X100 RPI Expansion Board V1.2

The X100 expansion board designed for use on the Raspberry Pi (RPi) computer platform. The board supplies RPi with a regulated +5V from a wide-range voltage source and also contains a real-time clock, a RS232 master port, a HDMI to VGA converter, 3-port USB hub, memory card reader, and 8-channel darlington Driver.  

Main Features

• Exactly same size as Raspberry Pi (85 x 56mm)
• Directly installed into the GPIO header pins with no wiring or soldering
•  6-23V input to 5V, 3A high-efficiency step-down DC/DC converter to supply your RPI
• Supports HDMI to VGA (NOT powered by the RPI’s HDMI port)
• Supports self-powered USB hub (Total 4 ports available)
• Supports self-powered SD and Micro-SD card reader
• RTC based on NXP PCF2127AT / PCF2129AT with CR2032 backup battery
• RS232 Serial Port
• Having the reset switch convenient to enable RPi reset facility
• Having two slots to make use of RPi’s FPC connector (S1 & S5)
• Allowing to stack along with other expansion boards.
• 8-channel darlington Driver chip allowing to control electronic circuits which require more current to drive them
• Have DIP switch to remove connection from RPi’s pin header so as to keep using other expansion board with no effect.

Power Supply

X100 supplies the RPi with a regulated +5V through the GPIO header using a 5A poly-resettable (PTC) fuse. With the wide voltage input range, the RPi can be powered from a wide variety of external sources such as batteries, 12V power adapters, solar battery sources, etc. Additional +5V power outputs are also available at the pins of the JST servo ports connectors.  

Warning: do not connect a +5V supply through the Raspberry Pi micro-USB connector when used with X100.

HDMI-2-VGA

See description on http://elinux.org/RPi_Screens#RGB_analog.2FVGA
Any HDMI to VGA adapter without external PSU might work for a time, but then burn out D1, therefore Do not use HDMI converters powered by the HDMI port! The solution is to either only use externally powered converters.

X100 doesn’t use power from RPi HDMI port and has many features that enable it to perform in a superior manner. Among those features you will find: 

• Easy to Use: No need of cable and setting
• Conversion: It can convert complete HDMI into VGA video.
• Supports 165MHz/1.65Gbps per channel (6.75Gbps all channel) bandwidth for HDMI Input.
• Supports Analogue Video output up to UXGA and 1080p with 10-bit DAC.

RS232 Master Port

The RS232 port is connected to the UART port on the Raspberry Pi using a MAX3232 interface. The MAX3232 IC converts the 3.3V UART port to RS232 voltages allowing communication with RS232 compatible devices over a DB9 serial cable or with the use of a null-modem cable the board allows terminal access with linux on the Raspberry Pi using a terminal application. The RS232 port can be accessed through the DB9 port.

RTC (Real Time Clock)

Designed to be used in Raspbian and It is a highly accurate real-time clock which connects via the GPIO port on a Raspberry Pi. It uses the GND, SDA and SCL pins.

It utilises the highly accurate NXP PCF2127AT / PCF2129AT chip and features:

• Very accurate timekeeping (typically ±3ppm or <2 minutes deviation per year).
• Integrated crystal that compensates for temperature and age.
• The supplied battery will keep the time for a very long time if the device isn't used and considerably longer if it is.
• 512 bytes of static RAM protected by the backup battery.
• Coin Battery Included!

ULN2803 8-Channel RC Servo Port

Bring in some muscle to your output pins with 8 mighty Darlingtons! This driver chip contains 8 drivers that can sink 500mA from a selecable 5V or input voltage supply and has kickback diodes included inside for driving coils. This will let your little microcontroller or microcomputer power solenoids, DC motors (in one direction) and unipolar stepper motors. The GPIO Pins are connected to ULN2803 inputs through a DIP switch, with the its outputs going to two array of Wire-to-Board header. Alternatively, these ports can be used to supply +5V or input voltage to other external circuitry, or embedded devices.

Please note that this is an 'open collector' driver - it can only be used to connect the load to ground and there will be a 1 Volt (or more) 'drop' across the internal transistors.

USB-Hub and Card Reader

• Fully tested for compatibility with the Raspberry Pi
• Fully compliant with USB Hub Specification version 2.0 and is also backward compatible with USB Hub specification 1.1
• Supports three self-powered downstream ports
• Extra low power consumption
• USB Device Class Definition for Mass Storage, Bulk-Transport V1.0
• Support SD spec up to ver. 2.0 (SDHC)
• Hardware DMA engine integrated for performance enhancement

Note: SD card and Micro-SD card cannot be read /write at the same time.

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