MAX6682MUA+ Maxim Integrated Products, MAX6682MUA+ Datasheet

IC THERMISTOR TO DGTL 8UMAX

MAX6682MUA+

Manufacturer Part Number
MAX6682MUA+
Description
IC THERMISTOR TO DGTL 8UMAX
Manufacturer
Maxim Integrated Products
Type
Temperature Sensorr
Datasheet
1.MAX6682MUA.pdf (9 pages)

Specifications of MAX6682MUA+

Input Type
Logic
Output Type
Logic
Interface
3-Wire SPI Serial
Current - Supply
29µA
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Full Temp Accuracy
+/- 0.5 C
Digital Output - Bus Interface
3-Wire, SPI
Digital Output - Number Of Bits
10 bit
Supply Voltage (max)
5.5 V
Supply Voltage (min)
3 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Supply Current
21 uA
Ic Output Type
Digital
Sensing Accuracy Range
± 0.5°C
Temperature Sensing Range
-55°C To +125°C
Supply Voltage Range
3V To 5.5V
Resolution (bits)
10bit
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
R
EXT
Typical Operating Circuit
R+
R-
GND
-55°C to +125°C
MAX6682
TEMP RANGE
Ordering Information
SCLK
3.3V
V
CC
CS
SO
0.1µF
PIN-PACKAGE
8 µMAX
I/O
SCLK
MISO
MC68HCXX
Features
1

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MAX6682MUA+ Summary of contents

Page 1

... Battery Packs/Chargers Home Appliances Pin Configuration appears at end of data sheet. SPI is a trademark of Motorola, Inc. ________________________________________________________________ Maxim Integrated Products 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. Thermistor-to-Digital Converter o Converts Thermistor Temperature to Digital Data ...

Page 2

Thermistor-to-Digital Converter ABSOLUTE MAXIMUM RATINGS Supply Voltage (V to GND) .................................-0.3V to +6V CC SO, SCK, CS, R GND ....................-0. Current ........................................................................±20mA R- Current ...........................................................................±1mA SCK, CS, SO Current .........................................-1mA to +50mA ESD Protection (Human ...

Page 3

TIMING CHARACTERISTICS ( 5.5V unless otherwise noted. Typical values are specified MIN MAX PARAMETER SYMBOL SERIAL INTERFACE TIMING (Figures 5 and 6) Serial Clock Frequency SCK Pulse ...

Page 4

Thermistor-to-Digital Converter PIN NAME 1 I.C. Internally Connected. Connect to GND or leave unconnected Reference Voltage Output. External resistor positive input. External Resistor Negative Input. Connect R- to the junction of the external resistor and the 3 R- ...

Page 5

Table 1. Temperature vs. Digital Output for Standard Thermistor with R V REXT THERMISTOR THERMISTOR AND R TEMPERATURE (°C) +60.000 +50.000 +40.000 +30.000 +25.000 +20.000 +10.000 0 -0.725 -2.000 -5.000 *Assumes V = 1.220V. R+ NTC thermistor is very nonlinear ...

Page 6

Thermistor-to-Digital Converter THERMISTOR NONLINEARITY vs. TEMPERATURE 0.25 0.20 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0. TEMPERATURE (°C) Figure 3. Thermistor Nonlinearity vs. Temperature for a Standard Thermistor from +10°C to +40°C ...

Page 7

NTC thermistor in series with a 5110Ω resistor operating at +40°C with a constant 5V bias one of the standard thermistors in Table 2, its resistance is 5325Ω at this temperature. The ...

Page 8

Thermistor-to-Digital Converter SCK t DV B10 SO B9 MSB Figure 6. Serial Interface Timing 2 Functional Diagram _______________________________________________________________________________________ 11 t HIZ LSB TOP VIEW BANDGAP CS DIGITAL SCK CONTROL ...

Page 9

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2002 Maxim Integrated Products ...

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