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Data Sheet

FULL DATA SHEET (PDF, 172kB) Download   E-Mail

Description

The MAX6682 converts an external thermistor's temperature-dependent resistance directly into digital form. The thermistor and an external fixed resistor form a voltage-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 coefficient (NTC) thermistor, but it does provide linear output data over limited temperature ranges when used with an external resistor of the correct value. Over the 0°C to +50°C temperature range, the MAX6682 produces output data that is scaled to 8 LSBs/°C (for 0.125°C resolution), provided that the correct thermistor and external 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 thermistor current, minimizing self-heating. Between conversions, supply current is reduced to 21µA (typ). The internal voltage reference is shut down between measurements. The MAX6682 is available in a small, 8-pin µMAX package and is specified over the -55°C to +125°C temperature range.

Key Features		Applications/Uses
Converts Thermistor Temperature to Digital Data Low Average Thermistor Current Minimizes Self-Heating Errors Low Supply Current, 21µA (typ) Including 10kΩ Thermistor Current Internal Voltage Reference Isolates Thermistor from Power-Supply Noise 10-Bit Resolution Accommodates Any Thermistor Temperature Range Output Data Scaled for Direct Temperature Readings from 0°C to +50°C Simple SPI-Compatible Interface Small, 8-Pin µMAX Package		Battery Packs/Chargers Home Appliances HVAC Medical Devices

Diagram

Typical Operating Circuit

Design Guides

Thermal Management (PDF)

Reliability Reports

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Software/Models

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Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-4 of 4

MAX6682	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6682MUA			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6682MUA-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6682MUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6682MUA+T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2002-03-27  Temperature Family by Product Type

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