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LTC2995 Datasheet(PDF) 28 Page - Analog Devices |
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LTC2995 Datasheet(HTML) 28 Page - Analog Devices |
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28 / 90 page  LTM2985 28 Rev. 0 For more information www.analog.com (4) Custom Thermocouple Data Pointer See Custom Thermocouples section near the end of this data sheet for more information. Fault Reporting – Thermocouple Each sensor type has a unique fault reporting mechanism indicatedintheupperbyteofthedataoutputword.Table 19 shows faults reported in the measurement of thermo- couples. BitD31indicatesthethermocouplesensorisopen(broken or not plugged in), the cold junction sensor has a hard fault, or the ADC is out of range. This is indicated by a reading well beyond the normal operating range. Bit D30 indicates a bad ADC reading. This can be a result of either a broken (open) sensor or an excessive noise event (ESD or static discharge into the sensor path). Either of these APPLICATIONS INFORMATION Table 19. Thermocouple Fault Reporting BIT FAULT ERROR TYPE DESCRIPTION OUTPUT RESULT D31 Sensor Hard Fault Hard Open Circuit or Hard ADC or Hard CJ –999°C or °F D30 Hard ADC-Out-of-Range Hard Bad ADC Reading (Could Be Large External Noise Event) –999°C or °F D29 CJ Hard Fault Hard Cold Junction Sensor Has a Hard Fault Error –999°C or °F D28 CJ Soft Fault Soft Cold Junction Sensor Result Is Beyond Normal Range Suspect Reading D27 Sensor Over Range Soft Thermocouple Reading Greater Than High Limit Suspect Reading D26 Sensor Under Range Soft Thermocouple Reading Less Than Low Limit Suspect Reading D25 ADC Out-of-Range Soft ADC Absolute Input Voltage Is Beyond ±1.125 • VREF/2 Suspect Reading D24 Valid NA Result Valid (Should Be 1) Discard Results if 0 Valid Reading are a hard error and –999°C or °F is reported. In the case of an excessive noise event, the device should recover and the following conversions will be valid if the noise event was a random, infrequent event. Bit D29 indicates a hard fault occurred at the cold junction sensor and –999°C or °F is reported. Refer to the specific sensor (diode, themistor, or RTD) used for cold junction compensation. Bit D28 indicates a soft fault occurred at the cold junction sensor. A valid temperature is reported, but the accuracy may be compromised since the cold junction sensor is operating outside its normal temperature range. Bits D27 and D26 indicate over or under temperature limits have been exceeded for specific thermocouple types, as defined in Table 20. Bit D25 indicates the absolute voltage measuredbytheADCisbeyonditsnormaloperatingrange. This fault reflects a reading that is well beyond the normal range of a thermocouple. Table 20. Thermocouple Temperature Limits THERMOCOUPLE TYPE LOW TEMP LIMIT °C HIGH TEMP LIMIT °C J-Type –210 1200 K-Type –265 1372 E-Type –265 1000 N-Type –265 1300 R-type –50 1768 S-Type –50 1768 T-Type –265 400 B-Type 40 1820 Custom Lowest Table Entry Highest Table Entry |
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