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MAX31855KASA
SOIC-8 (150mil)
The MAX31855KASA from Maxim Integrated (now ADI) is a K-type thermocouple-to-digital converter with 14-bit resolution and cold-junction compensation in SOIC-8 for temperature measurement.
| الحزمة | SOIC-8 (150mil) |
The MAX31855KASA from Maxim Integrated (now ADI) is a K-type thermocouple-to-digital converter with 14-bit resolution and cold-junction compensation in SOIC-8 for temperature measurement.
The MAX31855KASA is a K-type thermocouple-to-digital converter from Maxim Integrated in SOIC-8, providing a 14-bit signed thermocouple temperature reading and a 12-bit internal cold-junction compensation (CJC) temperature. The device performs two measurements simultaneously: (1) The thermocouple voltage (the Seebeck voltage generated by the temperature difference between the hot junction and the cold junction) is amplified and digitized by a delta-sigma ADC to 14-bit resolution (0.25C per LSB), covering -270C to +1800C with +/-2C accuracy from -200C to +700C; (2) The internal die temperature (cold junction) is measured by an on-chip diode sensor to 12-bit resolution (0.0625C per LSB), covering -55C to +125C with +/-3C accuracy. The SPI interface outputs a 32-bit data frame: bits D31-D18 contain the thermocouple temperature, D15-D4 contain the cold-junction temperature, and D0-D2 contain fault flags (open thermocouple, short to GND, short to VCC). The cold-junction compensation is performed by the host: the actual hot-junction temperature = thermocouple reading + CJC reading (since the thermocouple voltage only represents the temperature difference). The device automatically detects open thermocouple (broken wire) and sets the D16 fault bit. The input impedance on T+/T- is 1M-ohm minimum, compatible with ungrounded thermocouple probes. The conversion time is 100ms (both channels), and the SPI frame is updated continuously while CS is HIGH. The -KASA suffix specifies K-type, SOIC-8. Applications include: industrial temperature monitoring, 3D printer hotend control, and oven temperature measurement.
| دبوس | الاسم | النوع | الوظيفة |
|---|---|---|---|
| 1 | GND | الطاقة | أرضي |
| 2 | T- | التناظرية | Thermocouple negative input (connects to K-type thermocouple negative wire) |
| 3 | T+ | التناظرية | Thermocouple positive input (connects to K-type thermocouple positive wire) |
| 4 | VCC | الطاقة | Supply (3.0-3.6V, typical 3.3V) |
| 5 | SCK | المدخلات | SPI clock (up to 5MHz, shifts out 32-bit data frame) |
| 6 | CS | المدخلات | Chip select (active LOW, LOW=shift out data, HIGH=begin new conversion) |
| 7 | SO | المخرجات | SPI data output (14-bit thermocouple + 12-bit cold junction data) |
| 8 | نورث كارولاينا | - | No connect |
| الشركة المصنعة | رقم الجزء | الحزمة | الملاحظات |
|---|---|---|---|
| مكسيم | MAX31855KASA | SOIC-8 | Same device, Maxim brand |
| مكسيم | MAX31855JASA | SOIC-8 | J-type thermocouple version |
| مكسيم | MAX31855TASA | SOIC-8 | T-type thermocouple version |
| مكسيم | MAX31856MUD+ | TSSOP-14 | Universal thermocouple, SPI, cold junction, fault detect |
| تكساس إنسترومنتس | TMP6131DYAR | VSSOP-8 | Thermocouple AFE, 24-bit, TI brand |
العلامة التجارية:
الحزمة:
دورة الشحن 3 ~ 7 أيام
الحد الأدنى للطلب هو 1
العلامة التجارية:
الحزمة:
دورة الشحن 3 ~ 7 أيام
الحد الأدنى للطلب هو 1
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