MAXIM MAX6666, MAX6667 Technical data
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:
Temperature (°C) = 235 - (400 x t
1
) / t
2
Where t1is fixed with a typical value of 10ms and t2is
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
Process Control
Industrial
HVAC and Environmental Control
Automotive
µP and µC Temperature Monitoring
Features
o Simple Single-Wire PWM Output
o ±1.0°C Accuracy at +25°C
o High Accuracy
±1°C at T
A
= +30°C
±2.5°C at TA= +10°C to +50°C
o Operate Up to +125°C
o Low 200µA Typical Current Consumption
o Small SOT23 package
MAX6666/MAX6667
High-Accuracy PWM Output Temperature
Sensors
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration
Ordering Information
V
CC
+3.3V
GND
DOUT
t
1
t
2
µC
INPUT TO
TIMER/COUNTER
MAX6666
MAX6667
Typical Operating Circuit
19-2138; Rev 3; 8/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART TEMP RANGE
MAX6666AUT+T -40°C to +125°C
MAX6667AUT+T -40°C to +125°C
PINPACKAGE
6 SOT23
6 SOT23
TOP
MARK
AATF
AATG
+
1
MAX6666
2
MAX6667
34
SOT23
6
I.C.
5
I.C.
I.C.GND
TOP VIEW
D
OUT
V
CC
MAX6666/MAX6667
High-Accuracy PWM Output Temperature
Sensors
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
(Voltages Referenced to GND)
V
CC
........................................................................-0.3V to +6.0V
D
OUT
MAX6666................................................-0.3V to (VCC+ 0.3V)
MAX6667 ..........................................................-0.3V to + 6.0V
D
OUT
Current ......................................................-1mA to +50mA
Continuous Current into Any Other Terminal....................±20mA
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
Supply Current I
Temperature Error VCC = +3.3V
Nominal t1 Pulse Width 10 ms
MAX6666 Output High Voltage IOH = 800µA V
MAX6666 Output Low Voltage IOL = 800µA 0.4 V
MAX6666 Fall Time CL = 100pF, RL = ∞ 80 ns
MAX6666 Rise Time CL = 100pF, RL = ∞ 80 ns
MAX6667 Output Low Voltage
MAX6667 Fall Time CL = 100pF, RL = 10kΩ 40 ns
MAX6667 Output Capacitance CL = 0 15 pF
MAX6667 Output Leakage <0.1 µA
Power-Supply Rejection Ratio PSRR VCC = +3.0V to +5.5V 0.3 1.0 °C/V
CC
CC
VCC = +3.0V to +5.5V 200 500 µA
TA = +30°C -1 +1
T
= +10°C to +50°C -2.5 +2.5
A
T
= 0°C to +100°C -3.8 +3.8
A
T
= -25°C to +125°C -4.8 +4.8
A
= -40°C, VCC = +3.3V -6 +6
T
A
I
= 1.6mA 0.4
SINK
I
= 5.0mA 1.2
SINK
3.0 5.5 V
- 0.4 V
C C
°C
V
MAX6666/MAX6667
High-Accuracy PWM Output Temperature
Sensors
_______________________________________________________________________________________
3
Typical Operating Characteristics
(VCC= +3.3V, TA= +25°C, unless otherwise noted.)
OUTPUT FREQUENCY vs. TEMPERATURE
50
40
30
20
OUTPUT FREQUENCY (Hz)
10
0
-40 10-15 356085110
TEMPERATURE (°C)
MAX6666/7 toc01
OUTPUT FREQUENCY (Hz)
OUTPUT ACCURACY
vs. TEMPERATURE
MAX6666/7 toc04
210
200
190
180
170
160
150
140
SUPPLY CURRENT (µA)
130
120
110
100
3
2
1
0
-1
OUTPUT ACCURACY (°C)
-2
-3
-40 20 50-10 80 110
TEMPERATURE (°C)
OUTPUT FREQUENCY vs. SUPPLY VOLTAGE
45
40
TEMP = +25°C
35
30
25
TEMP = -40°C
20
3.0 4.03.5 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT
vs. TEMPERATURE
VCC = +5.5V
-55 5 35-25
TEMP = +125°C
VCC = +3.3V
65
TEMPERATURE (°C)
95 125 155
MAX6666/7 toc02
MAX6666/7 toc05
SUPPLY CURRENT (µA)
T1 AND T2 TIMES
vs. TEMPERATURE
39
TWO TYPICAL PARTS
34
29
T
24
TIME (ms)
19
14
9
-40 20 50-10 80 110 140
2
T
1
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
158
156
154
152
150
148
146
144
142
140
3.0 4.03.5 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
MAX6666/7 toc03
MAX6666/7 toc06
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
0.50
0.45
0.40
0.35
0.30
0.25
PSRR (°C/V)
0.20
0.15
0.10
0.05
0
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
MAX6666/7 toc07
1.0
0.5
CHANGE IN TEMPERATURE (°C)
-0.5
-1.0
POWER-SUPPLY REJECTION
vs. FREQUENCY
MAX6666/7 toc08
0
VAC = 100mVp-p
0.01 10 100 1k0.1 1 10k
FREQUENCY (Hz)
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