The MCP9808 is capable of providing temperature data with +0.5°C to +0.0625°C resolution.
The resolution can be selected using the Resolution register (Table 5-8). It is located at
address, ‘00001000’b, and it provides measurement flexibility. A +0.0625°C resolution is set as a POR
default by the factory.
Table 5-9. Temperature Conversion Time
Resolution
tCONV (ms)
Samples/sec (typical)
+0.5°C
30
33
+0.25°C
65
15
+0.125°C
130
7
+0.0625°C (Power-up Default)
250
4
Figure 5-10. Alert Output Conditions.
Notes
Alert Output Boundary Conditions
Comparator
Interrupt
Critical
TA Bits
Alert Output (Active-Low/High)
15
14
13
1
TA ≥ TLOWER
High/Low
Low/High
High/Low
0
0
0
2
TA < TLOWER – THYST
Low/High
Low/High
High/Low
0
0
1
3
TA > TUPPER
Low/High
Low/High
High/Low
0
1
0
4
TA ≤ TUPPER – THYST
High/Low
Low/High
High/Low
0
0
0
5
TA ≥ TCRIT
Low/High
Low/High
Low/High
1
1
0
6
When TA ≥ TCRIT, the Alert output is forced to Comparator mode and the CONFIG<0> (Alert Output Mode bit) is ignored until TA < TCRIT – THYST. In the Interrupt mode, if the interrupt is not cleared (bit 5 of CONFIG), as shown in the diagram at Note 6, then Alert will remain asserted at Note 7 until the interrupt is cleared by the controller.
