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MAX6678ATP90 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6678ATP90 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 19 page 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 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 2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller and Five GPIOs ________________________________________________________________ Maxim Integrated Products 1 20 19 18 17 16 13 12 11 14 15 GPIO3 GPIO2 GPIO1 OT PRESET0 4 3 2 1 PRESET4 GPIO4 SMBCLK SMBDATA 5 DXP1 678 9 10 MAX6678 *CONNECT EXPOSED PADDLE TO GND TOP VIEW 5mm x 5mm THIN QFN Pin Configurations Ordering Information 19-3306; Rev 0; 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. *EP = Exposed paddle. PART TEMP RANGE PIN- PACKAGE SMBus ADDRESS MAX6678AEP90 -40°C to +125°C 20 QSOP 1001000 MAX6678AEP92 -40°C to +125°C 20 QSOP 1001001 MAX6678AEP94 -40°C to +125°C 20 QSOP 1001010 MAX6678AEP96 -40°C to +125°C 20 QSOP 1001011 MAX6678ATP90 -40°C to +125°C 20 Thin QFN-EP* 1001000 MAX6678ATP92 -40°C to +125°C 20 Thin QFN-EP* 1001001 MAX6678ATP94 -40°C to +125°C 20 Thin QFN-EP* 1001010 MAX6678ATP96 -40°C to +125°C 20 Thin QFN-EP* 1001011 SMBus is a trademark of Intel Corp. Pin Configurations continued at end of data sheet. Typical Operating Circuit appears at end of data sheet. |
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