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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6678 Datasheet

2-Channel Temperature Monitor

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MAX6678 pdf
19-3306; Rev 0; 5/04
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2-Channel Temperature Monitor with Dual Automatic
PWM Fan-Speed Controller and Five GPIOs
General Description
The MAX6678 monitors its own temperature and the
temperatures of two external diode-connected transis-
tors, which typically reside on the die of a CPU or other
integrated circuit. The device reports temperature values
in digital form using a 2-wire serial interface. The
MAX6678 provides a programmable alarm output to gen-
erate interrupts, throttle signals, or overtemperature shut-
down signals.
The 2-wire serial interface accepts standard System
Management Bus (SMBus)write byte, read byte, send
byte, and receive byte commands to read the tempera-
ture data and program the alarm thresholds. The tem-
perature data controls a PWM output signal to adjust
the speed of a cooling fan, thereby minimizing noise
when the system is running cool, but providing maxi-
mum cooling when power dissipation increases.
Five GPIO pins provide additional flexibility. The GPIO
power-up states are set by connecting the GPIO preset
inputs to ground or VCC.
The MAX6678 is available in a 20-pin QSOP package
and a 5mm x 5mm thin QFN package. It operates from
3.0V to 5.5V and consumes just 500µA of supply current.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
Networking Equipment
SMBus is a trademark of Intel Corp.
Pin Configurations
TOP VIEW
20 19 18 17 16
SMBDATA 1
SMBCLK 2
GPIO4 3
PRESET4 4
DXP1 5
MAX6678
*CONNECT EXPOSED
PADDLE TO GND
15 OT
14 GPIO1
13 GPIO2
12 GPIO3
11 PRESET0
6 7 8 9 10
Features
Two Thermal-Diode Inputs
Local Temperature Sensor
Five GPIO Input/Outputs
Two PWM Outputs for Fan Drive (Open Drain; May
Be Pulled Up to +5V)
Programmable Fan-Control Characteristics
Automatic Fan Spin-Up Ensures Fan Start
Controlled Rate of Change Ensures Unobtrusive
Fan-Speed Adjustments
1°C Remote Temperature Accuracy (+60°C to
+145°C)
Temperature Monitoring Begins at POR for Fail-
Safe System Protection
OT Output for Throttling or Shutdown
Four Versions Available, Each with a Different
Address
5mm x 5mm TQFN Package
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
MAX6678AEP90
MAX6678AEP92
MAX6678AEP94
MAX6678AEP96
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
20 QSOP
20 QSOP
20 QSOP
20 QSOP
MAX6678ATP90 -40°C to +125°C 20 Thin
QFN-EP*
MAX6678ATP92 -40°C to +125°C 20 Thin
QFN-EP*
MAX6678ATP94 -40°C to +125°C 20 Thin
QFN-EP*
MAX6678ATP96
-40°C to +125°C
20 Thin
QFN-EP*
*EP = Exposed paddle.
SMBus
ADDRESS
1001000
1001001
1001010
1001011
1001000
1001001
1001010
1001011
5mm x 5mm THIN QFN
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6678 Datasheet

2-Channel Temperature Monitor

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MAX6678 pdf
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2-Channel Temperature Monitor with Dual Automatic
PWM Fan-Speed Controller and Five GPIOs
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V
OT, SMBDATA, SMBCLK, PWMOUT_,
GPIO_ to GND ......................................................-0.3V to +6V
DXP_ to GND ..........................................-0.3V to + (VCC + 0.3V)
DXN to GND ..........................................................-0.3V to +0.8V
PRESET_ to GND ....................................-0.3V to + (VCC + 0.3V)
SMBDATA, OT, PWMOUT_ Current....................-1mA to +50mA
DXN Current .......................................................................±1mA
ESD Protection (all pins, Human Body Model) ..................2000V
Continuous Power Dissipation (TA = +70°C)
20-Pin QSOP (derate 9.1mW/°C above +70°C).......... 727mW
20-Pin TQFN (derate 34.5mW/°C above +70°C) .......2759mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Operating Supply Voltage Range
Operating Current
VCC
IS Interface inactive, ADC active
+3.0
+5.5
0.5 1
+25°C TR +125°C,
TA = 60°C
±1
External Temperature Error,
VCC = 3.3V
VCC = 3.3V
0°C TR +145°C,
+25°C TA +100°C
±3
0°C TR +145°C,
0°C TA +125°C
±4
Internal Temperature Error
Temperature Resolution
VCC = +3.3V
+25°C TR +100°C
0°C TA +125°C
1
8
±2.5
±4
Conversion Time
200 250 300
PWM Frequency Tolerance
(Note 1)
-20 +20
Remote-Diode Sourcing Current
High level
Low level
80 100 120
8 10 12
DXN Source Voltage
0.7
DIGITAL INPUTS AND OUTPUTS
UNITS
V
mA
°C
°C
°C
Bits
ms
%
µA
V
Output Low Voltage (Sink Current)
(OT, GPIO_, SMBDATA, PWMOUT_)
VOL IOUT = 6mA
0.4 V
Output High Leakage Current
(OT, GPIO_, SMBDATA, PWMOUT_)
Logic-Low Input Voltage (SMBDATA,
SMBCLK, PRESET_, GPIO_)
Logic-High Input Voltage (SMBDATA,
SMBCLK, PRESET_, GPIO_)
Input Leakage Current
Input Capacitance
SMBus TIMING
Serial Clock Frequency
IOH
VIL VCC = 3V to 3.6V
VCC = 3.6V to 5.5V
VIH VCC = 3V to 3.6V
VCC = 3.6V to 5.5V
CIN
fSCLK
1 µA
0.8
V
0.8
2.1
V
2.1
1 µA
5 pF
100 kHz
2 _______________________________________________________________________________________


Part Number MAX6678
Description 2-Channel Temperature Monitor
Maker Maxim Integrated Products
Total Page 19 Pages
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