MCP9808
DS25095A-page 32
?2011 Microchip Technology Inc.
FIGURE 5-10:
Alert Output Conditions.
T
UPPER
T
LOWER
T
CRIT
T
A
T
UPPER
T
HYST
Comparator
Interrupt
S/w Int. Clear
Critical Only
T
CRIT
T
HYST
1
2
3
4
5
7
Notes
Alert Output Boundary
Conditions
Comparator Interrupt
Critical
T
A
Bits
Alert Output (Active-Low/High)
15
14
13
1
T
A
e T
LOWER
High/Low
Low/High
High/Low
0
0
0
2
T
A
< T
LOWER
T
HYST
Low/High
Low/High
High/Low
0
0
1
3
T
A
> T
UPPER
Low/High
Low/High
High/Low
0
1
0
4
T
A
d T
UPPER
T
HYST
High/Low
Low/High
High/Low
0
0
0
5
T
A
e T
CRIT
Low/High
Low/High
Low/High
1
1
0
6
When T
A
e T
CRIT
, the Alert output is forced to Comparator mode and the CONFIG<0> (Alert Output
Mode bit) is ignored until T
A
< T
CRIT
T
HYST
. 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.
7
T
A
< T
CRIT
T
HYST
Low/High
High/Low
High/Low
0
1
0
T
LOWER
T
HYST
T
LOWER
T
HYST
T
UPPER
T
HYST
1
3
4
2
Notes:
6
Comparator
Interrupt
S/w Int. Clear
Critical Only
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