MAX6682 Maxim Integrated Products, MAX6682 Datasheet

MAX6682

Manufacturer Part Number

MAX6682

Description

Thermistor-to-Digital Converter

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6682.pdf (9 pages)

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The MAX6682 converts an external thermistor’s temper-

ature-dependent resistance directly into digital form.

The thermistor and an external fixed resistor form a volt-

age-divider that is driven by the MAX6682’s internal

voltage reference. The MAX6682 measures the voltage

across the external resistor and produces a 10-bit +

sign output code dependent on that voltage.

The MAX6682 does not linearize the highly nonlinear

transfer function of a typical negative temperature coef-

ficient (NTC) thermistor, but it does provide linear out-

put data over limited temperature ranges when used

with an external resistor of the correct value. Over the

0° to +50°C temperature range, the MAX6682 produces

output data that is scaled to 8LSBs/°C (for 0.125°C res-

olution), provided that the correct thermistor and exter-

nal resistor values are used. Other temperature ranges

can be easily accommodated, but do not necessarily

yield data scaled to an even number of LSBs per

degree.

The 3-wire SPI™-compatible interface can be readily

connected to a variety of microcontrollers.

The MAX6682 is a read-only device, simplifying use in

systems where only temperature data is required.

Power-management circuitry reduces the average ther-

mistor current, minimizing self-heating. Between con-

versions, supply current is reduced to 21µA (typ). The

internal voltage reference is shut down between mea-

surements.

The MAX6682 is available in a small, 8-pin µMAX pack-

age and is specified over the -55°C to +125°C temper-

ature range.

19-2219; Rev 0; 2/02

Pin Configuration appears at end of data sheet.

SPI is a trademark of Motorola, Inc.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

HVAC

Medical Devices

Battery Packs/Chargers

Home Appliances

________________________________________________________________ Maxim Integrated Products

General Description

Applications

Thermistor-to-Digital Converter

o Converts Thermistor Temperature to Digital Data

o Low Average Thermistor Current Minimizes Self-

o Low Supply Current, 21µA (typ) Including 10kΩ

o Internal Voltage Reference Isolates Thermistor

o 10-Bit Resolution

o Accommodates Any Thermistor Temperature

o Output Data Scaled for Direct Temperature

o Simple SPI-Compatible Interface

o Small, 8-Pin µMAX Package

MAX6682MUA

Heating Errors

Thermistor Current

from Power-Supply Noise

Range

Readings from 0°C to +50°C

THERMISTOR

PART

EXT

Typical Operating Circuit

R+

R-

GND

-55°C to +125°C

MAX6682

TEMP RANGE

Ordering Information

3.3V

SCLK

0.1µF

PIN-PACKAGE

8 µMAX

I/O

SCLK

MISO

MC68HCXX

Features

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