Analog Devices ADM1023ARQ Datasheet

ACPI-Compliant

High-Accuracy Microprocessor

a

FEATURES
Next Generation Upgrade to ADM1021
On-Chip and Remote Temperature Sensing
Offset Registers for System Calibration
1ⴗC Accuracy and Resolution on Local Channel

0.125ⴗC Resolution/1ⴗC Accuracy on Remote Channel
Programmable Over/Under Temperature Limits
Programmable Conversion Rate
Supports System Management Bus (SMBus) Alert
2-Wire SMBus Serial Interface
200 ␮A Max Operating Current (0.25 Conversions/

Seconds)
1 ␮A Standby Current
3 V to 5.5 V Supply
Small 16-Lead QSOP Package

APPLICATIONS
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecomms Equipment
Instrumentation

FUNCTIONAL BLOCK DIAGRAM

System Temperature Monitor

ADM1023*

PRODUCT DESCRIPTION

The ADM1023 is a two-channel digital thermometer and under/
over temperature alarm, intended for use in personal computers
and other systems requiring thermal monitoring and management.
Optimized for the Pentium
allows systems designers to safely reduce temperature guard
banding and increase system performance. The device can
measure the temperature of a microprocessor using a diode-con­nected PNP transistor, which may be provided on-chip in the
case of the Pentium
cost discrete NPN/PNP device such as the 2N3904/2N3906.
A novel measurement technique cancels out the absolute value
of the transistor’s base emitter voltage, so that no calibration
is required. The second measurement channel measures the
output of an on-chip temperature sensor, to monitor the tem­perature of the device and its environment.

The ADM1023 communicates over a 2-wire serial interface
compatible with SMBus
ture limits can be programmed into the device over the serial
bus, and an ALERT output signals when the on-chip or remote
temperature is out of range. This output can be used as an
interrupt, or as an SMBus alert.

®

III; the higher accuracy offered

III or similar processors, or can be a low

standards. Under and over tempera-

ON-CHIP

TEMPERATURE

D+

D–

SENSOR

ANALOG

MUX

BUSY

EXTERNAL DIODE OPEN-CIRCUIT

LOCAL TEMPERATURE

A-TO-D

CONVERTER

RUN/STANDBY

VALUE REGISTER

REMOTE TEMPERATURE

VALUE REGISTERS

ADM1023

NC V

DD

*Patents pending.
Pentium is a registered trademark of Intel Corporation.

GNDNCGND NC NC NC

NC = NO CONNECT

REV. B

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

ADDRESS POINTER

REGISTER

ONE-SHOT
REGISTER

CONVERSION RATE

REGISTER

OFFSET

REGISTERS

LOCAL TEMPERATURE

LOW-LIMIT COMPARATOR

LOCAL TEMPERATURE

HIGH-LIMIT COMPARATOR

REMOTE TEMPERATURE

LOW-LIMIT COMPARATOR

REMOTE TEMPERATURE

HIGH-LIMIT COMPARATOR

STATUS REGISTER

SMBUS INTERFACE

SDATA

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

SCLK

ADD0 ADD1

LOCAL TEMPERATURE

LOW-LIMIT REGISTER

LOCAL TEMPERATURE

HIGH-LIMIT REGISTER

REMOTE TEMPERATURE

LOW-LIMIT REGISTERS

REMOTE TEMPERATURE

HIGH-LIMIT REGISTERS

CONFIGURATION

REGISTER

INTERRUPT

MASKING

STBY

ALERT

ADM1023–SPECIFICATIONS

(TA = T

MIN

1

to T

, VDD = 3.0 V to 3.6 V, unless otherwise noted)

MAX

Parameter Min Typ Max Unit Test Conditions/Comments

POWER SUPPLY AND ADC

Temperature Resolution, Local Sensor 1 °C Guaranteed No Missed Codes
Temperature Resolution, Remote Sensor 0.125 °C Guaranteed No Missed Codes
Temperature Error, Local Sensor –1.5 ± 0.5 +1.5 °CT

–3 ±1+3 °CT

Temperature Error, Remote Sensor –1 +1 °CT

–3 +3 °CT

Relative Accuracy 0.25 °CT

= 60°C to 100°C

A

= 0°C to 120°C

A

, TD = 60°C to 100°C (Note 2)

A

, TD = 0°C to 120°C (Note 2)

A

= 60°C to 100°C

A

Supply Voltage Range 3 3.6 V Note 3
Undervoltage Lockout Threshold 2.55 2.7 2.8 V V

Input, Disables ADC, Rising Edge

DD

Undervoltage Lockout Hysteresis 25 mV
Power-On Reset Threshold 0.9 1.7 2.2 V V

, Falling Edge (Note 4)

DD

POR Threshold Hysteresis 50 mV
Standby Supply Current 1 5 µAV

= 3.3 V, No SMBus Activity

DD

4 µA SCLK at 10 kHz
Average Operating Supply Current 130 200 µA 0.25 Conversions/Sec Rate
Autoconvert Mode, Averaged Over 4 Sec 225 330 µA 2 Conversions/Sec Rate
Conversion Time 65 115 170 ms From Stop Bit to Conversion

Complete (Both Channels)
D+ Forced to D– + 0.65 V

Remote Sensor Source Current 120 205 300 µA High Level (Note 4)

71216 µA Low Level (Note 4)

D-Source Voltage 0.7 V
Address Pin Bias Current (ADD0, ADD1) 50 µA Momentary at Power-On Reset

SMBus INTERFACE

Logic Input High Voltage, V

IH

2.2 V VDD = 3 V to 5.5 V

STBY, SCLK, SDATA

Logic Input Low Voltage, V

IL

0.8 V VDD = 3 V to 5.5 V

STBY, SCLK, SDATA

SMBus Output Low Sink Current 6 mA SDATA Forced to 0.6 V
ALERT Output Low Sink Current 1 mA ALERT Forced to 0.4 V
Logic Input Current, I

, I

IH

IL

–1 +1 µA

SMBus Input Capacitance, SCLK, SDATA 5 pF
SMBus Clock Frequency 100 kHz
SMBus Clock Low Time, t
SMBus Clock High Time, t
SMBus Start Condition Setup Time, t
SMBus Start Condition Hold Time, t

LOW

HIGH

SU:STA

HD:STA

4.7 µst
4nst

4.7 ns
4 ns Time from 10% of SDATA to 90%

Between 10% Points

LOW

Between 90% Points

HIGH

of SCLK

SMBus Stop Condition Setup Time, t

SU:STO

4 ns Time from 90% of SCLK to 10%

of SDATA
SMBus Data Valid to SCLK 250 ns Time for 10% or 90% of
Rising Edge Time, t

SU:DAT

SMBus Data Hold Time, t
SMBus Bus Free Time, t

BUF

HD:DAT

0 µs

4.7 µs Between Start/Stop Condition

SDATA to 10% of SCLK

SCLK Falling Edge to SDATA 1 µs Master Clocking in Data

Valid Time, t

SMBus Leakage Current 5 µAV

NOTES

1

T

= 120°C, T

MAX

2

TD is temperature of remote thermal diode; TA, TD = 60°C to 100°C.

3

Operation at VDD = 5 V guaranteed by design, not production tested.

4

Guaranteed by design, not production tested.

Specifications subject to change without notice.

MIN

VD,DAT

= 0°C

= 0 V

DD

.

–2–

REV. B

ADM1023

TOP VIEW

(Not to Scale)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

GND

V

DD

NC

ALERT

D+

D–

ADM1023

NC

GND

ADD1

NC

NC

ADD0

SDATA

NC

SCLK

STBY

NC = NO CONNECT

ABSOLUTE MAXIMUM RATINGS*

Positive Supply Voltage (VDD) to GND . . . . . . –0.3 V to +6 V

D+, ADD0, ADD1 . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

DD

D– to GND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.6 V

SCLK, SDATA, ALERT, STBY . . . . . . . . . . . –0.3 V to +6 V

Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA

Input Current, D– . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 1 mA

ESD Rating, all pins (Human Body Model) . . . . . . . . 2000 V

Continuous Power Dissipation

Up to 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW

Derating Above 70°C . . . . . . . . . . . . . . . . . . . . . 6.7 mW/°C

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

Maximum Junction Temperature (T

max) . . . . . . . . . . 150°C

J

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . 300°C

IR Reflow Peak Temperature . . . . . . . . . . . . . . . . . . . . . 220°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

THERMAL CHARACTERISTICS

16-Lead QSOP Package

= 105°C/W

θ

JA

θ

= 39°C/W

JC

ORDERING GUIDE

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Description

1, 5, 9, NC No Connect.
13, 16

2V

DD

Positive supply, 3 V to 5.5 V.

3 D+ Positive connection to remote tem-

perature sensor.

4 D– Negative connection to remote tem-

perature sensor.

6 ADD1 Three-state logic input, higher bit of

device address.
7, 8 GND Supply 0 V connection.
10 ADD0 Three-state logic input, lower bit of

device address.
11 ALERT Open-drain logic output used as

interrupt or SMBus alert.
12 SDATA Logic input/output, SMBus serial

data. Open-drain output.
14 SCLK Logic input, SMBus serial clock.
15 STBY Logic input selecting normal opera-

tion (high) or standby mode (low).

PIN CONFIGURATION

Temperature Package Package

Model Range Description Option

ADM1023ARQ 0°C to 120°C 16-Lead QSOP RQ-16

t

R

t

HD;DAT

t

HIGH

SCL

SDA

t

LOW

t

HD;STA

t

BUF

S

P

Figure 1. Diagram for Serial Bus Timing

t

F

t

SU;DAT

t

SU;STA

t

HD;STA

t

SU;STO

PS

REV. B

–3–

ADM1023

–Typical Performance Characteristics

20

15

10

5

0

–5

–10

–15

TEMPERATURE ERROR – ⴗC

–20

–25

–30

D+ TO GND

D+ TO V

DD

LEAKAGE RESISTANCE – M⍀

101

100

Figure 2. Temperature Error vs. Resistance from Track to

and GND

V

DD

5

4

250mV p-p REMOTE

3

2

TEMPERATURE ERROR – ⴗC

1

0

100

100mV p-p REMOTE

1k 10k 100k 1M 10M 100M

FREQUENCY – Hz

3

2

1

C

ⴗ

0

ERROR –

–1

–2

–3

50

60 70 80 90 110 120

UPPER SPEC LEVEL

LOWER SPEC LEVEL

TEMPERATURE –

100

ⴗ

C

Figure 5. Temperature Error of ADM1023 vs. Pentium III
Temperature

14

12

10

8

6

4

2

TEMPERATURE ERROR – ⴗC

0

–1

2

4 6 8 1012141618202224

CAPACITANCE – nF

Figure 3. Remote Temperature Error vs. Supply Noise
Frequency

9

8

7

6

5

4

3

TEMPERATURE ERROR – ⴗC

2

1

0

10 1k 10k

1

100 100k 1M

100mV p-p

50mV p-p

FREQUENCY – Hz

25mV p-p

10M 100M

Figure 4. Temperature Error vs. Common-Mode Noise
Frequency

Figure 6. Temperature Error vs. Capacitance Between D+
and D–

70

60

50

40

30

20

SUPPLY CURRENT – ␮A

10

0

1

5 10 25 50 75 100 1000250 500 750

SCLK FREQUENCY – kHz

VDD = 3.3V

VDD = 5V

Figure 7. Standby Supply Current vs. SCLK Frequency

–4–

REV. B