Rainbow-electronics MAX6616 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The MAX6615/MAX6616 monitor two temperature chan-

nels, either the internal die temperature and the temper-

ature of an external thermistor, or the temperatures of

two external thermistors. The temperature data controls

a PWM output signal to adjust the speed of a cooling

fan, thereby minimizing noise when the system is run-

ning cool, but providing maximum cooling when power

dissipation increases. The fans’ tachometer output sig-

nals are monitored by the MAX6615/MAX6616 to detect

fan failure. If a fan failure is detected, the FAN_FAIL

output is asserted.

The 2-wire serial interface accepts standard system

management bus (SMBus

) write byte, read byte,

send byte, and receive byte commands to read the

temperature data and program the alarm thresholds.

The programmable alarm output can be used to gener-

ate interrupts, throttle signals, or overtemperature shut-

down signals.

The MAX6616 features six GPIOs to provide additional

flexibility. All of the GPIOs power-up as inputs, with the

exception of GPIO0, which powers up as either an input

or an output as determined by connecting the PRESET

pin to ground or V

The MAX6616 is available in a 24-pin QSOP package,

while the MAX6615 is available in a 16-pin QSOP pack-

age. Both devices operate from a single-supply voltage

range of 3.0V to 5.5V, have operating temperature

ranges of -40°C to +125°C, and consume just 500µA of

supply current.

Applications

Desktop Computers

Servers

Power Supplies

Networking Equipment

Workstations

Features

♦ Two Thermistor Inputs

♦ Two Open-Drain PWM Outputs for Fan-Speed

Control

♦ Local Temperature Sensor

♦ Six GPIOs (MAX6616)

♦ Programmable Fan-Control Characteristics

♦ Controlled PWM Rate-of-Change Ensures

Unobtrusive Fan-Speed Adjustments

♦ Fail-Safe System Protection

♦ OT Output for Throttling or Shutdown

♦ Nine Different Pin-Programmable SMBus

Addresses

♦ 16-Pin and 24-Pin QSOP Packages

MAX6615/MAX6616

Dual-Channel Temperature Monitors and

Fan-Speed Controllers with Thermistor Inputs

________________________________________________________________ Maxim Integrated Products 1

19-3713; Rev 1; 7/05

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.

EVALUATION KIT

AVAILABLE

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX6615AEE -40°C to +125°C 16 QSOP

MAX6616AEG -40°C to +125°C 24 QSOP

SMBus is a trademark of Intel Corp.

Typical Application Circuits and Pin Configurations appear at

end of data sheet.

THERMISTORS

AND LOCAL

TEMP SENSOR

PWM

GENERATOR

AND TACH

COUNTER

SMBus

INTERFACE

AND

REGISTERS

LOGIC

ADD0 ADD1

*MAX6616 ONLY

FAN_FAIL

MAX6615

MAX6616

GND

SDA

SCL

REF

TH1

TH2

PWM1

PWM2

TACH1

TACH2

GPIO0*

GPIO5*

PRESET*

Functional Diagram

1 2 3 4 5 6 ... 19 20

MAX6615/MAX6616 1

Inhaltsverzeichnis

Seite 1 - MAX6615/MAX6616

General DescriptionThe MAX6615/MAX6616 monitor two temperature chan-nels, either the internal die temperature and the temper-ature of an external ther

Seite 2

MAX6615/MAX6616the duty cycle returns to either 0% or the fan-start dutycycle. The value of the hysteresis is set by D7 of thefan-configuration regist

Seite 3

GPIO Inputs/Outputs and Preset (MAX6616)The MAX6616 has six GPIO ports. GPIO0 has a PORcontrol pin (PRESET). When PRESET is connected toGND at POR, GP

Seite 4

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs12 __________________________________________________

Seite 5

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs_____________________________________________________

Seite 6

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs14 __________________________________________________

Seite 7

zero, the duty cycle is zero below the fan-start tempera-ture and has this value when the fan-start temperatureis reached. A value of 240 represents 1

Seite 8

MAX6615/MAX6616Duty-Cycle Step Size (13h)Bits D7–D4 (channel 1) and bits D3–D0 (channel 2) of theduty-cycle step-size register change the size of the

Seite 9

Applications InformationThermistor ConsiderationsNTC thermistors are resistive temperature sensorswhose resistance decreases with increasing tempera-t

Seite 10

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs18 __________________________________________________

Seite 11

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs_____________________________________________________

Seite 12

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs2 ___________________________________________________

Seite 13

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor InputsMaxim cannot assume responsibility for use of any cir

Seite 14

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs_____________________________________________________

Seite 15

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs4 ___________________________________________________

Seite 16

MAX6615/MAX6616Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs_____________________________________________________

Seite 17

MAX6615/MAX6616Detailed DescriptionThe MAX6615/MAX6616 accurately monitor two tem-perature channels, either the internal die temperatureand the temper

Seite 18

(POR) state. See Tables 3–7 for all other register functionsand the Register Descriptions section.Temperature MeasurementsThe averaging ADC integrates

Seite 19

MAX6615/MAX6616ture. The thermistor data in the temperature register(s)gives the voltage across REXTas a fraction of the refer-ence voltage. The LSB o

Seite 20

brushless DC motor has enough time to operate. Whendriving a fan with a PWM-to-DC circuit as shown inFigure 5, the highest available frequency (35kHz)

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