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PDF MAX6577 Data sheet ( Hoja de datos )
| Número de pieza | MAX6577 | |
| Descripción | SOT Temperature Sensors with Period/Frequency Output | |
| Fabricantes | Maxim Integrated | |
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19-1484; Rev 0; 4/99
SOT Temperature Sensors with
Period/Frequency Output
General Description
The MAX6576/MAX6577 are low-cost, low-current tem-
perature sensors with a single-wire output. The MAX6576
converts the ambient temperature into a square wave
with a period proportional to absolute temperature (°K).
The MAX6577 converts the ambient temperature into a
square wave with a frequency proportional to absolute
temperature. The MAX6576 offers accuracy of ±3°C at
+25°C, ±4.5°C at +85°C, and ±5°C at +125°C. The
MAX6577 offers accuracy of ±3°C at +25°C, ±3.5°C at
+85°C, and ±4.5°C at +125°C.
Both devices feature a single-wire output that minimizes
the number of pins necessary to interface with a micro-
processor. The period/frequency range of the output
square wave can be selected by hard-wiring the two
time-select pins (TS0, TS1) to either VDD or GND. The
MAX6576/MAX6577 are available in space-saving 6-pin
SOT23 packages.
Features
o Simple Single-Wire Output
o Two Output Types Available
Temperature to Period (µs) (MAX6576)
Temperature to Frequency (Hz) (MAX6577)
o ±0.8°C Accuracy at +25°C (±3°C max)
o No External Components
o Operates from +2.7V to +5.5V Supply Voltage
o Low 140µA Typical Supply Current
o Standard Operating Temperature Range:
-40°C to +125°C
o Small 6-Pin SOT23 Package
Applications
Critical µP and µC Temperature Monitoring
Portable Battery-Powered Equipment
Cell Phones
Battery Packs
Hard Drives/Tape Drives
Networking and Telecom Equipment
Medical Equipment
Automotive
Ordering Information
PART
TEMP. RANGE
MAX6576ZUT -40°C to +125°C
MAX6577ZUT -40°C to +125°C
PIN-
PACKAGE
6 SOT23
6 SOT23
SOT
TOP MARK
AABI
AABJ
Pin Configuration
Typical Operating Circuit
TOP VIEW
VDD 1
6 OUT
MAX6576
GND 2 MAX6577 5 TS1
N.C. 3
4 TS0
SOT23-6
+2.7V TO +5.5V
0.1µF
VDD
0.1µF
MAX6576
TS1 MAX6577
TS0 GND
OUT
VCC
µP
GND
I/O
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
SOT Temperature Sensors with
Period/Frequency Output
MAX6576
CLOCK WAVEFORM OUTPUT
MAX6577
CLOCK WAVEFORM OUTPUT
tOUT tOUT fOUT = 1 / tOUT
fOUT (°K)
Figure 1. MAX6576 Timing Diagram
Figure 2. MAX6577 Timing Diagram
Applications Information
Quick-Look Circuits
Figure 3 shows a quick-look application circuit for the
MAX6576 using a universal counter measuring period.
TS1 and TS0 are both tied to ground to select a scalar
multiplier of 10µs/°K. The MAX6576 converts the ambi-
ent temperature into a square wave with a period that is
10 times the absolute temperature of the device in µs.
At room temperature, the universal counter will display
approximately 2980µs.
Figure 4 shows a quick-look application circuit for the
MAX6577 using a universal counter measuring frequen-
cy. TS1 is tied to ground and TS0 is tied to VDD to
select a scalar multiplier of 1Hz/°K. The MAX6577 con-
verts the ambient temperature into a square wave with
a frequency that is equal to the absolute temperature of
the device in Hertz. At room temperature, the universal
counter will display approximately 298Hz.
Interfacing with a Microcontroller
Figure 5 shows the MAX6577 interfaced with an 8051
µC. In this example, TS1 is tied to ground and TS0 is
tied to VDD to select a scalar multiplier of 1Hz/°K. The
MAX6577 converts the ambient temperature into a
square wave with a frequency that is equal to the
absolute temperature of the device in Hertz. The 8051
µC reads the frequency of the square-wave output of
the MAX6577 into Timer 0 and displays the temperature
as degrees Celsius in binary on Port 1. Listing 1 pro-
vides the code for this application. The interface is simi-
lar for the MAX6576, except the µC will perform a
period measurement.
Noise Considerations
The accuracy of the MAX6576/MAX6577 is susceptible
to noise generated both internally and externally. The
effects of external noise can be minimized by placing a
0.1µF ceramic bypass capacitor close to the supply pin
of the devices. Internal noise is inherent in the opera-
tion of the devices and is detailed in Table 3. Internal
averaging minimizes the effect of this noise when using
longer scalar timeout multipliers. The effects of this noise
are included in the overall accuracy of the devices as
specified in the Electrical Characteristics.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX6577.PDF ] | |
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