Rainbow Electronics LM95010 User Manual

LM95010

LM95010 Digital Temperature Sensor with SensorPath Bus in MSOP8 Package

November 2003

Digital Temperature Sensor with SensorPath
MSOP8 Package

General Description

The LM95010 is a digital output temperature sensor that has
single-wire interface compatible with National Semiconduc­tor’s SensorPath interface. It uses a ∆V
ture sensing technique that generates a differential voltage
that is proportional to temperature. This voltage is digitized
using a Sigma-Delta analog-to-digital converter. The
LM95010 is part of a hardware monitor system, comprised of
two parts: the PC System Health Controller (Master), such
as a Super I/O, and up to seven slaves of which four can be
LM95010s. Using SensorPath, the LM95010 will be con­trolled by the master and report to the master its own die
temperature. SensorPath data is pulse width encoded,
thereby allowing the LM95010 to be easily connected to
many general purpose micro-controllers.

analog tempera-

be

Features

n SensorPath Bus

— 4 hardware programmable addresses

Block Diagram

n Temperature Sensing

— 0.25 ˚C resolution
— 127.75 ˚C maximum temperature reading

n 8-lead MSOP package

Key Specifications

n Temperature Sensor Accuracy
n Temperature Range −20 ˚C to +125 ˚C
n Power Supply Voltage +3.0V to +3.6V
n Power Supply Current 0.5 mA (typ)
n Conversion Time 14 ms to 1456 ms

Applications

n Microprocessor based equipment

— (Motherboards, Base-stations, Routers, ATMs, Point

of Sale, …)

n Power Supplies

™

Bus in

±

2 ˚C (max)

20082001

SensorPath™is a trademark of National Semiconductor Corporation.

© 2003 National Semiconductor Corporation DS200820 www.national.com

Connection Diagram

Ordering Information

LM95010

Order
Number

LM95010CIMM T19C MUA08A 1000 units in

LM95010CIMMX T19C MUA08A 3500 units in

20082002

Package

Marking

Pin Description

Pin

Number Pin Name Type Description Typical Connection

1 V+/3.3VSBPower Positive power supply pin +3.3V pin. Should be powered by +3.3V Standby power.

This pin should be bypassed with a 0.1 µF
capacitor. A bulk capacitance of approximately
10 µF needs to be in the near vicinity of the
LM95010.

2-4 NC Must be grounded.

5 GND Power Ground System ground

6 ADD0 Input Address select input that assigns the serial

bus device number

7 ADD1 Input Address select input that assigns the serial

bus device number

8 SWD Input/

Output

Single-wire Data, SensorPath serial
interface line; Open-drain output

10k resistor to V+ or GND; must never be left
floating

10k resistor to V+ or GND; must never be left
floating

Super I/O with 1.25k pull-up to 3.3V

NS

Package

Number

Transport
Media

tape and reel

tape and reel

Typical Application

FIGURE 1. LM95010 connection to SensorPath master such as a Super I/O.

20082003

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LM95010

Absolute Maximum Ratings

(Notes 1, 2)

Supply Voltage (V

Voltage on Pin 2 −0.3 V to (V+ + 0.3 V)

+

) −0.5 V to 6.0 V

Soldering Information, Lead Temperature

MSOP-8 Package (Note 6)

Vapor Phase (60 seconds) 215 ˚C

Infrared (15 seconds) 220 ˚C

Voltage on all other Pins −0.5 V to 6.0 V

Input Current per Pin(Note 3) 5 mA

Package Input Current (Note 3) 30 mA

Package Power Dissipation (Note 5)

Output Sink Current 10 mA

Storage Temperature −65 ˚C to +150 ˚C

ESD Susceptibility (Note 4)

Human Body Model 2000 V

Operating Ratings

(Notes 1, 2)

Temperature Range for
Electrical Characteristics T

LM95010CIMM −20 ˚C ≤ TA≤ +125 ˚C

Operating Temperature Range −20 ˚C ≤ T

Supply Voltage Range (V+) +3.0 V to +3.6 V

MIN

≤ TA≤ T

≤ +125 ˚C

A

Machine Model 200 V

DC Electrical Characteristics

The following specifications apply for V+ = 3.0 VDCto 3.6 VDC, unless otherwise specified in the conditions. Boldface limits
apply for T

A=TJ=TMIN

to T

POWER SUPPLY CHARACTERISTICS

Symbol Parameter Conditions

V+ Power Supply Voltage 3.3 3.0

I+

AVG

I+

Peak

Average Power Supply Current SensorPath Bus Inactive (Note

Peak Power Supply Current SensorPath Bus Inactive (Note

Power-On Reset Threshold Voltage 1.6 V (min)

TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS

Parameter Conditions

Temperature Error T

Temperature Resolution 10 Bits

SWD and ADD DIGITAL INPUT CHARACTERISTICS

Symbol Parameter Conditions

SWD Logical High Input Voltage 2.1 V (min)

SWD Logical Low Input Voltage 0.8 V (max)

ADD Logical High Input Voltage 90%xV+ V (min)

ADD Logical Low Input Voltage 10%xV+ V (max)

SWD Input Hysteresis 300 mV

SWD and ADD Input Leakage

V

V

IH

V

IL

V

IH

V

IL

HYST

I

L

Current

SWD Input Leakage Current with V+
Open or Grounded

; all other limits TA= +25 ˚C.

MAX

= −20 ˚C and +125 ˚C (Note 10)

A

+25 ˚C ≤ T

T

A

GND ≤VIN≤ V+

GND ≤VIN≤ 3.6 V,
and V+ Open or
GND

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

V (min)

3.6

V (max)

500 750 µA (max)

9)

1.6 mA

9)

2.8 V (max)

≤ +60 ˚C (Note 10)

A

Typical

(Note 7)

±

1

Limits

(Note 8)

±

3 ˚C (max)

±

2 ˚C (max)

Units

(Limits)

0.25 ˚C

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

V+ + 0.5 V (max)

= 0 ˚C to +85 ˚C -0.5 V (min)

-0.3 V (min)

±

0.005

±

0.005 µA

±

10 µA (max)

MAX

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SWD and ADD DIGITAL INPUT CHARACTERISTICS

Symbol Parameter Conditions

LM95010

C

IN

Digital Input Capacitance 10 pF

Typical

(Note 7)

Limits

(Note 8)

SWD DIGITAL OUTPUT CHARACTERISTICS

Symbol Parameter Conditions

V

OL

Open-drain Output Logic “Low”
Voltage

I

OH

C

OUT

Open-drain Output Off Current

Digital Output Capacitance 10 pF

IOL=4mA 0.4 V (max)

I

=50µA 0.2 V (max)

OL

Typical

(Note 7)

±

0.005

Limits

(Note 8)

±

10 µA (max)

AC Electrical Characteristics

The following specification apply for V+ = +3.0VDCto +3.6VDC, unless otherwise specified. Boldface limits apply for
T

A=TJ=TMIN

to T

cation. Please refer to that specification for further details.

HARDWARE MONITOR CHARACTERISTICS

Symbol Parameter Conditions

t

CONV

SensorPath Bus CHARACTERISTICS

Symbol Parameter Conditions

t

f

t

r

t

INACT

t

Mtr0

t

Mtr1

t

SFEdet

t

SLout1

t

MtrS

t

SLoutA

t

RST

t

RST_MAX

; all other limits TA=TJ= 25 ˚C. The SensorPath Characteristics conform to the SensorPath specifi-

MAX

Typical

(Note 7)

(Note 8)

Total Monitoring Cycle Time (Note 11) Default 182 163.8 ms (min)

Typical

SWD fall time (Note 12) R

SWD rise time (Note 13) R

= 1.25 kΩ

pull-up

±

30%, CL= 400 pF

=

pull-up

±

= 400 pF

L

30%,

1.25 kΩ
C

(Note 7)

(Note 8)

Minimum inactive time (bus at high level)
guaranteed by the LM95010 before an
Attention Request

Master drive for Data Bit 0 write and for
Data Bit 0-1read

Master drive for Data Bit 1 write 35.4 µs (min)

Time allowed for LM95010 activity
detection

LM95010 drive for Data Bit 1 read by
master

Master drive for Start Bit 80 µs (min)

LM95010 drive for Attention Request 165 µs (min)

Master or LM95010 drive for Reset 354 µs (min)

Maximum drive of SWD by an LM95010,
after the power supply is raised above 3V

Units

(Limit)

Units

(Limit)

Limits

Units

(Limits)

200.2 ms (max)

Limits

Units

(Limits)

300 ns (max)

1000 ns (max)

11 µs (min)

11.8 µs (min)

17.0 µs (max)

48.9 µs (max)

9.6 µs (max)

28.3 µs (min)

38.3 µs (max)

109 µs (max)

228 µs (max)

500 ms (max)

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LM95010

20082004

FIGURE 2. Timing for Data Bits 0, 1 and Start Bit. See Section 1.2 "Bit Signaling" for further details.

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LM95010

FIGURE 3. Timing for Attention Request and Reset. See Section 1.2 "Bit Signaling" for further details.

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20082005