DS1775R5/T&R datasheet, PDF - EEWORLD Datasheet

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DS1775R5/T&R: DescriptionIC thermom/stat dig 101 sot-23-5; CategoryThe sensor; File Size435KB，14 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1775R5/T&R Overview

IC thermom/stat dig 101 sot-23-5

DS1775R5/T&R Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Maxim
package instruction	TSOP5/6,.11,37
Reach Compliance Code	not_compliant
Maximum accuracy (Celsius)	2 Cel
body width	1.625 mm
body height	1.25 mm
Body length or diameter	2.9 mm
shell	PLASTIC
JESD-609 code	e0
Installation features	SURFACE MOUNT
Number of digits	12
Number of terminals	5
Maximum working current	1 mA
Maximum operating temperature	125 °C
Minimum operating temperature	-55 °C
Output interface type	2-WIRE INTERFACE
Package body material	PLASTIC/EPOXY
Encapsulate equivalent code	TSOP5/6,.11,37
Package Shape/Form	RECTANGULAR
power supply	3/5 V
Sensor/temperature sensor type	TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL
Maximum supply voltage	5.5 V
Minimum supply voltage	2.7 V
surface mount	YES
Terminal surface	Tin/Lead (Sn/Pb)
Termination type	SOLDER

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DS1775

Digital Thermometer

and Thermostat in SOT23

GENERAL DESCRIPTION

The DS1775 digital thermometer and thermostat

provides temperature readings that indicate the

device’s temperature. Thermostat settings and

temperature readings are all communicated

to/from the DS1775 over a simple 2-wire serial

interface. No additional components are

required; the device is truly a “temperature-to-

digital” converter.

For applications that require greater temperature

resolution, the user can adjust the readout

resolution from 9 to 12 bits. This is particularly

useful in applications where thermal runaway

conditions must be detected quickly.

The open-drain thermal alarm output, O.S.,

becomes active when the temperature of the

device exceeds a user-defined temperature T

The number of consecutive faults required to set

O.S. active is configurable by the user. The

device can also be configured in the interrupt or

comparator mode, to customize the method

which clears the fault condition.

As a digital thermometer, the DS1775 is

software compatible with the DS75 2-wire

thermal watchdog. The DS1775 is assembled in

a compact 5-pin SOT23 package, allowing for

low-cost thermal monitoring/control in space-

constrained applications. The low thermal mass

allows for time constants previously only

possible with thermistors.

FEATURES

•

Temperature Measurements Require No

External Components

Measures Temperatures from -55°C to

+125°C (-67°F to +257°F)

±2.0°C

Thermometer Accuracy

Thermometer Resolution is Configurable

from 9 Bits to 12 Bits (0.5°C to 0.0625°C

Resolution)

User-Definable Thermostat Settings

Data is Read From/Written to Through a

2-Wire Serial Interface

2.7V to 5.5V Wide Power-Supply Range

Software Compatible with DS75 2-Wire

Thermal Watchdog in Thermometer Mode

Space-Conscious 5-Pin SOT23 Package with

Low Thermal Time Constant

PIN CONFIGURATION

SCL

GND

O.S.

SDA

SOT23

PIN DESCRIPTION

GND

SCL

SDA

O.S.

APPLICATIONS

•

Personal Computers/Servers/Workstations

Cell Phones

Office Equipment

Any Thermally-Sensitive System

Ground

2-Wire Serial Clock

2-Wire Serial Data Input/Output

Power-Supply Voltage

Thermostat Output Signal

Ordering Information appears at end of data sheet

1 of 14

19-6687; Rev 5/13

DS1775

Table 1. Detailed Pin Description

NAME

FUNCTION

Clock Input/Output for 2-Wire Serial Communication Port. This input should

SCL

be tied to GND for stand-alone thermostat operation.

GND

Ground

Thermostat Output. Open-drain output becomes active when temperature

O.S.

exceeds T

. Device configuration defines means to clear overtemperature

state.

Supply Voltage 2.7V to 5.5V Input Power Pin

Data Input/Output for 2-Wire Serial Communication Port. In the stand-alone

SDA

thermostat mode, this input selects hysteresis.

Figure 1 shows a block diagram of the DS1775. The DS1775 consists of five major components:

1. Precision temperature sensor

2. Analog-to-digital converter

3. 2-wire interface electronics

4. Data registers

5. Thermostat comparator

The factory-calibrated temperature sensor requires no external components. Upon power-up, the DS1775

begins temperature conversions with the default resolution of 9 bits (0.5°C resolution). The host can

periodically read the value in the temperature register, which contains the last completed conversion. As

conversions are performed in the background, reading the temperature register does not affect the

conversion in progress.

In power-sensitive applications, the user can put the DS1775 into a shutdown mode, under which the

sensor complete and store the conversion in progress and revert to a low-power standby state. In

applications where small incremental temperature changes are critical, the user can change the conversion

resolution from 9 bits to 10, 11, or 12. Each additional bit of resolution approximately doubles the

conversion time. This is accomplished by programming the configuration register. The configuration

thermostat output, number of consecutive faults to trigger an alarm condition, and the method to

terminate an alarm condition.

The user can also program overtemperature (T

) and undertemperature (T

HYST

) setpoints for thermostatic

operation. The power-up state of T

is +80°C and that for T

HYST

is +75°C. The result of each

temperature conversion is compared with the T

and T

HYST

setpoints. The DS1775 offers two modes for

temperature control, the comparator mode and the interrupt mode. This allows the user the flexibility to

customize the condition that would generate and clear a fault condition. Regardless of the mode chosen,

the O.S. output becomes active only after the measured temperature exceeds the respective trip-point a

consecutive number of times; the number of consecutive conversions beyond the limit to generate an O.S.

is programmable. The power-up state of the DS1775 is in the comparator mode with a single fault

generating an active O.S.

Digital data is written to/read from the DS1775 via a 2-wire interface, and all communication is MSb

first.

DETAILED DESCRIPTION

2 of 14

DS1775R5/T&R Related Products

	DS1775R5/T&R	DS1775R1/T&R
Description	IC thermom/stat dig 101 sot-23-5	IC thermom/stat dig 001 sot-23-5
Is it lead-free?	Contains lead	Contains lead
Is it Rohs certified?	incompatible	incompatible
Maker	Maxim	Maxim
package instruction	TSOP5/6,.11,37	TSOP5/6,.11,37
Reach Compliance Code	not_compliant	not_compliant
Maximum accuracy (Celsius)	2 Cel	2 Cel
body width	1.625 mm	1.625 mm
body height	1.25 mm	1.25 mm
Body length or diameter	2.9 mm	2.9 mm
shell	PLASTIC	PLASTIC
JESD-609 code	e0	e0
Installation features	SURFACE MOUNT	SURFACE MOUNT
Number of digits	12	12
Number of terminals	5	5
Maximum working current	1 mA	1 mA
Maximum operating temperature	125 °C	125 °C
Minimum operating temperature	-55 °C	-55 °C
Output interface type	2-WIRE INTERFACE	2-WIRE INTERFACE
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
Encapsulate equivalent code	TSOP5/6,.11,37	TSOP5/6,.11,37
Package Shape/Form	RECTANGULAR	RECTANGULAR
power supply	3/5 V	3/5 V
Maximum supply voltage	5.5 V	5.5 V
Minimum supply voltage	2.7 V	2.7 V
surface mount	YES	YES
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Termination type	SOLDER	SOLDER

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