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參數(shù)資料
| 型號： | MAX6674ISA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC THERMOCOUP TO DGTL 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 溫度傳感器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | 3 線 SPI 串行 |
| 電流 - 電源： | 2mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
MAX6674
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +128°C)
_______________________________________________________________________________________
5
Applications Information
Serial Interface
The Typical Application Circuit shows the MAX6674
interfaced with a microcontroller. In this example, the
MAX6674 processes the reading from the thermocou-
ple and transmits the data through a serial interface.
Force CS low and apply a clock signal at SCK to read
the results at S0. Forcing CS low immediately stops any
conversion process. Initiate a new conversion process
by forcing CS high.
Force CS low to output the first bit on the S0 pin. A
complete serial interface read requires 16 clock cycles.
Read the 16 output bits on the falling edge of the clock.
The first bit, D15, is a dummy sign bit and always zero.
Bits D14–D5 contain the converted temperature in the
order of MSB to LSB. Bit D4 reads a high value when
any of the thermocouple inputs are open. Bit D3 is
always low to provide a device ID for the MAX6674.
Bits D2–D0 are in three-state when CS is high.
Figure 1a is the serial interface protocol and Figure 1b
shows the serial interface timing. Figure 2 is the S0 output.
Open Thermocouple
Bit D4 is normally low and goes high if the thermocou-
ple input is open. The open thermocouple detection cir-
cuit is implemented completely into the MAX6674. In
order to allow the operation of the open thermocouple
detector, T- must be grounded. Make the ground con-
nection as close to the GND pin as possible.
Noise Considerations
The accuracy of the MAX6674 is susceptible to power-
supply coupled noise. The effects of power-supply
noise can be minimized by placing a 0.1F ceramic
bypass capacitor close to the supply pin of the device.
Thermal Considerations
Self-heating degrades the temperature measurement
accuracy of the MAX6674 in some applications. The
magnitude of the temperature errors depends on the
thermal conductivity of the MAX6674 package, the
mounting technique, and the effects of airflow. Use a
large ground plane to improve the temperature mea-
surement accuracy.
The accuracy of a thermocouple system can also be
improved by following these precautions:
Use the largest wire possible that does not shunt
heat away from the measurement area.
If small wire is required, use it only in the region of
the measurement and use extension wire for the
region with no temperature gradient.
Avoid mechanical stress and vibration that could
strain the wires.
When using long thermocouple wires, use a twist-
ed-pair extension wire.
Avoid steep temperature gradients.
Try to use the thermocouple wire well within its tem-
perature rating.
Use the proper sheathing material in hostile envi-
ronments to protect the thermocouple wire.
Use extension wire only at low temperatures and
only in regions of small gradients.
Keep an event log and a continuous record of ther-
mocouple resistance.
Reducing Effects of Pick-Up Noise
The input amplifier (A1) is a low-noise amplifier
designed to enable high-precision input sensing. Keep
the thermocouple and connecting wires away from
electrical noise sources.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6675EVKIT | 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 |
| MAX6675ISA | 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 |
| MAX6675ISA+ | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 K Thermocouple 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 |
| MAX6675ISA+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| MAX6675ISA+T | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC - 多種 K Thermocouple 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 |
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