MAX6666 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – High-Accuracy PWM Output Temperature Sensors

19-2138; Rev 1; 12/03
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 and µMAX 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 T_A = +10°C to +50°C
o Operate Up to +125°C
o Low 200µA Typical Current Consumption
o Multiple Package Options
6-Pin SOT23
8-Pin SO
8-Pin µMAX
PART
MAX6666AUT-T
MAX6666AUA
MAX6666ASA
MAX6667AUT-T
MAX6667AUA
MAX6667ASA
Ordering Information
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
PIN-PACKAGE
6 SOT23-6
8 µMAX
8 SO
6 SOT23-6
8 µMAX
8 SO
Typical Operating Circuit
Pin Configurations
+3.3V
V_CC
MAX6666
MAX6667
DOUT
GND
t₁
t₂
µC
INPUT TO
TIMER/COUNTER
TOP VIEW
D_OUT 1
V_CC 2
GND 3
IC 4
MAX6666
MAX6667
8 IC
7 IC
6 IC
5 IC
µMAX/SO
Pin Configurations continued at end of data sheet.
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