Hardware Hacking

MAX6687 Description
Local/Remote Temperature Switches in a µMAX Package
MAX6687 Vendor
Maxim
MAX6687 Categories
Thermostatic Switches

MAX6687 Features
Pin-Programmable Local Temperature Threshold in 5°C Increments in Two Distinct Ranges: +40°C to +80°C and +75°C to +115°C
Factory-Programmed Remote Threshold: +120°C (L Suffix) or +125°C (H Suffix)
Open-Drain Active-Low Outputs (MAX6687)
CMOS Push-Pull, Active-High Outputs (MAX6688)
±1.5°C Accuracy
2Hz Temperature Sampling Rate
215µA Average Supply Current
3.0V to 5.5V Power-Supply Voltage
8-Pin µMAX Package

MAX6687 Datasheet and Application Notes
MAX6687 Datasheet

Parameter Value
Functions Dual Output Temperature Switch
Functions Dual Temperature Alarms
Functions Open drain, active low output
Interface Logic
Accuracy (±°C) 1.5
Supply Voltage Range (V) 3.0 to 5.5
Temp. Thresh. (°C) +60
Temp. Thresh. (°C) +65
Op. Range (°C) -40 to +125
Temp. Thresh. (°C) +40
Temp. Thresh. (°C) +45
Temp. Thresh. (°C) +50
Temp. Thresh. (°C) +55
Temp. Thresh. (°C) +70
Temp. Thresh. (°C) +75
Temp. Thresh. (°C) +80
Package 8/µMAX (µSOP)
Price @ 1k $3.24
Products related to MAX6687
MAX6688

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MAX6688 Description
Local/Remote Temperature Switches in a µMAX Package
MAX6688 Vendor
Maxim
MAX6688 Categories
Thermostatic Switches

MAX6688 Features
Pin-Programmable Local Temperature Threshold in 5°C Increments in Two Distinct Ranges: +40°C to +80°C and +75°C to +115°C
Factory-Programmed Remote Threshold: +120°C (L Suffix) or +125°C (H Suffix)
Open-Drain Active-Low Outputs (MAX6687)
CMOS Push-Pull, Active-High Outputs (MAX6688)
±1.5°C Accuracy
2Hz Temperature Sampling Rate
215µA Average Supply Current
3.0V to 5.5V Power-Supply Voltage
8-Pin µMAX Package

MAX6688 Datasheet and Application Notes
MAX6688 Datasheet

Parameter Value
Functions Dual Output Temperature Switch
Functions Dual Temperature Alarms
Functions Push pull, active high output
Interface Logic
Accuracy (±°C) 1.5
Supply Voltage Range (V) 3.0 to 5.5
Op. Range (°C) -40 to +125
Temp. Thresh. (°C) +40
Temp. Thresh. (°C) +45
Temp. Thresh. (°C) +50
Temp. Thresh. (°C) +55
Temp. Thresh. (°C) +60
Temp. Thresh. (°C) +65
Temp. Thresh. (°C) +70
Temp. Thresh. (°C) +75
Temp. Thresh. (°C) +80
Package 8/µMAX (µSOP)
Price @ 1k $3.24
Products related to MAX6688
MAX6687

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MAX6685 Description
Dual-Output Remote-Junction Temperature Switches
MAX6685 Vendor
Maxim
MAX6685 Categories
Thermostatic Switches

MAX6685 Features
Pin-Programmed Lower Temperature Threshold from +40°C to +80°C or +75°C to +115°C (5°C Increments)
Preset Upper Threshold: +120°C or +125°C
Open-Drain, Active-Low Output for Upper Temperature Alarm
CMOS Push-Pull, Active-High or Open-Drain, Active-Low Output for Lower Temperature Alarm
1.5°C Accuracy
3.0V to 5.5V, 200µA Supply
8-Pin µMAX Package

MAX6685 Datasheet and Application Notes
MAX6685 Datasheet

Parameter Value
Interface Logic
Accuracy (±°C) 1
Supply Voltage Range (V) 3.0 to 5.5
Op. Range (°C) -55 to +125
Temp. Thresh. (°C) T(High): +120�C or +125�C
Temp. Thresh. (°C) T(Low): +40°C to +115°C in 5�C increments
Other Features Factory Set T(High) Outputs
Pin Programmable T(Low) Outputs
Push-Pull Active High Output

Package 8/µMAX (µSOP)
Price @ 1k $1.20
Products related to MAX6685
MAX6686

LM66 Description
Dual Output Internally Preset Thermostat [Life-time buy]
LM66 Vendor
National Semiconductor
LM66 Categories
Thermostatic Switches

LM66 Features
Digital outputs support TTL logic levels
Internal temperature sensor
2 internal comparators with hysteresis
Internal voltage reference
Currently available in 8-pin SO plastic package

LM66 Description
The LM66 is a precision low power thermostat. Two stable temperature trip points (VT1 and VT2) are generated by dividing down the LM66 1.250V bandgap voltage reference using a resistors divider network. The LM66 has two digital outputs. OUT1 goes LOW when the temperature exceeds T1 and goes HIGH when the the temperature goes below (T1-THYST). Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes below (T2-THYST). THYST is an internally set 5°C typical hysteresis.

The LM66 is currently available in an 8-lead small outline package.

LM66 Datasheet and Application Notes
LM66 Datasheet

Parameter Value
Package SOIC NARROW
Pins 8
Status Lifetime buy
Pricing $0.80
Products related to LM66
LM66CIM-RLSKB

LM88 Description
Factory Programmable Dual Remote-Diode Thermostat
LM88 Vendor
National Semiconductor
LM88 Categories
Thermostatic Switches

LM88 Features
2 external remote diode input channels
3 digital comparator outputs, 1 per remote diode and one T_CRIT common to both
Factory programmable greater than or less than comparisons
1°C comparator hysteresis
2 setpoints, T_SP0 and T_SP1, factory programmable in 4°C intervals
1 setpoint, T_CRIT, factory programmable in 1°C intervals
Active Low open-drain digital outputs
8-pin mini-SO plastic package

LM88 Description
The LM88 is a dual remote-diode temperature sensor with 3 digital comparators. The LM88 has 3 open-drain outputs (O_SP0#, O_SP1# and O_CRIT#) that can be used as interrupts or to signal system shutdown. The digital comparators can be factory programmed to make a greater than or less than comparison. When programmed for a greater than comparison outputs:

O_SP0# and O_SP1# activate when the temperatures measured by D0 or D1 exceed the associated setpoints of T_SP0 or T_SP1.

O_CRIT# activates when the temperature measured by either D0 or D1 exceeds setpoint T_CRIT.

T_CRIT can be set at 1°C intervals from -40°C to +125°C. T_SP0 and T_SP1 can be set at 4°C intervals in the range of T_CRIT +127°C/-128°C. Hysteresis for all comparators is set to 1°C. O_CRIT#, in conjunction with T_CRIT, could be used to prevent catastrophic damage to key subsystems such as notebook Card Bus cards while O_SP0# and O_SP1#, in conjunction with T_SP0 and T_SP1, can warn of an impending failure.

The LM88 is available in an 8-lead mini-small-outline package.

LM88 Datasheet and Application Notes
LM88 Datasheet

Parameter Value
Temperature Min (deg C) -40
Temperature Max (deg C) 85
Accuracy (+/-) (deg C) 3
Supply Min (Volt) 2.80
Supply Max (Volt) 3.80
Quiescent Current (mA) 1.50
Sensor Gain Digital Output
Comparators () 3
RemoteDiode ThermalSensors () 2
Preset Setpoints Yes
Products related to LM88
LM88CIMM-A LM88CIMMX-A