DS1620

Digital Thermometer and Thermostat


Description

The DS1620 Digital Thermometer and Thermostat provides 9-bit temperature readings which indicate the temperature of the device. With three thermal alarm outputs, the DS1620 can also act as a thermostat. THIGH is driven high if the DS1620's temperature is greater than or equal to a user-defined temperature TH. TLOW is driven high if the DS1620's temperature is less than or equal to a user-defined temperature TL. TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls below that of TL.

User-defined temperature settings are stored in nonvolatile memory, so parts can be programmed prior to insertion in a system, as well as used in standalone applications without a CPU. Temperature settings and temperature readings are all communicated to/from the DS1620 over a simple 3-wire interface.
DS1620: Functional Block Diagram DS1620: Functional Block Diagram Enlarge+

Key Features

  • Simply Adds Temperature Monitoring and Control to Any System
    • Measures Temperatures From -55°C to +125°C in 0.5°C Increments; Fahrenheit Equivalent is -67°F to +257°F in 0.9°F Increments
    • Temperature is Read as a 9-Bit Value
    • Converts Temperature to Digital Word in 750ms (max)
    • Thermostatic Settings are User-Definable and Nonvolatile
  • Can Be Used in a Wide Variety of Applications
    • Supply Voltage Range Covers From 2.7V to 5.5V
    • Data is Read From/Written Via a 3-Wire Serial Interface (CLK, DQ, Active-Low RST )
  • Saves Space
    • Requires No External Components
    • 8-Pin DIP or SOIC (208-mil) Packages

Applications/Uses

  • Consumer Products
  • Industrial Systems
  • Thermometers
  • Thermostatic Controls
Part Number Sensor Type Functions Interface Accuracy
(±°C)
Parasite Pwr. Temp. Thresh. Temp. Resolution
(bits)
Oper. Temp.
(°C)
Package/Pins Budgetary
Price
See Notes
DS1620  Local
Dual Temperature Alarms
Standalone Thermostat
3-Wire
Logic
0.5 No Programmable (NV) 9 -55 to +125
PDIP(N)/8
SOIC/8
$3.23 @1k
See All Temperature Sensors (111)

Part Number Functions Interface Accuracy
(±°C)
Temp. Thresh.
(°C)
Package/Pins Budgetary
Price
See Notes
DS1620 
Dual Temperature Alarms
Standalone Thermostat
3-Wire
Logic
0.5 Programmable
PDIP(N)/8
SOIC/8
$3.23 @1k
See All Temperature Switches (21)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Tools & Models

DS1620 IBIS Model

 

Related Resources


MAX31856
Precision Thermocouple to Digital Converter with Linearization

  • Provides High-Accuracy Thermocouple Temperature Readings
  • Internal Cold-Junction Compensation Minimizes System Components
  • ±45V Input Protection Provides Robust System Performance