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PDF MAX6673 Data sheet ( Hoja de datos )
| Número de pieza | MAX6673 | |
| Descripción | PWM Output Temperature Sensors | |
| Fabricantes | Maxim Integrated Products | |
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19-2458; Rev 0; 10/02
www.DataSheet4U.com
PWM Output Temperature Sensors
in SC70 Packages
General Description
The MAX6672/MAX6673 are low-current temperature
sensors with a single-wire output. These temperature
sensors convert the ambient temperature into a 1.4kHz
PWM output, which contains the temperature informa-
tion in its duty cycle. The MAX6672 has an open-drain
output and the MAX6673 has a push-pull output.
The MAX6672/MAX6673 operate from 2.4V to 5.5V with
a maximum supply current of 150µA. Both devices fea-
ture a single-wire output that minimizes the number of
pins necessary to interface with a microprocessor.
The MAX6672/MAX6673 are available in 5-pin SC70
packages.
Features
o Simple Single-Wire PWM Output
o Tiny SC70 Package
o Low 60µA (typ) Supply Current Consumption
o 1.4kHz Nominal Frequency
o Choice of Outputs
Open Drain (MAX6672)
Push-Pull (MAX6673)
o 2.4V to 5.5V Supply Range
Applications
Industrial and Process Control
HVAC
Automotive
Environmental Control
Isolated Temperature Sensing
Ordering Information
PART
TEMP RANGE
MAX6672AXK-T -40°C to +125°C
MAX6673AXK-T -40°C to +125°C
PIN-
PACKAGE
5 SC70-5
5 SC70-5
TOP
MARK
ACQ
ACR
Typical Application Circuit
Pin Configuration
0.1µF
VCC
MAX6672
MAX6673
GND
µC
GPIO TO CONTROL
* SHUTDOWN
INPUT TO TIMER/
COUNTER
* PULLUP RESISTOR REQUIRED ONLY FOR THE MAX6672.
TOP VIEW
DOUT 1
5 VCC
MAX6672
N.C. 2 MAX6673
GND 3
4 GND
SC70
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
www.DataSheet4U.com
PWM Output Temperature Sensors
in SC70 Packages
Table 1. Time Ratio vs. Temperature
TIME RATIO
(t1/t2)
0.936
0.878
0.807
0.714
0.646
0.602
0.560
TEMPERATURE
(°C)
125
100
70
30
0
-25
-40
high enough to provide the required measurement res-
olution. The interface for the MAX6672 requires a pullup
resistor.
Thermal Response Time
The time periods t1 (low) and t2 (high) are values that
are easily read by the µP timer/counter. The tempera-
ture reading is then calculated using software. Since
both periods are obtained consecutively, using the
same clock, performing the division indicated in the
above formulae results in a ratiometric value that is
independent of the exact frequency.
Sensing Circuit Board and Ambient
Temperatures
Temperature sensor ICs such as the MAX6672/
MAX6673 that sense their own die temperatures must
be mounted on or close to the object whose tempera-
ture they are intended to measure. Because there is a
good thermal path between the SC70 package’s metal
leads and the IC die, the MAX6672/MAX6673 can
accurately measure the temperature of the circuit
board to which they are soldered. If the sensor is
intended to measure the temperature of a heat-generat-
ing component on the circuit board, it should be mount-
ed as close as possible to that component and should
share supply and ground traces (if they are not noisy)
with that component where possible. This maximizes
the heat transfer from the component to the sensor.
t2 t1
Figure 1. PWM Waveform Timing
Block Diagram
5
VCC
TEMPERATURE
SENSOR
PWM
MODULATOR
GND
3, 4
DOUT 1
t2 t1
The thermal path between the plastic package and the
die is not as good as the path through the leads, so the
MAX6672/MAX6673, like all temperature sensors in
plastic packages, are less sensitive to the temperature
of the surrounding air than they are to the temperature
of their leads. They can be successfully used to sense
ambient temperature if the circuit board is designed to
track the ambient temperature.
As with any IC, the wiring and circuits must be kept
insulated and dry to avoid leakage and corrosion,
especially if the part is operated at cold temperatures
where condensation can occur.
The error caused by power dissipation in the MAX6672/
MAX6673 is negligible.
Chip Information
TRANSISTOR COUNT: 601
PROCESS: BiCMOS
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MAX6673.PDF ] | |
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