Datasheet

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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 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.

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

pins (TS0, TS1) to either V

or GND. The MAX6576/

MAX6577 are available in space-saving 6-pin SOT23

packages.

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 Output

● 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:

-40°C to +125°C

● Small 6-Pin SOT23 Package

19-1484; Rev 1; 10/14

PART TEMP. RANGE

PIN-

PACKAGE

SOT TOP

MARK

MAX6576ZUT -40°C to +125°C 6 SOT23 AABI

MAX6577ZUT -40°C to +125°C 6 SOT23 AABJ

GND

TS0N.C.

1 6 OUT

5 TS1

SOT23-6

TOP VIEW

3 4

MAX6576

MAX6577

+2.7V TO +5.5V

GND

TS0

TS1

OUT

0.1µF0.1µF

µP

GND

I/O

MAX6576

MAX6577

MAX6576/MAX6577 SOT Temperature Sensors with

Period/Frequency Output

Pin Conguration Typical Operating Circuit

Ordering Information

Summary of content (9 pages)

PAGE 1
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output General Description The MAX6576/MAX6577 are low-cost, low-current temperature 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.
PAGE 2
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output Absolute Maximum Ratings Terminal Voltage (with respect to GND) VDD.......................................................................-0.3V to +6V TS1, TS0, OUT.......................................-0.3V to (VDD + 0.3V) Input/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........
PAGE 3
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output Typical Operating Characteristics MAX6576 MAX6577 30 25 20 15 10 5 0 -5 -4 -3 -2 -1 0 1 2 3 4 60 40 30 20 10 SUPPLY CURRENT vs. TEMPERATURE MAX6576/77toc03 160 MAX6576 140 130 120 MAX6577 110 100 1.5 0 1 2 3 4 5 ACCURACY vs. TEMPERATURE 1.
PAGE 4
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output Pin Description PIN NAME 1 VDD Positive Supply Voltage FUNCTION 2 GND Ground 3 N.C. No Connection. Connect pin to GND or leave open. 4, 5 TS1, TS0 6 OUT Time-Select Pins. TS1 and TS0 set the temperature scale factor by connecting TS1 and TS0 to either VDD or GND. See Tables 1 and 2.
PAGE 5
MAX6576/MAX6577 MAX6576 CLOCK WAVEFORM OUTPUT tOUT SOT Temperature Sensors with Period/Frequency Output MAX6577 CLOCK WAVEFORM OUTPUT tOUT fOUT = 1 / tOUT fOUT (°K) Figure 1. MAX6576 Timing Diagram Figure 2. MAX6577 Timing Diagram Applications Information 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.
PAGE 6
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output +2.7V TO +5.5V 0.1µF 470Ω x 8 VDD MAX6576 TS0 VCC P1.0 UNIVERSAL COUNTER P1.1 +2.7V TO +5.5V P1.2 "PERIOD" OUT TS1 P1.3 GND P1.4 0.1µF VDD P1.5 MAX6577 TS0 OUT P1.6 T0 P1.7 TS1 Figure 3. MAX6576 Quick-Look Circuit 22pF GND X1 8051 GND +2.7V TO +5.5V VDD MAX6577 TS0 0.1µF UNIVERSAL COUNTER 12MHz X2 22pF Figure 5.
PAGE 7
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output Listing 1. 8051 Code Example www.maximintegrated.
PAGE 8
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.
PAGE 9
MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output Revision History REVISION NUMBER REVISION DATE 0 4/99 Initial release — 1 10/14 Removed automotive reference from data sheet 1 DESCRIPTION PAGES CHANGED 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.