BiPOM Electronics MINI-MAX/ARM-C Technical Manual Download Page 9

 

RS232 Serial Ports 

Two  RS232  serial  ports  are  available  on  the  MINI-MAX/ARM.  IC4  converts  micro-controller’s  RXD  and  TXD 
pins to/from RS232 levels. IC4 has an internal circuit that gen/- 10 Volts for RS232 logic levels. First 
RS232 port is wired to a 10-pin header (J4). Second RS232 port is wired to a 6-pin header (J5).  

There are two options. First option is two RS232 ports, each port has TXD and RXD lines only. Second option 
is a single RS232 interface with TXD, RXD, CTS and RTS signals on J4. For this purpose, 2 jumpers must be 
set between pins 5, 6 and 1, 2 of J5.  

 

 

 

 

                                                                                Figure 4 

First serial port also serves downloading procedure to the MINI-MAX/ARM board. DSR is used by an external 
host to switch between BOOT and RUN modes.  

  

                                                 1st RS232 Serial Port (J4) 

Signal 

Pin 

Pin 

Signal 

NC (Not Connected) 

DSR_0 (BOOT) 

RXD_0 (RX0 input) 

RTS_0* (RTS0 output) 

TXD_0 (TX0 output) 

CTS_0* (CTS0 input) 

NC (Not Connected) 

NC (Not Connected) 

Ground (GND) 

10 

NC (Not Connected) 

                                                                              Table 3 

Note. RTS_0 /CTS_0 lines can be provided only installing 2 jumpers to J5. 

 

                                                 2nd RS232 Serial Port (J5) 

Signal 

Pin 

Pin 

Signal 

RXD_1 (RX input) 

CTS_0* (CTS0 input) 

Ground (GND) 

NC (Not Connected) 

TXD_1 (TX output) 

RTS_0* (RTS0 output) 

                                                                       Table 4 

 

Summary of Contents for MINI-MAX/ARM-C

Page 1: ...E Single Board Computers Technical Manual Date 27 August 2006 Document Revision 1 04 BiPOM Electronics 16301 Blue Ridge Road Missouri City Texas 77489 Telephone 1 713 283 9970 Fax 1 281 416 2806 E mai...

Page 2: ...ption replace or repair the board This warranty is voided if the product is subjected to physical abuse or operated outside stated electrical limits BiPOM Electronics will not be responsible for damag...

Page 3: ...3 TABLE OF CONTENTS 1 OVERVIEW 4 2 SPECIFICATIONS 5 3 FUNCTIONAL BLOCKS 5 4 PERIPHERALS 14 5 SOFTWARE 14 6 BOARD LAYOUT 15 7 SCHEMATICS 16...

Page 4: ...and SSP with buffering and variable data length capabilities Vectored interrupt controller with configurable priorities and vector addresses Up to 47 5 V tolerant general purpose I O pins in tiny LQFP...

Page 5: ...storage temperature range 3 Functional Blocks Figure1 Block diagram of the MINI MAX ARM system RS 232 INTERFACE LCD CONNECTOR EXPANSION CONNECTOR KEYPAD CONNECTOR ANALOG TERMINAL PROGRAMMING INTERFACE...

Page 6: ...pecifications It incorporates a number of packet filtering schemes to limit incoming packets It also provides an internal DMA module for fast data throughput and hardware assisted IP checksum calculat...

Page 7: ...r contains 5 Volt power and ground lines and the 8 port lines of the micro controller The lines can also be used as general purpose inputs outputs Keypad Connector J1 Signal Pin P1 16 KEY0 1 P1 17 KEY...

Page 8: ...LCD display under software control Alternatively it can be used as a general purpose analog output Contrast PB4 PD0 PD1 PD2 and PD5 lines are driven by the 2nd AVR microcontroller by I2C interface LC...

Page 9: ...For this purpose 2 jumpers must be set between pins 5 6 and 1 2 of J5 Figure 4 First serial port also serves downloading procedure to the MINI MAX ARM board DSR is used by an external host to switch b...

Page 10: ...10 Figure 5...

Page 11: ...n MINI MAX ARM using standoffs or can be placed up away from MINI MAX ARM using a 20 wire ribbon cable Peripherals section lists the available expansion boards Table 5 shows the pin assignments for th...

Page 12: ...ouples etc Five ADC inputs analog reference VREF analog power supply VAN and analog ground are wired to J8 Analog terminals J8 Signal Pin P0 27 AN0 1 P0 28 AN1 2 Analog Ground AGND 3 P0 29 AN2 4 Analo...

Page 13: ...ly Unit MINI MAX ARM board comes with a 6VDC unregulated DC power supply Other power supplies can also be used although this invalidates the warranty External power supply should be able to supply 6 t...

Page 14: ...to a micro computer board in a stacked fashion Figure 9 shows the chain connection Figure 8 Figure 9 More details concernig BiPOM Peripheral boards are available from the link below http www bipom com...

Page 15: ...Connector UART1 Connector 3V Reference 5V Regulator ARM LPC2138 3 3V Analog Regulator 3 3V Digital Regulator FLASH Memory JTAG Connector RS232 Port KEYPAD Connector LCD Connector UART0 Connector Batte...

Page 16: ...16 7 Schematics...

Page 17: ...17...

Page 18: ...18 Note The parts shown on sheet 3 3 related to Ethernet feature are not present in MINI MAX ARM C...

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