GHI Electronics, LLC
501 E. Whitcomb Ave.
Madison Heights, Michigan 48071
Phone: (248) 397-8856
Fax: (248) 397-8890
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G120 and G120E SoM Datasheet
G120 SoM
G120E SoM
Where Hardware Meets Software
GHI Electronics, LLC
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Introduction
G120 and G120E SoM Datasheet
Contents
Introduction ..........................................................................................................................................................4
2.1
G120 vs G120E .............................................................................................................................................4
2.2
Key Features .................................................................................................................................................5
2.3
Example Applications ...................................................................................................................................5
The .NET Micro Framework ..................................................................................................................................6
3.1
GHI Electronics and NETMF..........................................................................................................................6
Pinout Tables ........................................................................................................................................................7
4.1
G120 Pinout .................................................................................................................................................7
4.2
G120E Pinout................................................................................................................................................8
Reference Design ..................................................................................................................................................9
Device Startup .....................................................................................................................................................10
Libraries ..............................................................................................................................................................11
7.1
General Purpose Input and Output (GPIO) ................................................................................................11
7.2
Analog Input ...............................................................................................................................................11
7.3
Analog Output ............................................................................................................................................11
7.4
Pulse Width Modulation (PWM) ................................................................................................................11
7.5
Signal Generator ........................................................................................................................................11
7.6
Signal Capture ............................................................................................................................................12
7.7
Pulse Feedback ...........................................................................................................................................12
7.8
Universal Asynchronous Receiver Transmitter (UART) ..............................................................................12
7.9
Serial Peripheral Interface (SPI) .................................................................................................................12
7.10
Inter-Integrated Circuit (I2C) ......................................................................................................................12
7.11
Controller Area Network (CAN) ..................................................................................................................12
7.12
1-Wire ........................................................................................................................................................12
7.13
Graphics .....................................................................................................................................................12
7.14
Touch Screen ..............................................................................................................................................13
7.15
USB Host .....................................................................................................................................................13
7.16
USB Client ...................................................................................................................................................13
7.17
File System .................................................................................................................................................13
7.18
Networking .................................................................................................................................................13
7.18.1
Ethernet .............................................................................................................................................13
7.18.2
Wi-Fi ..................................................................................................................................................13
7.18.3
Point to Point.....................................................................................................................................14
7.19
Extended Weak References .......................................................................................................................14
7.20
Configuration .............................................................................................................................................14
7.21
Real Time Clock ..........................................................................................................................................14
7.22
Watchdog ...................................................................................................................................................14
7.23
Power Control ............................................................................................................................................14
7.24
In-Field Update ...........................................................................................................................................14
7.25
SQLite Database .........................................................................................................................................14
7.26
Direct Memory Access ...............................................................................................................................15
7.27
Battery RAM ...............................................................................................................................................15
7.28
EEPROM .....................................................................................................................................................15
7.29
Runtime Loadable Procedures ...................................................................................................................15
Design Considerations ........................................................................................................................................16
8.1
Required Pins .............................................................................................................................................16
8.2
Power Supply .............................................................................................................................................16
8.3
Crystals .......................................................................................................................................................16
8.4
Interrupt Pins .............................................................................................................................................16
8.5
Reset ..........................................................................................................................................................16
8.6
SPI Channels ...............................................................................................................................................16
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Introduction
G120 and G120E SoM Datasheet
8.7
Ethernet .....................................................................................................................................................16
8.8
Direct Memory Access ...............................................................................................................................16
9
Footprints............................................................................................................................................................18
9.1
G120 Recommended Footprint..................................................................................................................18
9.2
G120E Recommended Footprint ................................................................................................................19
10 Soldering the G120 .............................................................................................................................................20
10.1
Oven Reflow ...............................................................................................................................................20
11 Legal Notice ........................................................................................................................................................21
11.1
Licensing .....................................................................................................................................................21
11.2
Trademarks ................................................................................................................................................21
11.3
Disclaimer ...................................................................................................................................................21
12 Revision History ..................................................................................................................................................22
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2
Introduction
G120 and G120E SoM Datasheet
Introduction
The G120 SoMs are powerful, low-cost, surface-mount System on Modules (SoM) running Microsoft's .NET Micro
Framework. The .NET Micro Framework enables the SoM to be programmed from Microsoft Visual Studio using a
USB or serial cable. Programming in a modern managed language, such as C# or Visual Basic, allows developers to
accomplish more work in less time by taking advantage of the extensive built-in libraries for networking, file
systems, graphical interfaces, and more.
A simple two-layer circuit board with a power source and a few connectors can utilize the G120 SoMs to bring the
latest technologies to any product. There are no additional licensing or other fees and all the development tools
are provided freely.
Throughout this document, the G120 SoM and the G120E SoM will be referred to as the G120 and G120E,
respectively. When only G120 is listed, the information applies to the G120E as well unless specified otherwise.
For more information and support, please see https://www.ghielectronics.com/support/netmf and the product
catalog entry. For advanced electrical characteristics and details on the underlying LPC1788FET processor, please
consult the processor’s datasheet.
2.1
G120 vs G120E
The G120 comes in a standard and an extended format. They are not pinout compatible. The below table lists the
differences.
G120
G120E
Processor
NXP LPC1788FET180
NXP LPC1788FET208
Package
91 pin surface-mount module (SMT)
105 pin surface-mount module (SMT)
Dimensions
26.7 x 38.1 x 3.5 mm
45.75 x 39.4 x 4.4 mm
RTC
External 32,768 Hz crystal required
Included
GPIO
72
80
SPI
3
Ethernet
ENC28J60 over SPI
2
ENC28J60 over SPI and/or
Built in base 100 Ethernet PHY
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2.2
Introduction
G120 and G120E SoM Datasheet
Key Features
2.3
.NET Micro Framework
RoHS Lead Free
120 MHz ARM Cortex-M3 NXP LPC1788
6 Mbytes available RAM
2.3 Mbytes available flash
Embedded LCD controller
72 to 80 GPIO
43 interrupt capable GPIO
2 to 3 SPI
1 I2C
5 UART
2 CAN
12 PWM
8 12-bit analog input
1 10-bit analog output
4-bit SD/MMC memory card interface
Low power modes
-40°C to +85°C operational
RTC
Watchdog
Threading
USB host
USB client
SQLite database
TCP/IP with SSL
o Full .NET socket interface
o Ethernet
o Wi-Fi
o PPP
Graphics
o Images
o Fonts
o Controls
File System
o Full .NET file interface
o SD cards
o USB drives
Native extensions
o Runtime Loadable Procedures
o Device register access
Signal controls
o Generation
o Capture
o Pulse measurement
Example Applications
Vending machines
POS Terminals
Measurement tools and testers
Networked sensors
Robotics
Central alarm system
Smart appliances
Industrial automation devices
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The .NET Micro Framework
G120 and G120E SoM Datasheet
The .NET Micro Framework
Inspired by the full .NET Framework, Microsoft developed a lightweight version called .NET Micro Framework
(NETMF). NETMF focuses on the specific requirements of resource-constrained embedded systems. Development,
debugging, and deployment are all conveniently performed using Microsoft's powerful Visual Studio through a
standard USB or serial cable.
Programming is done in C# or Visual Basic with libraries that cover sockets, memory management with garbage
collection, advanced file system support, multitasking services, and many others. In addition to supporting many
standard .NET features, NETMF has additional embedded extensions supporting microcontroller specific needs
such as PWM outputs and analog inputs.
3.1
GHI Electronics and NETMF
Since signing the partnership agreement with Microsoft in 2008, GHI Electronics has become the leading Microsoft
partner on NETMF through its work on integrating and extending the NETMF core. GHI Electronics's NETMF
products are extended with important features extending the NETMF libraries such as databases, USB Host, Wi-Fi,
and native programming.
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Pinout Tables
G120 and G120E SoM Datasheet
Pinout Tables
Many signals on the G120 are multiplexed to offer multiple functions on a single pin. Developers can decide on the
pin functionality to be used through the provided libraries. Any pin with no name, function, or note must be left
unconnected.
4.1
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
G120 Pinout
Name
P2.4
P2.8
P0.0
P0.10
P2.11
P2.10
P0.11
P0.1
P0.18
P0.16
P0.15
P0.22
P0.17
P2.1
P0.6
P2.0
P1.12
P1.11
P1.7
P1.2
P1.6
P1.3
P0.5
P0.4
P4.28
Function
GND
3.3 V
PWM10
LCD OE
LCD R3
CAN1 RD
COM3 TX
LDR0
COM3 RX
CAN1 TD
SPI1 MOSI
COM2 RX
SPI1 SCK
LDR1
COM2 CTS SPI1 MISO
MODE
COM2 RTS COM2 OE
COM2 TX
SPI2 SCK
SPI2 MISO
SPI2 MOSI
SD D3
PWM5
SD D2
PWM4
SD D1
PWM0
SD CLK
PWM3
SD D0
GND
PWM1
SD CMD
CAN2 TD
CAN2 RD
COM4 TX
Pin
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
592
60
611
62
Name
P4.29
P1.14
P1.17
P1.16
P1.15
P1.9
P1.10
P1.4
P1.8
P1.1
P1.0
P0.3
P0.2
P0.26
P0.24
P0.25
P0.23
P3.26
P0.13
P0.12
P1.30
P0.28
P1.31
Function
COM4 RX
SPI3 MISO
SPI3 MOSI
SPI3 SCK
TOUCH XR
TOUCH YD
GND
3.3 V
COM1 RX
COM1 TX
ADC3
DAC0
ADC1
TOUCH YU
ADC2
ADC0
TOUCH XL
RESET
PWM8
ADC7
ADC6
RTC CRYSTAL 1
RTC CRYSTAL 2
ADC4
COM4 OE
VBAT
I2C SCL
ADC5
Pin
631
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
Name
P0.27
P3.25
P3.24
P2.21
P1.22
P1.21
P1.19
P1.23
P1.24
P1.20
P1.25
P1.26
P1.28
P1.29
P1.27
P2.13
P2.12
P2.5
P2.2
P2.7
P2.9
P2.6
P2.3
P1.5
Function
I2C SDA
PWM7
PWM6
USBC D+
USBC DUSBH DUSBH D+
LCD G2
LCD G1
COM3 OE
LCD G3
LCD G4
LCD G0
LCD G5
LCD B1
LCD B3
LCD B4 COM5 TX
GND
LCD B2
LCD B0
LCD R0
LCD HS PWM11
LCD CLK
LCD R2
LCD R4 COM5 RX
LCD R1
LCD VS
PWM9
PWM2
1
Open drain requiring a 2.2 kΩ pull-up resistor
Must not be low on startup
2
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4.2
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
141
151
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Pinout Tables
G120 and G120E SoM Datasheet
G120E Pinout
Name
P0.4
P0.5
P0.3
P0.2
P0.22
P0.24
P0.25
P0.26
P0.23
P4.29
P4.28
P0.28
P0.27
P3.16
P3.24
P3.25
P1.19
P2.21
P2.25
P2.22
P0.1
P2.26
P0.0
P1.30
P2.27
Function
3.3 V
GND
CAN2 RD
CAN2 TD
COM1 RX
COM1 TX
LDR1
TOUCH YU
ADC1
COM4 TX
ADC2
COM4 RX ADC3 DAC0
TOUCH XL
ADC0
I2C SCL
I2C SDA
PWM0
PWM6
PWM7
CAN1 TD
CAN1 RD
ADC4
VBAT
USBH DUSBH D+
ADC6
ADC7
ADC5
3.3 V
PWM9
P0.12
P0.13
P1.31
P3.27
Pin
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
Name
Function
GND
3.3 V
P3.30
P3.26
P3.17
P0.18
P0.17
P2.30
P0.15
P0.11
P0.10
P2.10
P0.6
P0.16
P2.31
P3.18
P2.0
P1.12
P1.11
P1.7
P1.2
P1.6
P1.3
PWM8
PWM1
USBC DUSBC D+
ETH PHY RDETH PHY RD+
ETH PHY TDETH PHY TD+
SPI1 MOSI
SPI1 MISO
SPI1 SCK
COM3 RX
COM3 TX
LDR0
COM2 RTS
COM2 RX
COM2 CTS PWM2
SPI2 SCK
SPI2 MOSI
COM2 TX
SPI2 MISO
SD D3
SD D2
SD D1
SD CLK
SD D0
SD CMD
SD PWR
GND
RESET
Pin
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
T15
T16
T17
T18
T19
T20
Name
P3.22
P2.1
P2.23
P3.31
P3.29
P4.31
P3.19
P3.20
P3.21
P3.28
P2.12
P2.6
P2.7
P2.8
P2.9
P1.20
P1.21
P1.22
P1.23
P1.24
P1.25
P2.13
P1.26
P1.27
P1.28
P1.29
P2.2
P2.4
P2.5
P2.3
Function
MODE
TOUCH XR
TOUCH YD
PWM11
PWM3
PWM4
PWM5
PWM10
ETH PHY SPEED
ETH PHY LINK
GND
LCD R0
LCD R1
LCD R2
LCD R3
LCD R4 COM5 RX
LCD G0
LCD G1
LCD G2
LCD G3
LCD G4
LCD G5
LCD B0
LCD B1
LCD B2
LCD B3
LCD B4 COM5 TX
LCD CLK
LCD OE
LCD HS
LCD VS
1
Open drain requiring a 2.2 kΩ pull-up resistor
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Reference Design
G120 and G120E SoM Datasheet
Reference Design
The G120E Dev Board is an excellent starting point and reference design for anyone interested in evaluating and
developing with the G120. See the product catalog entry for more information and additional resources.
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Device Startup
G120 and G120E SoM Datasheet
Device Startup
The G120 is held in reset when the reset pin is low. Releasing it will begin the system startup process. It is pulled
high internally on the G120E and left floating on the G120.
There are four different components of the device firmware:
1.
2.
3.
4.
GHI Bootloader: initializes the system, updates TinyBooter when needed, and executes TinyBooter.
TinyBooter: executes TinyCLR, updates TinyCLR when needed, and updates the system configuration.
TinyCLR: loads, debugs, and executes the managed application.
Managed application: the program developed by the customer.
Which components get executed on startup can be control by manipulating the LDR0 and LDR1 pins. LDR0 and
LDR1 are pulled high on startup.
LDR0
LDR1
Effect
Ignored
High
Execute the managed application.
High
Low
Wait in TinyBooter
Low
Low
Wait in GHI Bootloader
Additionally, the communications interface between the host PC and the G120 is selected on startup through the
MODE pin, which is pulled high on startup.
MODE
G120
G120E
High
USB
COM1
Low
COM1
USB
The above discussed functions of LDR0, LDR1, and MODE are only during startup. After startup, they return to the
default GPIO state and are available to use as GPIO in the user application.
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Libraries
G120 and G120E SoM Datasheet
Libraries
Similar to the full .NET Framework, NETMF includes many built in libraries to help in modern application
development with additional libraries to support embedded systems.
Please see https://www.ghielectronics.com/support/netmf for more information.
7.1
General Purpose Inpu t and Output (GPIO)
GPIOs can read and write logical high and low signals. Keep the following in mind:
7.2
They default to inputs with internal weak pull-up resistors
They operate on 3.3 V logic levels.
They are 5 V tolerant when not in analog mode.
They have controllable pull up and pull down resistors.
Only pins on ports 0 and 2 are interrupt capable.
Individual pins can source or sink up to 4 mA (see the processor’s documentation for advanced
information).
Analog Input
Analog inputs can read voltages from 0 V to 3.3 V with 12-bit resolution. The built in analog circuitry uses the
source voltage as a reference which can cause some noise on the analog signal. High accuracy ADCs with a
dedicated reference can be added externally.
7.3
Analog Output
Analog outputs can vary their voltage from 0 V to 3.3 V with 10-bit resolution. The output voltage is meant to be
used as a signal and not a driver. An op-amp or similar circuit can be used to amplify the current.
7.4
Pulse Width Modulation (PWM)
PWM is used to create a waveform with a specified frequency and duty cycle. It uses built-in hardware so no
processing resources are needed to keep it running. Frequencies can range from 1 Hz to 30 MHz.
Some PWM channels share the same source clock internally. Changing the frequency on a channel will affect other
channels; however, they can have a separate duty cycle.
7.5
Channel
Timer
0 to 5
0
6 to 11
1
Signal Generator
Signal Generator is used to generate a waveform on any GPIO with varying frequency and duty cycle. The feature is
software driven and can generate frequencies up to 40 kHz ±10%. More processing time is required for higher
frequencies.
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7.6
Libraries
G120 and G120E SoM Datasheet
Signal Capture
Signal Capture monitors any GPIO and records the time from the last change. This feature is software driven and
can measure frequencies up to 100 kHz ±10%. Lower frequencies have higher accuracy.
7.7
Pulse Feedback
Pulse Feedback is used for sensing capacitance on any GPIO input and measuring pulses from ultrasonic distance
and other sensors. When used for sensing capacitance, a 100 pF capacitor and 1 resistor between the pad and
ground are recommended.
7.8
Universal Asynchronous Receiver Transmitter (UART)
UART is a common, full duplex, communications interface. Baud rates from 1,200 to 921,600 are supported.
Handshaking is supported on COM2 only. Data bits between 5 and 8 are supported. Stop bits of 1 and 2 are
supported, 2 stop bits are not supported with five data bits. Space, mark, even, and odd parities are supported.
7.9
Serial Peripheral Interface (SPI)
SPI is a common three or four wire serial interface. The G120 can act as a SPI bus master only. The maximum
supported clock is 30 MHz and all four SPI modes are supported. The SPI bus is designed to interface with multiple
SPI slave devices. The active slave is selected by asserting the chip select line on the slave device.
SPI2 is shared internally with the flash memory on the G120. Use of a chip select with devices on this channel is
required or the G120 will not function properly. The use of another SPI channel is recommended.
7.10 Inter-Integrated Circuit (I2C)
I2C is a two-wire addressable serial interface. The G120 can act as an I2C bus master only with 7-bit slave
addresses. It can connect to one or more slave devices over the same connection with a maximum clock of 400
kHz. The I2C bus interface requires pull up resistors to be added on both the SCL and SDA pins, usually 2.2 kΩ.
It is possible to simulate an independent I2C bus on any two GPIO pins with the appropriate resistors though the
software I2C class, but performance will be lower.
7.11 Controller Area Network (CAN)
CAN is a common interface in industrial control and the automotive industry. CAN on the G120 is compliant with
the CAN 2.0B specifications. Bitrates up to 1 Mbit/s are supported. For systems with higher traffic, different
message filter options are available.
7.12 1-Wire
Through 1-Wire, a master can communicate with multiple 1-Wire slaves using any GPIO.
7.13 Graphics
The G120 supports 16-bit color TFT displays up to 800x600. Displays require the horizontal sync, vertical sync,
clock, enable, and the 16 color lines. The color format is 565 (5 bits for red, 6 bits for green, and 5 bits for blue). If
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Libraries
G120 and G120E SoM Datasheet
the display has more than 16 color lines, connect the most significant color lines to the G120 and the remaining
lines to ground.
While SPI displays can be utilized as well, the native TFT interface is recommended as it allows for a faster update
rate.
NETMF includes support for drawing though the bitmap object. TrueType font files can be used once converted to
the TinyFont format used by NETMF.
7.14 Touch Screen
The G120 supports displays with four-wire restive touch without the need for any additional hardware, though
using an external controller is possible. The default touch pins can be remapped if required. Capacitive touch
displays can be used through the I2C interface.
7.15 USB Host
USB host allows the use of USB mass storage devices, joysticks, keyboards, and mice. Additionally, for USB devices
that do not have a standard class included, low level USB access is provided for bulk transfers. USB hubs are
supported allowing multiple devices to be connected.
7.16 USB Client
The USB client interface is typically used as the G120 debug interface and for application deployment through
Visual Studio. However, it is controllable and may be used to simulate other USB devices such as mice, keyboards,
and Communications Device Class (CDC) interfaces using low level access instead of the debug interface.
7.17 File System
The G120 supports accessing files on SD cards and USB memory devices formatted as FAT16 or FAT32. SD cards
use a true 4-bit interface. MMC/SD/SDHC/SDXC cards in full, mini, and micro formats and any USB device with
mass storage class are supported. Access speeds are dependent on many different factors and can be up to 500
Kbyte/s.
7.18 Networking
The G120 supports Ethernet, Wi-Fi, and PPP. The full stack includes TCP, UDP, DHCP, DNS, HTTP, FTP, and others.
Secure connections can be created using the built in SSL stack.
7.18.1 Ethernet
Ethernet support is available using the built-in NETMF TCP/IP and SSL stack through the on-board base-100
Ethernet PHY on the G120E and through an external ENC28J60 SPI Ethernet chip on both the G120 and the G120E.
7.18.2 Wi-Fi
Any Wi-Fi module with a built-in TCP/IP stack can be used with the G120. However, these modules are typically
limited. Through the supported Redpine RS9110-N-11-22-04 and RS9110-N-11-22-05 chips, Wi-Fi is usable with the
built-in NETMF TCP/IP and SSL stacks.
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Libraries
G120 and G120E SoM Datasheet
7.18.3 Point to Point
The Point to Point (PPP) protocol is often used for devices needing to connect to mobile networks. While typical
embedded devices use the mobile modem's built-in and very limited TCP/IP stack, systems using the G120 can use
these modems with the internal NETMF TCP/IP and SSL stack.
7.19 Extended Weak References
Extended Weak References are a way for managed applications to store data in non-volatile memory. This is meant
to be used as a configuration store that does not change frequently where the data can be recreated if needed.
There are 128 KBytes available for use.
7.20 Configuration
Access to the configuration sector of the device is provided for storage of small, infrequently changing, entries. The
data will be lost if the configuration is reflashed. Space is limited and varies based on other information stored in
the configuration.
7.21 Real Time Clock
The real time clock (RTC) is used to keep time while the processor is off, drawing its power from a 3 V backup
battery or super capacitor providing 3 V. An appropriate 32,768 Hz crystal and its associated circuitry must be
connected to the G120 for the RTC to function. It is included on the G120E.
7.22 Watchdog
Watchdog is used to reset the system if it enters an erroneous state. The G120 supports timeouts between 1 ms
and 134,217 ms. Watchdog support is included through the GHI Electronics libraries replacing the built in NETMF
version.
7.23 Power Control
The G120 supports entering sleep, deep sleep, and off modes in order to reduce power usage. It can consume as
little as 120 mA in sleep, 18 mA in deep sleep, and 12 mA in off. It may be woken from an RTC alarm or a GPIO
interrupt. Sleep pauses execution of the program. Deep sleep pauses execution of the program and shuts down
many internal functions. Off shuts down all internal functions and can only be woken by the RTC alarm or a system
reset. The system will be automatically reset when exiting off mode.
7.24 In-Field Update
Through In-Field Update, the G120 can update its firmware and managed application. The update can come from
the network, a bus, or connected media.
7.25 SQLite Database
SQLite can be used to created databases that can be stored in memory or on a supported storage device such as a
USB drive or SD card.
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Libraries
G120 and G120E SoM Datasheet
7.26 Direct Memory Access
Low level device registers and memory can be accessed to further configure the G120’s underlying processor. Not
all functionality of the processor is available as some functions may be used or configured internally for use in
NETMF.
7.27 Battery RAM
Battery-backed RAM is provided as part of the internal RTC. This memory retains its contents when the power is
lost as long as there is a backup battery. There are 20 bytes of battery backed RAM available. Consult the
processor's documentation for details on use.
7.28 EEPROM
The G120 has a built-in EEPROM. Consult the processor's documentation for details on use.
7.29 Runtime Loadable Procedure s
Similar to code loaded from a DLL, Runtime Loadable Procedures (RLP) allows a binary or ELF image to be loaded
into memory and executed on the device. This is useful for advanced and critical performance scenarios. The RLP
region starts at address 0xA0F00000 and is 0x000FFFFC bytes in size. Your compiled images must fall completely
within that range.
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8
Design Considerations
G120 and G120E SoM Datasheet
Design Considerations
8.1
Required Pins
Exposing the following pins is required in every design to enable device programming, updates, and recovery:
8.2
LDR0
LDR1
Desired debug interface(s)
MODE if required to select a debug interface
Power Supply
A typical clean power source, suited for digital circuitry, is needed to power the G120. Voltages should be within at
least 10% of the needed voltage. Decoupling capacitors of 0.1 μF are needed near every power pin. Additionally, a
large capacitor, typically 47 μF, should be near the G120 if the power supply is more than few inches away.
8.3
Crystals
The G120 and G120E include the needed system crystal and its associated circuitry. The G120E additionally
includes the RTC crystal and its associated circuitry. However, the G120 does not. It requires an external 32,768 Hz
crystal and circuitry for the RTC to function. Please see the processor’s documentation for advanced information.
8.4
Interrupt Pins
Only pins on ports 0 and 2 support interrupts.
8.5
Reset
The G120E includes an internal pull-up resistor on the reset pin. The G120 does not, so an external 15 kΩ pull-up
resistor is required for correct operation.
8.6
SPI Channels
SPI2 is shared internally with the flash memory on the G120. Use of a chip select with devices on this channel is
required or the G120 will not function properly. The use of another SPI channel is recommended.
8.7
Ethernet
The built in Ethernet available on the G120E includes all needed Ethernet circuitry internally. However, an
appropriate magnet and connector, like the J0011D or similar, are required.
8.8
Direct Memory Access
Most of the core processor’s resources are used by NETMF. Some resources are permanently used, like the main
system timer while others are used when specific features, like the timers for PWM, are enabled. Used resources
can change from one firmware version to another so care must be taken when using these resources through RLP
or other direct memory access methods.
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Design Considerations
G120 and G120E SoM Datasheet
When absolutely required, applications can use resources in conjunction with NETMF. For example, creating a
special baud rate, utilizing the timer capture feature, and making use of many other features supported by the
processor. Please contact GHI Electronics’s consulting services to determine exactly what resources are available
and if the G120 can fulfill the specific requirements.
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9
Footprints
G120 and G120E SoM Datasheet
Footprints
We recommend no traces or vias under the module. Dimensions are in inches.
9.1
G120 Recommended Footprint
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9.2
Footprints
G120 and G120E SoM Datasheet
G120E Recommended Footprint
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Soldering the G120
G120 and G120E SoM Datasheet
10 Soldering the G120
The G120 is designed to be easily machine-placed or hand-soldered. Static sensitive precautions should be taken
when handling the module.
10.1 Oven Reflow
The G120 is not sealed for moisture. Baking the module before reflow is recommended and required in a humid
environment. The process of reflow can damage the G120 if the temperature is too high or exposure is too long.
The lead-free reflow profile used by GHI Electronics is shown below. The profiles shown are based on SAC 305
solder (3% silver, 0.5% copper). The thermal mass of the assembled board and the sensitivity of the components
on it affect the total dwell time. Differences in the two profiles are where they reach their respective peak
temperatures as well as the time above liquids (TAL). The shorter profile applies to smaller assemblies, whereas
the longer profile applies to larger assemblies such as back-planes or high-density boards. The process window is
described by the shaded area. These profiles are only starting-points and general guidance. The particulars of an
oven and the assembly will determine the final process.
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Legal Notice
G120 and G120E SoM Datasheet
11 Legal Notice
11.1 Licensing
The G120 SoM and G120E SoM, with all their built-in software components, are licensed for commercial and noncommercial use. No additional fee or licensing is required. Software, firmware, and libraries provided for the G120
SoM and the G120E SoM are licensed to be used on the G120 SoM and the G120E SoM only.
11.2 Trademarks
G120 and G120E are trademarks of GHI Electronics, LLC.
.NET Micro Framework and Visual Studio are registered or unregistered trademarks of Microsoft Corporation.
Other registered or unregistered trademarks are owned by their respective companies.
11.3 Disclaimer
IN NO EVENT SHALL GHI ELECTRONICS, LLC BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS PRODUCT, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE. GHI ELECTRONICS, LLC LINE OF PRODUCTS ARE NOT DESIGNED FOR LIFE SUPPORT APPLICATIONS.
SPECIFICATIONS AND AVAILABILITY ARE SUBJECT TO CHANGE WITHOUT ANY NOTICE.
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Revision History
G120 and G120E SoM Datasheet
12 Revision History
Revision
Date
Change
1.1
2016-06-22
Fixed MODE default state.
1.0
2015-11-12
Initial release.
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