DS75LVS+ Datasheet DS75LVS+, DS75LVU+ | P1-P3

General Description

The DS75LV low-voltage (1.7V to 3.7V) digital thermometer

and thermostat provides 9, 10, 11, or 12-bit digital temperature

readings over a -55°C to +125°C range with ±2°C accuracy

over a -25°C to +100°C range. At power-up, the DS75LV

defaults to 9-bit resolution for software compatibility with the

LM75. Communication with the DS75LV is achieved through

a simple 2-wire serial interface.

The DS75LV thermostat has a dedicated open-drain output

(OS) and programmable fault tolerance, which allows the

user to define the number of consecutive error conditions that

must occur before OS is activated. There are two thermostatic

operating modes that control thermostat operation based on

user-defined trip-points (T

and T

HYST

Applications

● Personal Computers

● Cellular Base Stations

● Ofce Equipment

● Any Thermally Sensitive System

Benets and Features

● Extend Performance Range with Low-Voltage,

1.7V to 3.7V Operating Range

● Maximize System Accuracy in Broad Range of

Thermal Management Applications

• Measures Temperature from -55°C to +125°C

(-67°F to +257°F)

• ±2°C Accuracy over a -25°C to 100°C Range

• User-Congurable Resolution from 9 Bits (Default)

to 12 Bits (0.5°C to 0.0625°C)

● Easy Upgrade to LM75: Pin and Software Compatible

● Simplify Distributed Temperature-Sensing

Applications with Multidrop Capability

• Up to Eight DS75LVs Can Operate on 2-Wire Bus

● Increase Reliability and System Robustness

• Internally Filtered Data Lines for Noise Immunity

(50ns Deglitch)

• Bus Timeout Feature Prevents Lockup on 2-Wire

Interface

● Minimize Power Consumption with Built-In Shutdown

Mode

● Flexible User-Defined Thermostatic Modes with

Programmable Fault Tolerance

Ordering Information appears at end of data sheet.

19-7469; Rev 4; 3/16

DS75LV Digital Thermometer and Thermostat

Functional Block Diagram

TOS AND THYST

REGISTERS

CONFIGURATION

TEMPERATURE

OVERSAMPLING

MODULATOR

PRECISION

REFERENCE

DIGITAL

DECIMATOR

ADDRESS

AND

I/O CONTROL

SCL

SDA

GND

THERMOSTAT

COMPARATOR

DS75LV

Voltage on V

, Relative to Ground ....................-0.3V to +4.0V

Voltage on Any Other Pin, Relative to Ground ....-0.3V to +6.0V

Operating Temperature Range ......................... -55°C to +125°C

Storage Temperature Range ............................ -55°C to +125°C

Lead Temperature (soldering, 10s) .................................+260°C

(1.7V ≤ V

≤ 3.7V, T

= -55°C to +125°C, unless otherwise noted.)

(1.7V ≤ V

≤ 3.7V, T

= -55°C to +125°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

Supply Voltage V

1.7 3.7 V

Thermometer Error (Note 1) T

ERR

-25 to +100 ±2.0

°C

-55 to +125 ±3.0

Input Logic-High V

(Note 2) 0.7 x V

5.5 V

Input Logic-Low V

(Note 2) -0.5 0.3 x V

SDA Output Logic Low Voltage

(Note 2)

OL1

3mA sink current 0 0.4

OL2

6mA sink current 0 0.6

OS Saturation Voltage V

4mA sink current (Notes 1, 2) 0.8 V

Input Current Each I/O Pin 0.4 < V

I/O

< 0.9 x V

-10 +10 µA

I/O Capacitance C

I/O

10 pF

Standby Current I

DD1

(Notes 3, 4) 2 µA

Active Current (Notes 3, 4) I

Active temp conversions 1000

µA

Communication only 100

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Resolution 9 12 Bits

Temperature Conversion Time t

CONVT

9-bit conversions 25

10-bit conversions 50

11-bit conversions 100

12-bit conversions 200

SCL Frequency f

SCL

400 kHz

Bus Free Time Between a

STOP and START Condition

BUF

(Note 5) 1.3 µs

START and Repeated START

Hold Time from Falling SCL

HD:STA

(Notes 5, 6) 600 ns

DS75LV Digital Thermometer and Thermostat

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Maxim Integrated

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Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

DC Electrical Characteristics

AC Electrical Characteristics

(1.7V ≤ V

≤ 3.7V, T

= -55°C to +125°C, unless otherwise noted.)

Note 1: Internal heating caused by OS loading causes the DS75LV to read approximately 0.5°C higher if OS is sinking the max

rated current.

Note 2: All voltages are referenced to ground.

Note 3: I

specified with V

at 3.0V and SDA, SCL = 3.0V, 0°C to +70°C.

Note 4: I

specified with OS pin open.

Note 5: See Figure 2 for timing diagram. All timing is referenced to 0.9 x V

and 0.1 x V

Note 6: After this period, the first clock pulse is generated.

Note 7: The DS75LV provides an internal hold time of at least 75ns on the SDA signal to bridge the undefined region of SCL’s

falling edge.

Note 8: This timeout applies only when the DS75LV is holding SDA low. Other devices can hold SDA low indefinitely and the

DS75LV does not reset.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Low Period of SCL t

LOW

(Note 5) 1.3 µs

High Period of SCL t

HIGH

(Note 5) 0.6 µs

Repeated START Condition

Setup Time to Rising SCL

SU:STA

(Note 5) 600 ns

Data-Out Hold Time from

Falling SCL

HD:DAT

(Notes 5, 7) 0 0.9 µs

Data-In Setup Time to Rising

SCL

SU:DAT

(Note 5) 100 ns

Rise Time of SDA and SCL

(Receive)

(Note 5) 1000 ns

Fall Time of SDA and SCL

(Receive)

(Note 5) 300 ns

Spike Suppression Filter Time

(Deglitch Filter)

0 50 ns

STOP Setup Time to Rising

SCL

SU:STO

(Note 5) 600 ns

Capacitive Load for Each Bus

Line

400 pF

Input Capacitance C

5 pF

Serial Interface Reset Time t

TIMEOUT

SDA time low (Note 8) 75 325 ms

DS75LV Digital Thermometer and Thermostat

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Maxim Integrated

│

AC Electrical Characteristics (continued)

P1-P3 P4-P6 P7-P9 P10-P12 P13-P14

DS75LVS+

Mfr. #:

Buy DS75LVS+

Manufacturer:

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Description:

Board Mount Temperature Sensors Low-Voltage Digital

Lifecycle:

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DS75LVS+

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