MAX6666_09 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – High-Accuracy PWM Output Temperature Sensors

19-2138; Rev 3; 8/09
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 temper-
ature information contained in the duty cycle of the out-
put 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 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.
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 T_A = +10°C to +50°C
o Operate Up to +125°C
o Low 200µA Typical Current Consumption
o Small SOT23 package
Applications
Process Control
Industrial
HVAC and Environmental Control
Automotive
µP and µC Temperature Monitoring
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX6666AUT+T -40°C to +125°C 6 SOT23
MAX6667AUT+T -40°C to +125°C 6 SOT23
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP
MARK
AATF
AATG
Typical Operating Circuit
+3.3V
V_CC
MAX6666
MAX6667
DOUT
GND
t₁
t₂
µC
INPUT TO
TIMER/COUNTER
Pin Configuration
TOP VIEW
+
D_OUT 1
V_CC 2
MAX6666
MAX6667
6 I.C.
5 I.C.
GND 3
4 I.C.
SOT23
________________________________________________________________ Maxim Integrated Products 1
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.