Rainbow-electronics MAX6696 Bedienungsanleitung PDF herunterladen

General Description

The MAX6695/MAX6696 are precise, dual-remote, and

local digital temperature sensors. They accurately mea-

sure the temperature of their own die and two remote

diode-connected transistors, and report the tempera-

ture in digital form on a 2-wire serial interface. The

remote diode is typically the emitter-base junction of a

common-collector PNP on a CPU, FPGA, GPU, or ASIC.

The 2-wire serial interface accepts standard system

management bus (SMBus™) commands such as Write

Byte, Read Byte, Send Byte, and Receive Byte to read

the temperature data and program the alarm thresholds

and conversion rate. The MAX6695/MAX6696 can func-

tion autonomously with a programmable conversion

rate, which allows control of supply current and temper-

ature update rate to match system needs. For conver-

sion rates of 2Hz or less, the temperature is

represented as 10 bits + sign with a resolution of

+0.125°C. When the conversion rate is 4Hz, output data

is 7 bits + sign with a resolution of +1°C. The MAX6695/

MAX6696 also include an SMBus timeout feature to

enhance system reliability.

Remote temperature sensing accuracy is ±1.5°C be-

tween +60°C and +100°C with no calibration needed.

The MAX6695/MAX6696 measure temperatures from

-40°C to +125°C. In addition to the SMBus ALERT out-

put, the MAX6695/MAX6696 feature two overtempera-

ture limit indicators (OT1 and OT2), which are active

only while the temperature is above the corresponding

programmable temperature limits. The OT1 and OT2

outputs are typically used for fan control, clock throt-

tling, or system shutdown.

The MAX6695 has a fixed SMBus address. The

MAX6696 has nine different pin-selectable SMBus

addresses. The MAX6695 is available in a 10-pin

µMAX

and the MAX6696 is available in a 16-pin QSOP

package. Both operate throughout the -40°C to +125°C

temperature range.

Applications

Notebook Computers

Desktop Computers

Servers

Workstations

Test and Measurement Equipment

Features

♦ Measure One Local and Two Remote

Temperatures

♦ 11-Bit, 0.125°C Resolution

♦ High Accuracy ±1.5°C (max) from +60°C to +100°C

(Remote)

♦ ACPI Compliant

♦ Programmable Under/Overtemperature Alarms

♦ Programmable Conversion Rate

♦ Three Alarm Outputs: ALERT, OT1, and OT2

♦ SMBus/I

C™-Compatible Interface

MAX6695/MAX6696

Dual Remote/Local Temperature Sensors with

SMBus Serial Interface

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

Typical Operating Circuit

19-3183; Rev 1; 5/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX6695AUB

-40°C to +125°C

10 µMAX

MAX6696AEE

-40°C to +125°C

16 QSOP

SMBus is a trademark of Intel Corp.

Pin Configurations appear at end of data sheet.

CLOCK

DATA

TO SYSTEM

SHUTDOWN

GND

OT2

SMBCLK

OT1

SMBDATA

INTERRUPT

TO µP

0.1µF

DXN

DXP1

47Ω

10kΩ

EACH

ALERT

+3.3V

MAX6695

CPU

TO CLOCK

THROTTLING

DXP2

GRAPHICS

PROCESSOR

Typical Operating Circuits continued at end of data sheet.

C is a trademark of Philips Corp. Purchase of I

C components

from Maxim Integrated Products, Inc., or one of its sublicensed

Associated Companies, conveys a license under the Philips

C Patent Rights to use these components in an I

C system,

provided that the system conforms to the I

C Standard

Specification as defined by Philips.

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

1 2 3 4 5 6 ... 19 20

Inhaltsverzeichnis

Seite 1 - SMBus Serial Interface

General DescriptionThe MAX6695/MAX6696 are precise, dual-remote, andlocal digital temperature sensors. They accurately mea-sure the temperature of the

Seite 2

MAX6695/MAX6696extended temperature register (11h) (Table 3), whichextends the temperature data to 10 bits + sign and theresolution to +0.125°C per LS

Seite 3

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface_______________________________________________________________________

Seite 4

MAX6695/MAX6696The POR state of both internal and external ALERT low-temperature limit registers is 1100 1001 or -55°C. Usebit 3 of the configuration

Seite 5

begun, after which the device returns to standby mode.If a conversion is in progress when a one-shot com-mand is received, the command is ignored. If

Seite 6

MAX6695/MAX6696Reset (MAX6696 Only)The MAX6696’s registers are reset to their power-onvalues if RESET is driven high. When reset occurs, allregisters

Seite 7

byte’s POR state is 06h (4Hz). The MAX6695/MAX6696use only the 3 LSBs of the control register. The 5 MSBsare don’t care and should be set to zero. The

Seite 8

MAX6695/MAX6696PC Board LayoutFollow these guidelines to reduce the measurementerror when measuring remote temperature:1) Place the MAX6695/MAX6696 as

Seite 9

Leakage currents from PC board contaminationmust be dealt with carefully since a 20MΩ leakagepath from DXP to ground causes about +1°C error.If high-v

Seite 10

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface18 ____________________________________________________________________

Seite 11

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface_______________________________________________________________________

Seite 12

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface2 _____________________________________________________________________

Seite 13

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial InterfaceMaxim cannot assume responsibility for use of any circuitry other than

Seite 14

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface_______________________________________________________________________

Seite 15

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface4 _____________________________________________________________________

Seite 16

MAX6695/MAX6696Dual Remote/Local Temperature Sensors withSMBus Serial Interface_______________________________________________________________________

Seite 17

MAX6695/MAX6696Detailed DescriptionThe MAX6695/MAX6696 are temperature sensorsdesigned to work in conjunction with a microprocessoror other intelligen

Seite 18

and 100µA, the change in the measured voltage due toseries resistance is:Since 1°C corresponds to 198.6µV, series resistancecontributes a temperature

Seite 19

MAX6695/MAX6696In this example, the effect of the series resistance andthe ideality factor partially cancel each other.Discrete Remote DiodesWhen the

Seite 20

uration byte register. Hardware and software standbysare very similar; all data is retained in memory, and theSMBus interface is alive and listening f

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Inhaltsverzeichnis

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