MAXIM DS1631, DS1631A, DS1731 User Manual

SC

SDA

μ

SC

SDA

www.maxim-ic.com

FEATURES

 DS1631 and DS1631A Provide ±0.5°C

Accuracy over a 0°C to +70°C Range

 DS1731 Provides ±1°C Accuracy over a

-10°C to +85°C Range

 DS1631A Automatically Begins Taking

Temperature Measurements at Power-Up

 Operating Temperature Range: -55°C to

+125°C (-67°F to +257°F)

 Temperature Measurements Require No

External Components

 Output Resolution is User-Selectable to 9,

10, 11, or 12 Bits

 Wide Power-Supply Range (+2.7V to +5.5V)  Converts Temperature-to-Digital Word in

750ms (max)

 Multidrop Capability Simplifies Distributed

Temperature-Sensing Applications

 Thermostatic Settings are User-Definable

and Nonvolatile (NV)

 Data is Read/Written Through 2-Wire Serial

Interface (SDA and SCL Pins)

 All Three Devices are Available in 8-Pin

μSOP Packages and the DS1631 is Also Available in a 150mil SO package—see Table 1 for Ordering Information

DESCRIPTION

DS1631/DS1631A/DS1731

High-Precision Digital

Thermometer and Thermostat

PIN CONFIGURATIONS

T

OUT

GND

(DS1631U+, DS1631AU+,

T

OUT

GND

SO (150mil and 208mil)

(DS1631Z+, DS1631S+)

See Table 2 for Pin Descriptions

APPLICATIONS

 Network Routers and Switches  Cellular Base Stations  Portable Products  Any Space-Constrained Thermally Sensitive

Product

2

L

3

DS1731U+)

L

SOP

2

3

V

DD

7

A

0

6

A

1

A

2

VDD A

7

0

A

6

1

A

2

The DS1631, DS1631A, and DS1731 digital thermometers provide 9, 10, 11, or 12-bit temperature readings over a -55°C to +125°C range. The DS1631 and DS1631A thermometer accuracy is ±0.5°C from 0°C to +70°C with 3.0V ≤ V

3.0V ≤ V points (T

≤ 5.5V. The thermostat on all three devices provides custom hysteresis with user-defined trip

DD

and TL). The TH and TL registers and thermometer configuration settings are stored in NV

H

≤ 5.5V, and the DS1731 accuracy is ±1°C from -10°C to +85°C with

DD

EEPROM so they can be programmed prior to installation. In addition, the DS1631A automatically begins taking temperature measurements at power-up, which allows it to function as a stand-alone thermostat. Communication with the DS1631/DS1631A/DS1731 is achieved through a 2-wire serial interface, and three address pins allow up to eight devices to be multidropped on the same 2-wire bus.

Pin descriptions for the DS1631/DS1631A/DS1731 are provided in Table 2 and user-accessible registers are summarized in Table 3. A functional diagram is shown in Figure 1.

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Table 1. ORDERING INFORMATION

DS1631/DS1631A/DS1731

ORDERING

NUMBER

DS1631U+ D1631 (See Note) DS1631U+T&R D1631 (See Note)

PACKAGE MARKING

DESCRIPTION

DS1631 in Lead-Free 8-Pin μSOP DS1631 in Lead-Free 8-Pin μSOP, 3000 Piece Tape-and-

Reel

DS1631Z+ DS1631Z (See Note) DS1631 in Lead-Free 150 mil 8-Pin SO DS1631Z+T&R DS1631Z (See Note) DS1631AU+ 1631A (See Note) DS1631AU+T&R 1631A (See Note)

DS1631 in Lead-Free 150 mil 8-Pin SO, 2500 Piece Tapeand-Reel

DS1631A in Lead-Free 8-Pin μSOP DS1631A in Lead-Free 8-Pin μSOP, 3000 Piece Tape-and-

Reel

DS1631S+ DS1631S (See Note) DS1631 in Lead-Free 208 mil 8-Pin SO DS1631S+T&R DS1631S (See Note)

DS1631 in Lead-Free 208 mil 8-Pin SO, 2000 Piece Tape-

and-Reel DS1631+ DS1631 (See Note) DS1631 in Lead-Free 300 mil 8-Pin DIP DS1731U+ D1731 (See Note)

DS1731U+T&R D1731 (See Note) DS1631U D1631

DS1631U/T&R D1631

DS1731 in Lead-Free 8-Pin μSOP

DS1731 in Lead-Free 8-Pin μSOP, 3000 Piece Tape-and-

Reel

DS1631 in 8-Pin μSOP

DS1631 in 8-Pin μSOP, 3000-Piece Tape-and-Reel DS1631Z DS1631Z DS1631 in 150mil 8-Pin SO DS1631Z/T&R DS1631Z DS1631 in 150mil 8-Pin SO, 2500-Piece Tape-and-Reel DS1631AU 1631A DS1631AU/T&R 1631A

DS1631A in 8-Pin μSOP

DS1631A in 8-Pin μSOP, 3000-Piece Tape-and-Reel DS1631S DS1631S DS1631 in 208 mil 8-Pin SO

DS1631S/T&R DS1631S

DS1631 in Lead-Free 208 mil 8-Pin SO, 2000 Piece Tape-

and-Reel DS1631 DS1631 DS1631 in 300 mil 8-Pin DIP DS1731U D1731 DS1731U/T&R D1731

DS1731 in 8-Pin μSOP

DS1731 in 8-Pin μSOP, 3000-Piece Tape-and-Reel

Note: A "+" symbol will also be marked on the package near the Pin 1 indicator

Table 2. DETAILED PIN DESCRIPTION

PIN SYMBOL DESCRIPTION

1 SDA Data Input/Output Pin for 2-Wire Serial Communication Port. Open-Drain. 2 SCL Clock Input Pin for 2-Wire Serial Communication Port. 3 T

Thermostat Output Pin. Push-Pull.

OUT

4 GND Ground Pin 5 A2 Address Input Pin 6 A1 Address Input Pin 7 A0 Address Input Pin 8 VDD Supply Voltage Pin. +2.7V to +5.5V Power-Supply Pin.

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DS1631/DS1631A/DS1731

A

0

A

OU

Figure 1. FUNCTIONAL DIAGRAM

VDD

CONFIGURATION REGISTER

ND CONTROL LOGIC

SCL

SD

GND

1 2

ADDRESS

AND

I/O CONTROL

TEMPERATURE SENSOR

and ΔΣ ADC

TEMPERATURE REGISTER

REGISTER

T

H

TL REGISTER

DIGITAL

COMPARATOR/LOGIC

ABSOLUTE MAXIMUM RATINGS*

Voltage on any Pin Relative to Ground -0.5V to +6.0V Operating Temperature Range -55°C to +125°C Storage Temperature Range -55°C to +125°C Solder Dip Temperature (10s) See IPC/JEDEC J-STD-020A Specification Reflow Oven Temperature +220°C

T

* These are stress ratings only and functional operation of the device at these or any other conditions

above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

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DS1631/DS1631A/DS1731

DC ELECTRICAL CHARACTERISTICS

(V

= 2.7V to 5.5V; TA = -55°C to +125°C.)

DD

PARAMETER SYMBOL CONDITION MIN MAX UNITS NOTES

Supply Voltage VDD 2.7 5.5 V 1

DS1631, DS1631A Thermometer Error

T

ERR

0°C to +70°C,

3.0V ≤ V 0°C to +70°C,

2.7V ≤ V

≤ 5.5V

DD

< 3.0V

DD

±0.5

±1

°C 2

-55°C to +125°C ±2

DS1731 Thermometer Error

T

ERR

-10°C to +85°C,

3.0V ≤ V

-10°C to +85°C,

2.7V ≤ V

≤ 5.5V

DD

< 3.0V

DD

±1

±1.5

°C 2

-55°C to +125°C ±2

Low-Level Input Voltage High-Level Input Voltage

Output Voltage Input Current Each

I/O Pin

VIL -0.5 0.3 x VDD V

VIH

V

3mA sink current 0 0.4 SDA Low-Level

OL1

V

6mA sink current 0 0.6

OL2

0.4 < V

< 0.9VDD -10 +10 µA

I/O

0.7 x VDD

VDD + 0.3 V

V

Temperature

Active Supply Current

IDD

conversion

-55°C to +85°C Temperature conversion

1

mA

1.25

3

+85°C to +125°C

Standby Supply Current

Output Logic

OUT

Voltage

E2 write 400 Communication only 110

I

0°C to +70°C 800 nA 4

STBY

VOH 1mA source current 2.4 V 1 T

4mA sink current 0.4 V 1

V

OL

µA

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DS1631/DS1631A/DS1731

AC ELECTRICAL CHARACTERISTICS

(V

= 2.7V to 5.5V; TA = -55°C to +125°C.)

DD

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

9-bit resolution 93.75

Temperature Conversion Time

SCL Frequency f

10-bit resolution

tTC

11-bit resolution 12-bit resolution

0 400 kHz

SCL

187.5

375

ms

750

Bus Free Time Between a STOP and

t

1.3 µs 5

BUF

START Condition START and Repeated START Hold Time

t

HD:STA

0.6 µs 5, 6 from Falling SCL Low Period of SCL t High Period of SCL t

1.3 µs 5

LOW

0.6 µs 5

HIGH

Repeated START Condition Setup Time

t

SU:STA

0.6 µs 5 to Rising SCL Data-Out Hold Time from Falling SCL Data-In Setup Time to Rising SCL

t

HD:DAT

t

SU:DAT

Rise Time of SDA and SCL Fall Time of SDA and SCL STOP Setup Time to Rising SCL

t

SU:STO

Capacitive Load for Each Bus Line I/O Capacitance C

100 ns 5

tR 20 + 0.1CB 1000 ns 5, 7

tF 20 + 0.1CB 300 ns 5, 7

0.6 µs 5

C

400 pF

B

I/O

10 pF

0

0.9 µs 5

Input Capacitance CI 5 pF Spike Pulse Width that can be Suppressed by

tSP 0 50 ns

Input Filter

NOTES:

1) All voltages are referenced to GND.

2) See Figure 2 for Typical Operating Curves.

3) Specified with T

4) Specified with temperature conversions stopped; T

A

= 0V or VDD.

2

5) See Timing Diagram in Figure 3. All timing is referenced to 0.9 x V

6) After this period the first clock pulse is generated.

7) For example, if C

pin open; A0, A1, A2 = 0V or VDD; and f

OUT

= 300pF, then tR[min] = tF[min] = 50ns.

B

≥ 2Hz.

SCL

pin open; SDA = VDD; SCL = VDD; and A0, A1,

and 0.1 x VDD.

DD

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