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Data Sheet ADT7470
Rev. E | Page 31 of 40
Table 32. Register 0x41. Interrupt Status Register 1 (Power-On Default = 0x00).
Bit Name Read/Write Description
[0] R1T Read-only A 1 indicates that the Remote 1 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[1] R2T Read-only A 1 indicates that the Remote 2 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[2] R3T Read-only A 1 indicates that the Remote 3 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[3] R4T Read-only A 1 indicates that the Remote 4 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[4] R5T Read-only A 1 indicates that the Remote 5 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[5] R6T Read-only A 1 indicates that the Remote 6 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[6] R7T Read-only A 1 indicates that the Remote 7 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[7] OOL Read-only A 1 indicates that an out-of-limit event has been latched in Status Register 2. This bit is a
logical OR of all status bits in Status Register 2. Software can test this bit in isolation to
determine whether any of the temperature or fan speed readings represented by Status
Register 2 are out of limit. This saves the need to read Status Register 2 every interrupt or
polling cycle.
Table 33. Register 0x42. Interrupt Status Register 2 (Power-On Default = 0x00).
Bit Name Read/Write Description
[0] R8T Read-only A 1 indicates that the Remote 8 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[1] R9T
Read-only
A 1 indicates that the Remote 9 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[2] R10T Read-only A 1 indicates that the Remote 10 temperature high or low limit has been exceeded.
This bit is cleared on a read of the status register only if the error condition has subsided.
[3] NORM Read-only A 1 indicates that the measured temperatures are normal (below T
MIN
), and the fans should
be off.
[4] Fan 1 Read-only A 1 indicates that Fan 1 has gone above max speed or dropped below min speed.
[5] Fan 2 Read-only A 1 indicates that Fan 2 has gone above max speed or dropped below min speed.
[6] Fan 3 Read-only A 1 indicates that Fan 3 has gone above max speed or dropped below min speed.
[7] Fan 4 Read-only A 1 indicates that Fan 4 has gone above max speed or dropped below min speed.