ADT7476 Analog Devices, Inc., ADT7476 Datasheet - Page 59

• Manufacturer Part Number: ADT7476
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

Table 28. Register 0x42—Interrupt Status Register 2 (Power-On Default = 0x00)
Bit
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Table 29. Register 0x43—VID Code Register (Power-On Default = 0x1F )
Bit
[4:0]
[5]
[6]
[7]
Name
12 V/VC
OVT
FAN1
FAN2
FAN3
F4P
THERM
GPIO6
D1
D2
Name
VID[4:0]/
GPIO
VID5
THLD
VIDSEL
R/W
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
R/W
Read-only
Read-only
R/W
Read-only
Read-only
R/W
R/W
Description
A 1 indicates that the 12 V 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. If Pin 21 is configured as VID5, this bit is the VID change
bit. This bit is set when the levels on VID0 to VID5 are different than they were 11 μs previously. This pin
can be used to generate an SMBALERT whenever the VID code changes.
OVT = 1 indicates that one of the THERM overtemperature limits has been exceeded. This bit is cleared on
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 PWM 1 output is off.
FAN2 = 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This bit is not set when
the PWM 2 output is off.
FAN3 = 1 indicates that Fan 3 has dropped below minimum speed or has stalled. This bit is not set when
the PWM 3 output is off.
When Pin 14 is programmed as a TACH4 input, 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.
If Pin 14 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 (0x7A).
When Pin 14 is programmed as the GPIO6 output, writing to this bit determines the logic output of GPIO6.
When GPIO6 is programmed as an input, this bit reflects the value read by GPIO6.
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.
Description
The VID inputs from the CPU indicate the expected processor core voltage. On power-up, these bits
reflect the state of the VID pins, even if monitoring is not enabled.
When enabled as a GPIO, these bits are writable.
Reads VID5 from the CPU when Bit 7 = 1. If Bit 7 = 0, the VID5 bit always reads back 0 (power-on default).
Selects the input switching threshold for the VID inputs.
THLD = 0 selects a threshold of 1 V (V
THLD = 1 lowers the switching threshold to 0.6 V (V
VIDSEL = 0 configures Pin 21 as the 12 V measurement input (default).
Rev. B | Page 59 of 72
OL
< 0.8 V, V
IH
> 1.7 V).
OL
< 0.4 V, V
IH
> 0.8 V).
HYST
.
ADT7476