ADT7467 Analog Devices, Inc., ADT7467 Datasheet - Page 66

• Manufacturer Part Number: ADT7467
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7467
Table 28. Register 0x42—Interrupt Status Register 2 (Power-On Default = 0x00)
Bit
<1>
<2>
<3>
<4>
<5>
<6>
<7>
Table 29. Voltage Limit Registers
Register Address
0x46
0x47
0x48
0x49
1
2
Table 30. Temperature Limit Registers
Register Address
0x4E
0x4F
0x50
0x51
0x52
0x53
1
2
Table 31. Fan Tachometer Limit Registers
Register Address
0x54
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
1
Setting the Configuration Register 1 lock bit has no effect on these registers.
High limit: An interrupt is generated when a value exceeds its high limit (>comparison). Low limit: An interrupt is generated when a value is equal to or below its low
limit (≤comparison).
Exceeding any temperature limit by 1°C sets the appropriate status bit in the interrupt status register. Setting the Configuration Register 1 lock bit has no effect on
these registers.
High limit: An interrupt is generated when a value exceeds its high limit (>comparison). Low limit: An interrupt is generated when a value is equal to or below its low
limit (≤comparison).
Exceeding any TACH limit register by 1 indicates that the fan is running too slowly or has stalled. The appropriate status bit is set in Interrupt Status Register 2 to
indicate the fan failure. Setting the Configuration Register 1 lock bit has no effect on these registers.
Name
OVT
FAN1
FAN2
FAN3
F4P
D1
D2
R/W
Read only
Read only
Read only
Read only
Read only
Read/write
Read only
Read only
Read only
Description
OVT = 1 indicates that one of the THERM overtemperature limits has been exceeded. This bit is cleared upon
a read of the status register when the temperature drops below THERM –T
FAN1 = 1 indicates that Fan 1 has dropped below minimum speed or has stalled. This bit is not set when the
PWM1 output is off.
FAN2 = 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This bit is not set when the
PWM2 output is off.
FAN3 = 1 indicates that Fan 3 has dropped below minimum speed or has stalled. This bit is not set when the
PWM3 output is off.
F4P = 1 indicates that Fan 4 has dropped below minimum speed or has stalled. This bit is not set when the
PWM3 output is off.
When Pin 9 is programmed as a GPIO output, writing to this bit determines the logic output of the GPIO.
If Pin 9 is configured as the THERM timer input for THERM monitoring, then this bit is set when the THERM
assertion time exceeds the limit programmed in the THERM limit register (Reg. 0x7A).
D1 = 1 indicates either an open or short circuit on the Thermal Diode 1 inputs.
D2 = 1 indicates either an open or short circuit on the Thermal Diode 2 inputs.
R/W
Read/write
Read/write
Read/write
Read/write
R/W
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
R/W
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
1
1
1
Description
V
V
V
V
Description
Remote 1 temperature low limit.
Local temperature low limit.
Local temperature high limit.
Remote 2 temperature high limit.
Description
TACH1 minimum low byte.
TACH1 minimum high byte/single channel ADC
channel select.
TACH2 minimum low byte.
TACH2 minimum high byte.
TACH3 minimum low byte.
TACH3 minimum high byte.
TACH4 minimum low byte.
TACH4 minimum high byte.
Remote 1 temperature high limit.
Remote 2 temperature low limit.
CCP
CCP
CC
CC
low limit.
high limit.
low limit.
high limit.
Rev. A | Page 66 of 80
2
2
HYST
0x81
Power-On Default
0xFF
0xFF
0xFF
0xFF
Power-On Default
0x00
0xFF
0x00
0xFF
Power-On Default
0x81
0x7F
0x7F
0x81
0x7F
0xFF
0xFF
0xFF
0xFF
.