DS7505U+T&R Maxim Integrated Products, DS7505U+T&R Datasheet

DS7505U+T&R

Manufacturer Part Number

DS7505U+T&R

Description

IC DGTL THERMOMETER 2WIRE 8-USOP

Manufacturer

Maxim Integrated Products

Datasheet

1.DS7505U.pdf (14 pages)

Specifications of DS7505U+T&R

Function

Thermometer, Thermostat

Topology

ADC (Sigma Delta), Comparator, Register Bank

Sensor Type

Internal

Sensing Temperature

-55°C ~ 125°C

Output Type

I²C™/SMBus™

Output Alarm

Output Fan

Voltage - Supply

1.7 V ~ 3.7 V

Operating Temperature

-55°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 14
Download datasheet (198Kb)

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

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.

and T

Networking Equipment

Cellular Base Stations

Office Equipment

Medical Equipment

Any Thermally Sensitive System

TOP VIEW

HYST

GND

SDA

SCL

O.S.

SCL

O.S.

) that are stored in EEPROM registers.

________________________________________________________________ Maxim Integrated Products

General Description

μMAX

DS7505

Pin Configurations

Digital Thermometer and Thermostat

Applications

VDD

♦ Operating Range from 1.7V to 3.7V

♦ Temperature Measurements Require No External

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

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

♦ Thermometer Resolution is User-Configurable

♦ 9-Bit Conversion Time is 25ms (max)

♦ Thermostatic Settings are User-Definable and

♦ Stand-Alone Thermostat Capability

♦ Data Read/Write Occurs Through a 2-Wire Serial

♦ Data Lines Filtered Internally for Noise Immunity

♦ Optional Bus Timeout Feature Prevents Lockup

♦ Multidrop Capability Simplifies Distributed

♦ Pin/Software Compatible with the LM75

♦ Available in 8-Pin SO and µMAX

+ Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

Commands are capitalized for clarity.

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

DS7505S+

DS7505S+T&R

DS7505U+

DS7505U+T&R

Components

(-67°F to +257°F)

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

Resolution)

Nonvolatile (NV)

Interface (SDA and SCL Pins)

(50ns Deglitch)

Problems on 2-Wire Interface

Temperature-Sensing Applications

PART

-55°C to +125°C

TEMP RANGE

Ordering Information

PIN-PACKAGE

8 SO (150 mils)

8 SO (150 mils),

2500-Piece T&R

8 μMAX

8 μMAX,

3000-Piece T&R

Packages

Features

Related parts for DS7505U+T&R

DS7505U+T&R Summary of contents

Page 1

... Denotes a lead(Pb)-free/RoHS-compliant package. 8 VDD T&R = Tape and reel Commands are capitalized for clarity. µMAX is a registered trademark of Maxim Integrated Products, Inc. Features ® Packages Ordering Information TEMP RANGE PIN-PACKAGE -55°C to +125° (150 mils (150 mils), -55°C to +125°C 2500-Piece T&R -55° ...

Page 2

Digital Thermometer and Thermostat ABSOLUTE MAXIMUM RATINGS Voltage Range on VDD Relative to Ground ..........-0.3V to +4.0V Voltage Range on Any Other Pin Relative to Ground.............................................-0.3V to +6.0V Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage ...

Page 3

Digital Thermometer and Thermostat AC ELECTRICAL CHARACTERISTICS (continued) (1.7V ≤ V ≤ 3.7V -55°C to +125°C, unless otherwise noted PARAMETER SYMBOL EEPROM Data Retention t Bus Free Time Between a STOP and START Condition START and ...

Page 4

Digital Thermometer and Thermostat PIN NAME 1 SDA Data Input/Output. For 2-wire serial communication port. Open drain. 2 SCL Clock Input. For 2-wire serial communication port. 3 O.S. Thermostat Output. Open drain. 4 GND Ground 5 A2 Address Input 6 ...

Page 5

Digital Thermometer and Thermostat Operation ⎯ Measuring The DS7505 measures temperature using a bandgap temperature-sensing architecture. An on-board delta- sigma analog-to-digital converter (ADC) converts the measured temperature to a digital value that is calibrat degrees Celsius; for Fahrenheit ...

Page 6

Digital Thermometer and Thermostat Shutdown Mode For power-sensitive applications, the DS7505 offers a low-power shutdown mode. The SD bit in the configura- tion register controls shutdown mode. When SD is pro- grammed to 1, the conversion in progress is completed ...

Page 7

Digital Thermometer and Thermostat IN THIS EXAMPLE, THE DS7505 IS CONFIGURED TO HAVE A FAULT TOLERANCE OF 2. TEMPERATURE O.S. OUTPUT—COMPARATOR MODE O.S. OUTPUT—INTERRUPT MODE Figure 4. O.S. Output Operation Example In interrupt mode, the O.S. output first becomes active ...

Page 8

Digital Thermometer and Thermostat Configuration Register The configuration register allows the user to program various DS7505 options such as conversion resolution, thermostat fault tolerance, thermostat polarity, thermo- stat operating mode, and shutdown mode. The configu- ration register is arranged as ...

Page 9

Digital Thermometer and Thermostat Table 3. Resolution Configuration THERMOMETER R1 R0 RESOLUTION (BITS Table 4. Fault Tolerance Configuration CONSECUTIVE OUT-OF-LIMITS F1 F0 CONVERSIONS TO TRIGGER O. ...

Page 10

Digital Thermometer and Thermostat Slave Address: Every slave device on the bus has a unique 7-bit address that allows the master to access that device. The DS7505’s 7-bit bus address where ...

Page 11

Digital Thermometer and Thermostat General 2-Wire Information • All data is transmitted MSB first over the 2-wire bus. • One bit of data is transmitted on the 2-wire bus each SCL period. • A pullup resistor is required on the ...

Page 12

Digital Thermometer and Thermostat Copy Data [48h] 0100 1000 Copies data from all SRAM shadow registers to EEPROM recommended that a Copy Data com- mand be performed after writing EEPROM-backed memory locations to guarantee data integrity in the ...

Page 13

Digital Thermometer and Thermostat For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE µMAX ______________________________________________________________________________________ Package Information PACKAGE CODE S8+2 U8+3 DOCUMENT NO. 21-0041 21-0036 13 ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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