SPMA057E January   2018  – January 2025 TM4C1290NCPDT , TM4C1290NCZAD , TM4C1292NCPDT , TM4C1292NCZAD , TM4C1294KCPDT , TM4C1294NCPDT , TM4C1294NCZAD , TM4C1297NCZAD , TM4C1299KCZAD , TM4C1299NCZAD , TM4C129CNCPDT , TM4C129CNCZAD , TM4C129DNCPDT , TM4C129DNCZAD , TM4C129EKCPDT , TM4C129ENCPDT , TM4C129ENCZAD , TM4C129LNCZAD , TM4C129XKCZAD , TM4C129XNCZAD , TMP1826 , TMP1827

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction to 1-Wire®
    1. 1.1 Bus Requirements
    2. 1.2 Powering
  5. 2Functional Description
    1. 2.1 Signaling on 1-Wire®
    2. 2.2 Address Format of the 1-Wire® Device
    3. 2.3 Typical Communication Flow on the 1-Wire® Bus
  6. 3Functions Available in TivaWare for C Series for 1-Wire® Module
  7. 4Enumeration
    1. 4.1 Legacy Search Algorithm
      1. 4.1.1 Steps of the 3-Bit Search Algorithm
    2. 4.2 Fast Search Algorithm
  8. 5Summary
  9. 6References
  10. 7Revision History

Abstract

1-Wire® bus is used in systems that have low power communication and reduced pin count requirements. This application report describes the 1-Wire® communication protocol, available TivaWare™ for C Series APIs for the 1-Wire® controller in Tiva™ C Series (TM4C129x) microcontrollers and an example enumeration algorithm using binary tree search. The device used in this example code to enumerate 1-Wire® devices is the TMP1826 ±0.3°C accurate digital temperature sensor with 2-Kbit EEPROM.

The source code discussed in this application report can be downloaded here. Additionally, Implementing Host Controller for TMP1826 Single Wire Temperature Sensor provides emulated host examples for Tiva C Series microcontrollers that do not have a dedicated 1-Wire® controller by using GPIO, UART or SPI peripherals.