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| 型号： | MAX31855SASA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC CONV THERMOCOUPLE-DGTL 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 功能： | 热电偶冷端温度补偿器 |
| 传感器类型： | 外部 |
| 感应温度： | 50°C ~ 1600°C |
| 精确度： | ±6°C（最小值） |
| 拓扑： | ADC |
| 输出类型： | 3 线/SPI? 串行 |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 其它名称： | MAX31855SASA+TDKR |
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Detailed Description
The MAX31855 is a sophisticated thermocouple-to-
digital converter with a built-in 14-bit analog-to-digital
converter (ADC). The device also contains cold-junction
compensation sensing and correction, a digital control-
ler, an SPI-compatible interface, and associated control
logic. The device is designed to work in conjunction
with an external microcontroller ( F C) in thermostatic,
process-control, or monitoring applications. The device
is available in several versions, each optimized and
trimmed for a specific thermocouple type (K, J, N, T, S,
R, or E.). The thermocouple type is indicated in the suffix
of the part number (e.g., MAX31855K). See the Ordering
Information table for all options.
Temperature Conversion
The device includes signal-conditioning hardware to
convert the thermocouple’s signal into a voltage com-
patible with the input channels of the ADC. The T+ and
T- inputs connect to internal circuitry that reduces the
introduction of noise errors from the thermocouple wires.
Before converting the thermoelectric voltages into equiv-
alent temperature values, it is necessary to compensate
for the difference between the thermocouple cold-
junction side (device ambient temperature) and a 0 N C
virtual reference. For a K-type thermocouple, the volt-
age changes by about 41 F V/ N C, which approximates
the thermocouple characteristic with the following linear
equation:
V OUT = (41.276 F V/ N C) x (T R - T AMB )
where V OUT is the thermocouple output voltage ( F V), T R
is the temperature of the remote thermocouple junction
( N C), and T AMB is the temperature of the device ( N C).
Other thermocouple types use a similar straight-line
approximation but with different gain terms. Note that the
MAX31855 assumes a linear relationship between tem-
perature and voltage. Because all thermocouples exhibit
some level of nonlinearity, apply appropriate correction
to the device’s output data.
Cold-Junction Compensation
The function of the thermocouple is to sense a difference
in temperature between two ends of the thermocouple
wires. The thermocouple’s “hot” junction can be read
across the operating temperature range ( Table 1 ). The
reference junction, or “cold” end (which should be at
Table 1. Thermocouple Wire Connections and Nominal Sensitivities
COLD-JUNCTION
TYPE
K
J
N
S
T
E
R
T- WIRE
Alumel
Constantan
Nisil
Platinum
Constantan
Constantan
Platinum
T+ WIRE
Chromel
Iron
Nicrosil
Platinum/Rhodium
Copper
Chromel
Platinum/Rhodium
TEMP RANGE ( ° C)
-270 to +1372
-210 to +1200
-270 to + 1300
+50 to +1768
-270 to +400
-270 to +1000
-50 to +1768
SENSITIVITY (μV/ ° C)
41.276
(0 N C to +1000 N C)
57.953
(0 N C to +750 N C)
36.256
(0 N C to +1000 N C)
9.587
(0 N C to +1000 N C)
52.18
(0 N C to +400 N C)
76.373
(0 N C to +1000 N C)
10.506
(0 N C to +1000 N C)
SENSITIVITY (μV/ ° C)
(0 N C TO +70 N C)
40.73
52.136
27.171
6.181
41.56
44.123
6.158
Maxim Integrated
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX31855TASA+ | 功能描述:数据转换 IC - 多种 Thermocouple To Digital Converter RoHS:否 制造商:Texas Instruments 转换器数量:1 分辨率:8 bit 工作电源电压:2.7 V to 5.5 V 功耗: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Reel |
| MAX31855TASA+T | 功能描述:数据转换 IC - 多种 Thermocouple To Digital Converter RoHS:否 制造商:Texas Instruments 转换器数量:1 分辨率:8 bit 工作电源电压:2.7 V to 5.5 V 功耗: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Reel |
| MAX3185CAP | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3185CAP+ | 功能描述:RS-232接口集成电路 EMC Cmplnt 230kbps RS-232 Serial Port RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3185CAP+T | 功能描述:RS-232接口集成电路 EMC Cmplnt 230kbps RS-232 Serial Port RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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