DS1621+ Dallas Semiconductor, DS1621+ Datasheet

DS1621+

Manufacturer Part Number

DS1621+

Description

Thermometer; Digital, -55 to 125 C Range, 9-Bit Resolution, 2-Wire I'face, DIP8

Manufacturer

Dallas Semiconductor

Datasheet

1.DS1621.pdf (5 pages)

Specifications of DS1621+

Body Style

8-Pin DIP

Brand/series

DS1621

Function

Thermostat

Mounting Type

PCB

Output

Voltage

Primary Type

Thermostat

Range, Measurement

125 °C

Termination

Leaded

Voltage, Supply

5.5 V

Voltage, Switching

0.6 V

Lead Free Status / Rohs Status

RoHS Compliant part Electrostatic Device

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FEATURES

§ Temperature measurements require no

§ Measures temperatures from -55°C to +125°C

§ Temperature is read as a 9-bit value (2-byte

§ Wide power supply range (2.7V to 5.5V)

§ Converts temperature to digital word in less

§ Thermostatic settings are user definable and

§ Data is read from/written via a 2-wire serial

§ Applications include thermostatic controls,

§ 8-pin DIP or SO package (150mil and

DESCRIPTION

The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate

the temperature of the device. The thermal alarm output, T

device exceeds a user-defined temperature TH. The output remains active until the temperature drops

below user defined temperature TL, allowing for any hysteresis necessary.

User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to

insertion in a system. Temperature settings and temperature readings are all communicated to/from the

DS1621 over a simple 2-wire serial interface.

external components

in 0.5°C increments. Fahrenheit equivalent is

-67°F to 257°F in 0.9°F increments

transfer)

than 1 second

nonvolatile

interface (open drain I/O lines)

industrial systems, consumer products,

thermometers, or any thermal sensitive

system

208mil)

Digital Thermometer and Thermostat

PIN ASSIGNMENT

PIN DESCRIPTION

SDA

SCL

GND

OUT

GND

SDA

SCL

GND

SDA

SCL

OUT

DS1621 8-PIN DIP (300mil)

DS1621V 8-PIN SO (208mil)

DS1621S 8-PIN SO (150mil)

is active when the temperature of the

- 2-Wire Serial Data Input/Output

- 2-Wire Serial Clock

- Ground

- Thermostat Output Signal

- Chip Address Input

- Power Supply Voltage

DS1621

Related parts for DS1621+

DS1621+ Summary of contents

Page 1

FEATURES § Temperature measurements require no external components § 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 (2-byte transfer) § Wide power ...

Page 2

... ORDERING INFORMATION ORDERING PACKAGE NUMBER MARKING DS1621 DS1621 DS1621+ DS1621 (See Note) DS1621S DS1621 DS1621S+ DS1621 (See Note) DS1621S/T&R DS1621 DS1621S+T&R DS1621 (See Note) DS1621V DS1621V DS1621V+ DS1621V (See Note) DS1621V/T&R DS1621V DS1621V+T&R DS1621V (See Note) Note: A “+” symbol will also be marked on the package near the Pin 1 indicator. ...

Page 3

ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated ...

Page 4

Active Supply I CC Current Standby Supply I STBY Current Thermostat Output Output V OUT OL Voltage Temperature Conversion -55°C to +85°C Temperature Conversion +85°C to +125° Write Communication Only 1 mA Source 2.4 ...

Page 5

AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Temperature T TC Conversion Time NV Write Cycle t WR Time SCL Clock f SCL Frequency Bus Free Time t BUF Between a STOP and START Condition Hold Time t HD:STA (Repeated) START Condition Low ...

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