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8bit bus monitor
By: dilshan
This is an AT89S2051 base 8bit bus monitoring utility. This module indicate bus values and notify value changes by a beep. This utility is design to work with any 5V compatible TTL/CMOS - data/address buses.
This device is useful for digital electronic designs and troubleshootings.
Download project description w/o images
Download project description w/ images
Files
- portmon_schematic.zip - Schematic in SCH (EAGLE) and PDF formats
- portmon_source.zip - AT89S2051 source code and compiled HEX file
Bill of Materials
Qty | Part # | Description | Schematic ID | Source | |
---|---|---|---|---|---|
1 | AT89S2051-24PU | IC, 8BIT MCU FLASH, 89S2051, DIP20 | IC1 | Source | |
1 | M74HC595B1R | 8 Bit Shift Register Output Latch (3-State) | IC2 | Source | |
1 | FOXLF036S | CRYSTAL, 3.579545MHz, 18PF, THRU HOLE | Q1 | Source | |
3 | 2SC945 | 2SC945 | T1, T2, T3 | Source | |
2 | HDSP-F101 | Low Current Seven Segment displays | SSD1, SSD2 | Source | |
1 | MCP320Q | Audible Signal | SG1 | Source | |
1 | CSC09A0110K0GPA | RESISTOR, BUS RES N/W, 8, 10KOHM, 2%, SIP | RN1 | Source | |
3 | PCF14JT22K0 | PCF Series Ø 2.3 x 6.5 mm 0.25 W 22 kOhm ±5 % Through Hole Carbon Film Resistor | R1, R2, R3 | Source | |
3 | PCF14JT10K0 | RES 10K OHM 1/4W 5% CARBON FILM | R11, R12, R13 | Source | |
7 | PCF14JT330R | RES 330 OHM 1/4W 5% CARBON FILM | R4, R5, R6, R7, R8, R9, R10 | Source | |
2 | K150J15C0GF5TL2 | Ceramic Multilayer Capacitor | C1, C2 | Source | |
1 | K104K15X7RF5TL2 | Ceramic Multilayer Capacitor | C3 | Source | |
1 | 640456-2 | HEADER, VERTICAL, 0.1", 2WAY | TP1, TP2 | Source | |
1 | LPPB501NFFN-RC | 50 Position Total Single Row 1.27 mm Pitch Straight Female Header | SV1 | Source | |
1 | 1101M2S3CQE2 | SLIDE SWITCH, SPDT, ON-ON | S1 | Source | |
1 | 110-99-320-41-001000 | DIP Socket | IC1 | Source | |
1 | 110-99-316-41-001000 | DIP Socket | IC2 | Source |
Download BOM w/o images
Download BOM w/ images
Steps
1. Assembling the circuit
- To assemble the circuit use the given schematic. It is highly recommended to use appropriate IC sockets for IC1 and IC2.
- For Q1 (Crystal) use any 3MHz crystal. We test this system with 3.575611MHz and 3.579545MHz crystals.
2. Attach seven segment display (SSD) to IC2
Connections between IC2 and SSD are as follows:
- IC Pin 1 - Segment G
- IC Pin 2 - Segment F
- IC Pin 3 - Segment E
- IC Pin 4 - Segment D
- IC Pin 5 - Segment C
- IC Pin 6 - Segment B
- IC Pin 7 - Segment A
3. Power Supply
This 8bit bus monitor requires 5V external power supply. In the idle mode this unit draws 15mA of current and in working mode (when inputs get change) this may raise up to 20mA – 30mA. Due to this low power profile, this system can also attach into the PSU of the "testing system".
Download steps w/o images
Download steps w/ images
Revisions
1 - Initial project release
Add revision
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