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參數(shù)資料
| 型號(hào)： | MAX6682MUA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大小： | 0K |
| 描述： | IC THERMISTOR TO DGTL 8UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類(lèi)型： | 溫度傳感器 |
| 輸入類(lèi)型： | 邏輯 |
| 輸出類(lèi)型： | 邏輯 |
| 接口： | 3 線 SPI 串行 |
| 電流 - 電源： | 29µA |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1426 (CN2011-ZH PDF) |
MAX6682
Detailed Description
The MAX6682 is a sophisticated interface circuit that
energizes a low-cost thermistor and converts its tem-
perature-dependent resistance to 10-bit digital data.
The MAX6682 powers the thermistor only when a mea-
surement is being made; the power dissipated in the
thermistor is minimized. This virtually eliminates self-
heating, a major component of thermistor error. The
simple serial interface is compatible with common
microcontrollers.
Temperature Conversion
The MAX6682 converts the voltage drop across the
resistor REXT to a digital output using an internal 10-bit
ADC. By measuring the voltage across REXT, the output
code is directly related to temperature when using an
NTC thermistor.
Although the relationship between a thermistor’s resis-
tance and its temperature is very nonlinear, the voltage
across REXT is reasonably linear over a limited temper-
ature range, provided that REXT is chosen properly. For
example, over a +10°C to +40°C range, the relationship
between the voltage across REXT and temperature is
linear to within approximately 0.2°C. Wider temperature
ranges result in larger errors.
The digital output is available as a 10-bit + sign word.
The relationship between the 11-bit digital word and the
voltage across REXT (normalized to VR+) is given by:
where VREXT/VR+ is the voltage across REXT normal-
ized to the value of VR+.
Table 1 shows the relationship between the voltage
across REXT and the MAX6682’s digital output code. It
also shows the temperature that would produce the list-
ed value of VREXT when a standard thermistor is used
in conjunction with REXT = 7680
. The MAX6682 pro-
duces output codes scaled to the actual temperature
when used with the standard thermistor and REXT =
7680
over the +10°C to +40°C temperature range.
Under these conditions, the nominal accuracy is about
0.2°C between +10° and +40°C, and about 1.5°C from
0°C to +50°C. In Table 1, the 3LSBs of the output code
represent fractional temperatures. The LSB has a value
of 0.125°C.
All table entries assume no errors in the values of REXT
or the thermistor resistance. Table 1 also assumes the
use of one of the following standard thermistors:
Betatherm 10K3A1, Dale 1M1002, or Thermometrics
C100Y103J. These thermistors have a nominal resis-
tance of 10k
at +25°C and very similar temperature-
to-resistance functions. They give the results shown in
Table 1.
Different temperature ranges can be accommodated as
well using different values of REXT (see Choosing the
External Resistor). The MAX6682 works with thermistors
other than the ones listed above, but the transfer func-
tions vary somewhat.
Applications Information
Thermistors and Thermistor Selection
NTC thermistors are resistive temperature sensors
whose resistance decreases with increasing tempera-
ture. They are available in a wide variety of packages
that are useful in difficult applications such as measure-
ment of air or liquid temperature. Some can operate
over temperature ranges beyond that of most ICs. The
relationship between temperature and resistance in an
D
V
OUT
REXT
R
=
×
+
0 174387
8
0 010404
.
Thermistor-to-Digital Converter
4
_______________________________________________________________________________________
PIN
NAME
FUNCTION
1
I.C.
Internally Connected. Connect to GND or leave unconnected.
2
R+
Reference Voltage Output. External resistor positive input.
3R-
External Resistor Negative Input. Connect R- to the junction of the external resistor and the
thermistor.
4
GND
Ground. Ground connection for MAX6682 and ground return for external thermistor.
5
CS
Chip Select. Drive CS low to enable the serial interface.
6
SO
Serial Data Output
7
SCK
Serial Clock Input
8VCC
Positive Supply. Bypass VCC to GND with a 0.1F capacitor.
Pin Description
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6682MUA+ | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 Thermistor to Digital Converter 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 |
| MAX6682MUA+T | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 Thermistor to Digital Converter 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 |
| MAX6682MUA-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 |
| MAX6683AUB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類(lèi)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 |
| MAX6683AUB+ | 功能描述:板上安裝溫度傳感器 Temperature Sensor & System Monitor RoHS:否 制造商:Omron Electronics 輸出類(lèi)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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