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MAX6676AUT+T

P1-P3P4-P6P7-P7
General Description
The MAX6676/MAX6677 are high-accuracy, low-power
temperature sensors with a single-wire output. The
MAX6676/MAX6677 convert the ambient temperature
into a ratiometric PWM output with temperature informa-
tion contained in the duty cycle of the output square
wave. The MAX6676 has an open-drain output and the
MAX6677 has a push-pull output.
The MAX6676/MAX6677 are specified for operation with
power-supply voltages from 1.8V to 3.6V, or from 3.6V to
5.5V (MAX6676 only). The typical unloaded supply cur-
rent is 80µA. All 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 1.8kHz (±20%) at +25°C.
The output format is decoded as follows:
Temperature (°C) = 398.15
✕
(t
1
/ t
2
) - 273.15
Where t
1
is fixed with a typical value of 0.24ms and t
2
is
modulated by the temperature. The MAX6676/
MAX6677 operate from -40°C to +125°C and are avail-
able in space-saving 6-pin SOT23 packages.
Applications
Process Control
Industrial
HVAC and Environmental Control
Automotive
Portable Devices
µP and µC Temperature Monitoring
Isolated Temperature Sensing
Features
♦ Simple Single-Wire, 1.8kHz PWM Output
♦ Operates Down to 1.8V
♦ High Accuracy
±1.5°C at T
A
= +25°C
±3.0°C at T
A
= 0°C to +85°C
♦ Operates from -40°C to +125°C
♦ Low 80µA Typical Current Consumption
♦ Small 6-Pin SOT23 Package
MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM Output Temperature
Sensors
________________________________________________________________ Maxim Integrated Products 1
GND
GNDV
CC
16GND
5 GND
DOUT
MAX6676
MAX6677
SOT23
TOP VIEW
2
34
Pin Configuration
Ordering Information
V
CC
V
CC
*REQUIRED ONLY FOR MAX6676.
5.1kΩ*
GND
DOUT
µC
INPUT TO
TIMER/COUNTER
MAX6676
t
2
t
1
0.1µF
Typical Operating Circuit
19-2660; Rev 1; 1/03
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.
PART
TEMP
RANGE
PIN-
PACKAGE
MAX6676AUT3-T -40°C to +125°C 6 SOT23-6
MAX6676AUT5-T -40°C to +125°C 6 SOT23-6
MAX6677AUT3-T -40°C to +125°C 6 SOT23-6
PART
OUTPUT
TYPE
SUPPLY
VOLTAGE
RANGE (V)
TOP
MARK
MAX6676AUT3 Open drain 1.8 to 3.6 ABBF
MAX6676AUT5 Open drain 3.6 to 5.5 ABBG
MAX6677AUT3 Push-pull 1.8 to 3.6 ABBH
Selector Guide
MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM Output Temperature
Sensors
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.8V to 3.6V (MAX6676AUT3/MAX6677AUT3), V
CC
= 3.6V to 5.5V (MAX6676AUT5), T
A
= -40°C to +125°C, unless otherwise
noted. Typical values are at V
CC
= 3.0V (MAX6676AUT3/MAX6677AUT3), V
CC
= 5.0V (MAX6676AUT5), T
A
= +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.
Note 1: Parts are tested at +25°C. Specifications are guaranteed by design over temperature.
(Voltages Referenced to GND)
V
CC
........................................................................-0.3V to +6.0V
DOUT (MAX6676)..................................................-0.3V to +6.0V
DOUT (MAX6677).......................................-0.3V to (V
CC
+ 0.3V)
DOUT Current .....................................................-1mA to +50mA
ESD Protection (DOUT, Human Body Model) .................±2000V
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).........695.7mW
Operating Temperature Range .........................-40°C to +125°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
MAX6676AUT3/MAX6677AUT3 1.8 3.6
Supply Voltage Range V
CC
MAX6676AUT5 3.6 5.5
V
Supply Current I
CC
R
L
= ∞ 80 200 µA
T
A
= +25°C
-1.5 +1.5
T
A
= 0°C to +85°C
-3.0 +3.0
T
A
= -20°C to +100°C -4.2 +4.2
Temperature Error
T
A
= -40°C to +125°C
-5.5 +5.5
°C
Nominal t
1
Pulse Width 240 µs
Output High Voltage V
OH
I
OH
= 800µA, MAX6677
V
CC
-
0.3
V
Output Leakage Current V
OUT
= V
CC
0.1 µA
Output Low Voltage V
OL
I
OL
= 3mA 0.3 V
Fall Time t
F
C
L
= 100pF, R
L
= 10kΩ 20 ns
MAX6676, C
L
= 15pF, R
L
= 10kΩ 300
Rise Time t
R
MAX6677, C
L
= 100pF, R
L
= 10kΩ 30
ns
Digital Output Capacitance C
OUT
15 pF
Power-Supply Rejection Ratio PSRR V
CC
= 1.8V - 3.6V -1.2 +0.4 +1.2 °C/V
MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM Output Temperature
Sensors
_______________________________________________________________________________________ 3
OUTPUT FREQUENCY
vs. TEMPERATURE
MAX6676 toc01
TEMPERATURE (°C)
OUTPUT FREQUENCY (kHz)
85603510-15
1.5
2.0
2.5
3.0
1.0
-40 110
MAX6676AUT3 OUTPUT FREQUENCY
vs. SUPPLY VOLTAGE
MAX6676 toc02
SUPPLY VOLTAGE (V)
OUTPUT FREQUENCY (Hz)
3.33.02.72.42.1
1.75
2.00
2.25
2.50
1.50
1.8 3.6
TEMP = +125°C
TEMP = +25°C
TEMP = -40°C
t
1
AND t
2
TIMES
vs. TEMPERATURE
MAX6676 toc03
TEMPERATURE (°C)
TIME (µs)
85603510-15
250
300
350
450
200
-40 110
t
2
t
1
400
MAX6676AUT3 SUPPLY CURRENT
vs. TEMPERATURE
MAX6676 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
85603510-15
100
200
300
400
500
600
0
-40 110
V
CC
= 3.6V
V
CC
= 3.0V
V
CC
= 1.8V
5.1kΩ PULLUP RESISTOR
MAX6676AUT3 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6676 toc06
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
3.33.02.72.42.1
50
100
150
200
250
300
350
400
450
0
1.8 3.6
5.1kΩ PULLUP
NO PULLUP
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
MAX6676 toc07
TEMPERATURE (°C)
PSRR (°C/V)
100 1257550250-25
-0.5
0
1.0
-1.0
-50
0.5
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX6676 toc08
FREQUENCY (Hz)
CHANGE IN TEMPERATURE (°C)
1k
10010
-4
-2
0
2
-6
1 10k
V
AC
= 100mV
P-P
1
-1
-3
-5
Typical Operating Characteristics
(V
CC
= 3.0V, T
A
= +25°C, unless otherwise noted.)
MAX6676 toc09
1V/div
10ns/div
0V
OUTPUT FALL TIME
(C
L
= 100pF, R
L
= 100kΩ)
OUTPUT ACCURACY
vs. TEMPERATURE
MAX6676 toc04
TEMPERATURE (°C)
OUTPUT ACCURACY (°C)
85603510-15
-3
-1
1
3
5
-5
-40
110
P1-P3P4-P6P7-P7

MAX6676AUT+T

Mfr. #:
Buy MAX6676AUT+T
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors
Lifecycle:
New from this manufacturer.
Delivery:
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