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Part: MAX6692MUA
Category:
Sensors
-> Temperature Sensors
Description: MAX6648, MAX6692 Precision Smbus-compatible Remote/local Temperature Sensors With Overtemperature Alarms
Company: Maxim Integrated Products
Datasheet: Download MAX6692MUA datasheet File size : 373 kB
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Datasheet text preview:
19-2545; Rev 1; 10/02
Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms
General Description
The MAX6648/MAX6692 are precise, two-channel digital temperature sensors. They 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 common-collector PNP on a CPU, FPGA, or ASIC. The 2-wire serial interface accepts standard System M a n a g e m e n t Bus (SMBus)TM write byte, read byte, send byte, and receive byte commands to read the temperature data and to program the alarm thresholds. To enhance system reliability, the MAX6648/MAX6692 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 MAX6648/MAX6692 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, with the conversion rate programmed by the user, or in a singleshot mode. The adjustable conversion rate allows the u s e r to optimize supply current and temperature update rate to match system needs. Remote accuracy is ±0.8°C maximum error between +25°C and +125°C with no calibration needed. The MAX6648/MAX6692 operate from -55°C to +125°C, and measure temperatures between 0°C and +125°C. The MAX6648 is available in an 8-pin µMAX package, and the MAX6692 is available in 8-pin µMAX and SO packages.
Features
o Dual Channel: Measures Remote and Local Temperature o 0.125°C Resolution o High Accuracy: ±0.8°C (max) from +25°C to +125°C (Remote), and ±2°C (max) from +60°C to +100°C (Local) o Two Alarm Outputs: ALERT and OVERT o Two Default OVERT Thresholds Available MAX6648: +110°C MAX6692: +85°C o Programmable Conversion Rate o SMBus-Compatible Interface o SMBus Timeout o Programmable Under/Overtemperature Alarm Thresholds
MAX6648/MAX6692
Ordering Information
PART TEMP RANGE PINMEASURED PACKAGE TEMP RANGE 0°C to +125°C 0°C to +125°C 0°C to +125°C
MAX6648MUA -55°C to +125°C 8 µMAX MAX6692MUA -55°C to +125°C 8 µMAX MAX6692MSA -55°C to +125°C 8 SO
Typical Operating Circuit
3.3V 0.1µF 200
Applications
Desktop Computers Notebook Computers Servers Thin Clients Workstations Test and Measurement Multichip Modules
µP 2200pF DXN VCC DXP
10k EACH SDA MAX6648 SCLK MAX6692 ALERT OVERT GND DATA CLOCK INTERRUPTED TO µP TO FAN DRIVER OR SYSTEM SHUTDOWN
SMBus is a trademark of Intel Corp.
Pin Configuration and Functional Diagram appear at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
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.
Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms MAX6648/MAX6692
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 8-Pin SO (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 = +85°C.) (Note 1)
PARAMETER Supply Voltage Temperature Resolution VCC = 3.3V, TA = +85°C Remote Temperature Error VCC = 3.3V, +60°C TA +100°C TRJ = +25°C to +125°C TRJ = +60°C to +100°C TRJ = 0°C to +125°C SYMBOL VCC CONDITIONS MIN 3.0 0.125 10 -0.8 -1.0 -1.6 -3.0 -2.0 -3.0 ±0.2 UVLO Falling edge of VCC disables ADC 2.4 2.7 90 VCC falling edge SMBus static During conversion 0.25 conversions per second 2 conversions per second tC O N V From stop bit to conversion completion Standby mode IRJ High level Low level 80 8 100 10 95 -25 2.0 90 3.5 0.45 40 250 125 12 0.8 80 400 156 +25 100 120 12 2.95 +0.8 +1.0 °C +1.6 +3.0 +2.0 +3.0 °C °C/V V mV V mV µA mA µA ms % nA µA TYP MAX 5.5 UNITS V °C Bits
VCC = 3.3V, +0°C TRJ = 0°C to +125°C TA +100°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 VCC = 3.3V TA = +60°C to +100°C TA = 0°C to +125°C
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Precision SMBus-Compatible Remote/Local Temperature 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 = +85°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 tHD:STA tSU:STO tLOW tHIGH tH D : D A T 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 ILEAK ISINK CIN fSCLK 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
MAX6648/MAX6692
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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