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PDF MAX6575L Data sheet ( Hoja de datos )
| Número de pieza | MAX6575L | |
| Descripción | SOT Temperature Sensor with Multidrop Single-Wire Digital Interface | |
| Fabricantes | Maxim Integrated | |
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19-1485; Rev 0; 4/99
SOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
General Description
The MAX6575L/H is a low-cost, low-current temperature
sensor with a single-wire digital interface. It features
accuracy of ±3°C at +25°C, ±4.5°C at +85°C, and ±5°C
at +125°C. The MAX6575L/H is a monostable, externally
triggered temperature sensor that allows a microproces-
sor (µP) to interface with up to eight temperature sen-
sors using a single control line. Temperatures are
sensed by measuring the time delay between the falling
edge of the external triggering pulse and the falling
edge of the subsequent pulse delays reported from the
devices. Different sensors on the same I/O line use dif-
ferent timeout multipliers to avoid overlapping signals.
The MAX6575L/H features eight different timeout multi-
pliers; these are selectable by using the two time-select
pins on each device and choosing the “L” or “H” ver-
sion. The “L” version provides four delay ranges less
than 50ms. The “H” version provides four delay ranges
greater than 50ms. The MAX6575L/H is available in a
space-saving 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
Features
o Simple Single-Wire Interface to µP or µC
o Multidrop up to Eight Sensors on One Wire
o ±0.8°C Accuracy at +25°C (±3°C max)
o Operates from +2.7V to +5.5V Supply Voltage
o Low 150µA (typ) Supply Current
o Standard Operating Temperature Range:
-40°C to +125°C
o Small 6-Pin SOT23 Package
Ordering Information
PART
MAX6575LZUT
MAX6575HZUT
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
PIN-
SOT
PACKAGE TOP MARK
6 SOT23
AABG
6 SOT23
AABH
PART
MAX6575L
MAX6575H
Selector Guide
TIMEOUT MULTIPLIERS
(µs/°K)
5, 20, 40, 80
160, 320, 480, 640
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
VCC
0.1µF
VCC 10k
µP
I/O
GND
0.1µF
VDD
MAX6575L
TS1 CHIP #1
TS0 GND
I/O
0.1µF
+2.7V TO +5.5V
VDD
MAX6575H
TS1 CHIP #8
TS0 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 Sensor with
Multidrop Single-Wire Digital Interface
Table 2. Allowable Temperature Differential (°C)
TIMEOUT
MULTIPLIER
5
MAX6575L
20 40
80
5
>165
>165
>165
20 95.5 >165
40 132.0
80
160
320
480
640
160
>165
>165
>165
153.5
MAX6575H
320 480
>165
>165
>165
>165
>165
>165
>165
>165
>165
>165
70.2
640
>165
>165
>165
>165
>165
>165
37.9
Table 3. Typical Peak Noise Amplitude
PARAMETER
MAX6575L
Timeout
Multiplier
5 20 40
Noise
Amplitude
(°C)
±0.33
±0.15
±0.15
MAX6575H
80 160 320 480 640
±0.098
±0.091
±0.063
±0.043
±0.037
Time-Select Pins (TS1, TS0)
Table 1 shows the configuration of the Time-select pins
for the MAX6575L/H. Each device allows four selec-
table timeout multipliers intended to prevent overlap-
ping when multiple devices are used on the same I/O
line. Tie TS1 and TS0 to either GND or VDD to select the
desired temperature multiplier.
To monitor several chips on the same I/O line, different
timeout multipliers should be selected using the TS1
and TS0 pins. The timeout periods are then scaled so
that the response times will not overlap (see Timeout
Selection).
Applications Information
Timeout Selection
Under extreme temperature conditions, it is possible for
an overlap to occur between the timeout delays of dif-
ferent sensors in a multidrop configuration. This overlap
can occur only if the temperature differential recorded
between two devices is very large. Timeout overlaps
can be avoided in multidrop configurations by selecting
the appropriate timeout multipliers. Table 2 illustrates
the allowable temperature differential between devices
when the maximum error is present on each device.
Allowable temperature differentials greater than 165°C
indicate no overlap.
For example, if the maximum temperature differential in
a system is 80°C, the only combinations of timeout multi-
pliers that could result in timeout overlap would be a
320:480µs/°K (70.2°C) or a 480:640µs/°K (37.9°C) com-
bination. As long as these combinations of timeout multi-
pliers are not used in the same multidrop configuration,
no overlap can occur. Thus, seven MAX6575L/H parts
can be used in the same multidrop configuration if the
maximum temperature differential between parts is
80°C. A similar analysis shows that four MAX6575L/H
parts can be used when the maximum temperature dif-
ferential extends over the entire 165°C range of the part.
Noise Considerations
The accuracy of the MAX6575L/H timeout delay is sus-
ceptible to noise generated both internally and exter-
nally. The effects of external noise can be minimized by
placing a 0.1µF ceramic bypass capacitor close to the
device’s supply pin. Internal noise is inherent in the
operation of the device and is detailed in Table 3.
Internal averaging minimizes the effect of this noise when
using longer timeout multipliers. The effects of this noise
are included in the overall accuracy of the device as
specified in the Electrical Characteristics table.
_______________________________________________________________________________________ 5
5 Page 
SOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
NOTES
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX6575L.PDF ] | |
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