General Description

The DS7505 low-voltage (1.7V to 3.7V) digital ther-

mometer and thermostat provides 9-, 10-, 11-, or 12-bit

digital temperature readings over a -55°C to +125°C

range with

±0.5°C accuracy over a -0°C to +70°C 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 out-

put (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

Applications

Networking Equipment

Cellular Base Stations

Office Equipment

Medical Equipment

Any Thermally Sensitive System

Features

o

Operating Range from 1.7V to 3.7V

o

Temperature Measurements Require No External

Components

o

Measures Temperatures from -55°C to +125°C

(-67°F to +257°F)

o

±0.5°C Accuracy Over a 0°C to +70°C Range

o

Thermometer Resolution is User-Configurable

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

Resolution)

o

9-Bit Conversion Time is 25ms (max)

o

Thermostatic Settings are User-Definable and

Nonvolatile (NV)

o

Stand-Alone Thermostat Capability

o

Data Read/Write Occurs Through a 2-Wire Serial

Interface (SDA and SCL Pins)

o

Data Lines Filtered Internally for Noise Immunity

(50ns Deglitch)

o

Optional Bus Timeout Feature Prevents Lockup

Problems on 2-Wire Interface

o

Multidrop Capability Simplifies Distributed

Temperature-Sensing Applications

o

Pin/Software Compatible with the LM75

o

Digital Thermometer and Thermostat

________________________________________________________________ Maxim Integrated Products

1

SO

TOP VIEW

27

A0

SCL

1

8

VDD

SDA

A1

O.S.

3

6

A2

GND

45

DS7505

µ

µMAX

27

A0

SCL

1

8

VDD

SDA

A1

O.S.

3

6

A2

GND

4

5

DS7505

Pin Configurations

Ordering Information

Rev 1; 3/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

DS7505S+

-55°C to +125°C

8 SO (150 mils)

DS7505S+T&R

-55°C to +125°C

8 SO (150 mils),

2500-Piece T&R

DS7505U+

-55°C to +125°C

8 µMAX

DS7505U+T&R

-55°C to +125°C

8 µMAX,

3000-Piece T&R

+Denotes a lead-free package.

T&R = Tape and reel.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Commands are capitalized for clarity.