MAX6575_VO1 [MAXIM]
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface;
| 型号： | MAX6575_VO1 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | SOT Temperature Sensor with Multidrop Single-Wire Digital Interface |
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SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
MAX6575L/H
General Description
Features
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 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.
● 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
Ordering Information
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.
PIN-
SOT
PART
TEMP.RANGE
PACKAGE TOP MARK
MAX6575LZUT -40°C to +125°C 6 SOT23
MAX6575HZUT -40°C to +125°C 6 SOT23
AABG
AABH
Selector Guide
Applications
TIMEOUT MULTIPLIERS
(µs/°K)
● Critical μP and μC Temperature Monitoring
● Portable Battery-Powered Equipment
● Cell Phones
PART
MAX6575L
MAX6575H
5, 20, 40, 80
● Battery Packs
160, 320, 480, 640
● Hard Drives/Tape Drives
● Networking and Telecom Equipment
● Medical Equipment
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+2.7V TO +5.5V
V
CC
0.1µF
0.1µF
V
V
DD
DD
0.1µF
MAX6575L
MAX6575H
TS1
TS0
TS1
TS0
CHIP #1
CHIP #8
V
CC
10kΩ
GND
GND
I/O
I/O
µP
I/O
GND
19-1485; Rev 2; 1/21
©
2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 © 2021 Analog Devices, Inc. All rights reserved.
|
|
MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
Continuous Power Dissipation (T = +70°C)
A
V
......................................................................-0.3V to +6V
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°C
Lead Temperature (soldering, 10s) ..................................+300°C
DD
TS1, TS0...............................................-0.3V to (V
I/O.........................................................................-0.3V to +6V
Input/Output Current, All Pins...........................................±20mA
+ 0.3V)
DD
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.
Electrical Characteristics
(V
= +2.7V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are specified at T = +25°C and V
= +5V,
DD
DD
A
A
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
T = -40°C to +85°C
MIN
TYP
MAX
5.5
UNITS
V
V
Range
2.7
V
DD
DD
150
250
A
I
Supply Current
V
=
5.5V
µA
DD
DD
T = -40°C to +125°C
A
400
+7.5
+5.5
+3.0
+4.5
+5.0
T = -20°C
A
-7.5
-5.5
-3.0
-4.5
-5.0
±1.1
±0.9
±0.8
±0.5
±0.5
5T
T = 0°C
A
Temperature Sensor Error
(Note 1)
T = +25°C
A
°C
T = +85°C
A
T = +125°C
A
t
V
V
V
V
= GND, V
= GND, V
=
=
GND
D1
TS1
TS1
TS1
TS1
TS1
TS1
TS1
TS1
TS0
TS0
MAX6575L,
T (temp) in °K,
Figure
t
V
DD
20T
40T
D2
t
V
DD TS0
=
, V
=
GND
D3
1
t
= V , V
DD TS0
= V
80T
D4
DD
Output Pulse Delay
µs
t
V
V
V
V
= GND, V
= GND, V
=
=
GND
160T
320T
480T
640T
5T
D5
TS0
TS0
MAX6575H,
T (temp) in °K,
Figure
t
V
D6
DD
t
V
DD TS0
=
, V
= GND
D7
1
t
= V
,
=
V
DD TS0
V
D8
DD
t
Output Pulse Low Time
Reset Pulse Width (Note 2)
Setup Time
Figure
Figure
Figure
1
1
1
µs
ms
µs
µs
L1-8
t
4.6
2.5
16.0
RESET
t
10
SETUP
t
Start Pulse (Note 3)
Figure 1, T = +25°C
A
START
Delay Time from Trigger to
Ready (Note 4)
t
Figure
1
520
0.8
ms
ns
READY
Glitch Immunity on I/O Input
500
V
IL
Time-Select Pin Logic Levels
V
V
V
2.3
2.3
IH
V
V
> 4.5V, I
> 2.7V, I
=
=
3.2mA
1.2mA
0.4
0.3
0.8
DD
SINK
V
I/O Output Voltage Low
OL
DD
SINK
V
I/O Input Voltage Low
I/O Input Voltage High
V
V
IL
V
IH
Note 1: See Temperature Accuracy histograms in Typical Operating Characteristics.
Note 2: Guaranteed by design. Not production tested.
Note 3: Limit maximum start pulse at 1ms to avoid timing overlap.
Note 4: If no reset pulse is applied.
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Typical Operating Characteristics
(V
= +5V, T = +25°C, unless otherwise noted.)
DD
A
TEMPERATURE ACCURACY
(T = +85°C)
TEMPERATURE ACCURACY
(T = +25°C)
A
ACCURACY vs. TEMPERATURE
A
35
30
25
20
15
10
5
1.5
1.0
0.5
0
40
SAMPLE SIZE = 200
SAMPLE SIZE = 200
35
30
25
20
15
10
5
-0.5
-1.0
0
0
-5 -4 -3 -2 -1
0
1
2
3
4
5
-5 -4 -3 -2 -1
0
1
2
3
4
5
-40 -25 -10
5
20 35 50 65 80 95 110 125
ACCURACY (°C)
ACCURACY (°C)
TEMPERATURE (°C)
THERMAL STEP RESPONSE
IN STILL AIR
THERMAL STEP RESPONSE
IN PERFLUORINATED FLUID
SUPPLY CURRENT vs. TEMPERATURE
MAX6575 toc04
MAX6575 toc05
190
180
170
160
150
140
130
120
+100°C
+100°
+12.5°C/div
+15°C/div
2
MOUNTED ON 0.75 in.
2
MOUNTED ON 0.75 in.
OF 2oz. COPPER
OF 2oz. COPPER
+25°C
+25°C
-40
-25 -10
5
20 35 50 65 80 95 110 125
5sec/div
20sec/div
TEMPERATURE (°C)
Pin Configuration
PIN
1
NAME
FUNCTION
V
Positive Supply Voltage
DD
2
GND
Ground
3
N.C.
No Connect. Connect pin to GND or leave open.
4, 5
TS0, TS1 Time-Select Pins. Set the time delay factor by connecting TS1 and TS0 to either V
or GND. See Table 1.
DD
Bidirectional 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).
6
I/O
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Table 1. Time-Select Pin Configuration
Detailed Description
The 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.
TIMEOUT MULTIPLIERS
TIME-SELECT PINS
(μs/°K)
TS1
GND
GND
TS0
MAX6575L
MAX6575H
160
GND
5
V
DD
GND
20
40
80
320
V
V
480
DD
DD
V
DD
640
maximum delay of 520ms, at which point it will again be
in a ready state awaiting a start pulse.
Operating the MAX6575L/H
Definition of Terms:
Figure 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
t
: Time I/O must be externally pulled low to
guarantee the MAX6575L/H is in a ready state
awaiting external trigger. (Part will assume a
ready state after 520ms without a reset pulse.)
: Time I/O must be high prior to a start pulse.
: Trigger pulse which starts the on-chip timing
sequence on its falling edge.
Timing delay between the falling edge of the
start pulse and the falling edge initiated by
CHIP#x.
RESET
t
t
SETUP
START
t
:
Dx
t
t
I/O pulse low time (5Tμs).
Lx:
: Time after falling edge of start pulse when the
MAX6575L/H will reset itself and await the next
external trigger.
READY
The temperature, in degrees Celsius, may be calculated
as follows:
reset by pulling the I/O line low for more than t
RESET
T(°C) = [t
/ timeout multiplier(μs/°K)] - 273.15°K
Dx(μs)
(16ms max). The device will automatically reset after a
Time-Select Pins (TS1, TS0)
CHIP# 1
RESPONSE
CHIP# 2
RESPONSE
CHIP# 3
RESPONSE
CHIP# 4
RESPONSE
APPLIED START
PULSE
t
SETUP
t
t
t
L3
t
L4
START
t
L2
L1
t
RESET
t
D1
t
D2
t
D3
t
D4
t
READY
Figure 1. Timing Diagram
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Table 2. Allowable Temperature Differential (°C)
MAX6575L
20
>165
MAX6575H
320
TIMEOUT
MULTIPLIER
5
40
80
160
>165
>165
>165
153.5
480
>165
>165
>165
>165
>165
70.2
640
>165
>165
>165
>165
>165
>165
37.9
5
>165
95.5
>165
>165
132.0
>165
>165
>165
>165
>165
20
40
80
160
320
480
640
Table 3. Typical Peak Noise Amplitude
PARAMETER
MAX6575L
MAX6575H
Timeout
Multiplier
5
20
40
80
160
320
480
640
Noise
Amplitude
(°C)
±0.33
±0.15
±0.15
±0.098
±0.091
±0.063
±0.043
±0.037
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
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.
and TS0 to either GND or V
to select the desired tem-
DD
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
Noise Considerations
Timeout Selection
The 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.
Under 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.
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
+2.7V TO +5.5V
+2.7V TO +5.5V
0.1µF
0.1µF
V
DD
V
DD
MAX6575L
MAX6575L
TS1
TS1
I/O
I/O
40µs/°K
80µs/°K
T1
T2
TS0
TS0
GND
GND
V
CC
470Ω (8)
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
10kΩ
P3.7
8051
V
CC
P1.6
P1.7
10kΩ
OPEN: T1
CLOSED: T2
P3.5
22pF
12MHz
22pF
X1
X2
GND
Figure 2. Interfacing Multiple Devices with a Microcontroller
Interfacing Multiple Devices
with a Microcontroller
Figure 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.
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Listing 1. 8051 Code Example
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Listing 1. 8051 Code Example (continued)
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Listing 1. 8051 Code Example (continued)
Pin Configuration
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS
status.
TOP VIEW
V
1
2
3
6
5
4
I/O
DD
MAX6575L
MAX6575H
TS1
TS0
GND
N.C.
LAND
PATTERN
NO.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
6 SOT23
U6-4
21-0058
90-0175
ꢀꢁꢂꢃꢄꢅ6
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MAX6575L/H
SOT Temperature Sensor with Multidrop
Single-Wire Digital Interface
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
2
4/99
11/14
1/21
Initial release
—
1
Removed automotive reference from data sheet
Updated Pin Configuration
9
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is
assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that
may result from its use.Specifications subject to change without notice. No license is granted by implicationor
otherwise under any patent or patent rights of Analog Devices. Trademarks andregistered trademarks are the
property of their respective owners.
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