Embedded PIC based SBC board with RS232 interface and sockets for RTC, EEPROM, I/O Expander, RS485 a

SBC44B

~~US$39.95~~ US$24.95

Click to enlarge

Single board computer for 44 pin PIC with RS232 interface and sockets for RTC, EEPROM, I/O Expander, RS485 and CAN BUS. Fully assembled. CPU not included. Quantity discounts up to 30% available, for details click here.

Product Datasheet in PDF format (26 April 2005)

(Click here for archived documentation)

Introduction	Features
Expansion	Details
Application Notes and Source Code	Buy Online

Introduction

The SBC44B is an embedded Single Board Computer (SBC) for the PIC16 and PIC18 family of microcontrollers. It has a RS232 interface assembled, and sockets for the following I2C chips:

RTC, for example the DS1307
EEPROM, for example the 24LC256 or 24LC512 (64 kbytes).
RS485 interface driver, for example the MAX485, SP485...
CAN BUS driver, for example the MCP2551.
MCP23008 8 Bit I/O Port Expander.

A high accuracy, 20ppm, 32.768 kHZ crystal for the RTC is already assembled. All that is needed for the RTC to work is for a RTC chip to be plugged in. The board is also shipped with a 5 pin 3.81mm terminal block plug that plugs into the boards terminal block header - as shown in the above photo.

The RS232 interface uses the 9 pin Sub-D connector (DTE). The 5 pin phoenix connector can be configured for RS485 or CAN BUS. When configured as a RS485 interface, the PIC chip's internal USART will be used for the RS485 interface, and the RS232 interface has to be driven by software. When configured as a CAN BUS a PIC chip with an internal CAN peripheral has to be used, like the PIC18F458 for example.

It has been optimized for any 44 pin PLCC PIC chip with an USART and I2C hardware peripheral, like the:

PIC16C65, PIC16C67
PIC16F74, PIC16F747, PIC16F77, PIC16F777, PIC16F877(A)
PIC18F452, PIC18F458, .....
Many more 44 pin PLCC PIC chips with USART and I2C peripherals.

This is only because the above mentioned chips have internal USARTs and I2C peripherals, which are connected to the serial drivers and I2C chips on this board. It can however also be used with most other 44 pin PLCC PIC chips, as long as their power, reset(MCLR) and oscillator pins are situated in the same place as the chips listed above. The only difference is that if it hasn't got a hardware USART or I2C peripheral, it will have to be done with software on the PIC chip.

Features

33 I/O ports when using common PIC chips, for example the PIC16F877A or PIC18F452.
8 Analog inputs when using PIC chips with ADC units, for example the PIC16F877A or PIC18F452.
8 Additional I/Os when assembling MCP23008 I/O expander. This gives a total of 39 I/O ports.
Is part of our MicroX product range, and has a Daughter board connector and a Compact Daughter board connector for expansion. For details see www.modtronix.com/microx.
Compact size of 97mm x 54mm. For details see www.modtronix.com/microx/dimensions.
Assembled with High Quality, Industrial Temperature components - electrolytic capacitors used are extra long lifetime rated!
Diode protected 2.1mm power connector for a standard DC transformer.
Wide operating voltage range from 7 – 30V.
On board 15kV ESD protected RS232 interface. Assembled with industrial temperature range interface driver chip.
Sub-d 9 pin male connector (DTE configuration) with ground and RS232 Tx and Rx signals.
5 pin 3.81mm terminal block connector with RS485 or CAN BUS signals (when interface drivers are assembled), ground and external power.
The power pin on the 5 pin terminal block connector can be connected to the boards unregulated power supply (the input of the 2.1mm power connector) via a strap. This can be used to:
- Provide power for all other boards daisy chained to this one. For this to work this board must be powered via its 2.1mm power connector! It will supply power to all other boards daisy chained to it.
- Obtain power for this board. In this case no power has to be supplied via the 2.1mm power connector. It will obtain it's power via the 5 pin terminal block connector.
Power LED to indicate when device is powered.
LED connected to B6 via high impedance resistor (2k2). Can be used by user application, and does not interfere with in circuit serial programming.
Two pin connector (2 pin 2.54mm) for external battery for the RTC.
Socket for a I2C Serial EEPROM to be fitted. For example the 24LC256 (32 kbytes), 24LC512 (64 kbytes).....
Socket for a RS485 (SP485, MAX485...) or CAN BUS (MCP2551) interface driver chip to be fitted.
Socket for an I2C bus RTC (DS1307 for example) chip to be fitted, the 32kHZ clock crystal is already assembled.
Micro Match socket with Power, I2C and SPI signals. The Micro Match connector can be used to daisy chain multiple I2C devices together.
Has an ICSP (In Circuit Serial Programming) connector (ICPC1 type) - CPU can be programmed in circuit. For details see Programming Modtronix PIC based boards.

Expansion

The SBC44B's Daughter Board Connectors can be used as expansion ports to add additional functionality. They contains all free CPU port pins, MCP23008 I/O expander pins, power, I2C, SPI, RS232 signal,..... For further details on the Daughter Board Connectors, see www.modtronix.com/microx/expansion.
The following Daughter Boards for the SBC44B are currently available from Modtronix Engineering:

DEV16T - LCD Daughter Board
DEV7TC - Seven Segment Display Daughter Board
PT01T-ASM - Daughter Prototype Board
PT01TC-ASM - Compact Daughter Prototype Board

The following I2C devices can currently be connected to this board via it's Micro Match connector:
•	Serial 16x2 LCD Character Displays - Serial LCD displays with keypad encoder and user I/Os
•	Serial 20x4 LCD Character Displays - Serial LCD displays with keypad encoder and user I/Os

Click to enlarge

Additionally, users can download PCB templates for creating their own Daughter boards from our Downloads page.

Details, Schematics and Partlist

Product Datasheet in PDF format (26 April 2005)

(Click here for archived documentation)

Application Notes and Source Code

	Web	PDF	Data
Demo C Code for SBC44B board with 20MHz crystal
Demo C Code for SBC44B board with 10MHz crystal
CAN Application notes From Microchip.
Programming Modtronix PIC based boards

Additional source code and user contributions for this board is located on our file download page. If anyone has any code they would like to contribute, please upload it onto our file download page for other users!
There is also a forum for the Modtronix site.

Buy Online

Select desired options, and then click on Add to Cart icon below!

Available Options:
Crystal Assembled:
Line Drivers:
Memory:
PIC CPU included:
Printed Documentation:
RTC:

This product was added to our catalog on Friday 18 June, 2004.

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