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MAX6691MUB+T Datasheet

  • MAX6691MUB+T

  • IC TEMP-TO-PULSE WIDTH 10-UMAX

  • 120.20KB

  • 7頁

  • Maxim   Maxim

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19-2304; Rev 0; 1/02
Four-Channel Thermistor Temperature-to-Pulse-
Width Converter
General Description
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鈥?/div>
temperatures. Each of the four thermistors and an
external fixed resistor (R
EXT
) form a voltage-divider that
is driven by the MAX6691鈥檚 internal voltage reference
(V
REF
). V
REF
and the voltage across R
EXT
are mea-
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 10碌A(chǔ) (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 碌MAX package
and is specified from -55擄C to +125擄C temperature
range.
o
Simple Single-Wire Interface
o
Measures Up to Four Thermistor Temperatures
o
Low-Average Thermistor Current Minimizes Self-
Heating Errors
o
Internal Voltage Reference Isolates Thermistor
from Power-Supply Noise
o
Accommodates Any Thermistor Temperature
Range
Features
MAX6691
Ordering Information
PART
MAX6691MUB
TEMP RANGE
-55擄C to +125擄C
PIN-PACKAGE
10 碌MAX
Applications
HVAC
Home Appliances
Medical Devices
Typical Application Circuit
V
CC
Pin Configuration
TOP VIEW
TOP VIEW
T1
T2
T1
T2
T3
T4
T3
T4
R-
1
2
3
4
5
R
EXT
10
9
V
CC
I/O
N.C.
GND
R+
10k鈩?/div>
T1
1
MICRO-
CONTROLLER
10
V
CC
9
I/O
N.C.
GND
R+
T2
T3
T4
R-
2
3
4
5
MAX6691
8
7
6
MAX6691
8
7
6
碌MAX
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX6691MUB+T 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 2,500

  • 集成電路 (IC)

  • 接口 - 傳感器和探測器接口

  • -

  • 溫度傳感器

  • 邏輯

  • 電壓

  • 1 線

  • 600µA

  • 表面貼裝

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）

  • 10-µMAX

  • 帶卷 (TR)

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