MAX6666 MAXIM [Maxim Integrated Products], MAX6666 Datasheet

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MAX6666

Manufacturer Part Number
MAX6666
Description
High-Accuracy PWM Output Temperature Sensors
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
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:
Where t
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.
19-2138; Rev 1; 12/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Process Control
Industrial
HVAC and Environmental Control
Automotive
µP and µC Temperature Monitoring
1
MAX6666
MAX6667
Temperature (°C) = 235 - (400 x t
+3.3V
GND
V
is fixed with a typical value of 10ms and t
CC
Typical Operating Circuit
DOUT
High-Accuracy PWM Output Temperature
________________________________________________________________ Maxim Integrated Products
General Description
t
1
t
2
Applications
1
INPUT TO
TIMER/COUNTER
) / t
2
C
2
is
o Simple Single-Wire PWM Output
o ±1.0°C Accuracy at +25°C
o High Accuracy
o Operate Up to +125°C
o Low 200µA Typical Current Consumption
o Multiple Package Options
MAX6666AUT-T
MAX6666AUA
MAX6666ASA
MAX6667AUT-T
MAX6667AUA
MAX6667ASA
Pin Configurations continued at end of data sheet.
±1°C at T
±2.5°C at T
6-Pin SOT23
8-Pin SO
8-Pin µMAX
PART
TOP VIEW
A
D
GND
V
OUT
CC
A
IC
= +30°C
= +10°C to +50°C
1
2
4
3
-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
TEMP RANGE
Ordering Information
MAX6666
MAX6667
MAX/SO
Pin Configurations
6
8
7
5
Sensors
6 SOT23-6
8 µMAX
8 SO
6 SOT23-6
8 µMAX
8 SO
PIN-PACKAGE
IC
IC
IC
IC
Features
1

Related parts for MAX6666

MAX6666 Summary of contents

Page 1

... 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 200µ ...

Page 2

... SYMBOL Supply Voltage Range V Supply Current I Temperature Error Nominal t Pulse Width 1 MAX6666 Output High Voltage MAX6666 Output Low Voltage MAX6666 Fall Time MAX6666 Rise Time MAX6667 Output Low Voltage MAX6667 Fall Time MAX6667 Output Capacitance MAX6667 Output Leakage Power-Supply Rejection Ratio ...

Page 3

High-Accuracy PWM Output Temperature (V = +3.3V +25°C, unless otherwise noted OUTPUT FREQUENCY vs. TEMPERATURE -40 - 110 TEMPERATURE ( C) OUTPUT ACCURACY vs. TEMPERATURE 3 ...

Page 4

... NAME µMAX/SO SOT23 OUT GND 4– _______________________________________________________________________________________ Typical Operating Characteristics (continued) OUTPUT RISE AND FALL TIMES vs. CAPACITIVE LOADS MAX6666/7 toc09 1200 1000 FALL TIME 800 600 400 200 0 0 300 OUTPUT HIGH VOLTAGE 3. SOURCE 3.25 3.20 3.15 3.10 3.05 ...

Page 5

... To calculate the temperature, use the expression below: Temperature (°C) = +235 - (400 x t The µC or µP measures the output of the MAX6666/ MAX6667 by counting t and temperature based on their ratio. The resolution of the count is a function of the processor clock frequency and the resolution of the counter ...

Page 6

... LOAD CURRENT (mA) Figure 3. MAX6666 Temperature Error Due to Load Current 1°C. Use Figure 3 to estimate the temperature error with respect to the MAX6666 packages. Low-Voltage Logic Use the MAX6667 open-drain output to drive low-volt- age devices. As shown in Figure 4, connect a pullup resistor from the low-voltage logic supply to the MAX6667 output. Limit the resistor’ ...

Page 7

High-Accuracy PWM Output Temperature (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) _______________________________________________________________________________________ Sensors Package Information 7 ...

Page 8

High-Accuracy PWM Output Temperature Sensors (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry ...

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