The SBC83IL-1W28 is a Single Board Computer (SBC) assembled with the
PIC18F87J11 Microcontroller from Microchip, running at 48MHz. It has one RS-232 port, one RS-485 port,
one 1-Wire port, two daughter board connectors, and two 14 pin IDC connectors. In addition it has one
for adding serial peripherals (like SRAM, FLASH, EEPROM...).
The RS-232 port has four signals, Transmit, Received, CTS and RTS. For many applications only the Transmit
and Receive are needed. CTS and RTS are also available for devices that require hardware handshaking.
The RS-485 port can be used as a master or slave port, and have DIP switches for enabling termination
and bias resistors. On a RS-485 network, one node will normally have bias resistors enabled, and the two end
nodes will have terminating resistors. The DIP switch can also be used to place the supply voltage on the
RS-485 connector, which can be used to power other nodes on RS-485 bus, or get power from the bus.
The 1-Wire port uses a Dallas DS2482-100 I2C to 1-Wire bridge, and has an active pull-up transistor
to extend the length of the 1-Wire network.
Modtronix provides many free example projects written in C. They are written for the free Microchip
and MPLAB C18 C Compiler.
The Microcontroller has 128KBytes internal FLASH and 3936 Bytes of internal SRAM. Additionally this
boards has a 64KBit external EEPROM. It also has space for a 32MBit (4MByte) external FLASH, a 32KByte
external SRAM, and a RTC with a Super Capacitor as battery. Note that the external FLASH, SRAM and RTC chips
are not assembled!
There are plenty of Digital Inputs, Digital Outputs, Analog Inputs, PWMs and more available
via two daughter board connectors and two 14 pin IDC connectors. Prototype daughter boards that make the signals
on the daughter board connector available on prototyping space are available
The SBC83IL-1W28 accepts a wide supply voltage from 4V to 20V. It has a dual 3.3V and 5.0V
power supply, making it easy to interface with both 3.3V and 5.0V devices. By default, the 5V supply is not
used. If required (on daughter board for example), the supply voltage has to be from 7V to 20V.
All chips on the board are 3.3V, but the microcontroller's I/O pins are 5.0V tolerant, allowing it to interface
with 5.0V devices. Very high quality, brand name capacitors and regulators are used for the power supply, guaranteeing
many years of trouble free operation.
This board is assembled with very high quality, brand name components! Our goal is for
this board to work error free for many years. For this reason, we do not use cheap components,
or stress components to the limit of their capability! The quality of assembly, and reliability
of components used sets this board apart from similar competitor products!
For details on the PIC18F87J11, download it's datasheet from