G80 SoC Datasheet by GHI Electronics, LLC

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G80 SoC Datasheet

GHI Electronics, LLC  Introduction  G80 SoC Datasheet 
Rev 1.0 

www.ghielectronics.com 
 
Contents 
Introduction .......................................................................................................................................................... 3 
1 Key Features ................................................................................................................................................. 3 
2 Example Applications ................................................................................................................................... 3 
The .NET Micro Framework .................................................................................................................................. 4 
1 GHI Electronics and NETMF .......................................................................................................................... 4 
Pinout Table .......................................................................................................................................................... 5 
Reference Design .................................................................................................................................................. 6 
Device Startup ....................................................................................................................................................... 7 
Libraries ................................................................................................................................................................ 8 
1 General Purpose Input and Output (GPIO) .................................................................................................. 8 
2 Analog Input ................................................................................................................................................. 8 
3 Analog Output .............................................................................................................................................. 8 
4 Pulse Width Modulation (PWM) .................................................................................................................. 8 
5 Signal Generator .......................................................................................................................................... 9 
6 Signal Capture .............................................................................................................................................. 9 
7 Pulse Feedback ............................................................................................................................................. 9 
8 Universal Asynchronous Receiver Transmitter (UART) ................................................................................ 9 
9 Serial Peripheral Interface (SPI) ................................................................................................................... 9 
10 Inter-Integrated Circuit (I2C) ........................................................................................................................ 9 
11 Controller Area Network (CAN) .................................................................................................................... 9 
12 1-Wire .......................................................................................................................................................... 9 
13 Graphics ..................................................................................................................................................... 10 
14 Touch Screen .............................................................................................................................................. 10 
15 USB Host ..................................................................................................................................................... 10 
16 USB Client ................................................................................................................................................... 10 
17 File System ................................................................................................................................................. 10 
18 Networking ................................................................................................................................................. 10 
18.1 Ethernet ............................................................................................................................................. 10 
18.2 Wi-Fi .................................................................................................................................................. 10 
18.3 Point to Point ..................................................................................................................................... 10 
19 Configuration ............................................................................................................................................. 11 
20 Real Time Clock .......................................................................................................................................... 11 
21 Watchdog ................................................................................................................................................... 11 
22 Power Control ............................................................................................................................................ 11 
23 Direct Memory Access ............................................................................................................................... 11 
24 Battery RAM ............................................................................................................................................... 11 
Design Considerations ........................................................................................................................................ 12 
1 Required Pins ............................................................................................................................................. 12 
2 Power Supply ............................................................................................................................................. 12 
3 Crystals ....................................................................................................................................................... 12 
4 Interrupt Pins ............................................................................................................................................. 12 
5 Reset .......................................................................................................................................................... 12 
6 Direct Memory Access ............................................................................................................................... 12 
Legal Notice ........................................................................................................................................................ 13 
1 Licensing ..................................................................................................................................................... 13 
2 Trademarks ................................................................................................................................................ 13 
3 Disclaimer ................................................................................................................................................... 13 
Revision History .................................................................................................................................................. 14 
 

netmf

GHI Electronics, LLC Introduction G80 SoC Datasheet

Rev 1.0

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2 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

 .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

2.2 Example Applications

 Vending machines

 POS Terminals

 Measurement tools and testers

 Networked sensors

 Robotics

 Central alarm system

 Smart appliances

 Industrial automation devices

GHI Electronics, LLC The .NET Micro Framework G80 SoC Datasheet

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3 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.

GHI Electronics, LLC Pinout Table G80 SoC Datasheet

Rev 1.0

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4 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.

PE2

PB0

ADC8

PWM10

692

PA10

COM1 RX

PE3

LDR0

PB1

ADC9

PWM11

PA11

USBC D-

PE4

LDR1

371

PB2

PA12

USBC D+

PE5

PE7

PA13

PE6

PE8

733

VBAT

PE9

PWM0

GND

PC13

PE10

3.3 V

PC14

RTC XTAL IN

PE11

PWM1

PA14

PC15

RTC XTAL OUT

PE12

PA15

PWM4

GND

PE13

PWM2

PC10

SD D2

3.3 V

PE14

PWM3

792

PC11

SD D3

SYS XTAL IN

PE15

MODE

PC12

SD CLK

SYS XTAL OUT

PB10

PWM6

SPI2 SCK

PD0

CAN1 RD

RESET

482

PB11

PWM7

PD1

CAN1 TD

PC0

ADC10

493

PD2

SD CMD

PC1

ADC11

3.3 V

PD3

COM2 CTS

PC2

ADC12

SPI2 MISO

PB12

CAN2 RD

PD4

COM2 RTS

PC3

ADC13

SPI2 MOSI

PB13

CAN2 TD

PD5

COM2 TX

3.3 V

PB14

USBH D-

PD6

COM2 RX

206

GND

PB15

USBH D+

PD7

3.3 V

PD8

COM3 TX

PB3

PWM5

SPI1 SCK

226

3.3 V

PD9

COM3 RX

PB4

PWM8

SPI1 MISO

PA0

ADC0

COM4 TX

PD10

912

PB5

PWM9

SPI1 MOSI

PA1

ADC1

COM4 RX

PD11

COM3 CTS

924

PB6

I2C SCL

PA2

ADC2

PWM20

PD12

COM3 RTS

PWM12

934

PB7

I2C SDA

PA3

ADC3

PWM21

PD13

PWM13

941

GND

PD14

PWM14

PB8

PWM22

3.3 V

PD15

PWM15

PB9

PWM23

PA4

ADC4

DAC1

PC6

PWM16

PE0

PA5

ADC5

DAC2

PC7

PWM17

PE1

PA6

ADC6

PWM24

PC8

PWM18

SD D0

GND

PA7

ADC7

PWM25

PC9

PWM19

SD D1

100

3.3 V

PC4

ADC14

PA8

PC5

ADC15

PA9

COM1 TX

1Requires a 10 kΩ pull-down resistor

2Requires a 10 kΩ pull-up resistor

3Requires a 2.2 μF capacitor to GND

4Open drain requiring a 2.2 kΩ pull-up resistor

5Can only sink up to 3 mA, cannot source

6Used for the analog system

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GHI Electronics, LLC Reference Design G80 SoC Datasheet

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5 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.

GHI Electronics, LLC Device Startup G80 SoC Datasheet

Rev 1.0

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6 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. GHI Bootloader: initializes the system, updates TinyCLR when needed, and executes TinyCLR.

2. TinyCLR: loads, debugs, and executes the managed application.

3. 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.

www. hielectromc com su on netmf

GHI Electronics, LLC Libraries G80 SoC Datasheet

Rev 1.0

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7 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:

 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).

7.2 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.

Channel

Timer

0 to 3

4 to 7

8 to 11

12 to 15

16 to 19

20 and 21

GHI Electronics, LLC Libraries G80 SoC Datasheet

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7.5 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.

GHI Electronics, LLC Libraries G80 SoC Datasheet

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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.

GHI Electronics, LLC Libraries G80 SoC Datasheet

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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.

GHI Electronics, LLC Design Considerations G80 SoC Datasheet

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8 Design Considerations

8.1 Required Pins

Exposing the following pins is required in every design to enable device programming, updates, and recovery:

 LDR0

 LDR1

 Desired debug interface(s)

 MODE if required to select a debug interface

8.2 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.

GHI Electronics, LLC Legal Notice G80 SoC Datasheet

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9 Legal Notice

9.1 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.

GHI Electronics, LLC Revision History G80 SoC Datasheet

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10 Revision History

Revision

Date

Change

1.0

2015-11-12

Initial release.

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