MAX6691MUB+ Maxim Integrated Products, MAX6691MUB+ Datasheet

IC TEMP-TO-PULSE WIDTH 10-UMAX

MAX6691MUB+

Manufacturer Part Number
MAX6691MUB+
Description
IC TEMP-TO-PULSE WIDTH 10-UMAX
Manufacturer
Maxim Integrated Products
Type
Temperature Sensorr
Datasheet

Specifications of MAX6691MUB+

Input Type
Logic
Output Type
Voltage
Interface
1-Wire
Current - Supply
600µA
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Full Temp Accuracy
+/- 1 C
Digital Output - Bus Interface
Serial (1-Wire)
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
(V
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
T1
). V
TOP VIEW
HVAC
Home Appliances
Medical Devices
T2
REF
T3
Typical Application Circuit
and the voltage across R
T4
________________________________________________________________ Maxim Integrated Products
T1
T2
T3
T4
R-
1
2
3
4
5
General Description
EXT
MAX6691
R
) form a voltage-divider that
EXT
Applications
10
9
8
7
6
V
R+
GND
I/O
N.C.
CC
EXT
V
CC
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
T1
T2
T3
T4
R-
TEMP RANGE
1
2
3
4
5
Ordering Information
MAX6691
MAX
Pin Configuration
10 µMAX
PIN-
PACKAGE
10
9
8
7
6
V
I/O
N.C.
GND
R+
CC
Features
CODE
U10-2
PKG
1

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MAX6691MUB+ Summary of contents

Page 1

... EXT ________________________________________________________________ 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. ♦ Simple Single-Wire Interface ♦ Measures Up to Four Thermistor Temperatures ♦ Low-Average Thermistor Current Minimizes Self- Heating Errors ♦ Internal Voltage Reference Isolates Thermistor ...

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

... 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 _____________________ 7 © 2007 Maxim Integrated Products ...

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