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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6682 Datasheet

Thermistor-to-Digital Converter

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MAX6682 pdf
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19-2219; Rev 0; 2/02
Thermistor-to-Digital Converter
General Description
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.
HVAC
Medical Devices
Battery Packs/Chargers
Home Appliances
Applications
Pin Configuration appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
Features
o Converts Thermistor Temperature to Digital Data
o Low Average Thermistor Current Minimizes Self-
Heating Errors
o Low Supply Current, 21µA (typ) Including 10k
Thermistor Current
o Internal Voltage Reference Isolates Thermistor
from Power-Supply Noise
o 10-Bit Resolution
o Accommodates Any Thermistor Temperature
Range
o Output Data Scaled for Direct Temperature
Readings from 0°C to +50°C
o Simple SPI-Compatible Interface
o Small, 8-Pin µMAX Package
PART
MAX6682MUA
Ordering Information
TEMP RANGE
-55°C to +125°C
PIN-PACKAGE
8 µMAX
Typical Operating Circuit
3.3V
0.1µF
VCC
REXT
THERMISTOR
R+
MAX6682
R-
CS
SCLK
GND SO
MC68HCXX
I/O
SCLK
MISO
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6682 Datasheet

Thermistor-to-Digital Converter

No Preview Available !

MAX6682 pdf
Thermistor-to-Digital Converter
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to GND) .................................-0.3V to +6V
SO, SCK, CS, R-, R+ to GND ....................-0.3V to (VCC + 0.3V)
R+ Current ........................................................................±20mA
R- Current ...........................................................................±1mA
SCK, CS, SO Current .........................................-1mA to +50mA
ESD Protection (Human Body Model) .............................±2000V
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) ............ 328mW
Operating Temperature Range
(TMIN to TMAX) ...............................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature .....................................................+150°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 3V to 5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are specified at VCC = 3.3V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
ADC Total Unadjusted Error
ADC Conversion Time
R- Input Impedance
R- Leakage Current
Conversion Rate
Reference Voltage Output
Reference Load Regulation
Reference Supply Regulation
Conversion Supply Current
Average Supply Current
Standby Current
Idle Current
SERIAL INTERFACE
Input Low Voltage
Input High Voltage
Input Leakage Current
Output High Voltage
Output Low Voltage
SYMBOL
VCC
TUE
tCONV
ZIN
CONDITIONS
DOUT = 768.935 x (VREXT/VR+) - 134.0923;
VIN > 0.1VREF
VREF
ILOAD = 1mA
0 < ILOAD < 2mA
IC During conversion, no load
IA 0.5 conversions/s, no load
IS CS low, SCK inactive
IID CS high, analog circuits off
MIN TYP MAX UNITS
3.0 5.5 V
-3 +3 LSB
64 80 ms
1 M
1 50 nA
0.5 Hz
1.10 1.22 1.40
V
0 0.1 %/mA
0.7 mV/V
220 300
µA
17 29 µA
3 7 µA
10 17 µA
VIL
VIH
ILEAK
VOH
VOL
VIN = GND or VCC
ISOURCE = 1.6mA
ISINK = 1.6mA
0.8 x
VCC
VCC -
0.4
0.2 x
VCC
1
0.4
V
V
µA
V
V
2 _______________________________________________________________________________________


Part Number MAX6682
Description Thermistor-to-Digital Converter
Maker Maxim Integrated Products
Total Page 9 Pages
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