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MAX6575HZUT+T-MAX6575LZUT+
SOT Temperature Sensor with Multidrop Single Wire Digital Interface
General DescriptionThe 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 sensors
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 sub-
sequent pulse delays reported from the devices. Different
sensors on the same I/O line use different timeout multi-
pliers to avoid overlapping signals.
The MAX6575L/H features eight different timeout multipli-
ers; these are selectable by using the two time-select pins
on each device and choosing the “L” or “H” version. 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
Features●Simple Single-Wire Interface to μP or μC●Multidrop up to Eight Sensors on One Wire●±0.8°C Accuracy at +25°C (±3°C max)●Operates from +2.7V to +5.5V Supply Voltage●Low 150μA (typ) Supply Current●Standard Operating Temperature Range
-40°C to +125°C●Small 6-Pin SOT23 Package
Pin Configuration appears at end of data sheet.
PARTTEMP.RANGEPIN-
PACKAGE
SOT
TOP MARKMAX6575LZUT-40°C to +125°C6 SOT23AABG
MAX6575HZUT-40°C to +125°C6 SOT23AABH
PARTTIMEOUT MULTIPLIERS
(µs/°K)MAX6575L5, 20, 40, 80
MAX6575H160, 320, 480, 640
GNDTS0
TS1
MAX6575LMAX6575HI/O
0.1µF
0.1µF0.1µFVDD
CHIP #1CHIP #810kΩ
+2.7V TO +5.5V
GNDTS0
TS1
I/O
VDD
I/O
GND
VCC
VCC
MAX6575L/HSOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
Typical Operating Circuit
Ordering Information
Selector Guide
Terminal Voltage (with respect to GND)
VDD......................................................................-0.3V to +6V
TS1, TS0...............................................-0.3V to (VDD + 0.3V)
I/O.........................................................................-0.3V to +6VInput/Output Current, All Pins...........................................±20mA
Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 7.10mW/°C above +70°C).........571mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) ..................................+300°C
(VDD = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are specified at TA = +25°C and VDD = +5V, unless otherwise noted.)
Note 1: See Temperature Accuracy histograms in Typical Operating Characteristics.
Note 2: Guaranteed by design. Not production tested.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVDD RangeVDD2.75.5V
Supply CurrentIDDVDD = 5.5VTA = -40°C to +85°C150250µATA = -40°C to +125°C400
Temperature Sensor Error
(Note 1)
TA = -20°C-7.5±1.1+7.5
TA = 0°C-5.5±0.9+5.5
TA = +25°C-3.0±0.8+3.0
TA = +85°C-4.5±0.5+4.5
TA = +125°C-5.0±0.5+5.0
Output Pulse DelayD1
MAX6575L, T (temp) in °K,
Figure 1
VTS1 = GND, VTS0 = GND5TD2VTS1 = GND, VTS0 = VDD20TD3VTS1 = VDD, VTS0 = GND40TD4VTS1 = VDD, VTS0 = VDD80TD5
MAX6575H, T (temp) in °K,
Figure 1
VTS1 = GND, VTS0 = GND160TD6VTS1 = GND, VTS0 = VDD320TD7VTS1 = VDD, VTS0 = GND480TD8VTS1 = VDD, VTS0 = VDD640T
Output Pulse Low TimetL1-8Figure 15Tµs
Reset Pulse Width (Note 2)tRESETFigure 14.616.0ms
Setup TimetSETUPFigure 110µs
Start Pulse (Note 3)tSTARTFigure 1, TA = +25°C2.5µs
Delay Time from Trigger to
Ready (Note 4)tREADYFigure 1520ms
Glitch Immunity on I/O Input500ns
Time-Select Pin Logic LevelsIL0.8VIH2.3
I/O Output Voltage LowVOL
VDD > 4.5V, ISINK = 3.2mA0.4V
VDD > 2.7V, ISINK = 1.2mA0.3
I/O Input Voltage LowVIL0.8V
I/O Input Voltage HighVIH2.3V
MAX6575L/HSOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
Absolute Maximum RatingsStresses 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.
Electrical Characteristics
(VDD = +5V, TA = +25°C, unless otherwise noted.)
PINNAMEFUNCTIONVDDPositive Supply VoltageGNDGroundN.C.No Connect. Connect pin to GND or leave open.
4, 5TS0, TS1Time-Select Pins. Set the time delay factor by connecting TS1 and TS0 to either VDD or GND. See Table 1.I/OBidirectional Interface Pin. A time delay between when the part is initiated externally by pulling I/O low and when the part subsequently pulls I/O low, is proportional to absolute temperature (°K).
SAMPLE SIZE = 200-4-3-2-1012345
MAX6575 toc02
ACCURACY (°C)
PERCENTAG
E OF PARTS SAMPLED (%)
TEMPERATURE ACCURACY
(TA = +85°C)ACCURACY vs. TEMPERATURE
MAX6576 toc3a
TEMPERATURE (°C)
ACCURACY (°C)
SUPPLY CURRENT vs. TEMPERATURE
MAX6575 toc03b
SUPPLY CURRENT
(µA)
TEMPERATURE (°C)
+15°C/div
+100°C
+25°C
THERMAL STEP RESPONSE
IN PERFLUORINATED FLUIDMAX6575 toc04
5sec/div
MOUNTED ON 0.75 in.2
OF 2oz. COPPER
+12.5°C/div
+100°C
+25°C
THERMAL STEP RESPONSE
IN STILL AIRMAX6575 toc05
20sec/div
MOUNTED ON 0.75 in.2
OF 2oz. COPPER-4-3-2-1012345
TEMPERATURE ACCURACY
(TA = +25°C)MAX6575 toc01
ACCURACY (°C)
PERCENTAGE OF PARTS SAMPLED (%)
SAMPLE SIZE = 200
MAX6575L/HSOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
Typical Operating Characteristics
Pin Coniguration
Detailed DescriptionThe MAX6575L/H low-cost, low-current (150μA typ)
temperature sensor is ideal for interfacing with microcon
trollers or microprocessors. The MAX6575L/H is a mono-
stable, externally triggered temperature sensor that uses a Temp→Delay conversion to communicate with a μP over a single I/O line. Time-select pins (TS1, TS0) per-mit the internal temperature-controlled oscillator (TCO)
to be scaled by four preset timeout multipliers, allowing
eight separate temperature sensors to share one I/O line.
Different sensors on the same I/O line will use different
timeout multipliers to avoid overlapping signals.
Operating the MAX6575L/HFigure 1 illustrates the timing for the MAX6575L/H. When
the device is powered up, it assumes a ready state where
it awaits an external trigger at the I/O pin. The I/O pin
of the MAX6575L/H has an open-drain output structure
that requires a pullup resistor to maintain the proper logic
levels. Once the I/O pin is pulled low and then released,
control of the I/O pin is transferred to the MAX6575L/H.
The temperature conversion begins on the falling edge
of the externally triggered pulse. The I/O line is pulled
low at a later time. That time is determined by the device temperature and the Time Select pins (TS1, TS0). The I/O line remains low for 5Tμs, where T is the temperature
in degrees Kelvin. The temperature of the device is rep-
resented by the edgeto-edge delay of the externally trig-
gered pulse and the falling edge of the subsequent pulse
originating from the device. The device can be manually
reset by pulling the I/O line low for more than tRESET (16ms max). The device will automatically reset after a
maximum delay of 520ms, at which point it will again be
in a ready state awaiting a start pulse.
Definition of Terms:
tRESET: Time I/O must be externally pulled low to guar-
antee the MAX6575L/H is in a ready state await-ing external trigger. (Part will assume a ready state after 520ms without a reset pulse.)
tSETUP: Time I/O must be high prior to a start pulse.
tSTART: Trigger pulse which starts the on-chip timing
sequence on its falling edge.
tDx: Timing delay between the falling edge of the
start pulse and the falling edge initiated by CHIP#x.
tLx: I/O pulse low time (5Tμs).
tREADY: Time after falling edge of start pulse when the
MAX6575L/H will reset itself and await the next
external trigger.
The temperature, in degrees Celsius, may be calculated
as follows:
T(°C) = [tDx(μs) / timeout multiplier(μs/°K)] - 273.15°K
Table 1. Time-Select Pin Configuration
TIME-SELECT PINSTIMEOUT MULTIPLIERS (μs/°K)
TS1TS0MAX6575LMAX6575HGNDGND5160
GNDVDD20320
VDDGND40480
VDDVDD80640
tRESET
APPLIED START
PULSE
CHIP# 1
RESPONSE
CHIP# 2
RESPONSE
CHIP# 3
RESPONSE
CHIP# 4
RESPONSE
tD1
tL1tL2
tD2
tD3
tL3
tD4
tL4
tREADY
tSETUP
tSTART
MAX6575L/HSOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
Time-Select Pins (TS1, TS0)Table 1 shows the configuration of the Time-select pins for the MAX6575L/H. Each device allows four selectable
timeout multipliers intended to prevent overlapping when
multiple devices are used on the same I/O line. Tie TS1 and TS0 to either GND or VDD to select the desired tem-
perature 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 SelectionUnder extreme temperature conditions, it is possible for
an overlap to occur between the timeout delays of differ-
ent 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 avoid-
ed in multidrop configurations by selecting the appropriate
timeout multipliers. Table 2 illustrates the allowable tem-
perature 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
multipliers 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 mul-
tipliers 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 differential
extends over the entire 165°C range of the part.
Noise ConsiderationsThe accuracy of the MAX6575L/H timeout delay is sus-
ceptible 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 device’s
supply pin. Internal noise is inherent in the operation of
the device and is detailed in Table 3. Internal averag-
ing 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.
Table 2. Allowable Temperature Differential (°C)
Table 3. Typical Peak Noise Amplitude
TIMEOUT
MULTIPLIER
MAX6575LMAX6575H204080160320480640>165>165>165>165>165>165>16595.5>165>165>165>165>165132.0>165>165>165>165153.5>165>165>165
160>165>165>165
32070.2>165
PARAMETERMAX6575LMAX6575H
Timeout
Multiplier5204080160320480640
Noise
Amplitude (°C)
±0.33±0.15±0.15±0.098±0.091±0.063±0.043±0.037
MAX6575L/HSOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
Interfacing Multiple Devices
with a MicrocontrollerFigure 2 shows how to interface multiple MAX6575L/H
devices with an 8051 microcontroller. The first device, T1, is configured for a timeout multiplier of 40μs/°K, while the
second device, T2, is configured for a timeout multiplier of 80μs/°K to avoid overlap. The microcontroller takes in tem-
perature values from both sensors, T1 and T2, on a single port pin, P3.7. The microcontroller displays five times the temperature in degrees Celsius in binary on Port 1. A switch connected to a pull-up resistor at Port 3.5 selects
which temperature is displayed: open = T1, closed = T2.
Code is provided for this application as Listing 1.
Figure 2. Interfacing Multiple Devices with a Microcontroller
GND
TS0
TS1I/OI/O
0.1µFVDDVDD
+2.7V TO +5.5V+2.7V TO +5.5V
GNDX2
P3.7
P3.5
10kΩ
OPEN: T1
CLOSED: T2
470Ω (8)
VCC
VCC
10kΩ
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
12MHz
22pF
22pF
GNDT1TS080µs/°K40µs/°KTS1
0.1µF
P1.0
MAX6575LMAX6575LMAX6575L/HSOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
