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参数资料
| 型号： | MAX6627MTA+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | Remote ±1°C Accurate Digital Temperature Sensors with SPI-Compatible Serial Interface |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 5.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | 3 X 3 MM, 0.8 MM HEIGHT, LEAD FREE, MO229 / WEEC, DFN-8 |
| 文件页数： | 7/9页 |
| 文件大小： | 257K |
| 代理商： | MAX6627MTA+T |
Filter high-frequency electromagnetic interference
(EMI) at DXP and DXN with an external 2200pF capaci-
tor connected between the two inputs. This capacitor
can be increased to about 3300pF (max), including
cable capacitance. A capacitance higher than 3300pF
introduces errors due to the rise time of the switched-
current source.
PCB Layout
1) Place the MAX6627/MAX6628 as close as practical
to the remote diode. In a noisy environment, such
as a computer motherboard, this distance can be
4in to 8in, or more, as long as the worst noise
sources (such as CRTs, clock generators, memory
buses, and ISA/PCI buses) are avoided.
2) Do not route the DXP/DXN lines next to the deflec-
tion coils of a CRT. Also, do not route the traces
across a fast memory bus, which can easily intro-
duce +30°C error, even with good filtering.
Otherwise, most noise sources are fairly benign.
3) Route the DXP and DXN traces parallel and close to
each other, away from any high-voltage traces such
as +12VDC. Avoid leakage currents from PCB cont-
amination. A 20M
Ω leakage path from DXP to
ground causes approximately +1°C error.
4) Connect guard traces to GND on either side of the
DXP/DXN traces (Figure 3). With guard traces in
place, routing near high-voltage traces is no longer
an issue.
5) Route as few vias and crossunders as possible to
minimize copper/solder thermocouple effects.
6) When introducing a thermocouple, make sure that
both the DXP and the DXN paths have matching
thermocouples. In general, PCB-induced thermo-
couples are not a serious problem. A copper solder
thermocouple exhibits 3V/°C, and it takes approxi-
mately 200V of voltage error at DXP/DXN to cause
a +1°C measurement error, so most parasitic ther-
mocouple errors are swamped out.
7) Use wide traces. Narrow traces are more inductive
and tend to pick up radiated noise. The 10mil
widths and spacings recommended in Figure 3 are
not absolutely necessary (as they offer only a minor
improvement in leakage and noise), but use them
where practical.
8) Placing an electrically clean copper ground plane
between the DXP/DXN traces and traces carrying
high-frequency noise signals helps reduce EMI.
Twisted Pair and Shielded Cables
For remote-sensor distances longer than 8in, or in par-
ticularly noisy environments, a twisted pair is recom-
mended. Its practical length is 6ft to 12ft (typ) before
noise becomes a problem, as tested in a noisy elec-
tronics laboratory. For longer distances, the best solu-
tion is a shielded twisted pair like that used for audio
microphones. For example, Belden #8451 works well
for distances up to 100ft in a noisy environment.
Connect the twisted pair to DXP and DXN and the
shield to ground, and leave the shield’s remote end
unterminated. Excess capacitance at DXN or DXP limits
practical remote-sensor distances (see
Typical
Operating Characteristics).
For very long cable runs, the cable’s parasitic capaci-
tance often provides noise filtering, so the recommend-
ed 2200pF capacitor can often be removed or reduced
in value. Cable resistance also affects remote-sensor
accuracy. A 1
Ω series resistance introduces about
+1/2°C error.
MAX6627/MAX6628
Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
_______________________________________________________________________________________
7
MINIMUM
10mils
GND
DXN
DXP
GND
Figure 3. Recommended DXP/DXN PC Traces
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相关代理商/技术参数 |
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| MAX6628MKA | 制造商:Maxim Integrated Products 功能描述:REMOTE +/- 1-DEGREE C ACCURATE DIGITAL TEMPER - Bulk |
| MAX6628MKA+ | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 3-WIRE/SPI 8PIN SOT-23 - Rail/Tube |
| MAX6628MKA+T | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 3-WIRE/SPI 8PIN SOT-23 - Tape and Reel |
| MAX6628MKA-T | 功能描述:板上安装温度传感器 1C Accurate Temperature Sensor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX6628MTA+ | 制造商:Maxim Integrated Products 功能描述:REMOTE ?1?C ACCURATE DIGITAL TEMPERATURE SENSORS WITH SPI - Rail/Tube |
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