MAX6691_07 MAXIM [Maxim Integrated Products], MAX6691_07 Datasheet

MAX6691_07

Manufacturer Part Number

MAX6691_07

Description

Four-Channel Thermistor Temperature-to-Pulse-Width Converter

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6691_07.pdf (7 pages)

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The MAX6691 four-channel thermistor temperature-to-

pulse-width converter measures the temperatures of up

to four thermistors and converts them to a series of out-

put pulses whose widths are related to the thermistors’

temperatures. Each of the four thermistors and an

external fixed resistor (R

is driven by the MAX6691’s internal voltage reference

sured and converted to a pulse.

The MAX6691 has a single open-drain I/O pin that can

be readily connected to a variety of microcontrollers.

The microcontroller initiates a conversion by pulling the

I/O pin low and releasing it. When conversion is done,

the MAX6691 signals the end of conversion by pulling

the I/O pin low once again. The pulse corresponding to

the first thermistor is sent immediately after the release

of the I/O pin.

The on-chip power-management circuitry reduces the

average thermistor current to minimize errors due to

thermistor self-heating. Between conversions, the

MAX6691 falls into a 10µA (max) sleep mode, where

the voltage reference is disabled and the supply cur-

rent is at its minimum.

The MAX6691 is available in a 10-pin µMAX package

and is specified from -55°C to +125°C temperature

range.

19-2304; Rev 1; 2/07

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.

Four-Channel Thermistor Temperature-to-Pulse-

REF

). V

TOP VIEW

HVAC

Home Appliances

Medical Devices

REF

Typical Application Circuit

and the voltage across R

________________________________________________________________ Maxim Integrated Products

R-

General Description

EXT

MAX6691

) form a voltage-divider that

EXT

Applications

R+

GND

I/O

N.C.

EXT

10k

CONTROLLER

are mea-

MICRO-

♦ Simple Single-Wire Interface

♦ Measures Up to Four Thermistor Temperatures

♦ Low-Average Thermistor Current Minimizes Self-

♦ Internal Voltage Reference Isolates Thermistor

♦ Accommodates Any Thermistor Temperature

MAX6691MUB

Heating Errors

from Power-Supply Noise

Range

TOP VIEW

PART

Width Converter

-55 C to +125 C

R-

TEMP RANGE

Ordering Information

MAX6691

MAX

Pin Configuration

10 µMAX

PIN-

PACKAGE

I/O

N.C.

GND

R+

Features

CODE

U10-2

PKG

Related parts for MAX6691_07

MAX6691_07 Summary of contents

Page 1

Rev 1; 2/07 Four-Channel Thermistor Temperature-to-Pulse- General Description The MAX6691 four-channel thermistor temperature-to- pulse-width converter measures the temperatures four thermistors and converts them to a series of out- put pulses whose widths are related to the ...

Page 2

Four-Channel Thermistor Temperature-to-Pulse- Width Converter ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.0V CC All Other Pins to GND.................................-0. I/O, R+, R-, T1–T4 Current................................................±20mA ESD Protection (Human Body Model) .............................±2000V Continuous Power Dissipation (T = +70°C) A ...

Page 3

Four-Channel Thermistor Temperature-to-Pulse- __________________________________________Typical Operating Characteristics ( 12. EXT TH SLEEP-MODE SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.5 4.0 3.5 3.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) ...

Page 4

Four-Channel Thermistor Temperature-to-Pulse- Width Converter t CONV t t START READY CONV REQUEST, DATA READY, PULLED LOW BY C PULLED LOW BY MAX6691 Figure 1. Timing Diagram Detailed Description The MAX6691 is an interface circuit that energizes up to four ...

Page 5

Four-Channel Thermistor Temperature-to-Pulse- THERMISTOR RESISTANCE vs. TEMPERATURE 120 100 -40 - TEMPERATURE ( C) Figure 2. Thermistor Resistance vs. Temperature T /T vs. TEMPERATURE FOR BETATHERM HIGH LOW 10K3A1 THERMISTOR WITH ...

Page 6

Four-Channel Thermistor Temperature-to-Pulse- Width Converter Table 1. Standard Thermistors MANUFACTURER PART Betatherm 10K3A1 Dale 1M1002 Thermometrics C100Y103J bypass V to GND by placing a 0.1µF to 1.0µF CC ceramic bypass capacitor close to the supply pin of the devices. Thermal ...

Page 7

Four-Channel Thermistor Temperature-to-Pulse Ø 0.50±0.1 0.6±0.1 1 0.6±0.1 TOP VIEW FRONT VIEW Revision History Pages changed at Rev Maxim cannot assume responsibility for use of any circuitry other than circuitry ...

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