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Part: MAX6690MEE
Category:
Sensors
-> Temperature Sensors
Description: MAX6690 2°C Accurate Remote/local Temperature Sensor With Smbus Serial Interface
Company: Maxim Integrated Products
Datasheet: Download MAX6690MEE datasheet File size : 373 kB
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Datasheet text preview:
19-2190; Rev 0; 10/01
2°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface
General Description
The MAX6690 is a precise digital thermometer that reports the temperature of both a remote P-N junction and its own die. The remote junction can be a diode-connected transistor--typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type--that replaces c o n v e n t i o n a l thermistors or thermocouples. Remote accuracy is ±2°C for multiple transistor manufacturers, with no calibration needed. The remote junction can also be a common-collector PNP, such as a substrate PNP of a microprocessor (µP). The 2-wire serial interface accepts standard System Management Bus (SMBusTM), Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the a l a r m thresholds and to read temperature data. M e a s u r e m e n t s can be done automatically and autonomously, with the conversion rate programmed by the user, or programmed to operate in a single-shot mode. The adjustable conversion rate allows the user to optimize supply current and temperature update rate to match system needs. When the conversion rate is faster than 1Hz, the conversion results are available as a 7-bitplus-sign byte with a 1°C LSB. When the conversion rate is 1Hz or slower, the MAX6690 enters the extended mode. In this mode, 3 additional bits of temperature data are available in the extended resolution register, providi n g 10-bit-plus-sign resolution with a 0.125°C LSB. Single-shot conversions also have 0.125°C per LSB resolution when the conversion rate is 1Hz or slower. A parasitic resistance cancellation (PRC) mode can also be invoked for conversion rates of 1Hz or slower by setting bit 4 of the configuration register to 1. In PRC mode, the effect of series resistance on the leads of the external diode is canceled. The 11-bit conversion in PRC mode is performed in <500ms and is disabled for conversion rates faster than 1Hz. The one-shot conversion is also 11 bits in <500ms. The MAX6690 default low-temperature measurement limit is 0°C. This can be extended to -64°C by setting bit 5 of the configuration register to 1. The MAX6690 is available in a small, 16-pin QSOP surface-mount package.
Features
o High Accuracy ±2°C (max) from +70°C to +100°C (Remote) o 11-Bit, 0.125°C Resolution o Dual Channel: Measures Remote and Local Temperature o No Calibration Required o Programmable Under/Overtemperature Alarms o I2CTM-Compatible/SMBus Interface o +3V to +5.5V Supply Range
MAX6690
Ordering Information
PART MAX6690MEE TEMP. RANGE -55°C to +125°C PIN-PACKAGE 16 QSOP
Typical Operating Circuit
0.1µF 200 +3V TO +5V SUPPLY 10k EACH
CPU
VCC STBY DXP MAX6690 SMBCLK SMBDATA
CLOCK DATA
2200pF
DXN ADD0 ADD1
ALERT GND
INTERRUPT TO µC
Pin Configuration
TOP VIEW
N.C. 1 VCC 2 DXP 3 DXN 4 N.C. 5 ADD1 6 GND 7 GND 8 16 N.C. 15 STBY 14 SMBCLK
________________________Applications
Desktop Computers Notebook Computers Servers Thin Clients Workstations Test and Measurement Multichip Modules
MAX6690
13 N.C. 12 SMBDATA 11 ALERT 10 ADD0 9 N.C.
SMBus is a trademark of Intel Corp. I2C is a trademark of Philips Corp.
Patents pending.
QSOP
________________________________________________________________ Maxim Integrated Products
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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.
2°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface MAX6690
ABSOLUTE MAXIMUM RATINGS
(All voltages are referenced to GND unless otherwise noted.) VCC ........-0.3V to +6V DXP, ADD_ .......-0.3V to (VCC + 0.3V) DXN ....-0.3V to +0.8V SMBCLK, SMBDATA, ALERT, STBY.. ....-0.3V to +6V SMBDATA, ALERT Current .........-1mA to +50mA DXN Current ....±1mA ESD Protection (all pins, Human Body Model). ........2000V Continuous Power Dissipation (TA = +70°C) 16-Pin QSOP (derate 8.30mW/°C above +70°C).........667mW Operating Temperature Range ......-55°C to +125°C Junction Temperature. .....+150°C Storage Temperature Range ....-65°C to +165°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 = +3V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.)
PARAMETER SYMBOL CONDITIONS +60°C TA +100°C, VCC = +3.3V Accuracy (Local Sensor) 0°C TA +100°C, VCC = +3.3V -55°C TA +120°C, VCC = +3.3V +70°C TRJ +100°C, VCC = +3.3V (Note 1) Accuracy (Remote Sensor) Line Regulation Resolution (Legacy Mode) Resolution (Extended Mode) Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Supply Voltage Range Power-On Reset (POR) Threshold POR Threshold Hysteresis Standby Current Operating Current Average Operating Current Conversion Time Conversion Timing Error Remote-Diode Current IRJ High level Low level +80 +8 +100 +10 tC O N V SMBus static During conversion 0.25 conversion/s (Note 3) 2 conversion/s (Note 3) From stop bit to conversion completed, in legacy mode (Note 3) +95 VCC VCC, falling edge +3.0 +1.5 +2.0 +90 +3 +0.55 +40 +150 +125 +10 +1 +70 +250 +156 ±25 +120 +12 UVLO Conversion rate >1Hz Conversion rate 1Hz VCC input, disables A/D conversion, rising edge +1 +8 +0.125 +11 +2.60 +2.80 +90 +5.5 +2.5 +2.95 0°C TRJ +100°C, VCC = +3.3V (Note 1) -55°C TRJ +120°C, VCC = +3.3V (Notes 1, 2) MIN -2.5 -3.5 -5.0 -2 -3.5 -5 0.2 TYP MAX +2.5 +3.5 +5.0 +2 +3.5 +5 0.5 °C °C Bits °C Bits V mV V V mV µA mA µA ms % µA °C °C UNITS
TEMPERATURE-TO-DIGITAL CONVERTER
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2°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.)
PARAMETER Logic Input Low Voltage Logic Input High Voltage Input Leakage Current Output Low Sink Current Input Capacitance Output High Leakage Current Serial Clock Frequency Bus Free Time Between STOP and START Conditions 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 Data Hold Time Receive SCL/SDA Rise Time Receive SCL/SDA Fall Time SMBus Timeout tS U : S T A tHD:STA tSU:STO tLOW tHIGH tS U : D A T tH D : D A T tR tF tT I M E O U T SMBDATA and SMBCLK time low for reset of serial interface +25 90% to 90% 10% of SMBDATA to 90% of SMBCLK 90% of SMBCLK to 10% of SMBDATA662 10% to 10% 90% to 90% 90% of SMBDATA to 10% of SMBCLK (Note 5) fSCL tBUF SYMBOL VIL VIH ILEAK IOL CIN VOH = +5.5V (Note 4) 0 +4.7 +4.7 +50 +4 +4 +4.7 +4 +250 0 +1 +300 +40 VCC = +3.0V VCC = +5.5V VIN = GND or VCC VOL = +0.6V VOL = +0.4V +6 +1 +5 +1 +100 CONDITIONS VCC = +3.0V to +5.5V +2.2 +2.6 ±2 MIN TYP MAX +0.8 UNITS V V µA mA pF µA kHz µs µs µs µs µs µs µs ns µs µs ns ms
MAX6690
Note 1: +25°C TA +85°C. Note 2: If both the MAX6690 and the remote junction are below TA = -20°C, then VCC > 3.15V. Note 3: The conversion time doubles for the extended resolution mode. This causes the average operating current to approximately double. Note 4: The serial interface resets when SMBCLK is low for more than tTIMEOUT. Note 5: Note that a transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK's falling edge.
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