DS7505

High-Precision Digital Thermometer and Thermostat

Improved LM75/DS75 Software-Compatible Temperature Sensor Is ±0.5°C Accurate and Has Nonvolatile Thermostat Thresholds

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Active: In Production.

Description

The DS7505 low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9-, 10-, 11-, or 12-bit digital temperature readings over a -55°C to +125°C range with ±0.5°C accuracy over a -0°C to +70°C range. A 9-bit resolution mode is software compatible with the LM75. Communication with the DS7505 is achieved through a simple 2-wire serial interface. Three address pins allow up to eight DS7505 devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature-sensing applications.

The DS7505 thermostat has a dedicated open-drain output (O.S.) and programmable fault tolerance, which allows the user to define the number of consecutive error conditions that must occur before O.S. is activated. There are two thermostatic operating modes that control thermostat operation based on user-defined trip points (TOS and THYST) that are stored in EEPROM registers.
 

Data Sheet

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Key Features

  • Operating Range from 1.7V to 3.7V
  • Temperature Measurements Require No External Components
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C Accuracy Over a 0°C to +70°C Range
  • Thermometer Resolution is User-Configurable from 9 (Default) to 12 Bits (0.5°C to 0.0625°C Resolution)
  • 9-Bit Conversion Time is 25ms (max)
  • Thermostatic Settings are User-Definable and Nonvolatile (NV)
  • Stand-Alone Thermostat Capability
  • Data Read/Write Occurs Through a 2-Wire Serial Interface (SDA and SCL Pins)
  • Data Lines Filtered Internally for Noise Immunity (50ns Deglitch)
  • Optional Bus Timeout Feature Prevents Lockup Problems on 2-Wire Interface
  • Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Pin/Software Compatible with the LM75
  • Available in 8-Pin SO and µMAX® Packages
 

Applications/Uses

  • Any Thermally Sensitive System
  • Cellular Base Stations
  • Medical Equipment
  • Networking Equipment
  • Office Equipment
   

Key Specifications:

Temperature Sensors
Part Number Sensor Type Functions Interface Accuracy
(±°C)
Parasite Pwr. Temp. Thresh. Temp. Resolution
(bits)
Multi Droppable Oper. Temp.
(°C)
Smallest Available Pckg.
(mm2)
Budgetary Price
max w/pins See Notes
DS7505  Local Standalone Thermostat 2-Wire/I2C/SMBus 0.5 No Programmable (NV)
9
10
11
12
Yes -55 to +125 15.6 $1.40 @1k
See All Temperature Sensors (104)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


Diagram

DS7505: Block Diagram
Block Diagram

More Information

New Product Press Release 2008-07-24 ]

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Information Index

Rev 1; 2008-04-03
This page last modified: 2009-07-31




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