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| 型號： | LM81 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Serial Interface ACPI-Compatible Microprocessor System |
| 中文描述： | 串行接口ACPI的兼容微處理器系統(tǒng) |
| 文件頁數(shù)： | 19/32頁 |
| 文件大小： | 412K |
| 代理商： | LM81 |
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Functional Description
(Continued)
8.2 Temperature Interrupts
INT and T_CRIT_A outputs are provided for temperature in-
terrupt. Temperature interrupts have a normal and an ex-
tended option of operation. Each option has three different
modes of operation: Repetitive Interrupt, One-Time Interrupt
and Comparator.
Normal Repetitive Interrupt Mode
is shown in Figure 11
and operates in the following way: T_CRIT_A is disabled.
Exceeding T
causes an interrupt that will remain active
indefinitely until reset by reading Interrupt Status Register 1.
Once reset if the temperature remains above the T
setpoint the interrupt will again be activated at the comple-
tion of another conversion cycle. If temperature is less than
or equal to T
HIHYST
the interrupt will not be activated.
Normal One-Time Interrupt Mode
is shown in Figure 12
and operates in the following way: T_CRIT_A is disabled.
Exceeding T
causes an interrupt that will remain active
indefinitely until reset by reading Interrupt Status Register 1.
Another interrupt will not occur until the temperature drops to
less than or equal to T
and then exceeds T
during
a subsequent conversion. After power up this mode is se-
lected as default.
Normal Comparator Mode
is shown in Figure 13 and oper-
ates in the following way: T_CRIT_A is disabled. Exceeding
T
causes an interrupt that will remain activated until the
temperature is less than or equal to T
HIGH
. T
LOW
is disabled.
DS100072-16
*
Note:
Interrupt resets occur only when interrupt Status Register 1 is read.
FIGURE 11. Normal Repetitive Interrupt Response
Diagram
DS100072-17
*
Note:
Interrupt resets occur only when interrupt Status Register 1 is read.
FIGURE 12. One-Time Interrupt Response Diagram
DS100072-18
*
Note:
Interrupt resets occur only when interrupt Status Register 1 is read.
FIGURE 13. Normal Comparator Mode
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