Datasheet

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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 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.

19-1485; Rev 1; 11/14

PART TEMP.RANGE

PIN-

PACKAGE

SOT

TOP MARK

MAX6575LZUT -40°C to +125°C 6 SOT23 AABG

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

PART

TIMEOUT

MULTIPLIERS

(µs/°K)

MAX6575L

5, 20, 40,

MAX6575H

160, 320, 480,

640

GND

TS0

TS1

MAX6575L MAX6575H

I/O

0.1µF

0.1µF 0.1µF

CHIP #1 CHIP #8

10kΩ

+2.7V TO +5.5V

GND

TS0

TS1

I/O

µP

I/O

GND

MAX6575L/H SOT Temperature Sensor with

Multidrop Single-Wire Digital Interface

Typical Operating Circuit

Ordering Information

Selector Guide

Summary of content (10 pages)

PAGE 1
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface 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.
PAGE 2
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Absolute Maximum Ratings Terminal Voltage (with respect to GND) VDD......................................................................-0.3V to +6V TS1, TS0...............................................-0.3V to (VDD + 0.3V) I/O.........................................................................-0.3V to +6V Input/Output Current, All Pins...........................................
PAGE 3
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Typical Operating Characteristics (VDD = +5V, TA = +25°C, unless otherwise noted.) TEMPERATURE ACCURACY (TA = +85°C) 20 15 10 5 0 -5 -4 0 1 2 4 25 20 15 10 0 -5 -4 5 MAX6576 toc3a 0.5 0 -0.5 5 -3 -2 -1 0 1 2 3 4 -1.0 5 -40 -25 -10 5 20 35 50 65 80 95 110 125 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 microcon trollers 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
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface 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 >165 >165 >165 >165 >165 132.0 >165 >165 >165 >165 153.5 >165 >165 >165 >165 >165 >165 70.2 >165 20 95.5 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 MAX6575L 40µs/°K TS1 MAX6575L I/O TS0 0.1µF VDD T1 80µs/°K TS1 I/O TS0 T2 GND GND VCC P1.0 10kΩ 470Ω (8) P1.1 P3.7 8051 VCC P1.2 P1.3 P1.4 P1.5 OPEN: T1 CLOSED: T2 P1.6 10kΩ P1.7 P3.5 22pF X1 12MHz GND X2 22pF Figure 2.
PAGE 7
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Listing 1. 8051 Code Example www.maximintegrated.
PAGE 8
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Listing 1. 8051 Code Example (continued) www.maximintegrated.
PAGE 9
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Listing 1. 8051 Code Example (continued) Pin Configuration Package Information TOP VIEW VDD 1 4 GND 2 MAX6575L MAX6575H 5 TS1 N.C. 3 4 TS0 I/O 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.
PAGE 10
MAX6575L/H SOT Temperature Sensor with Multidrop Single-Wire Digital Interface Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 4/99 Initial release — 1 11/14 Removed automotive reference from data sheet 1 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.