MAX6666/MAX6667
High-Accuracy PWM Output Temperature Sensors
General Description
The MAX6666/MAX6667 are high-accuracy, low-cost,
low-power temperature sensors with a single-wire
output. The MAX6666/MAX6667 convert the ambient
temperature into a ratiometric PWM output with temperature information contained in the duty cycle of the output
square wave. The MAX6666 has a push-pull output and
the MAX6667 has an open-drain output.
The MAX6666/MAX6667 operate at supply voltages from
+3V to +5.5V. The typical unloaded supply current at 5.0V
is 200µA. Both devices feature a single-wire output that
minimizes the number of pins necessary to interface with
a microprocessor (µP). The output is a square wave with
a nominal frequency of 35Hz (±20%) at +25°C. The output
format is decoded as follows:
Features
●● Simple Single-Wire PWM Output
●● ±1.0°C Accuracy at +25°C
●● High Accuracy
±1°C at TA = +30°C
±2.5°C at TA = +10°C to +50°C
●● Operate Up to +125°C
●● Low 200µA Typical Current Consumption
●● Small SOT23 package
Temperature (°C) = 235 - (400 x t1)/t2
Where t1 is fixed with a typical value of 10ms and t2 is
modulated by the temperature (Figure 1). The MAX6666/
MAX6667 operate from -40°C to +125°C and are available in space-saving SOT23 packages.
Applications
●●
●●
●●
●●
PART
Process Control
Industrial
HVAC and Environmental Control
µP and µC Temperature Monitoring
TEMP RANGE
-40°C to +125°C 6 SOT23
AATF
MAX6667AUT+T
-40°C to +125°C 6 SOT23
AATG
TOP VIEW
t1
VCC
DOUT
t2
MAX6666
MAX6667
µC
DOUT
INPUT TO
TIMER/COUNTER
TOP
MARK
MAX6666AUT+T
Pin Configuration
+3.3V
1
VCC 2
+
MAX6666
MAX6667
GND 3
SOT23
19-2138; Rev 4; 4/14
PINPACKAGE
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Circuit
GND
Ordering Information
6
I.C.
5
I.C.
4
I.C.
MAX6666/MAX6667
High-Accuracy PWM Output Temperature Sensors
Absolute Maximum Ratings
(Voltages Referenced to GND)
VCC........................................................................-0.3V to +6.0V
DOUT
MAX6666.............................................. .-0.3V to (VCC + 0.3V)
MAX6667..........................................................-0.3V to + 6.0V
DOUT Current..................................................... .-1mA to +50mA
Continuous Current into Any Other Terminal....................±20mA
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 7.4mW/°C above +70°C)...........595mW
Operating Temperature Range.......................... -40°C to +150°C
Storage Temperature Range............................. -65°C to +150°C
Junction Temperature.......................................................+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 = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.)
PARAMETER
SYMBOL
Supply Voltage Range
VCC
Supply Current
ICC
CONDITIONS
TYP
MAX
5.5
V
200
500
µA
3.0
VCC = +3.0V to +5.5V
TA = +30°C
Temperature Error
MIN
VCC = +3.3V
-1
+1
TA = +10°C to +50°C
-2.5
+2.5
TA = 0°C to +100°C
-3.8
+3.8
TA = -25°C to +125°C
-4.8
+4.8
-6
+6
TA = -40°C, VCC = +3.3V
Nominal t1 Pulse Width
10
UNITS
°C
ms
MAX6666 Output High Voltage
IOH = 800µA
MAX6666 Output Low Voltage
IOL = 800µA
MAX6666 Fall Time
CL = 100pF, RL = ∞
80
ns
MAX6666 Rise Time
CL = 100pF, RL = ∞
80
ns
MAX6667 Output Low Voltage
0.4
1.2
MAX6667 Output Capacitance
CL = 0
MAX6667 Output Leakage
www.maximintegrated.com
0.4
ISINK = 5.0mA
CL = 100pF, RL = 10kW
PSRR
V
ISINK = 1.6mA
MAX6667 Fall Time
Power-Supply Rejection Ratio
VCC - 0.4
VCC = +3.0V to +5.5V
40
V
V
ns
15
pF
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