DS7505

High-Precision Digital Thermometer and Thermostat

Improved LM75/DS75 Software-Compatible Temperature Sensor Is ¡À0.5¡ãC Accurate and Has Nonvolatile Thermostat Thresholds

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¡ãC to +125¡ãC range with ¡À0.5¡ãC accuracy over a -0¡ãC to +70¡ãC 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 (T_OS and T_HYST) that are stored in EEPROM registers.

Key Features

• Operating Range from 1.7V to 3.7V
• Temperature Measurements Require No External Components
• Measures Temperatures from -55¡ãC to +125¡ãC (-67¡ãF to +257¡ãF)
• ¡À0.5¡ãC Accuracy Over a 0¡ãC to +70¡ãC Range
• Thermometer Resolution is User-Configurable from 9 (Default) to 12 Bits (0.5¡ãC to 0.0625¡ãC 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

Diagram

Block Diagram

FROM: Company Name: Aunytor Electronic (HK) Co.,Ltd
            Contact Person: liao
            Skype: Aunytor
            Email: 2885745253@qq.com