPo battery
for charging
R86
Icellular signal pull down
Provisional
R95
Cellular module UB_M_PWRON to
M_VBCKUP link
100 kΩconnection between M_VBCKUP and UB_M_PWRON nets
R96
Cellular module V_BCKP link
Link to M_VBCKUP net
R97
Cellular module PWR_ON link
The HostMCU PD_2 port UB_M_PWRON signal to cellular module
PWR_ON pin
R99
The HostMCU PC_11port to cellular
module GPIO1 link
Not functional
R100
Serial USB sniffer to cellular module
GPIO1 link
Not functional
R101
Cellular module USB VBUS link
Cellular module VUSB_DET
R102
Cellular module GPIO2 link
Link to the HostMCU PD_1 port
R103
Cellular module GPIO4 link
Not functional
R104
Cellular module USB Data_N signal link
Cellular module USB signal to J7 cellular module USB connector
R105
HostMCU USART1 Tx link
When removed isolates HostMCU USART1 Tx pin PA_9 from the
cellular module. Could be used in a configuration to drive the
cellular module from the serial USB sniffer directly.
R107
Cellular module USB Data_P signal link
Cellular module USB signal to J7 cellular module USB connector
R108
InterfaceMCU PSU EN reference
PSU EN voltage threshold voltage divider resistor
R111
HostMCU USART1 Rx link
When removed isolates HostMCU USART1 Rx pin PA_10 from the
cellular module
Could be used in a configuration to drive the cellular module from
the serial USB sniffer directly
R112
IC19 BQ27441 BIN link to LiPo battery
Provisional
R113
Cellular module I2C SCL link
Not functional
R114
Cellular module I2C SDA link
Not functional
R115
Cellular Module GPIO2 option
Cellular module GPIO2 to ground
R116
Cellular Module Pin 21 option
Cellular module Pin 21 to ground
R117
Cellular Module RSVD pin option
Cellular module RSVD pin to ground
R119
Arduino™ Uno R3 interface A5 pin I2C
provision
Link to Arduino™ Uno R3 interface SCL pin
R120
Arduino™ Uno R3 interface A4 pin I2C
provision
Link to Arduino™ Uno R3 interface SDA pin
R121
GNSS PPS LED G3 disable option
Link to LED
R123
GPS_RST net link
Provisional
R124
HostMCU 1.8V Backup Battery link
Links the 1.8V battery backed supply rail to the HostMCU 4 kB of
battery backed SRAM
R131
IC20 BQ24295 QON Pull down
Provisional

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Name
Function
Variant2
R412M
Description
R132
InterfaceMCU level translator OE to
3.3VDC
Links OE input of the level translator to 3.3VDC
R133
HostMCU USART2 virtual COM Rx link
Link to InterfaceMCU USART2 Rx signal through 1.8V to 3.3V
level translator
R134
HostMCU USART2 virtual COM Tx link
Link to InterfaceMCU USART2 Tx signal through 1.8V to 3.3V
level translator
R135
HostMCU external system clock (Osc.)
link
Link to 8 MHz clock generated from InterfaceMCU to drive the
HostMCU
R136
HostMCU USART2 USB sniffer Tx link
Link to serial USB sniffer Rx input
R137
HostMCU USART2 USB sniffer Rx link
Link to serial USB sniffer Tx output
R142
InterfaceMCU 3.3VDC supply sampling
Utilised for monitoring InterfaceMCU 3.3VDC supply level
R143
InterfaceMCU level translator OE GND
link
Links OE input of the level translator to GND to disable the
translator
R144
HostMCU PA_0 pull up
HostMCU PA_0-WKUP pin setting
R145
HostMCU BOOT1 pull up
HostMCU BOOT1 input setting to ‘1’
R146
HostMCU BOOT0 pull up
HostMCU BOOT0 input setting to ‘1’
R147
Serial USB sniffer reset link
Link between serial USB sniffer’s reset input to the application
section reset signal
R149
Cellular Module DTR pull down
SARA-R412M DTR input pull down
R150
The Si7034-A10 is a Temperature and
Relative Humidity Sensor power link
Link to 1.8VDC supply rail. See R48 link for utilization.
R151
Arduino™ interface 1.8V IO supply option
Provisional
R152
Arduino™ interface IOREF voltage level
selection for 3.3VDC
Link to Arduino™ interface 3.3V pin
R153
Arduino™ interface IOREF voltage level
selection for 5VDC
Link to Arduino™ interface 5V pin
R154
Arduino™ interface 5V pin to USB5V rail
USB5V supply link for Arduino™ interface
R160
M_GPIO3 net to PB8 link
Link to Arduino™ interface
R161
M_GPIO4 net to PB15 link
Link to Arduino™ interface
R162
GPS_PPS net to cellular module GPIO1
link
Link to SARA-R412M GPIO1
R164
IC22 output link to GNSS module
Provisional
R165
1V8_ZOE supply link to GNSS module
1.8V Supply rail to ZOE-M8B
R167
IC22 100k resistor
Provisional
R168
M_GPIO3 net link to cellular module
Link to SARA-R412M GPIO3
R170
M_VINT net link to cellular module GPIO5
Link to SARA-R412M GPIO5
R171
Arduino™ interface D5 pin to IC10 link
Provisional isolation
R172
IC10 A6 pin to PA5 link
Provisional isolation
R173
PA5 to Arduino™ interface D5 pin direct
link
Provisional
R174
USART1_TX net USB sniffer link
Link to S2 switch
R175
I_GNSS signal connection to Arduino™
interface A1
Provisional
R178
PC8 link to Arduino™ interface D4
Link to Arduino™ interface
R179
PB1 connection to Arduino™ interface D4
Provisional for backward compatibility
R180
Cellular module M_SCL net to Arduino™
interface SCL pin
Provisional
R181
Cellular module M_SDA net to Arduino™
interface SDA pin
Provisional

C030-R412M - User Guide
UBX-19010121 - R01 Hardware description Page 17 of 27
Name
Function
Variant2
R412M
Description
R182
U_GNSS signal connection to Arduino™
interface A2
Provisional
R183
VC Cellular supply rail connection to
Arduino™ interface A3
Provisional
R184
I_GNSS instrumentation signal link to
PB1
Provisional measurement signal
R185
USART1_Tx net to PD8 link
Link to Arduino™ interface
R186
USART1_Rx net to PD9 link
Link to Arduino™ interface
R187
SDCard Detect signal pull up
Provisional pull up for PE8
R7122
Arduino™ interface A0 to MCUWKUP net
Provisional
Table 4: C030-R412M HW configuration links and components
Figure 5: C030-R412M configuration links and components

C030-R412M - User Guide
UBX-19010121 - R01 Hardware description Page 18 of 27
2.6 Test, break out points, and debug interfaces
The C030-R412M has test and break out points to access key signals of the circuitry as well as
interface and Host MCU debug interfaces placed on the bottom side of the PCB for easy access. These
are listed in Table 5 and depicted in Figure 6.
Name
Signal
01
Cellular module supply voltage
02
GNSS module supply voltage
03
InterfaceMCU SWDCLK
04
InterfaceMCU SWDIO
05
InterfaceMCU reset
06
3.3 VDC supply for InterfaceMCU
07
OE signal for IC4 level translator between utility and application sections
08 to 19
N/A
20
1.8VDC supply for Host MCU
21
Host MCU SWDIO
22
Host MCU Reset
23
Host MCU SWDCLK
24
Host MCU BOOT0
44
Cellular module pin 44 break-out (SPK_P). Unused
45
Cellular module pin 45 break-out (SPK_N). Unused
46
Cellular module pin 46 break-out (MIC_BIAS). Unused
47
Cellular module pin 47 break-out (MIC_GND). Unused
48
Cellular module pin 48 break-out (MIC_N). Unused
49
Cellular module pin 49 break-out (MIC_P). Unused
RSVDS1
Cellular module pin 19 break-out (RSVD, Reserved). Unused
ST-SWD1
Tag-Connect-NL Plug-of-Nails™ connector compatible PCB touch points footprint for Interface MCU
SWD_TGT1
Tag-Connect-NL Plug-of-Nails™ connector compatible PCB touch points footprint for Host MCU
Table 5: C030-R412M test and break out points and debug interfaces
Figure 6: C030-R412M test and break out points and debug interfaces (bottom view)

C030-R412M - User Guide
UBX-19010121 - R01 Hardware description Page 19 of 27
2.7 Arduino™ UNO R3 compatible interface pin out
C030-R412M Arduino™ compatible interface details are given in Table 6 and shown in Figure 7.
Conn.
Pin
N°
Arduino
naming
Description
HostMCU port assignment
Alternate functions and notes
Ard1A
1
n.c.
Not connected
2
IOREF
IO reference voltage level.
Connected to 3.3 VDC
Could be used as input for external
IO level setting.
3
nR
Reset signal input.
Negative logic
4
3.3V
3.3 VDC supply output
Controlled by HostMCU Port PE_0
0: disable, 1:enable
5
5V
5 VDC Reference input
Could be used as IO Reference input
6
GND
Ground level
7
GND
Ground level
8
VIN
External DC supply input
In the range of 2.5 VDC to 5.5 VDC
See Jumper J1 in section 2.4
Ard1B
9
A0
Analog input
PA_3 Analog input6
GPIO, Ext. interrupt
10
A1
Analog input
PC_0 Analog input6
GPIO, Ext. interrupt
11
A2
Analog input
PC_3 Analog input6
GPIO, Ext. interrupt
12
A3
Analog input
PA_4 Analog input6
GPIO, Ext. interrupt
13
A4
Analog input
PA_6 Analog input6, PB_7 I2C1 SDA7
GPIO, Ext. interrupt
14
A5
Analog input
PB_0 Analog input6, PB_6 I2C1 SCL8
GPIO, Ext. interrupt
Ard1C
15
D0
Digital I/O, UART RX
PD_9, USART3_TX
GPIO, Ext. interrupt
16
D1
Digital I/O, UART TX
PD_8, USART3_RX
GPIO, Ext. interrupt
17
D2
Digital I/O
PD_11
USART3_CTS, GPIO, External
interrupt
18
D3
Digital I/O
PB_14
USART3_RTS, GPIO, PWM, Ext.
interrupt
19
D4
Digital I/O
PC_8
GPIO, PWM, Ext. interrupt
20
D5
Digital I/O
PA_5
GPIO, PWM, Ext. interrupt
21
D6
Digital I/O
PB_8
GPIO, PWM, Ext. interrupt
22
D7
Digital I/O
PB_15
GPIO, PWM, Ext. interrupt
Ard1D
23
D8
Digital I/O
PD_15
GPIO, Ext. interrupt
24
D9
Digital I/O
PD_12
GPIO, Ext. interrupt
25
D109
Digital I/O
PE_11, SPI4 NSS, shared with SD Card
GPIO, PWM, Ext. interrupt
26
D11
Digital I/O
PE_6, SPI4 MOSI, shared with SD Card
GPIO, PWM, Ext. interrupt
27
D12
Digital I/O
PE_5, SPI4 MISO, shared with SD Card
GPIO, PWM, Ext. interrupt
28
D13
Digital I/O
PE_2, SPI4 SCK, shared with SD Card
GPIO, Ext. interrupt
29
GND
Ground level
30
AREF
3.3 VDC reference
31
SDA
I2C SDA I/O
PB_6 I2C1 SCL
GPIO, Ext. interrupt
32
SCL
I2C SCL Output
PB_7 I2C1 SDA
GPIO, Ext. interrupt
Table 6: C030-R412M Arduino UNO R3 compatible interface
6
Pin is connected to the port via 1 kΩ/1 kΩresistive voltage divider.
7
PB_7 could be connected to the (A4) Ard1B pin 13 to provide I2C1 SDA signal.
8
PB_6 could be connected to the (A5) Ard1B pin 14 to provide I2C1 SCL signal.
9
Arduino interface D10 to D13 pins are used as an SPI Bus to HostMCU SPI4 peripheral. The D10 to D13 pins are shared with the
SD card socket.

C030-R412M - User Guide
UBX-19010121 - R01 Hardware description Page 20 of 27
Figure 7: C030-R412M Arduino™ UNO R3 connectors
2.8 Power supply options and LiPo battery usage
The C030-R412M can be powered up from several resources, individually or all together. The power
supply usage configurations are provided in Table 7.
#
Connector
Description
1
Debug USB
Uses development PC’s USB 5 VDC VBUS to power up the utility and application sections of
the C030-R412M. It charges up the LiPo battery if it is connected.
2
Aux 5V USB
Auxiliary USB power input. A USB power supply could be connected to power up only the
application section of the C030-R412M.
It charges up the LiPo battery if it is connected. There is no communication functionality.
3
Serial USB sniffer
Uses Development PC’s USB 5 VDC VBUS to power up only the application section of the
C030. It charges up the LiPo battery if it is connected. The serial USB sniffer circuitry could
only be powered from its dedicated USB connector.
4
LiPo battery
The C030 application section could run only from a LiPo Battery connected. If one or many
of the #1, #2, #3 USB connections are available. The LiPo Battery is charged up as well.
5
Arduino™ UNO R3 VIN Pin 8
Arduino™ UNO R3 VIN pin 8 could be used to power up entire the C030 application section
except serial USB sniffer circuitry. STLink (or CMSIS-DAP when available) feature could be
used through the debug USB. However, the C030-R412M application section including LiPo
Battery management circuitry is disconnected.
The VIN input voltage should be in the range of 2.5 VDC to 5.5 VDC.
Table 7: C030 power supply options and LiPo battery usage
☞The C030-R412M could run on a single supply input from #1 debug USB or #3 serial USB sniffer.
However, the cellular module transmission power demand might not be satisfied from these
connections. In such a use case, the C030-R412M might suffer brownout due to USB VBUS supply
rail cuts because of USB current limitations. Therefore, either a 5 VDC USB power supply with
~3 ADC capacity should be connected to the Aux 5V USB connector and/or an adequate LiPo
battery, such as a BAK LP-503759-IS-3, should be connected to the LiPo battery connector. The
locations of the power supply connections are shown in Figure 8.
It is recommended to use a LiPo battery in addition to the USB connections, because high
frequency current demands might not be provided by the USB VBUS rails.
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