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參數(shù)資料
| 型號(hào)： | MAX6691MUB+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TEMP-TO-PULSE WIDTH 10-UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 溫度傳感器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 電壓 |
| 接口： | 1 線 |
| 電流 - 電源： | 600µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 管件 |
The relationship between temperature and resistance
of an NTC thermistor is highly nonlinear. However, by
connecting the thermistors in series with a properly
chosen resistor (REXT) and using the MAX6691 to mea-
sure the voltage across the resistor, a reasonably linear
transfer function can be obtained over a limited temper-
ature range. Linearity improves for smaller temperature
ranges.
Figures 3 and 4 show typical THIGH/TLOW curves for a
standard thermistor in conjunction with values of REXT
chosen to optimize linearity over two series resistors
chosen to optimize linearity over two different tempera-
ture ranges.
NTC thermistors are often described by the resistance
at +25°C. Therefore, a 10k
thermistor has a resis-
tance of 10k
at +25°C. When choosing a thermistor,
ensure that the thermistor’s minimum resistance (which
occurs at the maximum expected operating tempera-
ture) in series with REXT does not cause the voltage ref-
erence output current to exceed about 1mA. Some
standard 10k
thermistors with similar characteristics
are listed in Table 1.
Choosing REXT
Choose REXT to minimize nonlinearity errors from the
thermistor:
1) Decide on the temperature range of interest (for
example 0°C to +70°C).
2) Find the thermistor values at the limits of the tem-
perature range. RMIN is the minimum thermistor
value (at the maximum temperature) and RMAX is
the maximum thermistor value (at the minimum tem-
perature). Also find RMID, the thermistor resistance
in the middle of the temperature range (+35°C for
the 0°C to +70°C range).
3) Find REXT using the equation below:
Power-Supply Considerations
The MAX6691 accuracy is relatively unaffected by
power-supply coupled noise. In most applications,
R
RR
R
RR
R
MIN
MAX
MIN
MAX
MIN
MAX
MID
EXT
MID
=
R
+
()×
+
2
MAX6691
Four-Channel Thermistor Temperature-to-Pulse-
Width Converter
_______________________________________________________________________________________
5
Figure 2. Thermistor Resistance vs. Temperature
0
20
40
60
80
100
120
-40
0
-20
20406080
100 120
THERMISTOR RESISTANCE
vs. TEMPERATURE
TEMPERATURE (
°C)
THERMISTOR
RESISTANCE
(k
)
Figure 3. THIGH/TLOW vs. Temperature, REXT = 5110
THIGH/TLOW vs. TEMPERATURE FOR BETATHERM
10K3A1 THERMISTOR WITH REXT = 5110
TEMPERATURE (
°C)
T
HIGH
/T
LOW
120
100
80
60
40
20
0.2
0.4
0.6
0.8
1.0
1.2
0
140
Figure 4. THIGH/TLOW vs. Temperature, REXT = 7680
THIGH/TLOW vs. TEMPERATURE FOR BETATHERM
10K3A1 THERMISTOR WITH REXT = 7680
TEMPERATURE (
°C)
T
HIGH
/T
LOW
100
80
40
60
0
20
-20
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
-40
120
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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 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 |
| MAX6692EVSYS | 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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