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Part: MAX6688UA40H
Category:
Sensors
-> Temperature Sensors
Description: MAX6687, MAX6688 Local/remote Temperature Switches in a µMAX Package
Company: Maxim Integrated Products
Datasheet: Download MAX6688UA40H datasheet File size : 373 kB
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Datasheet text preview:
19-2636; Rev 1; 1/03
Local/Remote Temperature Switches in a µMAX Package
General Description
The MAX6687/MAX6688 comprise a remote-junction temperature switch and a local temperature switch in a single package. The remote-junction switch uses an external P-N junction (typically a diode-connected transistor on the die of an external CPU, ASIC, or FPGA) as a sensing element to measure the remote temperature. The remote-junction temperature switch has a factoryp r o g r a m m e d trip temperature threshold of either +120°C or +125°C. The local temperature switch has a pin-programmable temperature threshold that is set by connecting pins S1 and S2 to ground, to VDD, or leaving them floating. Hysteresis for both local and remote t h r e s h o l d s is 5°C. The MAX6687/MAX6688 do not a s s e r t on transient (single-sample) faults or when power is first applied. The MAX6687 has two open-drain active-low outputs while the MAX6688 has two push-pull active-high outputs. TREMOTE asserts a logic signal when the remote temperature exceeds the factory-programmed +120°C or +125°C trip threshold. TLOCAL is asserted when the die temperature exceeds the pin-programmed threshold, which is controlled by pins S1 and S2. The local thresholds are available in two ranges in 5°C increments. The two ranges are +40°C to +80°C and +75°C to +115°C. The MAX6687/MAX6688 operate from a 3.0V to 5.5V power supply and are available in a space-saving 8-pin µMAX package.
Features
o Pin-Programmable Local Temperature Threshold in 5°C Increments in Two Distinct Ranges: +40°C to +80°C and +75°C to +115°C o Factory-Programmed Remote Threshold: +120°C (L Suffix) or +125°C (H Suffix) o Open-Drain Active-Low Outputs (MAX6687) o CMOS Push-Pull, Active-High Outputs (MAX6688) o ±1.5°C Accuracy o 2Hz Temperature Sampling Rate o 215µA Average Supply Current o 3.0V to 5.5V Power-Supply Voltage o 8-Pin µMAX Package
MAX6687/MAX6688
Ordering Information
PART MAX6687UA40L MAX6687UA40H MAX6687UA75L MAX6687UA75H MAX6688UA40L MAX6688UA40H MAX6688UA75L MAX6688UA75H TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 8 µMAX 8 µMAX 8 µMAX 8 µMAX 8 µMAX 8 µMAX 8 µMAX 8 µMAX
Applications
CPU Temperature Protection FPGA Temperature Protection Fan Control Temperature Alarms
Pin Configurations/Functional Diagrams/Selector Guide appear at end of data sheet.
Typical Operating Circuit
3.3V DXP VDD 3.3V DXP 3.3V VDD TREMOTE TO SYSTEM SHUTDOWN
CS DXN µP S1 S2
MAX6687
TREMOTE TLOCAL TO SYSTEM SHUTDOWN µP
CS DXN S1 S2
MAX6688
12V
TLOCAL GND GND
N
________________________________________________________________ Maxim Integrated Products
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Local/Remote Temperature Switches in a µMAX Package MAX6687/MAX6688
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND VDD, TLOCAL, TREMOTE ...........-0.3V to +6V DXN .....-0.3V to +0.8V All Other Pins....-0.3V to (VDD + 0.3V) Input Current .......5mA Output Current ...........20mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.1mW/°C above +70°C) ....330mW Operating Temperature Range .......-40°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
(VDD = 3V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1)
PARAMETER Power-Supply Range Average Supply Current Supply Current During Conversion Power-On Reset (POR) Threshold POR Threshold Hysteresis Remote-Diode Temperature Threshold Accuracy, Rising Temperature TA = +25°C, VDD = 3.3V TTH TA = 0°C to +85°C, VDD = 3.3V TA = -40°C to +125°C, VDD = 3.3V Temperature trip thresholds from +40°C to +105°C, VDD = 3.3V Temperature trip thresholds +110°C and +115°C, VDD = 3.3V -1.5 -3.0 -5.0 -3.0 -3.5 5.0 0.6 VOH VOL VIL VIH 1.8 10 VOUT = 5.5V, MAX6687 1 ISOURCE = 1mA, MAX6688 ISINK = 1mA VDD - 0.2 0.2 0.4 POR VDD falling edge 1 SYMBOL VDD IDD CONDITION MIN 3 215 400 1.5 50 +1.5 +3.0 +5.0 +3.0 °C +3.5 °C °C/V V V V V µA µA °C TYP MAX 5.5 500 800 2.0 UNITS V µA µA V mV
Internal Temperature Threshold Accuracy, Rising Temperature
TTH
Temperature Threshold Hysteresis Temperature Threshold Supply Sensitivity Output Voltage High Output Voltage Low Logic Input Low Voltage (S1, S2) Logic Input High Voltage (S1, S2) Input Current (S1, S2) Open-Drain Output Leakage Current
THYST
2
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Local/Remote Temperature Switches in a µMAX Package
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1)
PARAMETER Temperature Conversion Time Temperature Sample Period Current Sourcing for External Diode High level Low level SYMBOL CONDITION MIN 0.2 0.4 80 8 TYP 0.25 0.5 100 10 MAX 0.3 0.6 120 12 UNITS s s µA
MAX6687/MAX6688
Note 1: All parameters are tested at +25°C. Temperature specifications over a range of -40°C to +125°C are guaranteed by design.
Typical Operating Characteristics
(VDD = 3.3V, CS = 2200pF, TA = +25°C, unless otherwise noted.)
AVERAGE SUPPLY CURRENT vs. AMBIENT TEMPERATURE
MAX6687/88 toc01
AVERAGE SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6687/88 toc02
300 AVERAGE SUPPLY CURRENT (µA)
300 AVERAGE SUPPLY CURRENT (µA) TA = +100°C
260
260
220
220
180
180
TA = -40°C TA = +25°C
140
140
100 -50 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C)
100 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
TEMPERATURE TRIP THRESHOLD ERROR vs. CS CAPACITANCE
MAX6687/88 toc03
REMOTE TEMPERATURE TRIP THRESHOLD ERROR vs. AMBIENT TEMPERATURE
UPPER TRIP THRESHOLD ERROR (°C) MAX6688U40H TREMOTE TRIP = +125°C
MAX6687/88 toc04
TEMPERATURE TRIP THRESHOLD ERROR (°C)
4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 1
MAX6688U40H S1 = S2 = FLOAT
1 0 -1 -2 -3 -4 -5
10 CS CAPACITANCE (nF)
100
-50
-25
0
25
50
75
100
AMBIENT TEMPERATURE (°C)
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