Linear Technology LTC2983 - Page 20

LTC2983
20
2983fc
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Table 9A. Example Data Output Words (°C)
START ADDRESS START ADDRESS + 1 START ADDRESS + 2 START ADDRESS + 3
(END ADDRESS)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Fault Data SIGN MSB LSB
Temperature Sensor
Hard
Fault
ADC
Hard
Fault
CJ
Hard
Fault
CJ
Soft
Fault
Sensor
Over
Range
Fault
Sensor
Under
Range
Fault
ADC
Out
of
Range
Fault
Valid
If 1
4096°C
1°C 1/1024°C
8191.999°C 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1024°C 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1°C 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
1/1024°C 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
0°C 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
–1/1024°C 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
–1°C 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
–273.15°C 1 1 1 1 1 1 0 1 1 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1
Table 9B. Example Data Output Words (°F)
START ADDRESS START ADDRESS + 1 START ADDRESS + 2 START ADDRESS + 3
(END ADDRESS)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Fault Data SIGN MSB LSB
Temperature Sensor
Hard
Fault
ADC
Hard
Fault
CJ
Hard
Fault
CJ
Soft
Fault
Sensor
Over
Range
Fault
Sensor
Under
Range
Fault
ADC
Out
of
Range
Fault
Valid
If 1
4096°F
1°F 1/1024°F
8191.999°F 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1024°F 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1°F 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
1/1024°F 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
0°F 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
–1/1024°F 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
–1°F 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
–459.67°F 1 1 1 1 1 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 0 0 1 0
Table 10. Sensor Fault Reporting
BIT FAULT ERROR TYPE DESCRIPTION OUTPUT RESULT
D31 Sensor Hard Fault Hard Bad Sensor Reading –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 Sensor Reading Is Above Normal Range Suspect Reading
D26 Sensor Under Range Soft Sensor Reading Is Below Normal Range Suspect Reading
D25 ADC Out-of-Range Soft ADC Absolute Input Voltage Is Beyond ±1.125 • V
REF
/2 Suspect Reading
D24 Valid NA Result Valid (Should Be 1) Discard Results if 0 Suspect Reading
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