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參數(shù)資料
| 型號(hào)： | MAX6691 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 熱敏電阻 |
| 英文描述： | Four-Channel Thermistor Temperature-to-Pulse- Width Converter |
| 中文描述： | 四通道、熱敏電阻溫度至脈寬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 151K |
| 代理商： | MAX6691 |
M
bypass V
CC
to GND by placing a 0.1μF to 1.0μF
ceramic bypass capacitor close to the supply pin of the
devices.
Thermal Considerations
Self-heating degrades the temperature measurement
accuracy of thermistors. The amount of self-heating
depends on the power dissipated and the dissipation
constant of the thermistor. Dissipation constants
depend on the thermistor
’
s package and can vary con-
siderably.
A typical thermistor might have a dissipation constant
equal to 1mW/
°
C. For every milliwatt the thermistor dis-
sipates, its temperature rises by 1
°
C. For example, con-
sider a 10k
(at +25
°
C) NTC thermistor in series with a
5110
resistor operating +40
°
C with a constant 5V
bias. If it is one of the standard thermistors previously
mentioned, its resistance is 5325
at this temperature.
The power dissipated in the thermistor is:
(5V)
2
(5325
) / (5325
+ 5110
)
2
= 1.22mW
This thermistor therefore has a self-heating error at
+40
°
C of 1.22
°
C. Because the MAX6691 uses a small
reference voltage and energizes each thermistor for
only about 25ms per conversion cycle, the self-heating
of the thermistor under the same conditions when used
with the MAX6691 is far less. Assuming one conversion
cycle every 5s, each thermistor is energized only 0.5%
of the time:
(1.22)
2
(5325)(0.005) / (5325 + 5110)
2
= 0.364μW, or
only about 0.00036
°
C self-heating error.
Chip Information
TRANSISTOR COUNT: 7621
PROCESS: BiCMOS
Four-Channel Thermistor Temperature-to-Pulse-
Width Converter
6
_______________________________________________________________________________________
Table 1. Standard Thermistors
MANUFACTURER
Betatherm
Dale
Thermometrics
PART
10K3A1
1M1002
C100Y103J
WEBSITE
www.betatherm.com/indexna.htm
www.vishay.com/brands/dale/main.html
www.thermometrics.com
T1
T2
T3
T4
REFERENCE
VOLTAGE-TO-PWM
CONVERTER
R-
R+
I/O
MAX6691
Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6691MUB | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 分辨率:8 bit 工作電源電壓:2.7 V to 5.5 V 功耗: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Reel |
| MAX6691MUB+ | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 4Ch Thermistor Temp to-Pulse-Width RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 分辨率:8 bit 工作電源電壓:2.7 V to 5.5 V 功耗: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Reel |
| MAX6691MUB+T | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 4Ch Thermistor Temp to-Pulse-Width RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 分辨率:8 bit 工作電源電壓:2.7 V to 5.5 V 功耗: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Reel |
| MAX6691MUB-T | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 分辨率:8 bit 工作電源電壓:2.7 V to 5.5 V 功耗: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Reel |
| MAX6692EVKIT | 功能描述:板上安裝溫度傳感器 Evaluation System/Evaluation Kit for the MAX6648 MAX6649 MAX6692 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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