Datasheet

MCP9808
DS25095A-page 32 © 2011 Microchip Technology Inc.
FIGURE 5-10: Alert Output Conditions.
T
UPPER
T
LOWER
Alert Output
T
CRIT
T
A
T
UPPER
– T
HYST
(Active-Low)
Comparator
Interrupt
S/w Int. Clear
Critical Only
T
CRIT
– T
HYST
123457
Notes
Alert Output Boundary
Conditions
Comparator Interrupt Critical T
A
Bits
Alert Output (Active-Low/High) 15 14 13
1 T
A
≥ T
LOWER
High/Low Low/High High/Low 000
2 T
A
< T
LOWER
– T
HYST
Low/High Low/High High/Low 001
3 T
A
> T
UPPER
Low/High Low/High High/Low 010
4 T
A
≤ T
UPPER
– T
HYST
High/Low Low/High High/Low 000
5 T
A
≥ T
CRIT
Low/High Low/High Low/High 110
6 When T
A
≥ 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 010
T
LOWER
– T
HYST
T
LOWER
– T
HYST
T
UPPER
– T
HYST
1342Notes: 6
Alert Output
(Active-High)
Comparator
Interrupt
S/w Int. Clear
Critical Only