Emulating 1 Wire DS2502 with ATTINY85 or other small microprocessor

Projects General Guidance
1

I'm looking to emulate a what I think is a 1 wire DS2502 with a small microprocessor like an ATTINY85.
I've played with the available one wire libraries for Arduino but I'm a little confused on how to go about implementing any code to emulate the DS2502 since the date transmitted isn't like any other example I've seen.
When hooking up a logic analyzer to the DS2502 I get the normal reset signal/presence, then 0xcc 'Skip ROM' command followed by 64 bytes of data. Then another reset signal/presence, 0xcc 'Skip ROM', and 9 bytes of data. Finally followed by another reset/presence, 0x4c 'unrecognized', and 25 bytes of data. The logic analyzer decoder gives a ROM error for the third set of data. Not sure why.

My Arduino ability is pretty much being able to splice together examples together for working code so I'm not sure if this something that's over my head or not.

Also, how does one differentiate what's being sent/received over the 1 wire?

Any help or advice if much appreciated.

2

Using Google this came up: (Google DS2502).

Data Sheet 1Kb Add-Only Memory Mar 31, 2015
App Note Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products
App Note Reading and Writing 1-Wire® Devices Through Serial Interfaces
App Note 1-Wire Communication Through Software
App Note 1-Wire Software Resource Guide Device Description
App Note Printed Circuit Board Identification Using 1-Wire® Products
App Note Creating Global Identifiers Using 1-Wire® Devices
App Note 1-Wire Search Algorithm
App Note Using the DS2480B Serial 1-Wire® Line Driver
Reference Schematic Advanced 1-Wire Network Driver
App Note White Paper 2: Using the 1-Wire® Public Domain Kit
App Note White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note Maxim Wafer-Level Package Assembly Guide
Tutorial Serial Digital Data Networks
App Note Assembling High-Lead (Pb) DS2502 Flip-Chips in a Pb-Free Assembly Flow
App Note Add Control, Memory, Security, and Mixed-Signal Functions with a Single Contact
App Note Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications
Tutorial Improve Sensor Performance and SNR in Pulse Oximeter Designs
App Note Injection Molding an IC into a Connector or Consumable Item
Tutorial Protecting 5V 1-Wire® Slaves from Overvoltage Exposure
Tutorial How to Build a 1-Wire® Evaluation Kit
App Note Understanding the DS1WM Synthesizable 1-Wire Bus Master

Did You read those App Notes?

3

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.