12-MHz
functionnal clock
Device
MPU
subsystem
Interrupt
controller
HDQ_IRQ
HDQ/1-Wire
controller
HDQ_FCLK
HDQ_ICLK
PRCM
L4
interconnect
Interface clock
hdq1wr-001
hdq_sio
Public Version
HDQ/1-Wire Overview
www.ti.com
18.1 HDQ/1-Wire Overview
The HDQ/1-Wire module implements the hardware protocol of the master functions of the Benchmarq
HDQ and the Dallas Semiconductor 1-Wire® protocols. These protocols use a single wire for
communication between the master (HDQ/1-Wire controller) and the slaves (HDQ/1-Wire external
compliant devices).
shows the HDQ/1-Wire controller module.
Figure 18-1. HDQ/1-Wire Highlight
The HDQ and 1-Wire module has a generic L4 interface and is intended to be used in an interrupt-driven
fashion. The one-pin interface is implemented as an open-drain output at the device level.
The HDQ operates from a fixed 12-MHz functional clock provided by the PRCM module.
Only the MPU subsystem uses the HDQ/1-Wire module.
The main features of the HDQ/1-Wire module support the following:
•
Benchmarq HDQ protocol
•
Dallas Semiconductor 1-Wire protocol
•
Power-down mode
The HDQ/1-Wire module provides a communication rate of 5K bits/s over an address space of 128 bytes.
A typical application of the HDQ/1-Wire module is the communication with battery monitor (gas gauge)
integrated circuits.
2842
HDQ/1-Wire
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
Страница 174: ...174 List of Tables SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...