1-Wire Mini Host. User Manual

Transcription

1 March 015

2 Table of Contents 1 Features Technical Specifications Installation 1-Wire Host System Extension Standalone Board Overview 1-Wire Connector (K1-K8) Connector for IC Master (K9) Software 1-Wire Automation Software owfs ESD/Lightning Protection 9 7 Legal Information Disclaimer Trademarks Contact Information 10 Revision History Date Authors Peter S'heeren Description Initial release.

3 1 Features 1-Wire adapter with 8-channel 1-Wire controller. 1-Wire adapter can operate at. V and 5 V. -pin header is included. IC bus interface, up to 00 khz. Can be used as standalone board. Can be installed as extension board for 1-Wire Host System. Supported by 1-Wire Automation Software. Supported by the owfs software package. Technical Specifications Dimensions 0 mm x 8 mm x 15 mm (W x D x H) Weight 7. g (without -pin header)

4 Installation 1-Wire Host System Extension The fits as an extension on the 1-Wire Host System. It adds another eight 1-Wire channels to the four channels that are already present on the 1-Wire Host System. Follow these steps to install the extension board: 1. Solder the -pin header as shown in the left picture.. Plug the in connector K7 of the 1-Wire Host System. Drive screws through the mounting holes to secure the board. Connector K7 is located in the extension area as indicated in the right picture. As an extension board, the operates at 5 V. It resides on the same IC bus as the on-board 1-Wire controllers and I/O expander chip. Standalone You can use the as a standalone board in your project. In this capacity, you can solder the -pin header as you wish, thus facing upwards or downwards, or you can opt to solder another means of connection.

5 Board Overview Label Description K1 DS Wire controller channel 1 K DS Wire controller channel K DS Wire controller channel K DS Wire controller channel K5 DS Wire controller channel 5 K6 DS Wire controller channel 6 K7 DS Wire controller channel 7 K8 DS Wire controller channel 8 K9 Connector for IC master 5

6 1-Wire Connector (K1-K8) Mark Description 1 1 Vcc output DQ This connector exposes a 1-Wire channel. Connector for IC Master (K9) Mark Description 1 Vcc input IC serial data (SDA) IC serial clock (SCL) 1 Connection to the DS Wire controller. The controller can operate at. V and 5 V. The slave address is b. The chip supports a maximum bus speed of 00 khz. 6

7 5 Software 1-Wire Automation Software The can be used with the 1-Wire Automation Software. Client command Adapter Add can be used in various ways. adapter "ow" add icdev "/dev/ic-" ds8 1Ch The adapter is connected to the IC bus with device path /dev/ic-. adapter "ow" add serial "\\.\COM5" axicat twi ds8 1Ch The adapter is connected to the IC bus of an AxiCat plugged into a Windows PC. The image above shows the 1-Wire Automation Server GUI displaying the 1-Wire Mini Host with a MAX1850 thermocouple chip connected to the fourth channel. In the free version of the server, enumeration is limited to the first channel of the first controller. The connector of this channel is labeled K1 on the. The orange marker in the image to the left shows the physical location of the channel's connector. 7

8 owfs The can be used with owfs, the 1-Wire File System. This software package is available from the following website: The owfs software includes programs that expose the 1-Wire hardware in a variety of ways to the system: owfs: Creates a file system in a specified mount directory. This program requires software package libfuse. owhttpd: Sets up a web server. owftpd: Sets up an FTP server. owserver: A server that allows multiple client programs to access the 1-Wire hardware. These programs support a uniform command line syntax for specifying which 1-Wire adapters to detect and to expose. For the, the --ic command line option is of importance. Suppose you want to set up a web server that listens to port 80. Suppose the 1-Wire Mini Host is connected to /dev/ic-. Enter the following command as root in the bin directory of owfs: #./owhttpd -p 80 --ic=/dev/ic-: The /dev/ic-<n>:<i> syntax denotes offset <n> from IC address b on IC bus of <i>. The mentioned command line syntax thus tells owhttpd to look for a 1-Wire controller at address b. The type of 1-Wire controller doesn't need to be specified; the owfs software can distinguish between a DS8-800 chip and a DS8100 chip. Refer to the owfs documentation for more information. 8

9 6 ESD/Lightning Protection When you're planning to expose your 1-Wire network to the open air or an hostile environment, ESD and nearby lightning strikes may hit your 1-Wire network and destroy the and 1-Wire slaves in the process. We strongly advice to protect your if such problems are real. Here's an example circuit to protect a 1-Wire adapter. Note that for the correct functioning of the circuit, a reliable earth connection is required (computer chassis, mains earth connector, grounding pin, ). R 1-Wire Network 1N50 DQ 1N50 DQ R 1.5KE10ACCT 10V 1500W 1N50 1-Wire Adapter PE You can opt to protect 1-Wire slaves as well. Here's an example circuit to protect a 1Wire slave from certain destructive discharges on the 1-Wire network: 7R 1-Wire Network DQ 1N00 DQ 1N00 1V 1W 1-Wire Slave The diagrams presented here are example circuits. It's the end-user's responsibility to provide the required protection measures to prevent the from being destroyed by electrical discharges and similar phenomenons. 9

10 7 Legal Information Disclaimer Axiris products are not designed, authorized or warranted to be suitable for use in space, nautical, space, military, medical, life-critical or safety-critical devices or equipment. Axiris products are not designed, authorized or warranted to be suitable for use in applications where failure or malfunction of an Axiris product can result in personal injury, death, property damage or environmental damage. Axiris accepts no liability for inclusion or use of Axiris products in such applications and such inclusion or use is at the customer's own risk. Should the customer use Axiris products for such application, the customer shall indemnify and hold Axiris harmless against all claims and damages. Trademarks Maxim Integrated is a trademark of Maxim Integrated Products, Inc. 1-Wire and ibutton are registered trademarks of Maxim Integrated Products, Inc. All product names, brands, and trademarks mentioned in this document are the property of their respective owners. 8 Contact Information Official website: 10