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DS2401P+T&R 其他数据使用手册 - Maxim Integrated（美信）
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Maxim Integrated（美信）
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主动器件
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MAXIM INTEGRATED PRODUCTS DS2401P+T&R 芯片, 特殊功能
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DS2401P+T&R数据手册
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INTRODUCTION
The 1-Wire
®
communication protocol can be generated with an IO pin on a microprocessor; however,
care must be taken to provide the correct timing and proper slew rates to create a reliable 1-Wire network.
Improper timing sent by the 1-Wire master may cause communication with 1-Wire slave devices to be
intermittent or fail altogether. Uncontrolled slew rates can severely limit the length of a network and
create sporadic behavior. If a serial communication UART is available, using a serial-to-1-Wire bridge
(DS2480B) will eliminate these problems.
The DS2480B is a serial bridge to the 1-Wire network protocol. This bridge allows any host with a very
modest serial communication UART to generate properly timed and slew controlled 1-Wire waveforms.
The DS2480B receives escaped commands and data, performs 1-Wire operations, and returns the result
back to the host. See Figure 1 for a simplified diagram of the DS2480B configuration. Implementation of
this protocol and navigating the available DS2480B commands can be time consuming and confusing.
This guide identifies common 1-Wire operations and explains the construction of input serial packets and
interpretation of output serial packets for the DS2480B.
This document is designed to complement the DS2480B data sheet, but not replace it. The data sheet can
be found on http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2923.
DS2480B USAGE (SIMPLIFIED) Figure 1
The minimum host UART that will work with this bridge must support 8-bit, non-parity, 9600 baud (bits
per second) communication. Faster data rates up to 115200 baud can be negotiated but the bridge starts at
9600 baud when powering up. Electrical considerations such as RS232 are addressed in DS2480B data
sheet.
THE 1-WIRE INTERFACE
The DS2480B is only useful if all of its commands and modes can be translated into a 1-Wire
communication interface that applications can use and build upon. There are a few basic 1-Wire functions
that an application must have in order to do any 1-Wire operation. This first operation resets all of the 1-
Wire slaves on the bus readying them for a command from the 1-Wire master. The second writes a bit
from the 1-Wire master to the slaves and the third reads a bit from the 1-Wire slaves. Since the 1-Wire
master must start all 1-Wire bit communication, a ‘read’ is technically a ‘write’ of a one bit with the result
sampled. Almost all other 1-Wire operations can be constructed from these three operations. For example,
a byte written to the 1-Wire bus is just eight single bit writes. The 1-Wire Search Algorithm (See
Application Note 187 at http://www.maxim-ic.com/appnotes.cfm/an_pk/187) can also be
constructed using these primitives. This is not necessarily the most efficient implementation method,
however. The DS2480B incorporates a search accelerator mode that greatly reduces the serial
Application Note 192
Using the DS2480B Serial
1-Wire Line Driver
1-Wire master
DS2480B
(serial bridge)
1-Wire bus
RXD
HOST UART
(m or PC)
TXD
1-Wire
slave
1-Wire
slave
1-Wire is a registered trademark of Dallas Semiconductor.
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