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Part: MAX6647MUA
Category:
Automotive
-> Sensor Interface
Description: +145 Precision Smbus-compatible Remote/ Local Sensors With Overtemperature Alarms
Company: Maxim Integrated Products
Datasheet: Download MAX6647MUA datasheet File size : 770 kB
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Datasheet text preview:
19-2540; Rev 1; 7/03
+145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms
General Description
T h e MAX6646/MAX6647/MAX6649 are precise, twochannel digital temperature sensors. The devices accurately measure the temperature of their own die and a remote PN junction, and report the temperature in digital form using a 2-wire serial interface. The remote PN junction is typically the emitter-base junction of a commoncollector PNP on a CPU, FPGA, or ASIC. 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 to program the alarm thresholds. To enhance s y s t e m reliability, the MAX6646/MAX6647/MAX6649 include an SMBus timeout. A fault queue prevents the ALERT and OVERT outputs from setting until a fault has been detected one, two, or three consecutive times (programmable). The MAX6646/MAX6647/MAX6649 provide two system alarms: ALERT and OVERT. ALERT asserts when any of four temperature conditions are violated: local overtemperature, remote overtemperature, local undertemperature, or remote undertemperature. OVERT asserts when the temperature rises above the value in either of the two OVERT limit registers. The OVERT output can be used to activate a cooling fan, or to trigger a system shutdown. Measurements can be done autonomously, at the programmed conversion rate, or in a single-shot mode. The adjustable conversion rate allows optimizing supply current and temperature update rate to match system needs. Remote accuracy is ±1°C maximum error between +60°C a n d +145°C with no calibration needed. The MAX6646/MAX6647/MAX6649 operate from -55°C to +125°C, and measure temperatures between 0°C and +145°C. The MAX6646/MAX6647/MAX6649 are available in an 8-pin µMAX package.
Features
o Dual Channel: Measures Remote and Local Temperature o 0.125°C Resolution o High Accuracy ±1°C (max) from +60°C to +145°C (Remote), and ±2°C (max) from +60°C to +100°C (Local) o Measures High-Ideality Thermal Diodes Up to +170°C (Apparent) +145°C (Real) o Two Alarm Outputs: ALERT and OVERT o Programmable Under/Overtemperature Alarm Temperature Thresholds o Programmable Conversion Rate o SMBus-Compatible Interface o SMBus Timeout
MAX6646/MAX6647/MAX6649
Ordering Information
PART TEMP RANGE PINMEASURED PACKAGE TEMP RANGE 0°C to +145°C 0°C to +145°C 0°C to +145°C
MAX6646MUA -55°C to +125°C 8 µMAX MAX6647MUA -55°C to +125°C 8 µMAX MAX6649MUA -55°C to +125°C 8 µMAX
Typical Operating Circuit
3.3V 0.1µF 200
Applications
Graphics Processors Desktop Computers Notebook Computers Servers Thin Clients Workstations Test and Measurement Multichip Modules
µP
VCC MAX6646 SDA MAX6647 MAX6649 SCLK ALERT OVERT GND
10k EACH DATA CLOCK INTERRUPT TO µP TO FAN DRIVER OR SYSTEM SHUTDOWN
DXP
2200pF
DXN
Selector Guide, Pin Configurations, and Functional Diagram appear 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.
+145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms MAX6646/MAX6647/MAX6649
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND VCC .........-0.3V to +6V DXP....-0.3V to (VCC + 0.3V) DXN .....-0.3V to +0.8V SCLK, SDA, ALERT, OVERT....-0.3V to +6V SDA, ALERT, OVERT Current .....-1mA to +50mA DXN Current .....±1mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 5.9mW/°C above +70°C) ....471mW ESD Protection (all pins, Human Body Model) .......±2000V Junction Temperature ......+150°C Operating Temperature Range .......-55°C to +125°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 = -55°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +100°C.) (Note 1)
PARAMETER Supply Voltage Temperature Resolution VCC = 3.3V, TA = +100°C, TRJ = +60°C to +145°C Remote Temperature Error VCC = 3.3V, TA = +60°C to +100°C, TRJ = +25°C to +145°C VCC = 3.3V, TA = +0°C to +100°C, TRJ = +0°C to +145°C Local Temperature Error Supply Sensitivity of Temperature Error Undervoltage Lockout (UVLO) Threshold UVLO Hysteresis Power-On-Reset (POR) Threshold POR Threshold Hysteresis Standby Supply Current Operating Current Average Operating Current Conversion Time Conversion Time Error DXP and DXN Leakage Current Remote-Diode Source Current IRJ Standby mode High level Low level 80 8 100 10 tCONV SMBus static During conversion 0.25 conversions per second 2 conversions per second From stop bit to conversion completion 95 -25 40 250 125 VCC falling edge UVLO Falling edge of VCC disables ADC 2.4 VCC = 3.3V TA = +60°C to +100°C TA = 0°C to +125°C SYMBOL VCC CONDITIONS MIN 3.0 0.125 11 -1.0 -1.6 -3.2 -2.0 -3.0 ±0.2 2.7 90 2.0 90 3 12 0.08 80 400 156 +25 100 120 12 2.95 +1.0 +1.6 +3.2 +2.0 +3.0 °C °C/V V mV V mV µA mA µA ms % nA µA °C TYP MAX 5.5 UNITS V °C Bits
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+145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.0V to 5.5V, TA = -55°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +100°C.) (Note 1)
PARAMETER ALERT, OVERT Output Low Voltage Output High Leakage Current Logic Input Low Voltage Logic Input High Voltage Input Leakage Current Output Low-Sink Current Input Capacitance Serial Clock Frequency Bus Free Time Between STOP and START Condition START Condition Setup Time Repeat START Condition Setup Time START Condition Hold Time STOP Condition Setup Time Clock Low Period Clock High Period Data Setup Time Receive SCLK/SDA Rise Time Receive SCLK/SDA Fall Time Pulse Width of Spike Suppressed SMBus Timeout tS U : S T A tH D : S T A tS U : S T O tL O W tH I G H t HD:DAT tR tF tSP tT I M E O U T SDA low period for interface reset 0 25 37 90% to 90% 10% of SDA to 90% of SCLK 90% of SCLK to 90% of SDA 10% to 10% 90% to 90% (Note 4) VIL VIH IL E A K IS I N K CIN fS C L K tBUF (Note 3) 4.7 4.7 50 4 4 4.7 4 250 1 300 50 45 VCC = 3.0V VCC = 5.5V VIN = GND or VCC VOL = 0.6V 2.2 2.6 -1 6 5 100 +1 ISINK = 1mA ISINK = 4mA VOH = 5.5V 0.4 0.6 1 0.8 V µA V V µA mA pF kHz µs µs ns µs µs µs µs µs µs ns ns ms SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6646/MAX6647/MAX6649
SMBus-COMPATIBLE INTERFACE (SCLK AND SDA)
SMBus-COMPATIBLE TIMING (Note 2)
Note 1: Note 2: Note 3: Note 4:
All parameters tested at a single temperature. Specifications over temperature are guaranteed by design. Timing specifications guaranteed by design. The serial interface resets when SCLK is low for more than tTIMEOUT. A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCLK's falling edge.
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