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G80 SoC Datasheet
Where Hardware Meets Software
GHI Electronics, LLC
1
Introduction
G80 SoC Datasheet
Contents
2
Introduction ..........................................................................................................................................................3
2.1
Key Features .................................................................................................................................................3
2.2
Example Applications ...................................................................................................................................3
3
The .NET Micro Framework ..................................................................................................................................4
3.1
GHI Electronics and NETMF..........................................................................................................................4
4
Pinout Table ..........................................................................................................................................................5
5
Reference Design ..................................................................................................................................................6
6
Device Startup .......................................................................................................................................................7
7
Libraries ................................................................................................................................................................8
7.1
General Purpose Input and Output (GPIO) ..................................................................................................8
7.2
Analog Input .................................................................................................................................................8
7.3
Analog Output ..............................................................................................................................................8
7.4
Pulse Width Modulation (PWM) ..................................................................................................................8
7.5
Signal Generator ..........................................................................................................................................9
7.6
Signal Capture ..............................................................................................................................................9
7.7
Pulse Feedback .............................................................................................................................................9
7.8
Universal Asynchronous Receiver Transmitter (UART) ................................................................................9
7.9
Serial Peripheral Interface (SPI) ...................................................................................................................9
7.10
Inter-Integrated Circuit (I2C) ........................................................................................................................9
7.11
Controller Area Network (CAN) ....................................................................................................................9
7.12
1-Wire ..........................................................................................................................................................9
7.13
Graphics .....................................................................................................................................................10
7.14
Touch Screen ..............................................................................................................................................10
7.15
USB Host .....................................................................................................................................................10
7.16
USB Client ...................................................................................................................................................10
7.17
File System .................................................................................................................................................10
7.18
Networking .................................................................................................................................................10
7.18.1
Ethernet .............................................................................................................................................10
7.18.2
Wi-Fi ..................................................................................................................................................10
7.18.3
Point to Point.....................................................................................................................................10
7.19
Configuration .............................................................................................................................................11
7.20
Real Time Clock ..........................................................................................................................................11
7.21
Watchdog ...................................................................................................................................................11
7.22
Power Control ............................................................................................................................................11
7.23
Direct Memory Access ...............................................................................................................................11
7.24
Battery RAM ...............................................................................................................................................11
8
Design Considerations ........................................................................................................................................12
8.1
Required Pins .............................................................................................................................................12
8.2
Power Supply .............................................................................................................................................12
8.3
Crystals .......................................................................................................................................................12
8.4
Interrupt Pins .............................................................................................................................................12
8.5
Reset ..........................................................................................................................................................12
8.6
Direct Memory Access ...............................................................................................................................12
9
Legal Notice ........................................................................................................................................................13
9.1
Licensing .....................................................................................................................................................13
9.2
Trademarks ................................................................................................................................................13
9.3
Disclaimer ...................................................................................................................................................13
10 Revision History ..................................................................................................................................................14
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2
Introduction
G80 SoC Datasheet
Introduction
The G80 SoC is a powerful, low-cost, surface-mount LQFP100 System on Chip (SoC) running Microsoft's .NET Micro
Framework. The .NET Micro Framework enables the SoC 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 G80 SoC 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 G80 SoC will be referred to as the G80.
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 STM32F427VGT6 processor,
please consult the processor’s datasheet.
2.1
Key Features
2.2
.NET Micro Framework
RoHS Lead Free
180 MHz ARM Cortex-M4 STM32F427VGT6
156 Kbytes available RAM
256 Kbytes available flash
78 GPIO
16 interrupt capable GPIO
2 SPI
1 I2C
4 UART
2 CAN
26 PWM
16 12-bit analog input
2 12-bit analog output
4-bit SD/MMC memory card interface
Low power modes
-40°C to +85°C operational
LQFP100 14 x 14 mm
RTC
Watchdog
Threading
USB host
USB client
TCP/IP
o Full .NET socket interface
o Ethernet
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 Device register access
Signal controls
o Generation
o Capture
o Pulse measurement
Example Applications
Vending machines
POS Terminals
Measurement tools and testers
Networked sensors
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Robotics
Central alarm system
Smart appliances
Industrial automation devices
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3
The .NET Micro Framework
G80 SoC 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 Table
G80 SoC Datasheet
Pinout Table
Many signals on the G80 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.
1
2
3
4
5
6
75
85
95
10
11
12
13
14
15
16
17
18
19
206
21
226
23
24
25
26
27
28
29
30
31
32
33
34
PE2
PE3
PE4
PE5
PE6
LDR0
LDR1
VBAT
PC13
PC14
PC15
PC0
PC1
PC2
PC3
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PC4
PC5
RTC XTAL IN
RTC XTAL OUT
GND
3.3 V
SYS XTAL IN
SYS XTAL OUT
RESET
ADC10
ADC11
ADC12
SPI2 MISO
ADC13
SPI2 MOSI
3.3 V
GND
3.3 V
3.3 V
ADC0
COM4 TX
ADC1
COM4 RX
ADC2
PWM20
ADC3
PWM21
GND
3.3 V
ADC4
DAC1
ADC5
DAC2
ADC6
PWM24
ADC7
PWM25
ADC14
ADC15
35
36
371
38
39
40
41
42
43
44
45
46
47
482
493
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
PB0
PB1
PB2
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
PB10
PB11
PB12
PB13
PB14
PB15
PD8
PD9
PD10
PD11
PD12
PD13
PD14
PD15
PC6
PC7
PC8
PC9
PA8
PA9
ADC8
ADC9
PWM10
PWM11
PWM0
PWM1
PWM2
PWM3
MODE
PWM6
SPI2 SCK
PWM7
3.3 V
CAN2 RD
CAN2 TD
USBH DUSBH D+
COM3 TX
COM3 RX
COM3 CTS
COM3 RTS
PWM12
PWM13
PWM14
PWM15
PWM16
PWM17
PWM18
SD D0
PWM19
SD D1
692
70
71
72
733
74
75
76
77
78
792
80
81
82
83
84
85
86
87
88
89
90
912
924
934
941
95
96
97
98
99
100
PA10
PA11
PA12
PA13
COM1 RX
USBC DUSBC D+
GND
3.3 V
PA14
PA15
PC10
PC11
PC12
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PE0
PE1
PWM4
SD D2
SD D3
SD CLK
CAN1 RD
CAN1 TD
SD CMD
COM2 CTS
COM2 RTS
COM2 TX
COM2 RX
PWM5
PWM8
PWM9
SPI1 SCK
SPI1 MISO
SPI1 MOSI
I2C SCL
I2C SDA
PWM22
PWM23
GND
3.3 V
COM1 TX
1
Requires a 10 kΩ pull-down resistor
Requires a 10 kΩ pull-up resistor
3
Requires a 2.2 μF capacitor to GND
4
Open drain requiring a 2.2 kΩ pull-up resistor
5
Can only sink up to 3 mA, cannot source
6
Used for the analog system
2
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Reference Design
G80 SoC Datasheet
Reference Design
The G80 Dev Board is an excellent starting point and reference design for anyone interested in evaluating and
developing with the G80. See the product catalog entry for more information and additional resources.
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Device Startup
G80 SoC Datasheet
Device Startup
The G80 is held in reset when the reset pin is low. Releasing it will begin the system startup process.
There are three different components of the device firmware:
1.
2.
3.
GHI Bootloader: initializes the system, updates TinyCLR when needed, and executes TinyCLR.
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 pin. It is pulled high on
startup. When low, the device waits in the GHI Bootloader. Otherwise, the managed application is executed. LDR1
is reserved for future use.
Additionally, the communications interface between the host PC and the G80 is selected on startup through the
MODE pin, which is pulled high on startup. The USB interface is selected when MODE is high and COM1 is selected
when MODE is low.
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
G80 SoC 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 Input 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 or crystal mode, though analog output is never tolerant.
They have controllable pull up and pull down resistors.
Not all pins are interrupt capable at the same time. See design considerations.
Most pins can source or sink up to 8 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 12-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 90 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.
Rev 1.0
Channel
Timer
0 to 3
1
4 to 7
2
8 to 11
3
12 to 15
4
16 to 19
8
20 and 21
9
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7.5
Libraries
G80 SoC Datasheet
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 250 kHz ±10%. More processing time is required for higher
frequencies.
7.6
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 400 kHz ±10%. Lower frequencies have higher accuracy.
7.7
Pulse Feedback
Pulse Feedback is used for sensing capacitance on any input pin and measuring pulses from ultrasonic distance and
other sensors. When used for sensing capacitance, a 100 pF capacitor and 1 MΩ 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 2,400 to 921,600 are supported.
Handshaking is supported on COM2 and COM3 only. Data bits of 8 and 9 are supported. Stop bits of 1 and 2 are
supported. Even and odd parities are supported.
7.9
Serial Peripheral Interface (SPI)
SPI is a common three or four wire serial interface. The G80 can act as a SPI bus master only. The maximum
supported clock is 45 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.
7.10 Inter-Integrated Circuit (I2C)
I2C is a two-wire addressable serial interface. The G80 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 G80 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.
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Libraries
G80 SoC Datasheet
7.13 Graphics
The G80 supports SPI displays and drawing though the NETMF bitmap object. TrueType font files can be used once
converted to the TinyFont format used by NETMF.
7.14 Touch Screen
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.
7.16 USB Client
The USB client interface is typically used as the G80 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 G80 supports accessing files on SD cards and USB memory devices formatted as FAT16 or FAT32. SD cards use
the 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 G80 supports Ethernet and PPP through the built in LwIP stack. The full stack includes TCP, UDP, DHCP, DNS,
HTTP, FTP, and others.
7.18.1 Ethernet
Ethernet support is available using the built-in NETMF TCP/IP stack through an external ENC28J60 SPI Ethernet
chip.
7.18.2 Wi-Fi
There is no internal support for Wi-Fi. However, any Wi-Fi module with a built-in TCP/IP stack can be used.
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 G80 can use
these modems with the internal NETMF TCP/IP.
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Libraries
G80 SoC Datasheet
7.19 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.
7.20 Real Time Clock
The real time clock (RTC) is used to keep time while the processor is off, drawing its power from a backup battery
or super capacitor providing 1.65 V to 3.6 V. An appropriate 32,768 Hz crystal and its associated circuitry must be
connected to the G80 for the RTC to function.
7.21 Watchdog
Watchdog is used to reset the system if it enters an erroneous state. The G80 supports timeouts between 1 ms and
32,768 ms. Watchdog support is included through the GHI Electronics libraries replacing the built in NETMF
version.
7.22 Power Control
The G80 supports entering sleep, deep sleep, and off modes in order to reduce power usage. It can consume as
little as 40 mA in sleep, 12 mA in deep sleep, and 8 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.
7.23 Direct Memory Access
Low level device registers and memory can be accessed to further configure the G80’s underlying processor. Not
all functionality of the processor is available as some functions may be used or configured internally for use in
NETMF.
7.24 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 4 Kbytes of battery backed RAM available. Consult the
processor's documentation for details on use.
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8
Design Considerations
G80 SoC 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 G80. 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 G80 if the power supply is more than few inches away.
8.3
Crystals
The G80 requires an external 12 MHz crystal and associated circuitry to function. For the RTC to function, a 32,768
Hz crystal and circuitry are required. Please see the processor’s documentation for advanced information.
8.4
Interrupt Pins
Interrupts are only available on 16 pins at any given time. Of those 16 pins, the pin number must be unique. For
example: PA1 and PB1 cannot both be used as interrupts at the same time, but PA1 and PB2 can.
8.5
Reset
The reset pin is not pulled in any direction. Designs must be sure to use an appropriate pull-up resistor.
8.6
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
direct memory access methods.
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 G80 can fulfill the specific requirements.
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9.1
Legal Notice
G80 SoC Datasheet
Legal Notice
Licensing
The G80 SoC, with all its built-in software components, is licensed for commercial and non-commercial use. No
additional fee or licensing is required. Software, firmware, and libraries provided for the G80 SoC are licensed to be
used on the G80 SoC only.
9.2
Trademarks
G80 is a trademark 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.
9.3
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
G80 SoC Datasheet
10 Revision History
Revision
Date
Change
1.0
2015-11-12
Initial release.
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