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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

♦ 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

MAX6575L/H

SOT Temperature Sensor with

Multidrop Single-Wire Digital Interface

________________________________________________________________

Maxim Integrated Products

19-1485; Rev 0; 4/99

PART

MAX6575LZUT -40°C to +125°C

TEMP. RANGE

PIN-

PACKAGE

6 SOT23

Ordering Information

Selector Guide

SOT

TOP MARK

AABG

MAX6575HZUT AABH-40°C to +125°C 6 SOT23

TIMEOUT MULTIPLIERS

(µs/°K)

MAX6575L 5, 20, 40, 80

MAX6575H 160, 320, 480, 640

PART

Pin Configurations appear at end of data sheet.

GND

TS0

TS1

I/O

0.1µF

MAX6575L

CHIP #1 CHIP #8

10k

+2.7V TO +5.5V

GND

TS0

TS1

I/O

0.1µF

MAX6575H

µP

I/O

GND

Typical Operating Circuit

Summary of content (12 pages)

PAGE 1
9-1485; Rev 0; 4/99 SOT Temperature Sensor with Multidrop Single-Wire Digital Interface 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 microprocessor (µP) to interface with up to eight temperature sensors using a single control line.
PAGE 2
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface ABSOLUTE MAXIMUM RATINGS 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°C Lead Temperature (soldering, 10sec) .............................+300°C Terminal Voltage (with respect to GND) VDD ..................................................
PAGE 3
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface TEMPERATURE ACCURACY (TA = +85°C) 20 15 10 5 -5 -4 -3 -2 -1 0 1 2 3 4 MAX6576 toc3a 1.0 30 25 20 15 10 0.5 0 -0.5 5 -1.0 0 0 -5 -4 5 -3 -2 -1 0 1 2 3 4 -40 -25 -10 5 20 35 50 65 80 95 110 125 5 ACCURACY (°C) ACCURACY (°C) TEMPERATURE (°C) SUPPLY CURRENT vs.
PAGE 4
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface _______________Detailed Description Table 1. Time-Select Pin Configuration The MAX6575L/H low-cost, low-current (150µA typ) temperature sensor is ideal for interfacing with microcontrollers or microprocessors. The MAX6575L/H is a monostable, externally triggered temperature sensor that uses a Temp→Delay conversion to communicate with a µP over a single I/O line.
PAGE 5
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface MAX6575L/H Table 2. Allowable Temperature Differential (°C) TIMEOUT MULTIPLIER MAX6575L 5 5 MAX6575H 20 40 80 160 320 480 640 >165 >165 >165 >165 >165 >165 >165 95.5 >165 >165 >165 >165 >165 132.0 >165 >165 >165 >165 153.5 >165 >165 >165 >165 >165 >165 70.2 >165 20 40 80 160 320 480 37.9 640 Table 3.
PAGE 6
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface +2.7V TO +5.5V +2.7V TO +5.5V 0.1µF VDD 40µs/°K TS1 MAX6575L I/O T1 TS0 0.1µF VDD 80µs/°K TS1 MAX6575L I/O T2 TS0 GND GND VCC 470Ω (8) P1.0 10k P1.1 P3.7 8051 VCC P1.2 P1.3 P1.4 P1.5 P1.6 10k OPEN: T1 CLOSED: T2 P1.7 P3.5 22pF X1 12MHz GND X2 22pF Figure 2.
PAGE 7
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface MAX6575L/H Listing 1.
PAGE 8
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Listing 1.
PAGE 9
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface MAX6575L/H Listing 1. 8051 Code Example (continued) Pin Configuration Chip Information TRANSISTOR COUNT: 302 TOP VIEW VDD 1 GND 2 MAX6575L MAX6575H N.C.
PAGE 10
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface 6LSOT.
PAGE 11
SOT Temperature Sensor with Multidrop Single-Wire Digital Interface ______________________________________________________________________________________ MAX6575L/H NOTES 11
PAGE 12
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface NOTES Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.