MicroConverter® Technical Note uC006 4-wire UART-to-PC Interface

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MicroConverter® Technical Note uC006 4-wire UART-to-PC Interface

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INTRODUCTION:
MicroConverter® Technical Note uC006 4-wire UART-to-PC Interface
Connecting your MicroConverter chip downloading debugging code requires RS-232 line driver/receiver chip step UART's CMOS logic levels RS-232 levels. don't already have RS-232 chip your MicroConverter design, this "4-wire UART" dongle greatly simplify PC-to-MicroConverter connection allowing no-hassle in-system download/debug access without adding components your board. IMPLEMENTATION: circuit Figure nothing more than standard RS-232 line driver/receiver block. many applications (and MicroConverter evaluation boards) this circuit, very much like included same board MicroConverter itself. shown Figure however, RS-232 transceiver circuit sits tiny Figure Connecting Download Debug board connected 9-pin D-SUB (J1) PC's serial port. 4-conductor ribbon cable other this small board connected directly pins MicroConverter, allowing simple pin-header MicroConverter board provide full download/debug access chip. addition carrying MicroConverter's (UART receive transmit) signals, ribbon cable carries MicroConverter's line power RS-232 chip, thus avoiding need additional power source. WHAT ABOUT RS-485? we've described simple solution downloading debugging MicroConverter code designs without resident networking hardware kind. what about designs that feature resident networking hardware other than RS-232 (such RS-485)? Simply adding RS-232 connection could cause contention these cases. solution this dilemma illustrated Figure Basically, just extra pins
0.1uF
0.1uF
C1C2+ C2VT2OUT R2IN
T1OUT R1IN R1OUT T1IN T2IN R2OUT
0.1uF
chip
0.1uF
0.1uF
ADM202
4-conductor ribbon cable
9-pin D-SUB
Figure Schematic "UART Dongle" Sept 2000
MicroConverter® Technical Note uC006 4-wire UART-to-PC Interface
RS-232 dongle header, these pins automatically disable RS-485 chip whenever RS-232 dongle inserted. During normal operation, dongle left open RS-485 communication goes unimpeded. inserting RS-232 dongle, pulled ground respectively, thereby automatically disabling RS-485 transceiver allow RS-232 communications. BOARDS: Simple board layouts RS-232 dongle PC-board given below.
RS-232 dongle
ADuC8xx
(port
RS-485 network
ADM1485
Figure RS-232 Download Option RS-485 Enabled System
Figure Silk Screen Sept 2000
Figure Solder Side
Figure Component Side

MicroConverter® Technical Note uC006 4-wire UART-to-PC Interface

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