DS1621V/T&R; datasheet, PDF - EEWORLD Datasheet

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DS1621V/T&R;: DescriptionSENSOR TEMPERATURE I2C 8SOIC; CategoryThe sensor; File Size436KB，16 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1621V/T&R; Overview

SENSOR TEMPERATURE I2C 8SOIC

DS1621V/T&R; Parametric

Parameter Name	Attribute value
sensor type	digital, local
Check temperature - local	-55°C ~ 125°C
Detect temperature - remote	-
Output type	I²C
Voltage - Power	2.7 V ~ 5.5 V
resolution	8 b
characteristic	Single trigger, output switch, standby mode
Accuracy - highest (lowest)	±0.5°C（±2°C）
Test Conditions	0°C ~ 70°C（-55°C ~ 125°C）
Operating temperature	-55°C ~ 125°C
Installation type	surface mount
Package/casing	8-SOIC (0.209", 5.30mm wide)
Supplier device packaging	8-SOIC

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DS1621

Digital Thermometer and

BENEFITS AND 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 (2-

Byte Transfer)

Converts Temperature to Digital Word in

Less than 1s

Thermostatic Settings are User Definable

And Nonvolatile

Can Be Used in a Wide Variety of

Applications

Power Supply Range (2.7V to 5.5V)

Data is Read From/Written Via a 2-Wire

Serial Interface (Open Drain I/O Lines)

Saves Space

Temperature Measurements Require No

External Components

8-pin DIP or SO package (208-mil)

Packages

⋅

Thermostatic Controls

Industrial Systems

Consumer Products

Thermometers

PIN ASSIGNMENT

SDA

SCL

OUT

GND

DS1621S 8-PIN SO (150mil)

DS1621V 8-PIN SO (208mil)

SDA

SCL

OUT

GND

DS1621 8-PIN DIP (300mil)

APPLICATIONS

SDA

SCL

GND

OUT

PIN DESCRIPTION

- 2-Wire Serial Data Input/Output

- 2-Wire Serial Clock

- Ground

- Thermostat Output Signal

- Chip Address Input

- Power Supply Voltage

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

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

OUT

is active when the temperature of the

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.

1 of 16

19-7540; Rev 4; 3/15

DESCRIPTION

In one-shot mode, the DS1621 performs a single temperature conversion when a Start Convert T

command is issued. When the conversion is complete, the device enters a low-power idle state and

remains in that state until a single temperature conversion is again initiated by a Start Convert T

command.

Thermostat Control

In its operating mode, the DS1621 functions as a thermostat with programmable hysteresis as shown in

Figure 3. The thermostat output updates as soon as a temperature conversion is complete.

DS1621

When the DS1621’s temperature meets or exceeds the value stored in the high temperature trip register

(TH), the output becomes active and will stay active until the temperature falls below the temperature

stored in the low temperature trigger register (TL). In this way, any amount of hysteresis may be

obtained.

The active state for the output is programmable by the user so that an active state may either be a logic

"1" (V

) or a logic "0" (0V). This is done using the POL bit in the configuration reagister as explained

in the

Operation and Control

section of this datasheet.

Figure 3. THERMOSTAT OUTPUT OPERATION

DQ (Thermostat output, Active = High)

T (°C)

OPERATION AND CONTROL

The DS1621 must have temperature settings resident in the TH and TL registers for thermostatic

operation. A configuration/status register also determines the method of operation that the DS1621 will

use in a particular application, as well as indicating the status of the temperature conversion operation.

The configuration register is defined as follows:

MSb

DONE

where

DONE

= Conversion Done bit. “1” = Conversion complete, “0” = Conversion in progress.

THF

= Temperature High Flag. This bit will be set to “1” when the temperature is greater than or

equal to the value of TH. It will remain “1” until reset by writing “0” into this location or removing power

from the device. This feature provides a method of determining if the DS1621 has ever been subjected to

temperatures above TH while power has been applied.

5 of 16

Bit 6

THF

Bit5

TLF

Bit 4

NVB

Bit 3

Bit 2

Bit 1

POL

LSb

1SHOT

DS1621V/T&R; Related Products

	DS1621V/T&R;	DS1621	DS1621V	DS1621S/T&R;	DS1621V+T&R;	DS1621S+T&R;	DS1621S+W
Description	SENSOR TEMPERATURE I2C 8SOIC	DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, THROUGH HOLE MOUNT	DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT	SENSOR TEMPERATURE I2C 8SOIC	SENSOR TEMPERATURE I2C 8SOIC		Serial Switch/Digital Sensor,

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