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Monitor Server Modules to Improve Efficiency and Reduce Down-Time

The controller in a module-based rack or chassis system often needs to identify which cards are installed, monitor key metrics, such as temperature, and track hot-swapped units. The 1-Wire® memory, I/O, and temperature-sensor products solve this problem by providing a unique identity for every module in the system, allowing all devices to be interrogated over a common 1-Wire connection.

Benefits of 1-Wire products

  • Backplane connector complexity is minimized
  • Operating power is derived entirely from the 1-Wire line, over a single twisted pair
  • Automatic module detection enables hot/live system insertion
  • Wide operating ranges: +2.8V to +5.25V, -40°C to +85°C
  • Each part is uniquely identified by a factory-lasered 64-Bit ROM ID
  • 1-Wire line drivers can offload 1-Wire communication from the host software

1-Wire Devices for Rack/Blade Servers

Device Function User memory Communication Benefit
DS28E04-100 Addressable EEPROM with PIO, Sequence Detect 4Kbit 1-Wire Allows host system to detect physical location of each module.
DS2431 EEPROM 1Kbit 1-Wire Provides module identification and programmable memory.
DS28EA00 Digital Thermometer, PIO, Sequence Detect - 1-Wire Ensures equipment is in the proper temperature range. Detects sequence without need for DS28E04-100. PIO can be used to power an LED to alert technician when a problem is detected.
DS2413 Addressable Switch - 1-Wire Provides programmable I/O pins.
DS2484 Single Channel 1-Wire Master - I2C slave, 1-Wire master Offloads 1-Wire communication from host software.
DS2482-800 8 Channel 1-Wire Master - I2C slave, 1-Wire master Offloads 1-Wire communication from host software. Provides eight physical 1-Wire lines.
DS28E25 Secure Authenticator 4Kbit 1-Wire Provides counterfeit protection and ensures modules are genuine OEM equipment.

1-Wire Memory 
DeepCover® Secure Authenticators 

Digital Thermometer 
1-Wire Master 

Technical Documentation

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Inventory and Asset Tracking
Take inventory of an entire server rack or blade system by embedding a 1-Wire memory IC in each module. Reduce time and labor costs associated with manual asset tracking and inventory counts. 1-Wire EEPROM devices include user memory and a unique ROM ID (serial number).

Diagnostics
1-Wire addressable EEPROM devices allow the master to determine the sequence and physical location of modules. Use these 1-Wire devices to:

  • Eliminate errors in identifying equipment in need of rebooting or other types of service.
  • Identify in-use and available rack space and improve efficiency of rack re-configurations.

Security
Improve data center security by alerting when an asset is moved or removed; this is a great application for 1-Wire serial EEPROM devices.

To take security a step further, a DeepCover Secure Authenticator can be embedded in each module to provide secure authentication, to ensure that the module is genuine to the OEM.

Temperature
Monitor thermal state of inventory in real-time with a 1-Wire Digital Thermometer with Sequence Detect and PIO

  • Sequence detect determines the physical location of modules
  • PIO powers an indicator LED when problems occur, such as equipment outages and overheating

Application Notes: