MAX6576_V01 [MAXIM]
SOT Temperature Sensors with Period/Frequency Output;
| 型号： | MAX6576_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | SOT Temperature Sensors with Period/Frequency Output |
| 文件： | 总9页 (文件大小：1998K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
General Description
Features
● Simple Single-Wire Output
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 tempera-
ture. 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.
● Two Output Types Available
• Temperature to Period (μs) (MAX6576)
• Temperature to Frequency (Hz) (MAX6577)
● ±0.8°C Accuracy at +25°C (±3°C max)
● No External Components
● Operates from +2.7V to +5.5V Supply Voltage
● Low 140μA Typical Supply Current
● Standard Operating Temperature Range:
Both devices feature a single-wire output that minimizes
the number of pins necessary to interface with a micropro-
cessor. The period/frequency range of the output square
wave can be selected by hard-wiring the two time-select
-40°C to +125°C
● Small 6-Pin SOT23 Package
pins (TS0, TS1) to either V
or GND. The MAX6576/
DD
MAX6577 are available in space-saving 6-pin SOT23
packages.
Ordering Information
Applications
PIN-
PACKAGE
SOT TOP
MARK
● Critical μP and μC Temperature Monitoring
● Portable Battery-Powered Equipment
● Cell Phones
PART
TEMP. RANGE
MAX6576ZUT -40°C to +125°C 6 SOT23
MAX6577ZUT -40°C to +125°C 6 SOT23
AABI
● Battery Packs
AABJ
● Hard Drives/Tape Drives
● Networking and Telecom Equipment
● Medical Equipment
Pin Configuration
Typical Operating Circuit
TOP VIEW
+2.7V TO +5.5V
0.1µF
0.1µF
V
V
CC
DD
V
1
2
3
6
5
4
OUT
TS1
TS0
DD
MAX6576
MAX6577
µP
I/O
MAX6576
MAX6577
GND
N.C.
TS1
TS0
GND
GND
OUT
SOT23-6
19-1484; Rev 1; 10/14
MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
Operating Temperature Range...........................-40°C to +125°C
Storage Temperature Range..............................-65°C to +150°C
Lead Temperature (soldering, 10sec)...............................+300°C
V
.......................................................................-0.3V to +6V
DD
TS1, TS0, OUT.......................................-0.3V to (V
+ 0.3V)
DD
Input/Output Current, All Pins............................................±20mA
Continuous Power Dissipation (T = +70°C)
A
6-pin SOT23 (derate 7.10mW/°C above +70°C)..........571mW
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
MIN
TYP
MAX UNITS
V
Range
V
2.7
5.5
V
DD
DD
T
T
T
T
T
T
T
T
T
T
T
T
= -40°C to +85°C
= -40°C to +125°C
= -20°C
140
250
A
A
A
A
A
A
A
A
A
A
A
A
Supply Current
I
V
= 5.5V
µA
DD
DD
400
-7.5
-5.5
-3.0
-4.5
-5.0
-7.5
-6.5
-3.0
-3.5
-4.5
±1.1
±0.9
±0.8
±0.5
±0.5
±1.1
±0.9
±0.8
±0.5
±0.5
10T
40T
160T
640T
4T
+7.5
+5.5
+3.0
+4.5
+5.0
+7.5
+6.5
+3.0
+3.5
+4.5
= 0°C
MAX6576
MAX6577
= +25°C
°C
°C
= +85°C
= +125°C
= -20°C
Temperature Sensor
Error (Note 1)
= 0°C
= +25°C
= +85°C
= +125°C
V
V
V
V
V
V
V
V
= GND, V
= GND, V
= GND
TS1
TS1
TS1
TS1
TS1
TS1
TS1
TS1
TS0
MAX6576,
T (temp) in °K,
Figure 1
= V
TS0
DD
Output Clock Period
t
f
µs
OUT
OUT
= V , V
= GND
DD TS0
= V , V
= V
DD
DD TS0
= GND, V
= GND
TS0
TS0
MAX6577,
T (temp) in °K,
Figure 2
= GND, V
= V , V
= V
1T
DD
Output Clock Frequency
OUT Duty Cycle (Note 2)
Hz
= GND
T/4
DD TS0
= V , V
= V
T/16
0.5
DD TS0
DD
V
0.8
IL
Time-Select Pin Logic Levels
V
V
V
2.3
IH
V
V
V
V
> 4.5V, I
> 2.7V, I
> 4.5V, I
> 2.7V, I
= 3.2mA
= 1.2mA
= 800μA
= 500μA
0.4
0.3
DD
DD
DD
DD
SINK
SINK
SRC
SRC
V
OL
OUT Voltage
V
- 1.5
DD
DD
V
OH
0.8V
Note 1: See the Temperature Accuracy histograms in the Typical Operating Characteristics.
Note 2: The output duty cycle is guaranteed to be 50% by an internal flip-flop.
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
Typical Operating Characteristics
(V
= +5V, T = +25°C, unless otherwise noted.)
A
DD
TEMPERATURE ACCURACY
TEMPERATURE ACCURACY
(T = +85°C)
(T = +25°C)
A
A
60
35
SAMPLE SIZE = 200
SAMPLE SIZE = 200
MAX6576
MAX6577
MAX6576
MAX6577
30
50
40
30
20
10
0
25
20
15
10
5
0
-5 -4 -3 -2 -1
0
1
2
3
4
5
-5 -4 -3 -2 -1
0
1
2
3
4
5
ACCURACY (°C)
ACCURACY (°C)
SUPPLY CURRENT vs. TEMPERATURE
ACCURACY vs. TEMPERATURE
180
170
1.5
1.0
0.5
0
160
150
140
130
120
110
MAX6576
MAX6577
MAX6577
-0.5
-1.0
MAX6576
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
100
-40 -25 -10
5
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
THERMAL STEP RESPONSE
IN PERFLUORINATED FLUID
THERMAL STEP RESPONSE
IN STILL AIR
MAX6576/77 toc05
MAX6576/77 toc06
+100°C
+100°C
+15°C/div
+12.5°C/div
2
2
MOUNTED ON 0.75 in.
OF 2oz. COPPER
MOUNTED ON 0.75 in.
OF 2oz. COPPER
+25°C
+25°C
5sec/div
20sec/div
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
Pin Description
PIN
1
NAME
FUNCTION
V
Positive Supply Voltage
DD
2
GND
Ground
3
N.C.
No Connection. Connect pin to GND or leave open.
Time-Select Pins. TS1 and TS0 set the temperature scale factor by connecting TS1 and TS0 to either V
or GND. See Tables 1 and 2.
DD
4, 5
6
TS1, TS0
OUT
Square-Wave Output with a Clock Period Proportional to Absolute Temperature (°K) (MAX6576)
Square-Wave Output with a Clock Frequency Proportional to Absolute Temperature (°K) (MAX6577)
Table 1. MAX6576 Time-Select Pin
Configuration
Table 2. MAX6577 Time-Select Pin
Configuration
TS1
GND
GND
TS0
SCALAR MULTIPLIER (μs/°K)
TS1
GND
GND
TS0
SCALAR MULTIPLIER (Hz/°K)
GND
10
40
GND
4
1
V
V
DD
DD
V
V
GND
160
640
V
V
GND
1/4
1/16
DD
DD
DD
DD
V
V
DD
DD
Note: The temperature, in °C, may be calculated as follows:
Note: The temperature, in °C, may be calculated as follows:
PERIOD(µs)
FREQUENCY(µs)
T(°C) =
− 273.15°K
T(°C) =
− 273.15°K
SCALAR MULTIPLIER(µs/°K)
SCALAR MULTIPLIER(µs/°K)
to the absolute temperature (°K) of the device (Figure 1).
The MAX6576 has a push/pull CMOS output with sharp
edges. The speed of the output square wave can be
selected by hard-wiring TS1 and TS0 as shown in Table 1.
One of four scaled output periods can be selected using
TS1 and TS0.
Detailed Description
The MAX6576/MAX6577 low-cost, low-current (140μA
typ) temperature sensors are ideal for interfacing with
microcontrollers (μCs) or microprocessors (μPs). The
MAX6576 converts ambient temperature into a 50%
dutycycle square wave with a period proportional to
absolute temperature. The MAX6577 converts ambient
temperature into a 50% duty-cycle square wave with a
frequency proportional to absolute temperature. Time-
select pins (TS1, TS0) permit the internal temperature-
controlled oscillator (TCO) to be scaled by four preset
multipliers. The MAX6576/MAX6577 feature a single-wire
interface to minimize the number of port pins necessary
for interfacing with a μP.
MAX6577 Characteristics
The MAX6577 temperature sensor converts temperature
to frequency. The output of the device is a free-running,
50% duty-cycle square wave with a frequency that is pro-
portional to the absolute temperature (°K) of the device
(Figure 2). The MAX6577 has a push/pull CMOS output
with sharp edges. The speed of the output square wave
can be selected by hard-wiring TS1 and TS0 as shown
in Table 2. One of four scaled output frequencies can be
selected using TS1 and TS0.
MAX6576 Characteristics
The MAX6576 temperature sensor converts temperature
to period. The output of the device is a free-running, 50%
duty-cycle square wave with a period that is proportional
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
MAX6576
CLOCK WAVEFORM OUTPUT
MAX6577
CLOCK WAVEFORM OUTPUT
t
t
f
= 1 / t
OUT
OUT
OUT
OUT
f
(°K)
OUT
Figure 1. MAX6576 Timing Diagram
Figure 2. MAX6577 Timing Diagram
V
to select a scalar multiplier of 1Hz/°K. The MAX6577
DD
Applications Information
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 provides the code for this application. The
interface is similar for the MAX6576, except the μC will
perform a period measurement.
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.
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 operation of the
devices and is detailed in Table 3. Internal averaging mini-
mizes 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.
Figure 4 shows a quick-look application circuit for the
MAX6577 using a universal counter measuring frequency.
TS1 is tied to ground and TS0 is tied to V
to select a
DD
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. 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
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
+2.7V TO +5.5V
V
CC
470Ω x 8
0.1µF
V
P1.0
DD
UNIVERSAL COUNTER
"PERIOD"
P1.1
P1.2
P1.3
P1.4
P1.5
MAX6576
+2.7V TO +5.5V
TS0
OUT
TS1
0.1µF
GND
V
DD
MAX6577
P1.6
P1.7
TS0
OUT
T0
TS1
22pF
12MHz
22pF
Figure 3. MAX6576 Quick-Look Circuit
GND
X1
X2
8051
GND
+2.7V TO +5.5V
0.1µF
UNIVERSAL COUNTER
V
DD
Figure 5. Interfacing with a μC
MAX6577
TS0
TS1
"FREQUENCY"
OUT
GND
Chip Information
TRANSISTOR COUNT: 302
Figure 4. MAX6577 Quick-Look Circuit
Table 3. Typical Peak Noise Amplitude
PARAMETER
Scalar Multiplier
MAX6576
MAX6577
10
40
160
640
4
1
1/4
1/16
±0.028
Noise Amplitude (°C)
±0.38
±0.17
±0.11
±0.094
±0.13
±0.066
±0.040
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
Listing 1. 8051 Code Example
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
Listing 1. 8051 Code Example (continued)
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.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
90-0175
6 SOT23
U6-4
21-0058
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MAX6576/MAX6577
SOT Temperature Sensors with
Period/Frequency Output
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
4/99
Initial release
Removed automotive reference from data sheet
—
1
10/14
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
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