Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - temperature management Internal, External I²C/SMBus TQFN 16 (5x5)

General Description

The MAX6639 monitors its own temperature and one

external diode-connected transistor or the temperatures

of two external diode-connected transistors, typically

available in CPUs, FPGAs, or GPUs. 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 pro-

gram the alarm thresholds. Temperature data can be

read at any time over the SMBus, and three program-

mable alarm outputs can be used to generate inter-

rupts, throttle signals, or overtemperature shutdown

signals.

The temperature data is also used by the internal dual-

PWM fan-speed controller to adjust the speed of up to

two cooling fans, thereby minimizing noise when the

system is running cool, but providing maximum cooling

when power dissipation increases. Speed control is

accomplished by tachometer feedback from the fan, so

that the speed of the fan is controlled, not just the PWM

duty cycle. Accuracy of speed measurement is ±4%.

The MAX6639 is available in 16-pin QSOP and 16-pin thin

QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V

and consumes just 500µA of supply current.

Applications

Desktop Computers

Notebook Computers

Projectors

Servers

Networking Equipment

Features

o Two Thermal-Diode Inputs

o Up to 25kHz PWM Output Frequency

o Three Selectable SMBus Addresses

o Local Temperature Sensor

o 1°C Remote Temperature Accuracy

o Two PWM Outputs for Fan Drive (Open Drain; Can

be Pulled Up to +13.5V)

o Programmable Fan-Control Characteristics

o Automatic Fan Spin-Up Ensures Fan Start

o Controlled Rate-of-Change Ensures Unobtrusive

Fan-Speed Adjustments

o ±3% Fan-Speed Measurement Accuracy

o Temperature Monitoring Begins at POR for Fail-

Safe System Protection

o OT and THERM Outputs for Throttling or Shutdown

o Measures Temperatures Up to +150°C

o MAX6639F is Optimized for n = 1.021 for Penryn

Compatibility

2-Channel Temperature Monitor with Dual,

Automatic, PWM Fan-Speed Controller

MAX6639/MAX6639F

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

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

EVALUATION KIT AVAILABLE

Ordering Information

19-3682; Rev 3; 4/13

PART

O PER A T IN G

RANGE

M EA SU R EM EN T

RANGE

PIN-

PACKAGE

M A X6 6 3 9 A E E +

-40°C to

+125°C

0°C to +150°C 16 QSOP

MAX6639ATE+

-40°C to

+125°C

0°C to +150°C 16 TQFN - E P *

M AX6 639FAEE+

-40°C to

+125°C

0°C to +150°C 16 QSOP

MAX6639FATE +

-40°C to

+125°C

0°C to +150°C 16 TQFN- E P *

PWM1

SCL

SDA

ADD

DXP2

DXN

GND

DXP1

TOP VIEW

MAX6639

QSOP

TACH1

PWM2

TACH2

FANFAIL

THERM

ALERT

MAX6639

*CONNECT EXPOSED

PAD TO GND.

GND

DXP1

PWM1

SDA

SCL

TACH1

PWM2

TACH2

FANFAIL

THERM

ADD

DXP2

DXN

ALERT

12 4

12 11 9

Pin Configurations

Typical Application Circuit appears at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

Summary of content (22 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller General Description The MAX6639 monitors its own temperature and one external diode-connected transistor or the temperatures of two external diode-connected transistors, typically available in CPUs, FPGAs, or GPUs.
PAGE 2
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +4V PWM1, PWM2, TACH1, and TACH2 to GND ......-0.3V to +13.5V DXP1 and DXP2 to GND ..........................-0.3V to +(VCC + 0.3V) DXN to GND ..........................................................-0.3V to +0.8V SCL, SDA, THERM, OT, FANFAIL, ADD, and ALERT to GND ...........................................
PAGE 3
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +85°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS AND OUTPUTS ALERT, FANFAIL, THERM, OT, SDA ISINK = 6mA 0.4 PWM1, PWM2, ISINK = 4mA 0.
PAGE 4
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Typical Operating Characteristics (VCC = 3.3V, TA = +25°C.) 700 SUPPLY CURRENT (μA) 8 7 6 5 4 3 2 2 TEMPERATURE ERROR (°C) 9 MAX6639 toc02 800 MAX6639 toc01 10 600 500 400 1 0 -1 300 1 FAIRCHILD 2N3906 0 200 3.5 4.0 4.5 5.0 5.5 5.5 0 TEMPERATURE ERROR (°C) 1.5 -1.0 VIN = 250mVP-P SQUARE WAVE APPLIED TO VCC WITH NO BYPASS CAPACITOR 2.0 50 75 100 1.0 0.5 0 -0.5 -1.0 -1.
PAGE 5
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C.) PWMOUT FREQUENCY vs. DIE TEMPERATURE PWMOUT FREQUENCY vs. SUPPLY VOLTAGE 34 33 32 31 MAX6639 toc11 MAX6639 toc10 35 PWMOUT FREQUENCY (Hz) PWMOUT FREQUENCY (Hz) 35 34 33 32 31 30 30 -40 -15 10 35 60 85 110 3.0 3.5 TEMPERATURE (°C) 4.0 4.5 5.0 5.
PAGE 6
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Detailed Description Block Diagram The MAX6639 monitors its own temperature and a remote-diode-connected transistor or the temperatures of two external-diode-connected transistors, which typically reside on the die of a CPU or other integrated circuit.
PAGE 7
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller A B tLOW C D E F G H tHIGH I J K L M SCL SDA tSU:STA tHD:STA tSU:STO tSU:DAT A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW F = ACKNOWLEDGE BIT CLOCKED INTO MASTER G = MSB OF DATA CLOCKED INTO SLAVE H = LSB OF DATA CLOCKED INTO SLAVE tBUF I = MASTER PULLS DATA LINE LOW J = ACKNOWLED
PAGE 8
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 2. Temperature Data Byte Format TEMP (°C) TEMP (°C) DIGITAL OUTPUT 241 +241 1111 0001 240 +240 1111 0000 126 +126 0111 1110 25 +25 0001 1001 1.50 1 0000 0001 0.00 0 0000 0000 The MAX6639 employs a register lock mechanism to avoid getting temperature results from the temperature register and the extended temperature register sampled at two different time points.
PAGE 9
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller written to the duty-cycle registers (26h and 27h). In this mode, the MAX6639 signals a fan fault when the tachometer count is greater than the maximum tachometer count value stored in the appropriate register (22h and 23h). After the MAX6639 asserts FANFAIL, the fan with a tachometer fault goes to full speed for 2s in an attempt to restart the fan and then returns to the original duty-cycle settings.
PAGE 10
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller RPM TACH 0xFFh TMIN-5 TMIN TB TEMPERATURE RPMMAX TACHB+1 TACHMAX TACHA+1 TACHA+1 TACHB+1 TACHMIN RPMMIN TEMPERATURE 0 TMIN-5 Figure 4. Tachometer Target Calculation are 30h to 60h. Set the value to correspond to the fullrated RPM of the fan. See Figure 4. Figure 5 shows how the MAX6639 calculates the target tachometer value based on the measured temperature.
PAGE 11
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 4. Register Map READ/ WRITE REGISTER POR NO.
PAGE 12
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 4. Register Map (continued) READ/ WRITE 12 REGISTER POR NO.
PAGE 13
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 4. Register Map (continued) READ/ WRITE REGISTER POR NO.
PAGE 14
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 5. Fan Duty-Cycle Rate-of-Change ACTUAL RATE OF CHANGE AT SPECIFIC PWM FREQUENCIES REGISTER 10h OR 14h D[6:4] NOMINAL RATE OF CHANGE (s) 100Hz (s) 50Hz (s) 33.3Hz (s) 20Hz (s) NOMINAL TIME FROM 33% TO 100% (s) 000 0 0 0 0 0 0 001 0.0625 0.06 0.06 0.06 0.05 5 010 0.125 0.13 0.12 0.12 0.15 10 011 0.25 0.25 0.26 0.24 0.25 20 100 0.5 0.5 0.5 0.51 0.5 40 101 1 1 1 0.
PAGE 15
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 8. Temperature Step Size Table 9. Fan PWM Frequency REGISTER 11h OR 15h FAN CONTROL TEMPERATURE STEP SIZE (°C) 00 1 01 2 00 20 5 10 4 01 33.33 8.33 11 8 10 50 12.5 11 100 25 Fan 1 and 2 Configuration 2a (11h and 15h) The following registers apply to the automatic RPM control mode: • D[7:4]: Fan RPM (Tachometer) Step-Size A.
PAGE 16
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 10. Tachometer Pulses per Revolution REGISTERS 24h OR 25h D[7:6] TACHOMETER PULSES PER REVOLUTION 00 1 01 2 10 3 11 4 Fan 1 and 2 Pulses and Min RPM (24h and 25h) D[7:6]: This sets the number of tachometer pulses per revolution for the fan. When set properly, a 2000RPM fan with two pulses per revolution has the same tachometer count as a 2000RPM fan with four pulses per revolution.
PAGE 17
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller VCC VCC VFAN (12V OR 5V) 3V TO 5.5V 4.7kΩ 4.7kΩ PWM1 PWM1 3V TO 5.5V 3V TO 5.5V VFAN (5V OR 12V) 5V 4.7kΩ 4.7kΩ TACH1 TACH1 TACH OUTPUT TACH OUTPUT Figure 8. High-Side PWM Drive with “Keep-Alive” Supply Linear Fan Supply Drive VFAN (5V OR 12V) VCC 100kΩ 3.3V 4.7kΩ 2N3904 100kΩ PWM1 33kΩ 3V TO 5V 2.2μF 9.1kΩ 4.7kΩ TACH1 TACH OUTPUT 10μF TACH OUTPUT Figure 9.
PAGE 18
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Table 11.
PAGE 19
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Effect of Series Resistance ADC Noise Filtering Series resistance in a sense diode contributes additional errors. For nominal diode currents of 10µA and 100µA, change in the measured voltage is: ΔVM = RS (100µA - 10µA) = 90µA x RS Since 1°C corresponds to 198.6µV, series resistance contributes a temperature offset of: μV 90 °C Ω = 0.453 μV Ω 198.
PAGE 20
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Typical Operating Circuit 5V VFAN (5V OR 12V) 3.0V TO 3.6V 5V CPU DXP1 VCC ADD DXN VFAN (5V OR 12V) TACH1 PWM1 5V DXP2 PWM2 3.3V TO 5.5V MAX6639 GPU TO SMBus MASTER SDA SCL TACH2 3.3V TO 5.5V 3.3V TO 5.5V ALERT TO CLOCK THROTTLE TO SYSTEM SHUTDOWN OT 3.3V TO 5.5V 3.3V TO 5.
PAGE 21
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 22
MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller Revision History REVISION REVISION NUMBER DATE DESCRIPTION PAGES CHANGED 0 5/05 Initial release — 1 12/07 Changed max operating voltage range from 5.5V to 3.6V; corrected TOCs 1, 2, and 11; various style edits; and updated package outlines. 1–5, 7, 19, 20, 21, 22 2 4/08 Added MAX6639F option.